Glendora City Council
June 9, 2026

Although the compliance period has not yet started, CWC Section 10631 (d)(3)(C) requires water suppliers to provide data in the UWMP to show whether the supplier met its State Board water loss performance standard.

Over the last five years, the City’s water losses have ranged from 10% to 19% when calculated as the difference between billed consumption and total production. To project the water loss component of future demands, the City assumed future water losses will be approximately 14% of total customer water use. Calculated water losses are shown in Table 2-4.

Based on data released by the State on January 30, 2026, the supplier’s baseline for real water loss is

52.8 gpscd and the real water loss standard is 20.3 gpscd, and the apparent loss standard is the baseline of 13.3 gpscd. No reduction from the baseline is required to meet the water loss standard by 2028. As 2025 Urban Water Management Plan: Individual Chapter
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shown in Table 2-5, based on the most recent water loss audit from 2024, the City has not yet met the real water loss performance standard, but is working toward that goal by 2028. Section 8.1.5 discusses City’s programs to assess and manage distribution system real loss. 2025 Urban Water Management Plan: Individual Chapter
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Table 2-4. Calculated Water Loss
Water Loss 2021 2022 2023 2024 2025
Calculated Water Loss 2,140 1,032 1,462 966 1,243
% Water Loss 19% 10% 18% 11% 12%
Table 2-5. DWR 4-6R Progress Towards 2028 Water Loss Standard Public System
ID # Reported
in Submittal
Table 2-1R
Did the
Water
Board
Calculate a
Water
Loss
Standard
for this
Public
System?
2028 Real
Water
Loss
Standard
per Unit
per day
Units for
Real
Water
Loss
Standard
Number of
Units
Volume of
Total Real
Water
Loss (from
AWWA
Water
Loss
Audit)
2025 or
Most
Recent
Year Real
Water
Loss per
Unit per
Day
2028
Apparent
Water Loss
Standard
per Unit
per Day
Units for
Apparent
Water
Loss
Number of
Connections
Volume of
Total
Apparent
Loss (from
AWWA
Water
Loss
Audit)
2025 or
Most
Recent
Year
Apparent
Water Loss
per Unit
per Day
CA1910044 Yes 20.3 gpscd 13,816 1,660 107.3 13.3 gpscd 13,816 121 7.8 2025 Urban Water Management Plan: Individual Chapter
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2.2. Projected Water Use
The “Making Conservation a California Way of Life” Regulation (CWOL Regulation) establishes unique water budget-based Urban Water Use Objectives (UWUO) for each urban retail water supplier in the State. The CWOL Regulation requires suppliers to calculate an annual UWUO consisting of these core components:

UWUO = Residential Indoor Water Use Budget + Residential Outdoor Water Use Budget + Commercial, Industrial, and Institutional (CII) Dedicated Irrigation Meters (DIM) Outdoor Water Use Budget + Real Water Loss Budget
DWR and the State Board have developed an annual reporting framework, tools, and guidance for calculating the UWUO and comparing it to the actual use for that year. The State Board’s “Water Use Objective Exploration Tool” allows users to enter varying efficiency standards and baseline year(s) of input data to calculate and visualize a comparison of historic demand to the UWUO with selected standards. The State Board’s “Annual UWUO and Water Use Report” tool pre-populates input data and standards for the given reporting year. To project demands for this UWMP, a demand tool that aligns with the framework, data, and calculations of the State Board’s tools was used and updated to allow for forecasting future years’ water demand considering future efficiency standards, supplier input data, and growth assumptions. Depending on the annual fluctuations of input data, a supplier’s estimated UWUO reduction needed by 2040 can exceed 30% relative to the baseline usage. According to the CWOL Regulation, suppliers who must achieve over a 30% reduction in their 2040 UWUO compared to baseline usage are permitted to follow an alternative compliance method. This alternative method requires an annual decrease of 2% in gallons per capita per day (GPCD) compared to the baseline usage.

Based on the demand analysis for this UWMP, the City anticipates a reduction of more than 40% will be needed to meet the UWUO. While City intends to meet the UWUO, it was also considered that demands may continue in alignment with historic patterns initially and take more time than anticipated to reach direct alignment with the UWUO. Therefore, demands used for the purposes of supply reliability planning in this UWMP are assumed to reduce by 2% per five-year planning period from 2025, which is 198 GPCD. This results in 194 GPCD in 2030, declining by approximately 2% each subsequent five-year period until it reaching approximately 179 GPCD in 2050. Population projections as described in Section

1.1.1 are applied to these GPCD values to project future demands, as shown in Figure 2-1. The assumed future water loss of 14% described in the previous section was applied to the subtotal of demand for all connection types to estimate future water losses. Table 2-6 presents the projected demand by customer type through 2050 for this UWMP.
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Figure 2-1. Historical and Projected Demands
Table 2-6. DWR 4-2R Projected Demands for Water Use, AFY Use Type Additional
Description
Level of
Treatment
When
Delivered
Projected
Water
Use 2030
Projected
Water
Use 2035
Projected
Water
Use 2040
Projected
Water
Use 2045
Projected
Water
Use 2050
Single Family Potable 6,618 6,535 6,415 6,296 6,180
Multi-Family Potable 587 580 569 559 548
Commercial Potable 1,185 1,170 1,148 1,127 1,107
Landscape Potable 161 159 156 153 151
Sales to other
agencies
Potable 47 46 45 45 44
Distribution
System Water
Loss
Potable 1,405 1,388 1,362 1,337 1,312
Total 10,004 9,878 9,696 9,517 9,342
Table 2-6 and Table 2-7 satisfy the requirement to include anticipated water conservation savings when developing future demand projections since they account for water efficiency standards set by the State for the UWUO and an alternative compliance path to reduce by 2% per five-year planning period from 2025. Conservation savings were considered and included in developing demand estimates for the next 25 years. However, the City considers projected demand to plan for supply reliability if demands continue in alignment with historic patterns rather than in direct alignment with the UWUO. The City is complying with and planning for UWUO standards as described in Sections 3 and 8. 2025 Urban Water Management Plan: Individual Chapter
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Senate Bill 1087 requires that water use projections in an UWMP include projected water use associated with single family and multi-family residential housing for lower income households, as identified in the housing elements of any city, county, or city and county within the supplier’s service area. The Regional Housing Needs Assessment (RHNA) establishes housing needs for each jurisdiction over the applicable planning period. SCAG adopted the 6th Cycle RHNA Allocation Plan, which covers the planning period from October 2021 through October 2029 (SCAG, March 2021). SCAG’s population and household projections inform the RHNA Allocation Plan and are used in the determination and allocation of housing needs, including lower income housing, for individual jurisdictions. The growth projections in this UWMP are based on SCAG projections for the service area and therefore also incorporate the lower income housing projections. The projected demands in this UWMP represent water use from all future growth and are inclusive of water use for lower income households.

Table 2-7. DWR 4-3R Inclusion in Water Use Projections
Question Yes or No
Are Future Water Savings Included in Projections? Yes
Are Lower Income Residential Demands Included in Projections? Yes

2.3. Climate Change Considerations
A topic of growing concern for water planners and managers is climate change and the potential impacts it could have on California’s future water supplies. A recent Climate Change Vulnerability Assessment utilizing data from DWR and 20 global climate models suggests that a changing climate will have multiple effects on the Region. Adaptation and mitigation measures will be necessary to account for these effects.

Part 1, Chapter 2 of the 2025 RUWMP includes an assessment of the potential impacts of climate change.
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3. SB X7-7 Compliance & Future Water Use Efficiency
Requirements
This section describes compliance with the Water Conservation Act of 2009, also known as Senate Bill 7 of Special Extended Session 7 (SBX7-7). The section demonstrates compliance with the 2020 SBX7-7 target and discusses future water use efficiency requirements.

3.1. Compliance and Future Water Use Efficiency Requirements SBX7-7 was incorporated into the UWMP Act in 2009 and required that all water suppliers increase water use efficiency with the overall goal to decrease per-capita water consumption within the state by 20% by the year 2020.

SBX7-7 required DWR to develop certain criteria, methods, and standard reporting forms through a public process that water suppliers could use to establish their baseline water use and determine their water conservation targets. SBX7-7 and DWR's Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Use (DWR, March 2021) specify methodologies for determining the baseline water demand, 2015 interim urban water use target and the 2020 urban water use target for the City as described in the 2020 UWMP. This section also demonstrates that the City achieved its 2020 water use target.

Table 3-1 below establishes the City’s 2020 actual and 2020 target GPCD. As shown, the City met its 2020 target. Most recently, in 2025, the water use was 198 GPCD, which is well below the 2020 target of 218 GPCD.

Table 3-1. SB X7-7 2020 Target Progress
2020 Target GPCD 2020 Actual GPCD Did Supplier Achieve Target? 218 194 Yes
New water use efficiency standards from the CWOL Regulation supersede SBX7-7 standards. In 2018, two policy bills were enacted by the California Legislature, Assembly Bill 1668 (AB1668, Friedman) and Senate Bill 606 (SB606, Hertzberg), collectively referred to as the “2018 Water Conservation Legislation.” Based on the 2018 Water Conservation Legislation, related legislation, and subsequent adoption of the CWOL Regulation, each urban retail water supplier must comply with its UWUO. DWR and the State Board have developed a reporting framework for calculating the UWUO and compliance annually with efficiency standards becoming increasingly stringent through 2040.

The demand projections in this UWMP are based on the City meeting its estimated future UWUO, as described in Section 2.2 in order to plan and implement necessary demand management measures (DMMs) (described in Section 8) to support meeting the UWUO. DMMs and UWUO compliance planning enhance resiliency for drought and other water shortage conditions as described in Sections 5, 7, and 8. 2025 Urban Water Management Plan: Individual Chapter
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4. Water Supply
The City’s primary sources for water supply include treated imported surface water purchased from the MWD through TVMWD, groundwater pumped from the Main San Gabriel Basin (Main Basin), and local treated surface water purchased from CVWC. More information about local surface water and groundwater basins is included in Part 1 Chapter 3 of the 2025 RUWMP.

4.1. Purchased or Imported Water

4.1.1. Three Valleys Municipal Water District
The City purchases treated imported water from MWD through TVMWD. MWD imports water from the Colorado River through the Colorado River Aqueduct (CRA), owned and operated by MWD, and the State Water Project (SWP), which utilizes the California Aqueduct for transmission to Southern California.

TVMWD’s member agencies can receive treated imported water from MWD’s Weymouth Treatment Plant located in the City of La Verne or from TVMWD’s Miramar Water Treatment Plant located in the City of Claremont.

The City’s treated imported water supplies from MWD, through TVMWD, may be impacted during a multi-year drought or other conditions which limits MWD from delivering sufficient water supplies to all its member agencies, and consequently to the City. A description of this supply and its reliability is provided in Part 1 Chapter 3 and Part 1 Chapter 5 of the 2025 RUWMP.

4.1.2. Covina Valley Water Company
The City does not use self-supplied surface water sources to meet its water demands. The City purchases treated surface water supplies from CVWC (formerly Covina Irrigation Company) (see Part 1, Section

3.3). CVWC sources of supply include surface water diversions from the San Gabriel River, groundwater pumped from the Main San Gabriel Basin and untreated imported water. CVWC owns the Temple Plant, which is a surface water treatment plant located near the intersection of Arrow Highway and Grand Avenue in the City of Glendora, which is used to treat the local surface water and the imported water.

The Temple Plant has a capacity of approximately 10 million gallons per day (MGD).

The City owns a connection with CVWC, with a maximum capacity of 3.3 cubic feet per second (cfs) which can supply up to approximately 1,500 gallons per minute. Through this connection, the City can purchase treated surface water and groundwater. CVWC water supplies augment the City’s sources of supply from the Main San Gabriel groundwater basin and treated imported water.

4.2. Groundwater
The City produces groundwater from the Main Basin. The Main Basin is a sub-basin of the San Gabriel Valley Basin. The Main Basin has been adjudicated and is managed for long-term sustainability; a 2025 Urban Water Management Plan: Individual Chapter
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detailed hydrogeological description of the Main Basin is provided in Part 1, Section 3.2.1 of the 2025 RUWMP.

4.2.1. Main San Gabriel Basin
The Watermaster manages the Main Basin through an Operating Safe Yield (OSY), which is determined annually based on groundwater elevations and rainfall. The City of Glendora holds a prescriptive pumping right equal to 4.75261% of the declared OSY. The City manages its pumping in accordance with Watermaster rules; if the City's water demands require pumping in excess of its OSY share, the City pays a "Replacement Water" assessment to the Watermaster, which is used to purchase untreated imported water to artificially recharge the basin. See Part 1, Section 3.2.1 for more details regarding the Main Basin’s adjudication and basin management.

Extraction Infrastructure and Historical Pumping
The City operates active groundwater production wells located throughout the service area. To maintain extraction capacity and efficiency, the City proactively manages its wellfield infrastructure. As noted in Section 4.7, the City is currently pursuing the rehabilitation, redrilling, or replacement of several key assets, including Wells 2, 7, 10, 11, and 14, to ensure sufficient extraction capacity to meet future demands.

Table 4-1 summarizes the City's actual groundwater production over the past five years. Pumping volumes fluctuate annually based on total system demand, the availability of surface water, and local hydrological conditions. For example, the decrease in groundwater pumping observed in 2023 (7,706 AF) reflects reduced customer demand and increased availability of supplemental supplies during an exceptionally wet hydrologic year.

Table 4-1. DWR 6-1R Groundwater Pumped Last Five Years (AF) Groundwater Type Location or
Basin Name 2021 2022 2023 2024 2025
Alluvial Basin Main Basin 10,709 8,646 7,706 8,103 10,099 Total 10,709 8,646 7,706 8,103 10,099

4.3. Surface Water
The City does not use self-supplied surface water sources to meet its water demands. The City purchases treated surface water supplies from CVWC, as discussed in Section 4.1.

4.4. Stormwater
The City does not directly use stormwater to meet its water demands. 2025 Urban Water Management Plan: Individual Chapter
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4.5. Wastewater and Recycled Water
Wastewater generated by the City is treated by Los Angeles County Sanitation Districts (LACSD).

Wastewater is collected within the City’s local sewer collection system. The City’s local sewers tie into one of LACSD’s regional trunk sewers. The regional trunk sewer lines deliver wastewater to one or more water reclamation plants owned by LACSD for treatment. The water reclamation plants are not located within the City’s service area.

Wastewater is not treated or disposed within the City’s service area. The water reclamation plants serving the City include the San Jose Creek Water Reclamation Plant (SJCWRP) and the A.K. Warren Water Resource Facility (formerly known as the Joint Water Pollution Control Plant). The percentage breakdown between these two plants in treating the City’s wastewater is unknown. To align with current conservation realities and CWOL framework, wastewater generation is estimated utilizing the State's 2025 indoor residential water use standard of 47 GPCD (as indoor water use serves as the direct proxy for wastewater generation). Based on Glendora's 2025 population of 45,593, the estimated amount of wastewater collected by the City is approximately 2.14 MGD (about 2,400 AFY). Table 4-2 shows existing wastewater collection and treatment at the LACSD.

The City does not have access to recycled water due to the lack of infrastructure to convey recycled water supplies to the City.

4.5.1. Potential, Current, and Projected Recycled Water Uses The City does not use recycled water to meet its water demands. The wastewater collected from the City and treated at SJCWRP already is used by other recycled water customers that are outside of the City’s service area boundaries. Subject to the availability of recycled water, the City would need to construct transmission and distribution facilities to deliver recycled water to customers within its service area. 2025 Urban Water Management Plan: Individual Chapter
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Table 4-2. DWR 6-2R Wastewater Collected within Service Area in 2025 (AF) Wastewater Collection Recipient of Collected Wastewater Name of Wastewater
Collection Agency
Wastewater Volume
Metered or Estimated
Volume of Wastewater Collected
from UWMP Service Area 2025
Name of Wastewater Treatment Plant
(WWTP) and Place ID Number
Is WWTP Located Within
UWMP Area?
LACSD Estimated 2,400 AF
SJCWRP (Place ID 260156),
A.K. Warren Water Resource Facility
(Place ID 234156)
No
Total 2,400 AF
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4.6. Water Exchanges and Transfers
The City does not have any current or planned water exchange opportunities.

Water rights under the Main Basin Judgment are transferable by lease or purchase so long as such transfers meet the requirements of the Judgment. There is also provision for Cyclic Storage Agreements by which Parties and non-parties may store imported supplemental water in the Main Basin under such agreements with the Main Basin Watermaster pursuant to uniform rules and conditions and Court approval. The City can and does utilize the transfer opportunities available for Main Basin water when necessary.

4.7. Future Water Projects
The City obtains water from local groundwater, purchased local groundwater and surface water from CVWC, and imported surface water supplies. These water supply sources will allow the City to provide sufficient water service currently, and in the future. Although the City has no plans for future water supply projects, the City will construct new groundwater production wells to replace existing wells when necessary.

As part of the TVMWD Water Resources Master Plan (WRMP) and Drought Contingency Plan (DCP) with the member agencies, the City is currently pursuing several projects to increase water supply reliability.

Future projects may include:
⚫ Well #7 (Vosburg) Replacement to enhance well efficiency. ⚫ North Glendora Tank Replacement, which upgrades aging infrastructure and increase storage capacity.
⚫ Well #14 Replacement to develop a new extraction well. This project is expected to increase overall production capacity by approximately 2,000 AF.
⚫ Turf Removal for Large Commercial and Municipal Properties for conservation and efficiency efforts. This project is expected to decrease overall demand by approximately 300 AF. ⚫ Redrilling Well 10 and Well 11 to enhance well efficiency and which upgrades aging infrastructure.
⚫ Pipeline Intertie Replacements to improve system interties. ⚫ Well 2 Replacement to enhance well efficiency.
⚫ Well rehabilitation program, to improve efficiency and capacity of all wells.

Four regional water supply projects were also identified in the WRMP and DCP effort through collaboration with TVMWD, member agencies, and regional stakeholders. These regional projects, described in Part 1, Chapter 3, are intended to enhance overall supply reliability for the region. ⚫ Project 1: External Partnership with CVWC – Main Basin ⚫ Project 2: TVMWD Groundwater Reliability Improvement Program (GRIP) 2025 Urban Water Management Plan: Individual Chapter
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⚫ Project 3: TVMWD Storing Water in Main San Gabriel Basin (GRIP+) ⚫ Project 4: TVMWD–Pomona Chino Basin Conjunctive Use Exchange As development progresses and increased demands are placed on the system, the City will determine which projects to implement.

4.8. Summary of Existing and Planned Sources of Water
The City’s water supply is comprised of treated imported water, local treated surface water, and groundwater. The volume of water utilized from each source in 2025 is summarized in Table 4-3 and projected supply is summarized in Table 4-4.

Table 4-3. DWR 6-8R Actual Water Supplies in 2025 (AF)
Water Supply Additional Detail on
Water Supply
2025 Actual
Volume
2025 Potable or
Non-Potable
(optional)
2025 Total
Entitlement
(optional)
Groundwater (not
desalinated)
Main Basin 10,099 Potable
Purchased or Imported
Water
Metropolitan Water
District – TVMWD
14 Potable
Purchased or Imported
Water
CVWD 0 Potable
- Total 10,113 -
Supply Projection Methodology
To project future water supplies accurately and conservatively, the City, in coordination with TVMWD, evaluated supply projection methodologies. Rather than projecting supplies based on maximum legal entitlements or absolute physical extraction capacity, the City opted to utilize a "Real Water" (UtilizationBased) approach. This approach grounds future projections in empirical operational reality. The methodology utilized a baseline representing the City's average local supply utilization over the most recent five-year period (2021–2025), which was 9,686 acre-feet per year (AFY). This baseline smoothed out historically dry years (e.g., 2021) and historically wet years (e.g., 2023).

As described in Part 1, Section 5.1.2, to calculate the projected supplies shown in Table 4-4, the following steps were applied:

1. Climate Change Adjustments: Specific climate change vulnerability factors, derived from TVMWD’s 2024 Climate Vulnerability Analysis, were applied to the 2021-2025 baseline local agency supplies (Main Basin groundwater and CVWC purchased water) to forecast anticipated local yields through 2050.

2. Imported Water Reliance: The projected local supplies were then compared against the City's projected demand. Any projected unmet demand is assumed to be fulfilled by imported water purchases from TVMWD.
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As shown in Table 4-4 and Figure 4-1, the City's reliance on the Main Basin is projected to decrease slightly over time under a climate change planning scenario that models potential impacts to local hydrology. Under this specific scenario, imported water purchases from TVMWD are projected to increase modestly to balance the City’s overall supply portfolio and meet customer demands. It is important to note that these projections are intended for long‑term vulnerability planning purposes only; they do not incorporate future adaptation or mitigation strategies currently being developed or implemented at the regional level. Future actions, such as those identified in the DCP, are specifically designed to reduce or offset these potential climate‑related impacts to local groundwater supplies.

Table 4-4. DWR 6-9R Projected Water Supplies (AF)
Water Supply Additional Detail
on Water Supply 2030 2035 2040 2045 2050
Groundwater
(not desalinated) Main Basin 9,090 9,018 8,864 8,642 8,357 Purchased or
Imported Water
Metropolitan Water
District – TVMWD 906 853 825 867 977
Purchased or
Imported Water
Covina Valley Water
Company 8 8 7 8 9
Total 10,004 9,878 9,696 9,517 9,342
Figure 4-1. The City Projected Supply and Demand Comparison (AF)

4.9. Energy Intensity of Water Supplies
Reporting water energy intensity has many benefits for water utilities and their customers including:
⚫ Identifying energy saving opportunities as energy consumption is often a large portion of the cost of delivering water.
⚫ Calculating energy savings and greenhouse gas (GHG) emissions reductions associated with water conservation programs.
⚫ Potential opportunities for receiving energy efficiency funding for water conservation programs.

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⚫ Informing climate change mitigation strategies.
⚫ Benchmarking of energy use at each water acquisition and delivery step and the ability to compare energy use among similar agencies.

The information used to calculate the estimated energy intensity associated with the City’s water system is provided below. The energy intensity information is based on readily obtainable energy and water use data for the following water management processes: 1) extraction or diversion of water supplies; 2) placement into storage; 3) conveyance to distribution; 4) treatment; and 5) water system distribution.

The City has tabulated its energy intensity using readily obtainable energy consumption data obtained from monthly electricity bills from Southern California Edison (SCE) and Azusa Light & Water for the whole water system and the corresponding water use data obtained from available water meter readings. The City has reported the energy intensity associated with the water management processes which occur within its operational control. Because the City does not track individual energy usage for each water management process identified above, the City has estimated the energy intensity using the a “total utility approach” (i.e. sum of all water management processes). The total energy consumed was approximately 7,927,039 kWh during FY 2024-25. Although the total energy consumption reported includes electricity usage for general administration (e.g. at the City’s headquarters) which is not associated with any water management processes, the general administration energy usage is considered negligible compared to overall water system use and has not been netted out.

The total volume of water entering the potable water system was approximately 10,113 AF during FY 2024-25 and is consistent with the total volume of water provided in Table 2-2.

The total energy intensity associated with the City’s water management processes is estimated at 783.85 kWh/AF.
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5. Water Service Reliability Assessment
This section considers the City’s water supply reliability during normal years, single dry years, and up to five consecutive dry water years. The supply reliability assessment discusses factors that could potentially limit the expected quantity of water available from the City’s current source of supply through 2050.

5.1. Constraints on Water Sources
While the City maintains a highly reliable water portfolio, its supply sources are subject to various environmental, regulatory, and infrastructural constraints. A comprehensive analysis of regional water supply constraints is provided in Part 1, Chapter 3 and Part 1, Chapter 5 of the 2025 RUWMP.

For the City of Glendora specifically, the primary constraints on water sources include:
⚫ SWP-Dependent Infrastructure: Due to pipeline elevations and regional network hydraulics, the City of Glendora is situated within a "SWP-Dependent Area." This means the City is served by the Rialto Pipeline and TVMWD's Miramar Water Treatment Plant, which cannot physically receive treated Colorado River water from the CRA and rely entirely on SWP flows. As detailed in Part 1, Section 3.1.2, MWD typically buffers SWP allocation cuts using regional storage and its Water Supply Allocation Plan (WSAP). However, during severe multi-year droughts, physical limitations in delivering stored water to the Rialto Pipeline can trigger localized shortages and emergency mandates (such as the 2022 SWP-Dependent Area Emergency Conservation Program).

Consequently, during severe multi-year droughts when SWP allocations are drastically reduced by the State, the City relies more on its local groundwater reserves and CVWC purchased supplies to offset imported water constraints.
⚫ Groundwater Quality: Contaminants of Emerging Concern (CECs), such as PFAS, as well as legacy Volatile Organic Compounds (VOCs) in the Main San Gabriel Basin, can force the City to temporarily remove active extraction wells from service. To mitigate this constraint, the City is actively investing in replacement projects as detailed in Section 4.7. ⚫ Climate Change Impacts on Surface Water: The City's purchased supply from CVWC relies partially on San Gabriel River diversions. As identified in Part 1, Section 2.5, this source is highly susceptible to climate-driven volatility, including shorter rainy seasons and severe post-wildfire turbidity, which can temporarily halt treatment operations.

5.2. Year Type Characterization
In general, groundwater is less vulnerable to seasonal and climatic changes than surface water (i.e. local and imported) supplies. The Main San Gabriel Basin Watermaster monitors groundwater levels and implements supplemental recharge to maintain long term sustainability of local groundwater sources.

Further discussion of regional water resource management is included in Part 1 Chapter 3. 2025 Urban Water Management Plan: Individual Chapter
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Because the City's baseline years are a mix of different hydrologic conditions, it is important to note how the City's supply strategy adapts to dry years. The City's primary source of supply, the Main San Gabriel Basin, has a variable OSY that may decline during dry periods. However, under the basin's adjudication framework, the City can legally and physically continue to produce the water it needs to meet elevated dry-year demands by paying Replacement Water assessments for any production that exceeds its rights.

As a result, the City's operational supply strategy is not significantly different in dry years compared to normal years. The changes in the City's projected baseline supply over time are primarily driven by longterm climate change factors (as detailed in Section 4.8) and planned infrastructure projects.

Per UWMP requirements, the City has evaluated reliability for an average year, single dry year, and a five consecutive dry year period. The UWMP Act defines these years as:
⚫ Normal Year: This condition represents the water supplies a supplier considers available during normal conditions. This could be a single year or averaged range of years that most closely represents the average water supply available.
⚫ Single Dry Year: The single dry year is recommended to be the year that represents the lowest water supply available.
⚫ Five-Consecutive Year Drought: The driest five-year historical sequence for the supplier, which may be the lowest average water supply available for five years in a row.

To characterize these year types, the City evaluated historical supply and demand data. For the purposes of this 2025 UWMP, the City established a "Normal Year" baseline using the average annual supply and demand from 2021 through 2025.

Because water demand in the City typically increases during dry years due to elevated outdoor irrigation needs, the "Single Dry Year" and "Five-Year Drought" scenarios are modeled using historical years where production peaked to meet elevated drought demands. Table 5-1 summarizes the base years utilized for this analysis and the corresponding volume of water available/utilized as a percentage of the average year.

Table 5-1. DWR 7-1R Basis of Water Year Data
Year Type Base Year (FY) Volume Available
(AF) % of Average Supply
Average Year 2021-2025 9,686 100%
Single-Dry Year 2021 11,094 115%
Consecutive Dry Years 1st Year 2018 10,833 112%
Consecutive Dry Years 2nd Year 2019 9,847 102%
Consecutive Dry Years 3rd Year 2020 9,898 102%
Consecutive Dry Years 4th Year 2021 11,094 115%
Consecutive Dry Years 5th Year 2022 10,213 105%
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5.3. Water Service Reliability
The results of the reliability assessment are summarized below.

As established in Section 4.8 and Part 1, Section 5.1.2, the City utilized the "Real Water" (UtilizationBased) methodology to project its future supplies. Under this operational approach, the City projects its local groundwater and CVWC purchased supplies based on historical averages adjusted for climate change. Any remaining unmet demand is fulfilled by purchasing imported water from TVMWD.

The City’s projected "Normal Year" water demands over the next 25 years were developed using a demand-per-connection approach as discussed in Section 4.8 and Section 5.2. This approach utilizes a baseline period of 2025 to approximate normal demand patterns, projects future connections based on SCAG growth rates, and incorporates anticipated reductions due to passive conservation and compliance with the new "Making Conservation a California Way of Life" regulatory framework.

To estimate projected demands during drought conditions, the City utilized a historical ratio methodology. Because water demand in Southern California typically increases during hot, dry periods due to elevated outdoor irrigation needs, the City analyzed the ratio of total water utilized during historical dry periods compared to a historical average year.

Based on the City's operational data, the historical average year baseline was established using the fiveyear period of FY 2021–2025 (averaging 9,686 AF). ⚫ Single Dry Year Scaling: The ratio of water utilized during the historical single dry year of FY 2021 (11,094 AF) to the historical average (9,686 AF) yielded a scaling factor of 115%. This 115% factor was applied to the projected normal year demands to estimate the City's projected water demands during future single dry years.
⚫ Five-Year Drought Scaling: To estimate demands during a five-consecutive-year drought, the City utilized the historical drought sequence from FY 2018 through FY 2022. The ratio of water utilized in each of these years (10,833 AF, 9,847 AF, 9,898 AF, 11,094 AF, and 10,213 AF, respectively) compared to the historical average yielded scaling factors of 112%, 102%, 102%, 115%, and 105% for years one through five of the drought sequence, respectively. These factors were applied to the projected normal year demands to forecast future multi-year drought demands.

Because TVMWD and MWD have demonstrated 100% supply reliability to meet wholesale demands through 2050 (supported by MWD's 2025 UWMP supply reliability analysis (MWD, 2026)), the City's total supply is projected to meet its total projected demand across all hydrologic scenarios.

Consequently, the difference between supply and demand in the tables below is zero, reflecting a fully reliable water portfolio through the 2050 planning horizon.

Table 5-2, Table 5-3, and Table 5-4 summarize the City’s projected water supplies and demands over the next 25 years in five-year increments. These tables demonstrate the City can reliably meet elevated water demands during normal years, single dry years, and five-consecutive-year drought periods over the next 25 years.
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Table 5-2. DWR 7-2R Normal Year Supply and Demand Comparison (AF) Totals 2030 2035 2040 2045 2050
Supply totals 10,004 9,878 9,696 9,517 9,342
Demand totals 10,004 9,878 9,696 9,517 9,342
Difference 0 0 0 0 0
Table 5-3. DWR 7-3R Single Dry Year Supply and Demand Comparison (AF) Totals 2030 2035 2040 2045 2050
Supply totals 11,458 11,314 11,105 10,900 10,700
Demand totals 11,458 11,314 11,105 10,900 10,700
Difference 0 0 0 0 0
Table 5-4. DWR 7-4R Multiple Dry Years Supply and Demand Comparison Year Totals 2030 2035 2040 2045 2050
First Year Supply Totals 11,188 11,047 10,844 10,644 10,448 Demand Totals 11,188 11,047 10,844 10,644 10,448
Difference 0 0 0 0 0
Second Year Supply Totals 10,170 10,042 9,857 9,675 9,497 Demand Totals 10,170 10,042 9,857 9,675 9,497
Difference 0 0 0 0 0
Third Year Supply Totals 10,223 10,094 9,908 9,725 9,546 Demand Totals 10,223 10,094 9,908 9,725 9,546
Difference 0 0 0 0 0
Fourth Year Supply Totals 11,458 11,314 11,105 10,900 10,700 Demand Totals 11,458 11,314 11,105 10,900 10,700
Difference 0 0 0 0 0
Fifth Year Supply Totals 10,548 10,415 10,223 10,035 9,850 Demand Totals 10,548 10,415 10,223 10,035 9,850
Difference 0 0 0 0 0
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6. Drought Risk Assessment
The Drought Risk Assessment (DRA) is an analysis required for the 2025 UWMP, with a focus on the fiveyear consecutive drought scenario beginning in 2026. While Section 5 evaluated long-term reliability through 2050, the DRA serves as an immediate stress test, focusing specifically on the five-year period from 2026 through 2030. The purpose of this assessment is to determine if the City anticipates any supply shortages in the immediate future that would necessitate triggering mandatory demand reduction measures outlined in the Water Shortage Contingency Plan.

6.1. Data, Methods, and Basis for Water Shortage Conditions To conduct the DRA, the City utilized the same "Real Water" supply methodology and historical drought scaling factors detailed in Sections 4.8 and 5. The assessment simulates a severe, five-consecutive-year drought mirroring the hydrology of Fiscal Years 2018 through 2022.

Because hot, dry weather drives increases in outdoor irrigation, the City's unconstrained demands are projected to scale up significantly during this period (up to 115% of average baseline demand, as established in Section 0). The DRA tests whether the City's local groundwater and imported water portfolios can sustain these elevated demands over the next five years without natural replenishment.

6.2. DRA Water Source Reliability
The City's near-term reliability is highly secure due to the active management of the Main San Gabriel Basin and the unprecedented storage reserves held by its wholesale providers.

Entering the 2026–2030 DRA period, MWD holds nearly 4 million acre-feet (MAF) of water in regional storage, which is a near-record high. MWD’s 2025 UWMP DRA modeling confirms that even if the SWP and CRA experience five consecutive years of severe constraint, MWD has sufficient stored reserves to meet all wholesale member agency demands without shortage allocations through 2030. Consequently, TVMWD can reliably supply the City with imported water to cover any deficits caused by constrained local groundwater production.

6.3. Total Water Supply and Use Comparison
Table 6-1 details the DRA for the 2026–2030 period. As demonstrated in the table, the City's projected supplies are sufficient to fully and consistently meet the elevated, unconstrained demands for every year of the five-year drought sequence.

Because the City anticipates a supply surplus (a difference of zero) across all five years of the near-term drought scenario, the City does not currently project a need to implement mandatory, extraordinary conservation measures or trigger advanced stages of its WSCP due to supply shortages. However, the City remains committed to ongoing water conservation and will continue to enforce standard water waste prohibitions to preserve regional storage.
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Table 6-1. DWR 7-5 Five-Year Drought Risk Assessment (AF) Category 2026 2027 2028 2029 2030
Total Water Use (Demand) 11,188 10,170 10,223 11,458 10,548 Total Supplies 11,188 10,170 10,223 11,458 10,548
Surplus/Shortfall without WSCP Action 0 0 0 0 0
Planned WSCP Actions (use reduction and
supply augmentation)
WSCP – Supply Augmentation Benefit 0 0 0 0 0
WSCP – Use Reduction Savings Benefit 0 0 0 0 0
Revised Surplus/(Shortfall) 0 0 0 0 0
Resulting % Use Reduction from WSCP Action 0% 0% 0% 0% 0% 2025 Urban Water Management Plan: Individual Chapter
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7. Water Shortage Contingency Plan
The Water Shortage Contingency Plan (WSCP) is a strategic plan developed by the City to proactively manage and respond to both anticipated and unforeseen water shortages. A water shortage is defined as a condition in which available water supplies are inadequate to meet expected customer demand at a specific point in time. Such shortages may result from various factors, including but not limited to, water supply quality changes, climate change, drought, regional power outage, and catastrophic events (e.g., earthquake). Additionally, the State may declare a statewide drought emergency and mandate that water suppliers reduce demand.

The City’s WSCP is a detailed approach which presents how the City intends to act, or respond, in the case of an actual water shortage. It outlines a process for conducting annual water supply and demand assessments and establishes clearly defined stages and response measures to respond to actual conditions. This level of preparedness enhances transparency, ensures accountability, and supports the City’s ability to maintain reliable water service during periods of supply disruption.

The WSCP was prepared in conjunction with the 2025 RUWMP and is presented as a standalone document that may be updated as necessary. No substantive changes have been incorporated into the 2025 WSCP compared to the 2020 version. Minor editorial updates were made for clarity and consistency; however, the content, procedures, and response actions remain relatively unchanged. As of 2025, the City is operating under an adjusted Stage 3 WSCP, adopted by the City Council in May 2022.

The City’s WSCP is included in Part 4, Appendix B-7.
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8. Demand Management Measures
The Demand Management Measures (DMMs) section provides a comprehensive description of the water conservation programs that Glendora has implemented for the past five years, is currently implementing, and plans to implement in order to reduce demand. The City met the 2025 Water Use Target through the implementation of these DMMs. The City expects to continue to implement current DMMs to encourage conservation and achieve its water use targets.

8.1. Existing Demand Management Measures

8.1.1. Water Waste Prevention Ordinances
The City adopted a Drought Regulations and Water Conservation Standards Ordinance (Ordinance 1585) in April 1991. The ordinance states that it shall be a violation for any consumer or account holder to waste any water obtained from or through the water distribution facilities of the City. Waste is defined as any excessive, unnecessary or unwarranted use of water, including but not limited to any use which causes unnecessary runoff beyond the boundaries of any property as served by its meter and any failure to repair as soon as reasonably possible any leak or rupture in any water pipes, faucets, valves, plumbing fixtures or other water service appliances. In May 2008, the City adopted Ordinance 1895 which addressed water conservation, identifying two phases of implementation and restricting specific uses of water during a declared water shortage. In August 2009, the City adopted Ordinance 1925 to amend the municipal code for mandatory conservation measures. Ordinance 1925 provided additional actions to be taken during Stage 1 and Stage 2 drought conditions. In May 2015, the City adopted Urgency Ordinance 1996 which enacted mandatory emergency water conservation regulations in response to California Governor Brown’s Executive Order B-29-15 which required statewide mandatory water use reductions.

Copies of the ordinances are provided in Part 4, Appendix B-4.

The City has continuously implemented its Water Waste Prevention Ordinance over the last five years through a combination of education, outreach, and enforcement efforts. Staff have conducted 73 conservation related presentations to the general public and local schools, hosted 19 workshops, and issued over 5,219 continuous consumption notifications to proactively address potential water waste. In addition, 831 water waste violation notices have been issued, demonstrating the City’s ongoing commitment to promoting water efficiency and ensuring compliance.

8.1.2. Metering
The City meters all customer connections, including separate metering for single-family residential, commercial, industrial, large landscape and institutional/governmental facilities. Furthermore, if there is new development within the City, each facility is individually metered. Service charges for the city are based on the customers’ connection size. Further information regarding the City’s service fees and conservation pricing is provided in Section 8.1.3.

The City has continuously metered all connections over the last five years. 2025 Urban Water Management Plan: Individual Chapter
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8.1.3. Conservation Pricing
The City consumption Rates include components for Tiered Rates which includes four (4) consumption tiers and Elevation Rates. The revenue generated will fund the expenditures for groundwater production, purchased water, the storage and distribution of water, water conservation programing, and capital improvement program projects. The allowable usage in each tier takes into account the California Assembly Bill 1668 indoor water use goal, minimum usage by meter size, and the existing rate structure’s Baseline Allocation Threshold Units.

The Elevation Rate component is broken up by four (4) zone classes to assign the costs fairly and equitably. The revenue generated will fund the energy expenditures that are required to pump water to the higher zone elevations and 50% of the operation and maintenance expenditures (salaries, benefits, customer service, tools, equipment, etc.) Water connection fees are added to the commodity rates to comprise the total water bill. The water connection fees are based on the size of the meter. Water bills are sent out bi-monthly.

The water rates have been developed to fund the cost of water and are related to the overall cost of water service. The tiered allocation rate encourages the customers to conserve water due to the utilities additional cost to produce an additional unit of water. This applies to all water use sectors (e.g., single family residential, multifamily residential, industrial, institutional, etc.). Therefore, there is an economic benefit for customers to conserve water. The City’s Water Rates are currently adjustment annually by consumer price index at a not-to-exceed rate of five percent increase per year.

The City has continuously implemented conservation pricing for customer billing in accordance with its current rate schedule over the last five years.

8.1.4. Public Education and Outreach
The City developed a public information program in 2010 to educate the public to the benefits of water conservation. The program involves the dissemination of information through literature provided at City Hall and other City of Glendora facilities, as well as articles in the City of Glendora newsletter. The City periodically includes informational flyers with water bills to address water conservation and other important matters. The City periodically holds public seminars and workshops with other local agencies to promote water conservation. The City also provides water conservation information and updates on its website (https://www.cityofglendora.gov/Services/Water/Water-Conservation).

As part of a public outreach program for water conservation, City representatives visit schools to discuss water conservation with students. This discussion is usually included as part of an overall presentation on the City’s water system and how it functions.

Over the last five years, the City has continuously implemented public education and outreach activities. 2025 Urban Water Management Plan: Individual Chapter
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8.1.5. Programs to Assess and Manage Distribution System Real Losses The City's system is comprised mainly of single and multi-family dwellings. The City’s water losses range approximately from 10 to 19%, as discussed in Section 2.1.3. The City has water conservation literature that alerts customers to be on the lookout for water system leaks and to correct them promptly. The City is available to assist customers in answering questions regarding system leaks or higher than expected water usage. In addition, the City maintains two full-time staff to perform water use efficiency field surveys at the customers’ property.

As a part of normal operation and maintenance of the water system, City staff does preventive maintenance. This includes regular checks on valves and meters, and pipeline maintenance. If leaks are encountered or suspected during routine inspection of the system, further evaluation is conducted. If leaks are found, they are repaired.

The City monitors the water system for loss by comparing water production to water sales. The City will continue to monitor the water system for water loss, and if a trend develops to indicate that further analyses are required, the City will provide the necessary funds to institute another leak detection program.

Over the last five years, the City has continuously implemented the activities described here each year.

8.1.6. Water Conservation Program Coordination and Staffing Support Various City departments are involved in the water conservation program. These include maintenance and operations personnel, Public Works Director, Assistant Public Works Director, two Water Division Managers, and administrative staff who answer billing and usage questions and serve at the front counter at City Hall. The City’s conservation staff consists of a Senior Management Analyst, a Management Analyst, and two Water Conservation Officers. The City’s Water Conservation staff are responsible for all matters pertaining to the City's water conservation program including implementation of DMMs.
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8.1.7. Other Demand Management Measures

8.1.7.1. Large Landscape Conservation Programs
The City routinely hosts seminars and workshops in the community to promote landscape conservation.

The City continues to offer a rebate program for the purchase of landscape related items to both residential and commercial customers to promote water conservation. During FY 2020-2021 through FY 2023-2024, the City provided rebates for this program. During FY 2024-2025, the City participated in a regional rebate program, the SoCal WaterSmart Program.

8.1.7.2. Rebate Programs
Through TVMWD, the City participates in MWD’s regional rebate program, the SoCal WaterSmart Program, which is available to the City’s customers. There are residential rebates available for the purchase of high-efficiency clothes washing (HECW) machines, premium high-efficiency toilets (PHET), rotating sprinkler nozzles, weather-based irrigation controllers (Smart Controllers), rain barrels, rain cistern, soil moisture sensor system, and turf removal to promote water conservation. Some measures, including PHETs, Smart Controllers, and turf removal, are also available to commercial customers. The City’s commercial customers are additionally offered plumbing, landscaping, HVAC, and medical and dental equipment rebates. The City provides information about this program to customers on its website. During FY 2020-2021 through FY 2023-2024, the City provided rebates for the program. During FY 2024-2025, the City participated in the regional rebate program.

8.1.7.3. Conservation Programs for Commercial, Industrial, and Institutional Accounts
The City regularly performs water use efficiency field surveys for commercial, industrial, and institutional customers. During FY 2020-2021 through FY 2023-2024, the City performed surveys for these customers.

During FY 2023-2024, the City offered a plumbing direct install program. During FY 2024-2025, the City offered free surveys through a contracted vendor to perform indoor and outdoor water use efficiency 2025 Urban Water Management Plan: Individual Chapter
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field surveys and water-efficient device upgrades. During FY 2024-25, the City offered a non-functional turf removal rebate program. The City will continue to coordinate with this sector of the community regarding water use and conservation through the public education process described above.

8.1.7.4. Smart Water Meter Program
The City initiated a program for meter upgrade for all customers. These meters wirelessly send usage information for billing and other important service notifications directly to the utility office. Customers can access their daily water usage information on their computer. Customer notifications on leaks, high usage, and other events are available as well. These activities will support the City’s continual conservation efforts. The City provides information about this program to customers on its website available at this link.

This program has been continuously in effect for the last five years.

8.1.7.5. Free Water Conservation Programs
In FY 2023-24, the City partnered with SoCal Gas Company to co-fund energy and water efficiency upgrades for residential properties.

The City also has contracted a vendor that partners with MWD to offer Water Use Efficiency Surveys and the Irrigation Retrofit and Leak Repair Program. The surveys assess both outdoor and indoor water use for all customer classes, residential, commercial, industrial, and institutional properties. The Irrigation Retrofit and Leak Repair Program allows eligible participants to receive free irrigation upgrades.

The City provides information about this program to customers on its website available at this link.

The City implemented this program during FY 2024-2025.

8.1.8. Implementation to Achieve Water Use Targets
For decades, The City has valued and promoted conservation through implementation of a wide range of DMMs as described in this chapter. As a result, the City met its target to reduce per capita water consumption by 20% by 2020, as discussed in Section 3. Since 2020, the City has continued to implement these DMMs to promote long term water use efficiency.

Going forward, the City will continue to implement existing DMMs and explore additional programs to promote water use efficiency as a way of life.
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9. Adoption, Submittal, and Implementation
This section describes the City’s process for adopting, submitting, and implementing the 2025 RUWMP and WSCP.

9.1. Notice of Public Hearing
A joint notice was provided on behalf of all agencies whose 2025 UWMPs are part of the 2025 RUWMP to all cities and counties and other stakeholders within the region that that 2025 RUWMP is being prepared. This notice was sent at least 60 days prior to the City’s public hearing. The recipients are identified in Part 1, Chapter 1 and include all cities and counties within the City’s service area. A second notice was provided to these cities and counties with the date and time of the public hearing and the location where the draft report was available for review.

The City provided notice to the public through its website and published announcements of the public hearing in a newspaper on two occasions before the hearing. Copies of the proof of publication are included in Part 4, Appendix B-2.

9.2. Public Hearing and Adoption
The City held a public hearing on May 26, 2026 to hear public comments and consider adopting this 2025 RUWMP and the City’s WSCP. As part of the public hearing, the City provided information on their baseline values, water use targets, and implementation plan required in the Water Conservation Act of 2009. The public hearing on the 2025 RUWMP took place before the adoption of the Plan, which allowed the City the opportunity to modify the 2025 RUWMP in response to any public input before adoption.

After the hearing, the Plan was adopted as prepared or as modified after the hearing.

The City’s adoption resolution for the 2025 RUWMP and the City’s WSCP is included in Part 4, Appendix B-3.

9.3. Plan Submittal
The City will submit the 2025 RUWMP and the City’s WSCP to DWR, the State Library, and cities and counties within 30 days after adoption. The 2025 RUWMP submittal to DWR will be done electronically through DWR’s “Water Use Efficiency (WUE) Data Portal” website. The complete set of DWR Submittal Tables for the City is included in Part 4, Appendix B-5.

9.4. Public Availability
Within 30 days of submitting its Plan to DWR, the City will make the 2025 RUWMP and the City’s WSCP available for public review. Copies will be accessible during normal business hours at the City Clerk’s Office in City Hall and posted on the City’s website for public viewing. 2025 Urban Water Management Plan: Individual Chapter
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9.5. Amending an Adopted UWMP or WSCP
If the adopted 2025 RUWMP or the City’s WSCP is amended, each of the steps for notification, public hearing, adoption, and submittal will also be followed for the amended plan. 2025 Urban Water Management Plan: Individual Chapter
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10. References
American Water Works Association (AWWA). (2020-2025). Validated Water Loss Audit Reports for the City of Glendora, Fiscal Years (FY) 2020 through 2025.

The AWWA 2020-2025 audit reports are available at this link.

California Department of Water Resources (DWR). (2021, March). Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Use. Sacramento, CA.

California Department of Water Resources (DWR). (2026, February). Urban Water Management Plan Guidebook. State of California Natural Resources Agency.

California State Water Resources Control Board (SWRCB). (2024). Making Conservation a California Way of Life (CWOL) Regulation. The SWRCB CWOL regulation is available at this link.

California State Water Resources Control Board (SWRCB). Urban Water Use Objective (UWUO) Exploration Tool and Report. Sacramento, CA.

City of Glendora. (1991, April). Drought Regulations and Water Conservation Standards Ordinance (O City of Glendora. (2008, May). Water Conservation Ordinance (Ordinance 1895).

City of Glendora. (2009, August). Mandatory Water Conservation Ordinance (Ordinance 1925).

City of Glendora. (2015, May). Urgency Water Conservation Ordinance (Ordinance 1996).

City of Glendora. (2020). 2020 Urban Water Management Plan. City of Glendora.

City of Glendora. (2025-2026). City of Glendora Provided Data. Data and information provided by City of Glendora to GEI Consultants.

City of Glendora. Agency Website. City of Glendora. The City of Glendora website is available at this link.

City of Glendora. Water Conservation Resources.

The City of Glendora water conservation resources are available at this link.

Los Angeles County Sanitation Districts (LACSD). Wastewater Treatment and Water Reclamation Facilities Information. Los Angeles County, CA.

Main San Gabriel Basin Watermaster (2024). 2023-2024 Annual Report.

The 2023-2024 Annual Report is available at this link.

Metropolitan Water District of Southern California (MWD) (2025). 2025 Urban Water Management Plan Supply Reliability Analysis and Drought Risk Assessment. 2025 Urban Water Management Plan: Individual Chapter
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Metropolitan Water District of Southern California (MWD). (2026, February). 2025 Urban Water Management Plan. The MWD 2025 UWMP is available at this link.

Metropolitan Water District of Southern California (MWD). SoCal WaterSmart Program.

The MWD SoCal WaterSmart program is available at this link.

Southern California Association of Governments (SCAG) (2021, March). Regional Data and Forecasts.

SCAG.

Southern California Association of Governments (SCAG) (2021, March). Regional Housing Needs Assessment (RHNA) Allocation Plan, Sixth Cycle (October 2021-October 2029). SCAG.

Southern California Association of Governments (SCAG) (2024). Demographics and Regional Forecasting Data. SCAG.

Three Valleys Municipal Water District (TVMWD) (2024). 2024 Climate Vulnerability Analysis.

Three Valleys Municipal Water District (TVMWD). (2025, February). Water Resources Master Plan.

The TVMWD Water Resources Master Plan is available at this link.

U.S. Census Bureau. (2024). 2020 Census Data. United States Census Bureau.

Valencia Heights Water Company (VHWC). (2023, August). Merger Notice.

The VHWC Merger Notice is available at this link.

THREE VALLEYS REGIONAL URBAN

WATER MANAGEMENT PLAN
Regional Supporting Information

PUBLIC REVIEW DRAFT
2025 Part 3:

APRIL 2026

THREE VALLEYS REGIONAL

URBAN WATER MANAGEMENT PLAN
2025 Part 3: Regional Supporting Information
APRIL 2026
Prepared by GEI Consultants, Inc. and Water Systems Consulting, Inc. 2025 RUWMP – Part 3 Appendices
A: RUWMP Checklist
Requirement Summary 2025 Regional UWMP Location Compliance Status
Coordination with local agencies and
shared supplies
Part 1 Chapter 1
Section 3 Met
Public participation prior to adoption
Part 1 Chapter 1
Section 1.3.2
Part 3 Appendix B-C
Met
Public hearing and adoption Part 1 Chapter 1
Section 1.4 Met
Submittal to DWR and State Library Part 3 Appendix G Met Describe service area and regional
setting
Part 1 Chapter 1
Section 1 Met
Climate description
Part 1 Chapter 2
Section 1
Part 3 Appendix I
Met
Demographics & population
projections
Part 1 Chapter 2
Sections 3 Met
Land use Part 1 Chapter 2
Section 4 Met
Identify and quantify existing and
planned water supplies Part 1 Chapters 3 and 5 Met
Normal, single-dry, and five-year
drought supply Part 1 Chapter 5 Met
Management of multiple sources Part 1 Chapter 3 Met
Planned water supply projects Part 1 Chapter 3
Section 9 Met
Transfers/exchanges Part 1 Chapter 3
Section 6 Met
Desalination opportunities Part 1 Chapter 3
Section 8
Basin descriptions Part 1 Chapter 3
Section 2 Met
Adjudication / SGMA status Part 1 Chapter 3
Part 3 Appendix K-P
Met
Historic and projected pumping Part 1 Chapter 3 Met
Wastewater treatment and recycled
water use
Part 1 Chapter 3
Section 5
Met
Planned reuse and feasibility Part 1 Chapter 3
Section 5.3 Met
Historic and projected water use Part 1 Chapter 4 Met
SBX7-7 compliance Part 1 Chapter 4
Section 2.1 Met
UWUO & CWOL framework Part 1 Chapter 4
Section 2.2 Met
Requirement Summary 2025 Regional UWMP Location Compliance Status
Demand Management Measures
(DMMs)
Part 1 Chapter 4
Section 2.3 Met
20-year WSRA Part 1 Chapter 5 Met
Lay description of WSRA Part 1 Chapter 1
Executive Summary Met
Five-year drought risk analysis Part 1 Chapter 5
Section 2.3 Met
Lay description of DRA
Part 1 Chapter 1
Executive Summary
Part 1 Chapter 5
Met
WSCP summary and consistency Part 1 Chapter 1 Met
2025 RUWMP – Part 3 Appendices
B: 60-Day Notice of Preparation Letters
Agency 60-Day Notice of Preparation Reference
Three Valleys Municipal Water District Part 4 Appendix A-2 – Attachment 1 City of Glendora Part 4 Appendix B-2 – Attachment 1
City of La Verne Part 4 Appendix C-2 – Attachment 1
City of Pomona Part 4 Appendix D-2 – Attachment 1
Golden State Water Company - Claremont Part 4 Appendix E-2 – Attachment 1 Golden State Water Company - San Dimas Part 4 Appendix F-2 – Attachment 1 Rowland Water District Part 4 Appendix G-2 – Attachment 1 Walnut Valley Water District Part 4 Appendix H-2 – Attachment 1 2025 RUWMP – Part 3 Appendices
C: Notice Distribution Lists
To be included in final document.
2025 RUWMP – Part 3 Appendices
D: Proofs of Publication
To be included in final document.
2025 RUWMP – Part 3 Appendices
E: Regional Workshops Materials
2025 RUWMP – Part 3 Appendices
E – Attachment 1: Regional Workshop #1 Materials
To view the materials for regional workshop #1, use this link. 2025 RUWMP – Part 3 Appendices
E – Attachment 2: Regional Workshop #2 Materials
To view the materials for regional workshop #2, use this link. 2025 RUWMP – Part 3 Appendices
F: Three Valleys Regional Urban Water Management Plan
Adoption Resolution
To be included in final document.
2025 RUWMP – Part 3 Appendices
G: Transmittal Letters to State Library and Cities/Counties To be included in final document.
2025 RUWMP – Part 3 Appendices
H: Three Valleys Municipal Water District 2025 Water
Resources Master Plan
To view the 2025 Water Resources Master Plan, use this link. 2025 RUWMP – Part 3 Appendices
I: 2024 Climate Change Vulnerability Analysis
To be included in final document.
2025 RUWMP – Part 3 Appendices
J: Metropolitan Water District Wholesaler Reliability Data To be included in final document.
2025 RUWMP – Part 3 Appendices
K: Main Basin Materials
2025 RUWMP – Part 3 Appendices
K – Attachment 1: Main San Gabriel Basin Judgment
To view the Main San Gabriel Basin Judgement, use this link. 2025 RUWMP – Part 3 Appendices
K – Attachment 2: Main San Gabriel Basin Five-Year Water Quality and Supply Plan (2023-2028)
To view the Five-Year Water Quality and Supply Plan for 2023-2028, use this link. 2025 RUWMP – Part 3 Appendices
K – Attachment 3: Three Valleys Municipal Water
District/Metropolitan Water District Main San Gabriel Basin Cyclic Storage Agreement
To be included in final document.
2025 RUWMP – Part 3 Appendices
K – Attachment 4: Puente Basin Water Agency Storage and Export Agreement
To be included in final document.
2025 RUWMP – Part 3 Appendices
L: Chino Basin Materials
2025 RUWMP – Part 3 Appendices
L – Attachment 1: Chino Basin Judgment (1978)
To view the 1978 Chino Basin Judgment, use this link.
2025 RUWMP – Part 3 Appendices
L – Attachment 2: Chino Basin Peace Agreement (2000)
To view the 2000 Chino Basin Peace Agreement, use this link. 2025 RUWMP – Part 3 Appendices
L – Attachment 3: Three Valleys Municipal Water District One-Time Storage Agreement (Chino Basin)
To be included in final document.
2025 RUWMP – Part 3 Appendices
L – Attachment 4: Chino Basin Optimum Basin
Management Program
To view the Optimum Basin Management Program, use this link. 2025 RUWMP – Part 3 Appendices
M: Six Basins Materials
2025 RUWMP – Part 3 Appendices
M – Attachment 1: Six Basins Judgment (1998)
To view the 1998 Six Basins Judgement, use this link.
2025 RUWMP – Part 3 Appendices
M – Attachment 2: Three Valleys Municipal Water District Operational Storage Account Agreement (Six Basins)
To be included in final document.
2025 RUWMP – Part 3 Appendices
M – Attachment 3: Six Basins Strategic Plan
To view the Six Basins Strategic Plan, use this link.
2025 RUWMP – Part 3 Appendices
N: Spadra Basin Materials
2025 RUWMP – Part 3 Appendices
N – Attachment 1: Spadra Basin Groundwater Sustainability Agency Memorandum of Agreement
To view the GSA Memorandum of Agreement, use this link
2025 RUWMP – Part 3 Appendices
N – Attachment 1: Spadra Basin Groundwater Sustainability Plan
To view the Groundwater Sustainability Plan, use this link. 2025 RUWMP – Part 3 Appendices
O: Covina Valley Water Company Pre-1914 Appropriative
Water Rights Documentation
To view the Pre-1914 Appropriative Water Rights Documentation, use this link. 2025 RUWMP – Part 3 Appendices
P: City of Pomona Pre-1914 Appropriative Water Rights
Documentation
To view the Pre-1914 Appropriative Water Rights Documentation, use this link. 2025 RUWMP – Part 3 Appendices
Q: SWRCB Wastewater Change Petition Order WW0104
To view Wastewater Change Petition Order WW0104, use this link. 2025 RUWMP – Part 3 Appendices
R: SWRCB Wastewater Change Petition Order WW0107
To view Wastewater Change Petition Order WW0107, use this link. 2025 RUWMP – Part 3 Appendices
S: Metropolitan Water District Chino Basin Dry-Year Yield Program Agreement
To view Dry-Year Yield Program Agreement, use this link. 2025 RUWMP – Part 3 Appendices
T: Central Basin Adjudication
To view Central Basin Adjudication, use this link.
2025 RUWMP – Part 3 Appendices
U: Puente Basin Materials
2025 RUWMP – Part 3 Appendices
U – Attachment 1: Puente Basin Judgment (1985)
To view 1985 Puente Basin Judgment, use this link.
2025 RUWMP – Part 3 Appendices
U – Attachment 2: Puente Narrows Agreement
To view Puente Narrows Agreement, use this link.

THREE VALLEYS REGIONAL URBAN

WATER MANAGEMENT PLAN
Urban Water Management Plan
Agency Supporting Information

PUBLIC REVIEW DRAFT
2025 Part 4:

APRIL 2026

THREE VALLEYS REGIONAL

URBAN WATER MANAGEMENT PLAN
Urban Water Management Plan
Agency Supporting Information
2025 Part 4:

APRIL 2026
Prepared by GEI Consultants, Inc. and Water Systems Consulting, Inc.

City of Glendora
Appendix B
2025 RUWMP Part 4
B
2025 Part 4: City of Glendora Appendix B
B1: UWMP Compliance Checklist
Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 1 Chapter 1 10615 A plan shall describe and evaluate sources of supply, reasonable and practical efficient uses, reclamation and demand management activities.

Introduction and
overview n/a Part 2 Chapter 2Part 1 Chapter 3
x 1 Chapter 1 10630.5
Each plan shall include a simple description of the Supplier’s plan including water availability, future requirements, a strategy for meeting needs, and other pertinent information. Additionally, a Supplier may also choose to include a simple description at the beginning of each chapter.

Plan preparation n/a Part 2 Chapter 2
Executive Summary
x 2.1 Section 2.1 10620(b) Every person that becomes a Supplier shall adopt UWMP within one year after it has become a Supplier. Plan preparation n/a Part 2 Chapter 2 x 2.5 Section 2.5 10644 Supplier shall report the Public Water Systems number, volume of delivered water, and number of connections that are included in this UWMP. Plan preparation 2-1 Part 2 Chapter 2 Section 2.1 x 2.5 Section 2.5 10644 Supplier shall report if this UWMP is an individual UWMP and whether the Supplier belongs to a regional UWMP or regional alliance. Plan preparation 2-2 Part 2 Chapter 2 x 2.5 Section 2.5 10644 Supplier shall report whether the data is in fiscal or calendar years and the units of measure used for reporting water volumes. Plan preparation 2-3 Part 2 Chapter 2 x 2.4 Section 2.4 10642
Provide supporting documentation that the Supplier has encouraged active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of the plan and contingency plan.

Plan preparation n/a
Part 2 Chapter 2 Section
9 Part 4 Appendix B-2
x 2.4 Section 2.4.2 10620(d)(3)
Coordinate the preparation of its plan with other appropriate agencies in the area, including other Suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable.

Plan preparation n/a Part 4 Appendix B-2
x 2.4 Section 2.4.1 10631(h) Retail Suppliers will include documentation that they have provided their Wholesale Supplier(s)—if any—with water use projections from that source. Plan preparation 2-4 R Part 1 Chapter 5 n/a 2.4 Section 2.4.1 10631(h)
Wholesale Suppliers will provide their Suppliers with identification and quantification of the existing and planned sources of water available from the Wholesale Supplier to the Supplier during various water year types.

Plan preparation 2-4 W n/a
x 3 Chapter 3.0 10631(a) Describe the Supplier service area. System description n/a Part 2 Chapter 2 Section

1.1 x 3.3 Section 3.3 10631(a) Describe the climate of the Supplier’s service area. System description n/a Part 2 Chapter 2 Section

1.1 x 3.4 Section 3.4.1 10631(a) Provide the current and projected service area populations for 2030, 2035, 2040, 2045 and optionally 2050. System description 3-1 Part 2 Chapter 2 Section 1.1 x 3.4 Section 3.4.2 10631(a) Describe other social, economic, and demographic factors affecting the Supplier’s water management planning. System description n/a Part 2 Chapter 2 Section 1.1 x 3.5 Section 3.5 10631(a)
Describe the land uses within the service area… include the current and projected land uses within the existing or anticipated service area affecting the Supplier’s water management planning. Describe the land uses within the service area.

System description and
baselines n/a Part 2 Chapter 2 Section 1.1
x 4.2 Sections 4.2.3 and 4.2.4 10631(d)(1) Quantify past, current, and projected water use, identifying the uses among water use sectors. System water use 4-1 and 4-2 Part 2 Chapter 2 Section 2 x 4.3 Section 4.3.1 10631(d)(3)(A) Report the distribution system water loss for each of the five years preceding the plan update. System water use 4-5 Part 2 Chapter 2 Section

2.1.3 x 4.3 Section 4.3.2 10631(d)(3)(C) Retail Suppliers shall provide data to show the distribution loss standards were met. System water use 4-6 Part 2 Chapter 2 Section 2.1.3 x 4.2 Section 4.2.5.4 10631.1(a) Include projected water use needed for lower income housing projected in the service area of the Supplier. System water use 4-3 Part 2 Chapter 2 Section 2.3 x 4.2 Section 4.2.5.3 10631(d)(4)(A) In projected water use, include estimates of water savings from adopted codes, plans, and other policies or laws. System water use 4-3 Part 2 Chapter 2 Section 2.2 Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 4.2 Section 4.2.5.3 10631(d)(4)(B) Provide citations of codes, standards, ordinances, or plans used to make water use projections. System water use 4-3 Part 2 Chapter 2 Section 2.2 x 4.2 Section 4.2.5.3 10631(d)(4)(B)(ii)
To the extent that a Supplier reports the information described in subparagraph (A), an urban water Supplier shall… Indicate the extent that the water use projections consider savings from codes, standards, ordinances, or transportation and land use plans. Water use projections that do not account for these water savings shall be noted of that fact.

System water use 4-3 Part 2 Chapter 2 Section
2 x 4.2 Section 4.2.5.6 10635(b) Demands under climate change considerations must be included as part of the drought risk assessment. System water use n/a
Part 2 Chapter 2 Section

2.4 Part 1 Chapter 5
n/a 5.1 Section 5.1 10608.36
Wholesale Suppliers shall include an assessment of present and proposed future measures, programs, and policies to help their Retail Suppliers achieve targeted water use reductions.

Baselines and targets n/a n/a
x 5.2 Section 5.2 10608.4
Retail Suppliers shall report on their compliance in meeting their water use targets. Reporting requirements will vary depending on whether the Supplier:
- Was considered an urban retail water supplier in 2020, - Met its 2020 target in 2020, or
- Was part of a merger or consolidation since 2020.

Chapter 5 Subsections 5.2.1, 5.2.2, and 5.2.3 address each of these situations.

Baselines and targets 5-1 Part 2 Chapter 2 Section
3 x 6.1 Section 6.1 10631(b)(2) When multiple sources of water supply are identified, describe the management of each supply in relationship to other identified supplies. System supplies n/a Part 2 Chapter 2 Section
4 Part 1 Chapter 3
x 6.1 Sections 6.1 and 6.2 10631(b)(1)
Provide a discussion of anticipated supply availability under a normal, single dry year, and a drought lasting five years, as well as more frequent and severe periods of drought, including changes in supply due to climate change.

System supplies n/a
Part 2 Chapter 2 Section
4 Part 2 Chapter 2 Section

5.3 Part 1 Chapter 5 Section
2 x 6.2 Section 6.2.2 10631(b)(4)(C)
Indicate whether groundwater is an existing or planned source of water available to the Supplier. If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.

Water supplies and
recycled water 6-1 Part 2 Chapter 2 Section 4.2
x 6.2 Section 6.2.2 10631(b)(4)(A)
Indicate whether a groundwater sustainability plan or groundwater management plan has been adopted by the Supplier or if there is any other specific authorization for groundwater management. Include a copy of the plan or authorization.

System supplies n/a
Part 2 Chapter 2 Section

4.2 Part 1 Chapter 3
x 6.2 Section 6.2.2 10631(b)(4)(B) Describe the groundwater basin. System supplies n/a Part 2 Chapter 2 Section

4.2 Part 1 Chapter 3
x 6.2 Section 6.2.2 10631(b)(4)(B)
Indicate if the basin has been adjudicated and include a copy of the court order or decree and a description of the amount of water the Supplier has the legal right to pump.

System supplies n/a
Part 2 Chapter 2 Section

4.2 Part 1 Chapter 3
x 6.2 Section 6.2.2 10631(b)(4)(B)
For unadjudicated basins… (include) information as to whether DWR has identified the basin as a high- or medium-priority basin in the most current official departmental bulletin…
Water supplies and
recycled water n/a
Part 2 Chapter 2 Section

4.2 Part 1 Chapter 3
x 6.2 Section 6.2.2 10631(b)(4)(B)
For unadjudicated basins… describe efforts by the Supplier to coordinate with sustainability or groundwater agencies to achieve sustainable groundwater conditions.

Water supplies and
recycled water n/a
Part 2 Chapter 2 Section

4.2 Part 1 Chapter 3
Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 6.2 Section 6.2.2. 10631(b)(4)(C)
If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.

System supplies n/a Part 2 Chapter 2 Section

4.2 x 6.2 Section 6.2.2 10631(b)(4)(D) Provide a detailed description and analysis of the amount and location of groundwater that is projected to be pumped. System supplies 6-9 Part 2 Chapter 2 Section 4.8 x 6.1 Section 6.1 10631(b) Identify and quantify the existing and planned sources of water available for 2025, 2030, 2035, 2040, 2045 and optionally 2050. System supplies 6-8 and 6-9 Part 2 Chapter 2 Section

4.8 Part 1 Chapter 3
Part 1 Chapter 5
x 6.2 Section 6.2.7 10631(c) Describe the opportunities for exchanges or transfers of water on a shortterm or long-term basis. System supplies n/a Part 2 Chapter 2 Section

4.6 x 6.2 Section 6.2.5 10633(a)
Describe the wastewater collection and treatment systems in the Supplier’s service area with quantified amount of collection and treatment and the disposal methods.

System supplies
(recycled water) 6-2 Part 2 Chapter 2Section 4.5
x 6.2 Section 6.2.5 10633(b)
Describe the quantity of treated wastewater that meets recycled water standards, is being discharged, and is otherwise available for use in a recycled water project.

System supplies
(recycled water) 6-3 Part 2 Chapter 2 Section 4.5
x 6.2 Section 6.2.5 10633(c) Describe the recycled water currently being used in the Supplier's service area.

System supplies
(recycled water) 6-4 Part 2 Chapter 2 Section 4.5.1
x 6.2 Section 6.2.5 10633(d) Describe and quantify the potential uses of recycled water and provide a determination of the technical and economic feasibility of those uses.

System supplies
(recycled water) 6-4
Part 2 Chapter 2 Section

4.5 Part 1 Chapter 3 Section
5 x 6.2 Section 6.2.5 10633(e)
Describe the projected use of recycled water within the Supplier's service area at the end of 5, 10, 15, and 20 years, and describe the actual use of recycled water in comparison to uses previously projected.

System supplies
(recycled water) 6-4 and 6-5
Part 2 Chapter 2 Section

4.5 Part 1 Chapter 3 Section
5 x 6.2 Section 6.2.5 10633(f)
Describe the actions that may be taken to encourage the use of recycled water and the projected results of these actions in terms of acre-feet of recycled water used per year.

System supplies
(recycled water) 6-6 Part 1 Chapter 3 Section 5
x 6.2 Section 6.2.5 10633(g) Provide a plan for optimizing the use of recycled water in the Supplier's service area.

System supplies
(recycled water) n/a Part 1 Chapter Section 5
x 6.2 Section 6.2.6 10631(g) Describe desalinated water project opportunities for long-term supply. System supplies 6-7 Part 1 Chapter 3 Section 8 x 6.2 Section 6.2.10 10631(f)
Describe the expected future water supply projects and programs that may be undertaken by the water Supplier to address water supply reliability in average, single-dry, and for a period of drought lasting five consecutive water years.

System supplies 6-7
Part 2 Chapter 1 Section

4.7 Part 1 Chapter 3 Section
9 x 6.3 Section 6.3 and
Appendix O 10631.2(a) The UWMP must include energy information, as stated in the code, that a Supplier can readily obtain.

System suppliers,
energy intensity
O-1A, O-1B, O-1C,
and O-2
Part 2 Chapter 2 Section

4.9 x 7.1 Section 7.1 10634
Provide information on the quality of existing sources of water available to the Supplier and the manner in which water quality affects water management strategies and supply reliability.

Water supply reliability
assessment n/a
Part 2 Chapter 2 Section
5 Part 1 Chapter 3
x 7.2 Section 7.2 10635(a)
Service Reliability Assessment: Assess the water supply reliability during normal, dry, and a drought lasting five consecutive water years by comparing the total water supply sources available to the Supplier with the total projected water use over the next 20 years.

Water supply reliability
assessment 7-2, 7-3, and 7-4
Part 2 Chapter 2
Section 5.3
Part 1 Chapter 5 Section
2 x 7.2 Section 7.2.3 10620(f) Describe water management tools and options to maximize resources and minimize the need to import water from other regions.

Water supply reliability
assessment n/a Part 1 Chapter 3
Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 7.3 Section 7.3 10635(b) Provide a drought risk assessment as part of information considered in developing the demand management measures and water supply projects.

Water supply reliability
assessment n/a
Part 2 Chapter 2 Section

2.4 Part 1 Chapter 5
x 7.3 Section 7.3 10635(b)(1)
Include a description of the data, methodology, and basis for one or more supply shortage conditions that are necessary to conduct a drought risk assessment for a drought period that lasts five consecutive years.

Water supply reliability
assessment n/a
Part 2 Chapter 2 Section
6 Part 1 Chapter 5
x 7.3 Section 7.3 10635(b)(2) Include a determination of the reliability of each source of supply under a variety of water shortage conditions.

Water supply reliability
assessment n/a
Part 2 Chapter 8 Section
6 Part 1 Chapter 5
x 7.3 Section 7.3 10635(b)(3) Include a comparison of the total water supply sources available to the Supplier with the total projected water use for the drought period.

Water supply reliability
assessment 7-5
Part 2 Chapter 2 Section
6 Part 1 Chapter 5
x 7.3 Section 7.3 10635(b)(4)
Include considerations of the historical drought hydrology, plausible changes on projected supplies and demands under climate change conditions, anticipated regulatory changes, and other locally applicable criteria.

Water supply reliability
assessment n/a
Part 2 Chapter 2 Section

5.1 Part 1 Chapter 5
x 8 Chapter 8 10632(a) Provide a water shortage contingency plan (WSCP) with specified elements below.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8 Chapter 8 10632(a)(1) Provide an analysis of water supply reliability (from Guidebook Chapter 7) in the WSCP.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.2 Section 8.2 10632(a)(2)(A) Provide the written decision-making process and other methods that the Supplier will use each year to determine its water reliability.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.2 Section 8.2 10632(a)(2)(B) Provide data and methodology to evaluate the Supplier’s water reliability for the current year and one dry year pursuant to factors in the code.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.3 Section 8.3 10632(a)(3)(A)
Define six standard water shortage levels of 10%, 20%, 30%, 40%, 50% shortage, and greater than 50% shortage. These levels shall be based on supply conditions, including percent reductions in supply, changes in groundwater levels, changes in surface elevation, or other conditions. The shortage levels shall also apply to a catastrophic interruption of supply.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.3 Section 8.3 10632(a)(3)(B) Suppliers with an existing WSCP that uses different water shortage levels must cross reference their categories with the six standard categories.

Water shortage
contingency planning 8-1 Part 4 Appendix B-7
x 8.4 Section 8.4 10632(a)(4)(A) Suppliers with WSCPs that align with the defined shortage levels must specify locally appropriate supply augmentation actions.

Water shortage
contingency planning 8-2 Part 4 Appendix B-7
x 8.4 Section 8.4 10632(a)(4)(B) Specify locally appropriate demand reduction actions to adequately respond to shortages.

Water shortage
contingency planning 8-3 Part 4 Appendix B-7
x 8.4 Section 8.4 10632(a)(4)(C) Specify locally appropriate operational changes. Water shortage contingency planning 8-2 Part 4 Appendix B-7
x 8.4 Section 8.4 10632(a)(4)(D)
Specify additional mandatory prohibitions against specific water use practices that are in addition to State-mandated prohibitions are appropriate to local conditions.

Water shortage
contingency planning Table 8-3 Part 4 Appendix B-7
x 8.4 Section 8.4 10632(a)(4)(E) Estimate the extent to which the gap between supplies and demand will be reduced by implementation of the action.

Water shortage
contingency planning 8-2 and 8-3 Part 4 Appendix B-7
x 8.4 Section 8.4.6 10632.5 The UWMP shall include a seismic risk assessment and mitigation plan. Water shortage contingency plan n/a Part 4 Appendix B-7
x 8.5 Section 8.5 10632(a)(5)(A) Suppliers must describe that they will inform customers, the public and others regarding any current or predicted water shortages.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.5 Section 8.5 10632(a)(5)(B),
10632(a)(5)(C)
Suppliers must describe that they will inform customers, the public and others regarding any shortage response actions triggered or anticipated to be triggered and other relevant communications.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.6 Section 8.6 10632(a)(6) Retail Supplier must describe how it will ensure compliance with and enforce provisions of the WSCP.

Water shortage
contingency planning n/a Part 4 Appendix B-7
Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 8.7 Section 8.7 10632(a)(7)(A) Describe the legal authority that empowers the Supplier to enforce shortage response actions.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.7 Section 8.7 10632(a)(7)(B) Provide a statement that the Supplier will declare a water shortage emergency per Water Code Chapter 3. Water Shortage Emergencies.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.7 Section 8.7 10632(a)(7)(C)
Provide a statement that the Supplier will coordinate with any city or county within which it provides water for the possible proclamation of a local emergency.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.8 Section 8.8 10632(a)(8)(A) Describe the potential revenue reductions and expense increases associated with activated shortage response actions.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.8 Section 8.8 10632(a)(8)(B)
Provide a description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.8 Section 8.8 10632(a)(8)(C) Retail Suppliers must describe the cost of compliance with Water Code Chapter 3.3, Excessive Residential Water Use During Drought.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.9 Section 8.9 10632(a)(9)
Retail Suppliers must describe the monitoring and reporting requirements and procedures that ensure appropriate data are collected, tracked, and analyzed for purposes of monitoring customer compliance.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.10 Section 8.10 10632(a)(10)
Describe reevaluation and improvement procedures for monitoring and evaluation the WSCP to ensure risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.11 Section 8.11 10632(b)
Analyze and define water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 8.12 Section 8.12 10632(c) Make available the WSCP to customers and any city or county where it provides water within 30 days after adoption of the plan.

Water shortage
contingency planning n/a Part 4 Appendix B-7
x 9.1 Sections 9.1 10631(e)(1)
Retail Suppliers shall provide a description of the nature and extent of each demand management measure implemented over the past five years. The description will address specific measures listed in code.

Demand management
measures n/a Part 2 Chapter 2 Section 8
n/a 9.2 Sections 9.2 10631(e)(2)
Wholesale Suppliers shall describe specific demand management measures listed in code, their distribution system asset management program, and Supplier assistance program.

Demand management
measures n/a n/a
x 10 Chapter 10 10608.26(a)
Retail Suppliers shall conduct a public hearing to discuss adoption, implementation, and economic impact of water use targets (recommended to discuss compliance).

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.2 Section 10.2.1 10621(b)
Notify, at least 60 days prior to the public hearing, any city or county within which the Supplier provides water that the Supplier will be reviewing the UWMP and considering amendments or changes to the plan.

Plan adoption,
submittal, and
implementation
10-1
Part 2 Chapter 2 Section
9 Part 4 Appendix B-2
x 10.4 Section 10.4 10621(f) Each urban water Supplier shall update and submit its 2025 plan to DWR by July 1, 202 6.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.2 Sections 10.2.2, 10.3,
and 10.5 10642
Provide supporting documentation that the Supplier made the UWMP and WSCP available for public inspection, published notice of the public hearing, and held a public hearing about the UWMP and WSCP.

Plan adoption,
submittal, and
implementation
n/a Part 4 Appendix B-3
x 10.2 Section 10.2.2 10642 The Supplier is to provide the time and place of the hearing to any city or county within which the Supplier provides water.

Plan adoption,
submittal, and
implementation
10-1 Part 4 Appendix B-3
x 10.3 Section 10.3.2 10642 Provide supporting documentation that the UWMP and WSCP has been adopted as prepared or modified.

Plan adoption,
submittal, and
implementation
n/a Part 4 Appendix B-3
Retail
(x = required) Order 2025 Guidebook Location
Water Code
Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x 10.4 Section 10.4 10644(a) Provide supporting documentation that the Supplier has submitted their UWMP to the California State Library.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.4 Section 10.4 10644(a)(1)
Provide supporting documentation that the Supplier has submitted their UWMP to any city or county within which the Supplier provides water no later than 30 days after adoption.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.4 Sections 10.4.1 and

10.4.2 10644(a)(2) The UWMP, or amendments to the UWMP, submitted to DWR shall be submitted electronically.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.7 Section 10.7.2 10644(b) If revised, submit a copy of the WSCP to DWR within 30 days of adoption.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.5 Section 10.5 10645(a)
Provide supporting documentation that, not later than 30 days after filing a copy of its UWMP with DWR, the Supplier has or will make the plan available for public review during normal business hours.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.5 Section 10.5 10645(b)
Provide supporting documentation that, not later than 30 days after filing a copy of its WSCP with DWR, the Supplier has or will make the plan available for public review during normal business hours.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 x 10.6 Section 10.6 10621(c) If Supplier is regulated by the Public Utilities Commission, include its plan and contingency plan as part of its general rate case filings.

Plan adoption,
submittal, and
implementation
n/a Part 2 Chapter 2 Section
9 2025 Part 4: City of Glendora Appendix B
B2: Public Outreach
2025 Part 4: City of Glendora Appendix B
B2: Attachment 1 – 60-Day Notice of Preparation Letters Document will be provided on request through our contact us webpage. 2025 Part 4: City of Glendora Appendix B
B2: Attachment 2 – Regional Workshop #1 Materials
To be included in the final document
2025 Part 4: City of Glendora Appendix B
B2: Attachment 3 – Regional Workshop #2 Materials
To be included in the final document
2025 Part 4: City of Glendora Appendix B
B3: Adoption Resolution
To be included in the final document.
2025 Part 4: City of Glendora Appendix B
B4: Ordinances
The following ordinances are available online. Select the links to view, Ordinance 1895, Ordinance 1925, and Ordinance 1996.
2025 Part 4: City of Glendora Appendix B
B5: DWR Tables
Submittal Table 2-1 Retail: Public Water Systems
Public Water System
Number
Public Water System
Name
Number of Municipal
Connections 2025
Volume of Water
Supplied 2025 (AF)
CA1910044 City of Glendora 13,434 10,113
Total 13,434 10,113
Submittal Table 2-2: Plan Identification
Type of Plan Name of Regional Alliance or RUWMP
Individual UWMP Three Valleys Regional Urban Water
Management Plan
Submittal Table 2-3: Supplier Identification
Type of Supplier Year Type
Month and date
that the year begins
(mm/dd)
Units of measure
used in UWMP
Supplier is a retail supplier Fiscal Year 07/01 AF
Submittal Table 2-4 Retail: Water Supplier Information Exchange The retail Supplier has informed the following wholesale supplier(s) of projected water use.

Wholesale Water Supplier Name
Three Valleys Municipal Water District
Upper San Gabriel Valley Municipal Water District
Covina Valley Water Company
Submittal Table 3-1 Retail: Population - Current and Projected Category 2025 2030 2035 2040 2045 2050(opt)
Population Served 45,593 45,943 46,294 46,368 46,441 46,515 Submittal Table 4-1 Retail: Total Uses for Potable and Non-Potable Water — Actual Use Type
Additional
Description
(as needed)
2025 Actual Water
Use
Potable or NonPotable
2025 Actual Water
Use
Volume (AF)
Single Family Potable 6,710
Multi-Family Potable 445
Commercial Potable 1,161
Landscape Potable 343
Sales/Transfers/Exchanges
to other Suppliers Potable 18
Distribution System Water
Loss Potable 1,436
Subtotal Potable 1,0113
Subtotal Non-Potable 0
Total 10,113
Submittal Table 4-2 Retail: Total Uses for Potable, and Non-Potable Water — Projected Use Type Additional
Description
Projected Water
Use
Potable or NonPotable
(Optional)
Projected
Water Use
2030 (AF)
Projected
Water Use
2035 (AF)
Projected
Water Use
2040 (AF)
Projected
Water Use
2045 (AF)
Projected
Water Use
2050 opt (AF)
Single Family Potable 6,618 6,535 6,415 6,296 6,180
Multi-Family Potable 587 580 569 559 548
Commercial Potable 1,185 1,170 1,148 1,127 1,107
Landscape Potable 161 159 156 153 151
Sales/Transfers/
Exchanges to
other Suppliers
Potable 47 46 45 45 44
Distribution
System Water
Loss
Potable 1,405 1,388 1,362 1,337 1,312
Subtotal Potable 10,003 9,878 9,695 9,517 9,342
Subtotal NonPotable 0 0 0 0 0
Total 10,003 9,878 9,695 9,517 9,342
Submittal Table 4-3 Retail: Inclusion in Water Use Projections Projection Item Included in
Projections?
Are Future Water Savings Included in Projections? Yes
Are Lower Income Residential Demands Included In Projections? Yes Submittal Table 4-5 Retail: Water Loss Audit Reporting
Public Water System ID # Reporting Period Submitted to DWR Water Loss Audit Program
CA1910044 2020 Yes
CA1910044 2021 Yes
CA1910044 2022 Yes
CA1910044 2023 Yes
CA1910044 2024 Yes
CA1910044 2025 Yes
Notes: Report submittal status for all five years for each Public Water System as available. The “Volume of Water Loss” quantities for FY 2019‐20 through FY 2024‐25 were obtained from the annual AWWA Water Loss Audits (and based on the combination of apparent losses and real losses). The AWWA Water Loss Audits were reported on a fiscal year basis.

Submittal Table 4-6 Retail: Progress Towards 2028 Water Loss Standard Public Water
System ID #
Reported in
Submittal Table
2-1 R
Did the Water
Board Calculate
a Water Loss
Standard for this
Public Water
System?
Real Water Loss
State Water
Board Standard
2028 Real Water
Loss Standard
per Unit per day
Real Water Loss
State Water
Board Standard
Units for Real
Water Loss
Real Water Loss
Most Recent
AWWA Water
Loss Audit
Number of Units
(Connections or
Miles
corresponding
with units
selected)
Real Water Loss
Most Recent
AWWA Water
Loss Audit
Volume of Total
Real Loss (AF)
(from AWWA
Water Loss
Audit)
Real Water Loss
Per Unit per Day
Apparent Water
Loss
State Water
Board Standard
2028 Apparent
Water Loss
Standard per
Unit per Day
Apparent Water
Loss
State Water
Board Standard
Units for
Apparent Water
Loss
Apparent Water
Loss
Most Recent
AWWA Water
Loss Audit
Number of
Connections
Apparent Water
Loss
Most Recent
AWWA Water
Loss Audit
Volume of Total
Apparent Loss
(AF)
(from AWWA
Water Loss
Audit)
Apparent Water
Loss Per Unit per
Day
CA1910044 Yes 20.3
Gallons per
Service
Connection per
Day (GPSCD)
13,816 1,660 107.3 13.3
Gallons per
Service
Connection per
Day (GPSCD)
13,816 121 7.8
Water Board's Calculated Water Loss Standards
Submittal Table 5-1 Retail: SB X7-7 2020 Target Progress Was Supplier
part of a
merger or
consolidation
since 2020?
Regional
Alliance
Target or
Individual
Target?
2020 Target Actual
2020 GPCD
Did Supplier
Achieve
Targeted
Reduction
for 2020?
Actual
2025 GPCD
(From SB
X7-7
Compliance
Form) *
Did Supplier
meet the
2020 Target
in 2025? *
n/a n/a 218 194 Yes 198 Yes
Notes: n/a=Not Applicable
* Only for suppliers that did not meet the Target in 2020 Submittal Table 6-1 Retail: Groundwater Volume Pumped
Groundwater
Type
Potable or
NonPotable
(OPTIONAL)
Location
or Basin
Name
2021 (AF) 2022 (AF) 2023 (AF) 2024 (AF) 2025 (AF)
Alluvial Basin Potable Main
Basin 10,709 8,646 7,706 8,103 10,099
Total 10,709 8,646 7,706 8,103 10,099
Submittal Table 6-2 Retail: Wastewater Collected Within Service Area Wastewater
Collection
Name of
Wastewater
Collection Agency
Wastewater Collection
Wastewater Volume
Metered or Estimated?
Optional
Wastewater Collection
Volume of Wastewater
Collected from UWMP
Service Area 2025 (AF)
Recipient of Collected
Wastewater
Name of Wastewater
Treatment Plant (WWTP) and
Place ID Number
Recipient of Collected
Wastewater
Is WWTP Located
Within UWMP Area?
Sanitation Districts of
Los Angeles County Estimated 2,400
San Jose Creek Water
Reclamation Plant, Place ID
260156
No
Sanitation Districts of
Los Angeles County Estimated A.K. Warren Water Resource Facility, Place ID 234156 No Total Wastewater
Received from UWMP
Service Area in 2025:
2,400
Submittal Table 6-3 Retail: Wastewater Treatment and Outcomes Within UWMP Service Area Wastewater
Treatment
Plant Name
and Place ID
Number
Does This
Plant Treat
Wastewater
Generated
Outside the
UWMP
Service
Area?
(Optional)
2025 Volume
of
Wastewater
Received
from UWMP
Service Area
(AF)
Total 2025
Volume of
Water
Treated (AF)
2025
Outcomes of
Treated
Wastewater
Water
Recycled
Within
UWMP
Service Area
Treatment
Level
2025
Outcomes of
Treated
Wastewater
Water
Recycled
Within
UWMP
Service Area
Volume (AF)
2025
Outcomes of
Treated
Wastewater
Water
Recycled
Outside of
UWMP
Service Area
Treatment
Level
2025
Outcomes of
Treated
Wastewater
Water
Recycled
Outside of
UWMP
Service Area
Volume (AF)
2025
Outcomes of
Treated
Wastewater
Effluent
Discharge
that is not a
Permitted
Recycled
Water Use
Treatment
Level
2025
Outcomes of
Treated
Wastewater
Effluent
Discharge
that is not a
Permitted
Recycled
Water Use
Volume (AF)
2025
Outcomes of
Treated
Wastewater
Required
Discharge for
Instream
Flow
Treatment
Level
2025
Outcomes of
Treated
Wastewater
Required
Discharge for
Instream
Flow
Volume (AF)
2025
Outcomes of
Treated
Wastewater
Delivered to
Another
Entity for
Additional
Treatment
Treatment
Level
2025
Outcomes of
Treated
Wastewater
Delivered to
Another
Entity for
Additional
Treatment
Volume (AF)
2025
Outcomes of
Treated
Wastewater
Delivered to
Another
Entity for
Additional
Treatment
Name of
other entity
Total 0 0 0 0 0 0 0
Notes: Wastewater was not treated or disposed of within the UWMP service area; therefore, this table was intentionally left blank.

Submittal Table 6-4 Retail: Recycled Water Direct Beneficial Uses Within Service Area Use Type
Potable or
Non-Potable
(after
treatment if
treated)
(Optional)
Additional
Information
2025
(AF)
2030
(AF)
2035
(AF)
2040
(AF)
2045
(AF)
2050
(AF)
Potential
Recycled
Water
Use
Volume
Potential
Recycled Water
Use
Narrative page
number
(Optional)
Subtotal
Potable 0 0 0 0 0 0 0
Subtotal
NonPotable0 0 0 0 0 0 0
Total 0 0 0 0 0 0 0 0
Notes: Recycled water is currently not used and not planned for use within the service area of the supplier; therefore, this table was intentionally left blank.

Submittal Table 6-5 Retail: 2020 UWMP Recycled Water Use Projection Compared to 2025 Actual Use Type 2020 Projection for 2025 (AF) 2025 Actual Use (AF) Total 0 0
Notes: Recycled water was not used in 2025 nor previously projected for use in 2020, therefore, this table was intentionally left blank.

Submittal Table 6-6 Retail: Methods to Encourage Future Recycled Water Use Name of
Action Description Planned Implementation Year
Expected Increase
in Recycled Water
Use (AF)
Total (AF) 0
Unit Conversion to AF 0
Notes: The Supplier does not plan to expand recycled water use in the future; therefore, this table was intentionally left blank, and a narrative explanation is provided in Section 4.5.1 of the UWMP.

Submittal Table 6-7 Retail: Expected Future Water Supply Projects or Programs Name of
Future Projects
or Programs
Joint Project
with other
suppliers?
If Yes, Supplier
Name
Additional
Description
Potable or
Non-Potable
(after treatment
if treated)
(OPTIONAL)
Planned
Implementation
Year
Planned for
Use in Year
Type
Expected
Increase in
Water Supply
to Supplier
(AF)
Development
of new
extraction well
No
Well #14
Replacement
to develop a
new extraction
well.

Potable Ongoing All Year Types 2,000
Notes: There are future water supply projects or programs not compatible with this table, therefore are described in narrative form in Section

4.7 of the UWMP.

Submittal Table 6-8 Retail: Water Supplies — Actual
Water Supply Additional Description
2025 Potable or
Non-Potable
(after treatment
if treated)
(Optional)
2025
Actual
Volume
(AF)
2025 Total
Entitlement
(AF)
(Optional)
Groundwater (not
desalinated) Main Basin Potable 10,099
Purchased or Imported
Water
Metropolitan Water
District - Three Valley
Municipal Water District
Potable 14
Purchased or Imported
Water Imported Potable 0
Subtotal Potable 10,113 0
Subtotal NonPotable 0 0
Total 10,113 0
Submittal Table 6-9 Retail: Water Supplies — Projected
Water Supply Additional Detail on
Water Supply
Potable or NonPotable (after
treatment if
treated)
(OPTIONAL)
Projected
Water Supply
2030
Reasonably
Available
Volume (AF)
Projected
Water Supply
2030
Total
Entitlement
(AF)
(Optional)
Projected
Water Supply
2035
Reasonably
Available
Volume (AF)
Projected
Water Supply
2035
Total
Entitlement
(AF)
(Optional)
Projected
Water Supply
2040
Reasonably
Available
Volume (AF)
Projected
Water Supply
2040
Total
Entitlement
(AF)
(Optional)
Projected
Water Supply
2045
Reasonably
Available
Volume (AF)
Projected
Water Supply
2045
Total
Entitlement
(AF)
(Optional)
Projected
Water Supply
2050
Reasonably
Available
Volume (AF)
Projected
Water Supply
2050
Total
Entitlement
(AF)
(Optional)
Groundwater
(not
desalinated)
Main Basin Potable 9,090 9,018 8,864 8,642 8,357
Purchased or
Imported Water
Metropolitan Water
District - Three Valleys
Municipal Water
District
Potable 906 853 825 867 977
Purchased or
Imported Water
Covina Valley Water
Company Potable 8 8 7 8 9
Subtotal Potable 10,004 0 9,879 0 9,696 0 9,517 0 9,343 0 Subtotal NonPotable 0 0 0 0 0 0 0 0 0 0
Total 10,004 0 9,879 0 9,696 0 9,517 0 9,343 0
Optional Submittal Table 7-1 Retail: Basis of Water Year Data (Reliability Assessment) Year Type Base Year Volume Available
(AF)
Percent of Average
Supply
Average Year 2021-2025 9,686 100%
Single-Dry Year 2021 11,094 115%
Consecutive Dry Years 1st Year 2018 10,833 112%
Consecutive Dry Years 2nd Year 2019 9,847 102%
Consecutive Dry Years 3rd Year 2020 9,898 102%
Consecutive Dry Years 4th Year 2021 11,094 115%
Consecutive Dry Years 5th Year 2022 10,213 105%
Submittal Table 7-2 Retail: Normal Year Supply and Use Comparison Total Type 2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF) Supply totals 10,004 9,879 9,696 9,517 9,343
Use totals 10,004 9,879 9,696 9,517 9,343
Difference 0 0 0 0 0
Submittal Table 7-3 Retail: Single Dry Year Supply and Use Comparison Total Type 2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF) Supply totals 11,458 11,314 11,105 10,900 10,700
Use totals 11,458 11,314 11,105 10,900 10,700
Difference 0 0 0 0 0
Submittal Table 7-4 Retail: Multiple Dry Years Supply and Use Comparison Year Total Type /
Difference 2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF) Supply totals 11,188 11,047 10,844 10,644 10,448
First year Use totals 11,188 11,047 10,844 10,644 10,448 Difference 0 0 0 0 0
Supply totals 1,010 10,042 9,857 9,675 9,497
Second year Use totals 1,010 10,042 9,857 9,675 9,497
Difference 0 0 0 0 0
Supply totals 10,223 10,094 9,908 9,725 9,546
Third year Use totals 10,223 10,094 9,908 9,725 9,546
Difference 0 0 0 0 0
Supply totals 11,458 11,314 11,105 10,900 10,700
Fourth year Use totals 11,458 11,314 11,105 10,900 10,700 Difference 0 0 0 0 0
Supply totals 10,548 10,415 10,223 10,035 9,850
Fifth year Use totals 10,548 10,415 10,223 10,035 9,850 Difference 0 0 0 0 0
Submittal Table 7-5 Retail: Five-Year Drought Risk Assessment Totals 2026 2027 2028 2029 2030
Total Water Use (AF) 11,188 10,170 10,223 11,458 10,548 Total Supplies (AF) 11,188 10,170 10,223 11,458 10,548
Difference w/o WSCP Action (AF) 0 0 0 0 0
Submittal Table 8-1: Cross-reference for Standard vs Supplier Shortage Levels Standard Shortage
Levels
Percent Shortage
Range
Suppliers Shortage
Levels
Percent Shortage
Range
1 Up to 10%
2 Up to 20%
3 Up to 30%
4 Up to 40%
5 Up to 50%
6 >50%
Notes: The Supplier uses the standard six levels of water shortage; therefore, supplier‑specific shortage levels and percentage ranges are not separately identified in this table.

Submittal Table 8-2 Retail: Supply Augmentation and Other Actions Shortage
Level
Supply Augmentation
Methods and Other
Actions by Water
Supplier
How much is this
going to reduce the
shortage gap?
(Percentage)
How much is this
going to reduce the
shortage gap?
Shortage Gap
Reduction Value (AF)
Additional
Explanation or
Reference
(Optional)
1 Transfers Not applicable (see
notes)
2 Transfers Not applicable (see
notes)
3 Transfers Not applicable (see
notes)
4 Transfers Not applicable (see
notes)
5 Transfers Not applicable (see
notes)
6 Transfers Not applicable (see
notes)
Notes: The City will consider increased production from the Main Basin using existing facilities to address increased demands. As noted on Table 2 of the WSCP, the City plans to implement demand reduction measures in the event water supplies from existing sources are not sufficient to meet anticipated demands.

Submittal Table 8-3 Retail: Demand Reduction Actions
Shortage
Level Demand Reduction Actions
How much is this
going to reduce the
shortage gap?
Volume or
Percentage
How much is this going
to reduce the shortage
gap?
Shortage Gap Reduction
Value (AF)
Additional
Explanation or
Reference
(Optional)
Penalty, Charge, or
Other
Enforcement?
1 Other - Prohibit use of potable
water for washing hard surfaces Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Yes
1 CII - Restaurants may only serve
water upon request
Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Yes
1 CII - Lodging establishment
must offer opt out of linen
service
Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Yes
1 Landscape - Restrict or prohibit
runoff from landscape irrigation Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Yes
1 Landscape - Limit landscape
irrigation to specific times Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Water prohibited
from 8am to 5pm Yes
1 Other - Customers must repair
leaks, breaks, and malfunctions
in a timely manner
Volume
Collective reduction
from all Shortage Level 1
actions is up to 1,323 AF
Must repair within
24 hours of
notification
Yes
2 Other Volume
Collective reduction
from all Shortage Level 2
actions is up to 2,646 AF
Includes all Stage 1
actions Yes
3 Other Volume
Collective reduction
from all Shortage Level 3
actions is up to 3,968 AF
Includes all Stage 2
actions Yes
Shortage
Level Demand Reduction Actions
How much is this
going to reduce the
shortage gap?
Volume or
Percentage
How much is this going
to reduce the shortage
gap?
Shortage Gap Reduction
Value (AF)
Additional
Explanation or
Reference
(Optional)
Penalty, Charge, or
Other
Enforcement?
3 Landscape - Limit landscape
irrigation to specific days Volume
Collective reduction
from all Shortage Level 3
actions is up to 3,968 AF
3 Other - Prohibit vehicle washing
except at facilities using
recycled or recirculating water
Volume
Collective reduction
from all Shortage Level 3
actions is up to 3,968 AF
4 Other Volume
Collective reduction
from all Shortage Level 4
actions is up to 5,291 AF
Includes all Stage 3
actions Yes
5 Other Volume
Collective reduction
from all Shortage Level 5
actions is up to 6,614 AF
Includes all Stage 4
actions Yes
6 Other Volume
Collective reduction
from all Shortage Level 6
actions is up to >6,614
AF
Includes all Stage 5
actions
6 Landscape - Prohibit certain
types of landscape irrigation Volume
Collective reduction
from all Shortage Level 6
actions is up to >6,614
AF
6 Water Features - Restrict water
use for decorative water
features, such as fountains
Volume
Collective reduction
from all Shortage Level 6
actions is up to >6,614
AF
Shortage
Level Demand Reduction Actions
How much is this
going to reduce the
shortage gap?
Volume or
Percentage
How much is this going
to reduce the shortage
gap?
Shortage Gap Reduction
Value (AF)
Additional
Explanation or
Reference
(Optional)
Penalty, Charge, or
Other
Enforcement?
6 Landscape - Other landscape
restriction or prohibition Volume
Collective reduction
from all Shortage Level 6
actions is up to >6,614
AF
Yes
Submittal Table 10-1 Retail: Notification to Cities and Counties City or County Name 60 Day Notice Notice of Public Hearing Azusa Yes Yes
Covina Yes Yes
Diamond Bar Yes Yes
Glendora Yes Yes
Los Angeles County Yes Yes
2025 Part 4: City of Glendora Appendix B
B6: AWWA Water Audits
The following AWWA Water Audit reports are available online. Select the links below to view each report:
• 2020 AWWA Water Audit
• 2021 AWWA Water Audit
• 2022 AWWA Water Audit
• 2023 AWWA Water Audit
• 2024 AWWA Water Audit
• 2025 AWWA Water Audit
If a link is not available, AWWA Water Audit reports for all years can be downloaded from the WUEdata website.
2025 Part 4: City of Glendora Appendix B
B7: Water Shortage Contingency Plan

2025 WATER SHORTAGE

CONTINGENCY PLAN

CITY OF GLENDORA

City of Glendora
2025 Water Shortage Contingency Plan

ACRONYMS AND ABBREVIATIONS
Acronym Definition
AF Acre-Foot
AFY Acre-Feet per Year
AMI Advanced Metering Infrastructure
CII Commercial, Industrial, and Institutional
City City of Glendora
CPI Consumer Price Index
CPUC California Public Utilities Commission
CVWC Covina Valley Water Company
CWC California Water Code
DMM Demand Management Measure
DWR California Department of Water Resources
EDRP Emergency Drought Response Plan
ERP Emergency Response Plan
FEMA Federal Emergency Management Agency
FY Fiscal Year
GPCD Gallons Per Capita Per Day
MWD Metropolitan Water District of Southern California
RRA Risk and Resilience Assessment
TVMWD Three Valleys Municipal Water District
USEPA United States Environmental Protection Agency
UWMP Urban Water Management Plan
WSAP Water Supply Allocation Plan
WSCP Water Shortage Contingency Plan
City of Glendora
2025 Water Shortage Contingency Plan

WATER SHORTAGE CONTINGENCY PLAN

LAY DESCRIPTION

WATER SHORTAGE CONTINGENCY PLAN
The City of Glendora’s (City) 2025 Water Shortage Contingency Plan (WSCP) discusses and provides the following:
• The City’s WSCP is a detailed approach which presents how the City intends to act, or respond, in the event of an actual water shortage. • Preparation of the City’s “Annual Water Supply and Demand Assessment” (Annual Assessment) is discussed. Beginning July 1, 2022, the City has submitted the Annual Assessment each year through 2025. The Annual Assessment includes a review of the City’s “unconstrained” water demands for the current year and for a potential upcoming single dry year. Unconstrained water demands represent the City’s water demands prior to any response actions the City may invoke pursuant to the City’s WSCP.
• The City will manage water supplies to minimize the adverse impacts of water shortages. The City’s plan for water usage during periods of shortage is designed to address six standard progressive water shortage levels including up to 10, 20, 30, 40, and 50 percent shortages, and a greater-than 50 percent shortage. • For each declared water supply shortage level, customers will be required to reduce their consumption by the percentage specified in the corresponding water supply shortage level.
• For each declared water supply shortage level, the City has established response actions to reduce demand on water supplies and to reduce any shortage gaps in water supplies. These demand reduction measures address irrigation, other outdoor use restrictions, and other water use prohibitions.

City of Glendora
2025 Water Shortage Contingency Plan

The operational changes the City will consider in addressing water shortages on a short-term basis are discussed and include improved monitoring, analysis, and tracking of customer water usage to enforce demand reduction measures. The City’s Emergency Response Plan (ERP) is summarized. The ERP provides the management, procedures, and designated actions the City and its employees will implement during emergency situations (including catastrophic water shortages) resulting from natural disasters, system failures, and other unforeseen circumstances.
• The preparation of the City’s seismic risk assessment and mitigation plan is discussed. The locations of earthquake faults in the vicinity of the City’s water service area are provided.
• The effectiveness of the shortage response actions for each of the City’s standard water shortage levels is presented. The City has been able to provide sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands.
• The communication protocols implemented by the City when it declares any water shortage level are presented.
• The compliance and enforcement procedures associated with City’s standard water shortage levels are presented.
• The legal authorities associated with City’s standard water shortage levels are presented.
• The financial consequences associated with City’s standard water shortage levels are presented.
• The City will evaluate the need for revising the WSCP in order to resolve any water shortage gaps, as necessary. The steps necessary for the City to adopt and amend its WSCP are presented.

City of Glendora
2025 Water Shortage Contingency Plan

WATER SUPPLY RELIABILITY ANALYSIS
________________________________________________________________________ CWC 10632.
(a)(1) The analysis of water supply reliability conducted pursuant to Section 10635. ________________________________________________________________________ The City’s sources of supply were discussed in Chapter 4 of the 2025 Urban Water Management Plan (UWMP) and consist of groundwater pumped from the Main San Gabriel Basin (Main Basin); treated, imported surface water purchased from Metropolitan Water District of Southern California (MWD) through Three Valleys Municipal Water District (TVMWD); and, local treated surface water and/or groundwater purchased from Covina Valley Water Company (CVWC). The Main Basin is adjudicated, and groundwater supplies are managed. The reliability of the various sources of supply are discussed in Chapter 5 of the 2025 UWMP. Based on the adjudication provisions in the Main Basin, the City can produce groundwater without limitation, provided an applicable assessment is paid to the Main Basin Watermaster to purchase untreated imported water for groundwater replenishment. Imported water supplies (both treated and untreated) may be impacted in the event MWD implements its Water Supply Allocation Plan (WSAP) due to a water supply shortage.

City of Glendora
2025 Water Shortage Contingency Plan

ANNUAL WATER SUPPLY AND DEMAND ASSESSMENT PROCEDURES
________________________________________________________________________ CWC 10632.
(a)(2) The procedures used in conducting an annual water supply and demand assessment that include, at a minimum, both of the following:
(A) The written decision-making process that an urban water supplier will use each year to determine its water supply reliability.
(B) The key data inputs and assessment methodology used to evaluate the urban water supplier’s water supply reliability for the current year and one dry year, including all of the following:
(i) Current year unconstrained demand, considering weather, growth, and other influencing factors, such as policies to manage current supplies to meet demand objectives in future years, as applicable.
(ii) Current year available supply, considering hydrological and regulatory conditions in the current year and one dry year. The annual supply and demand assessment may consider more than one dry year solely at the discretion of the urban water supplier. (iii) Existing infrastructure capabilities and plausible constraints. (iv) A defined set of locally applicable evaluation criteria that are consistently relied upon for each annual water supply and demand assessment.
(v) A description and quantification of each source of water supply.

CWC 10632.1.

An urban water supplier shall conduct an annual water supply and demand assessment pursuant to subdivision (a) of Section 10632 and, on or before June 1 of each year, submit an annual water shortage assessment report to the department with information for anticipated shortage, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the supplier’s water shortage contingency plan. An urban water supplier that relies on imported water from the State Water Project or the Bureau of Reclamation shall submit its annual water supply and demand assessment within 14 days of receiving its final allocations, or by June 1 of each year, whichever is later.
________________________________________________________________________ Beginning July 1, 2022, the City has submitted an Annual Assessment in accordance with Department of Water Resources’ (DWR) guidance and requirements. The Annual Assessment includes a review of the City’s unconstrained water demands (i.e., water demands prior to any projected response actions the City may trigger under this WSCP) City of Glendora
2025 Water Shortage Contingency Plan

for the current year and the upcoming (potential single dry) year. The City also includes information regarding anticipated shortages, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the City’s WSCP.

For each Annual Assessment, the City prepares a preliminary assessment which evaluates the adequacy of its water supplies for the current and upcoming years by April of each year. The preliminary assessment includes a review of water supplies for at least a single dry year.

The components of an Annual Assessment consist of the following:
• A written decision-making process
• Key data inputs and assessment methodology

DECISION MAKING PROCESS
The City produces groundwater from the Main Basin as its primary source of water supply and that basin is managed on a fiscal year basis. Consequently, during the third quarter of each fiscal year the City reviews its water demands from the initial six months along with the current groundwater basin conditions and local hydrology. This information is used to help develop the Annual Assessment. A draft of the Annual Assessment is circulated internally within the City for peer review and comment. Based on comments received, a redraft is prepared and provided to the City Manager during the Spring of each year. The draft is subsequently provided to the City Manager for final review.

Subsequently, a final draft of the Annual Assessment is provided to the City Council for review and included in the agenda as part of a City Council meeting such that it can be approved, and any recommended specific shortage response actions may be enacted.

The final Annual Assessment is provided to DWR no later than July 1 of each year.

City of Glendora
2025 Water Shortage Contingency Plan

The Annual Assessments are instrumental in providing guidance to the City for decisions regarding potential declarations of a water supply shortage and implementation of water reduction stages, instituting mandatory water restrictions, promoting water use efficiency and conservation programs, water rates and drought rate surcharges, and the necessity of pursuing alternative water supplies. This process ensures adequate water supplies resources are available to the City.

DATA AND METHODOLOGIES
The key data inputs and methodologies that are evaluated by the City during the preparation of the preliminary assessment includes the following:
1) Evaluation Criteria: The locally applicable evaluation criteria used to prepare the Annual Assessment will be identified. The evaluation criteria includes, but is not limited to, an analysis of current local hydrology (including rainfall and groundwater levels), current water demands, a review of water system improvement plans which may impact infrastructure availability, and water quality regulations which may impact groundwater availability. The City compares total demand to total supply to identify potential shortages. If shortages are identified, the City will determine the necessary WSCP level and corresponding reduction. 2) Water Supply: A description and available volume of each available water supply source is provided. The descriptions includes a quantification of each available water supply source and is based on a review of current production capacities, historical production, UWMP, and prior water supply studies (including Water Supply Assessments and/or Master Plans).
3) Unconstrained Water Demand: The potential unconstrained water demands during the current year and the upcoming (potential single dry) year, prior to any special shortage response actions, are reviewed and calculated as necessary. The review City of Glendora
2025 Water Shortage Contingency Plan

includes factors such as weather, existing and projected land uses and populations, actual customer consumption and water use factors, monthly Urban Water Supplier Reports, existing water shortage levels (see Section 3), and existing water conservation ordinances (see Section 8.1.1 of the UWMP). 4) Planned Water Use for Current Year Considering Dry Subsequent Year: The water supplies available to meet the demands during the current year and the upcoming (potential single dry) year are considered and identified by each type of supply.

The evaluation includes factors such as estimated water demands, weather, groundwater basin operating safe yields, water quality results, existing available pumping capacities, imported water allocations, contractual obligations, regulatory issues, use of emergency interconnections, and the costs associated with producing each water supply source.
5) Infrastructure Considerations: The capabilities of the water system infrastructure to meet the water demands during the current year and the upcoming (potential single dry) year are considered. Available production capacities (e.g., groundwater well capacities) and distribution system water losses (see Section 2.1.2 of the UWMP) are reviewed. In addition, capital improvement and replacement projects, as well as potential projects which may increase water system and production capacities (see Section 4.7 of the UWMP), are considered. 6) Other Factors: Additional local considerations, if any, which can affect the availability of water supplies are described.

City of Glendora
2025 Water Shortage Contingency Plan

SIX STANDARD WATER SHORTAGE LEVELS
________________________________________________________________________ CWC 10632.
(a)(3)(A) Six standard water shortage levels corresponding to progressive ranges of up to 10, 20, 30, 40, and 50 percent shortages and greater than 50 percent shortage. Urban water suppliers shall define these shortage levels based on the suppliers’ water supply conditions, including percentage reductions in water supply, changes in groundwater levels, changes in surface elevation or level of subsidence, or other changes in hydrological or other local conditions indicative of the water supply available for use.

Shortage levels shall also apply to catastrophic interruption of water supplies, including, but not limited to, a regional power outage, an earthquake, and other potential emergency events.
(a)(3)(B) An urban water supplier with an existing water shortage contingency plan that uses different water shortage levels may comply with the requirement in subparagraph (A) by developing and including a cross-reference relating its existing categories to the six standard water shortage levels.
________________________________________________________________________ The City has a legal responsibility to provide water utility services, including water for residential, commercial, industrial, public authority, and for public fire hydrants and private fire services. The City will manage water supplies prudently to minimize the adverse impacts of water shortages. In its 2015 Plan, the City’s WSCP was designed to provide a minimum of 50 percent of normal supply during a severe or extended water shortage.

Beginning with the 2020 Plan, the City’s WSCP is designed to provide water supplies in the event there is less than 50 percent of normal supply during a severe or extended water shortage. Water shortage trigger mechanisms have been established to ensure that this policy is implemented. This includes structured stages of action referred to as water shortage planning levels.

Table 1 on the following page provides a description of the six standard stages of action which may be triggered by a shortage in one or more of the City’s water supply sources, depending on the severity of the shortage and its anticipated duration.

City of Glendora
2025 Water Shortage Contingency Plan

Table 1. Water Shortage Contingency Planning Levels
Submittal Table 8-1: Water Shortage Contingency Plan Levels Shortage
Level
Percent
Shortage
Range
Shortage Response Actions
(Narrative description)
1 Up to 10%
Watering shall be prohibited from 8:00a.m. to 5:00p.m. of any yard, orchard, park, golf course, recreational area, or other area containing vegetation. The use of continuous running water from a hose, pipe, or faucet for the purpose of cleaning buildings and paved, tile, wood, plastic or other surfaces shall be prohibited, except in the event the Director determines that such use is the only feasible means of correcting a potential threat to health, sanitation or safety.

Watering with hose equipped will require a self-closing valve that requires operator pressure to activate the flow of water.
2 Up to 20%
In addition to Shortage Level 1, every operator of a hotel, motel, or other commercial lodging establishment shall institute daily washing of towels and linens only upon request and shall post signs in each room notifying customers of the Stage 1 Water Supply Shortage Level. 3 Up to 30%
In addition to Shortage Level 2, the use of water through a meter that is used solely for irrigation purposes shall be prohibited, and the City shall have the right to shut off water service to any such meter with or without notice, as allowed by law. Irrigation is limited to three days a week.
4 Up to 40%
In addition to Shortage Level 3, the private washing of all recreational vehicles and other vehicles shall be prohibited, except using a bucket and hose equipped with a self-closing valve that requires operator pressure to activate the flow of water or except at a facility using reclaimed or recycled water.
5 Up to 50% In addition to Shortage Level 4, additional restrictions may be implemented as determined by the City, after notice to customers.
6 >50% In addition to Shortage Level 5, additional restrictions may be implemented as determined by the City, after notice to customers.

The 2025 Plan requires urban water suppliers to have six standardized water shortage levels in accordance with DWR guidance. The City’s previous WSCP, originally included in the City’s 2015 Plan, was adopted and amended by the City’s Ordinance 1895 (see Appendix A), Ordinance 1925 (see Appendix B), and Urgency Ordinance 1996 (see Appendix C). These Ordinances describe a voluntary stage that will allow the City’s City of Glendora
2025 Water Shortage Contingency Plan

customers to voluntarily reduce their consumption by up to 10 percent if the City declares a Voluntary Conservation Drought Condition. If more serious drought conditions occur, these Ordinances describe two water shortage level stages that would be mandatory once put into effect. Stage 1 accounted for up to 25 percent reduction and Stage 2 accounted for up to 50 percent. Under the Urgency Ordinance 1996, the City may declare an emergency drought condition and may impose more severe restrictions to reduce water consumption, along with the restrictions put in place under the original Voluntary Stage, Stage 1, and Stage 2 water shortage levels.

For its 2025 Plan, the City will continue to incorporate the Voluntary Stage during normal water supply conditions. In 2020, the prior Stage 1 was amended into Stage 1 and Stage 2, which address a water supply reduction of up to 10 percent and 20 percent, respectively. The City’s prior Stage 2, which accounted for up to 50 percent reduction, was amended into Stage 3, Stage 4, and Stage 5, which address a water supply shortage of up to 30 percent, 40 percent, and 50 percent, respectively. The emergency drought condition described under Urgency Ordinance 1996 will be considered as the Stage 6 water shortage level that will allow the City to address a water supply reduction of more than 50 percent.

A crosswalk of the existing (prior) and current stages of action is shown in the figure below. The shortage level changes were made in 2020 and have remained the same for 2025.

City of Glendora
2025 Water Shortage Contingency Plan

Corresponding Relationships Between Supplier’s 2020 Shortage levels and the 2025 WSCP Mandated Shortage Levels
Note: The 2020 shortage levels have remained the same for 2025.

SHORTAGE RESPONSE ACTIONS
________________________________________________________________________ CWC 10632.
(a)(4) Shortage response actions that align with the defined shortage levels and include, at a minimum, all of the following:
(A) Locally appropriate supply augmentation actions.
(B) Locally appropriate demand reduction actions to adequately respond to shortages. (C) Locally appropriate operational changes.
(D) Additional, mandatory prohibitions against specific water use practices that are in addition to state-mandated prohibitions and appropriate to the local conditions. (E) For each action, an estimate of the extent to which the gap between supplies and demand will be reduced by implementation of the action. ________________________________________________________________________

DEMAND REDUCTION
Voluntary Water Conservation Drought Condition (Voluntary Stage) Under Ordinance 1895, the City Council may declare a Voluntary Stage for any period during which the City needs, or projects needing, to import 25 percent or more of its water City of Glendora
2025 Water Shortage Contingency Plan

supply during any 12-month period. While this Voluntary Stage is in effect, the City will encourage all its consumers to voluntarily reduce their water consumption by at least 10 percent. In order to do so, the City will implement the following program:
1) Educational Outreach:
a. Public mailings to residents on at least a bi-monthly basis requesting voluntary conservation and offering conservation measures suggestions. b. Purchase conservation materials that can be used to educate customers directly or indirectly through community-based organization events. c. Inform restaurants and motel/hotel establishments of the need to reduce water offerings. Supply materials and signs to assist with the implementation of voluntary conservation measures.
2) Conservation Capital Program:
a. Offer a conservation capital program to customers based on similar economic formulas adopted by the California Public Utilities Commission (CPUC).
b. Offer a conservation capital program to customers based on any program adopted by the California Public Utilities Commission (CPUC) for other water purveyors.

In addition to the Educational Outreach program, the City Manager or their designee is authorized to turn off the water of any property that fails to make corrective changes to any broken water system (e.g., sprinklers) within 72 hours, or as required by law, of being notified by the City by posting in a conspicuous location on the property.

Stage 1 Water Supply Shortage Level (Up to 10%)
A Stage 1 Water Supply Shortage Level may be implemented by the City Council when one or more of the following conditions exist:
1) Imported water is needed to meet 40 percent of the City’s water system demand for the current or next fiscal year.

City of Glendora
2025 Water Shortage Contingency Plan

2) The City’s water well production for the current fiscal year is reduced by 25 percent below the production level for the same period of the preceding year. 3) Upon recommendation by the Water Commission that a water shortage exists, such as when the projected supply and demand for water reduces storage capacities and/or a reduction in the City's ability to purchase water.

Upon adoption by the City Council of a Resolution declaring a Stage 1 Water Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the Voluntary Stage regulations shall be applicable if they are not in conflict with the more restrictive regulations of the Stage 1 Water Supply Shortage level. 2) The use of continuous running water from a hose, pipe, or faucet for the purpose of cleaning buildings and paved, tile, wood, plastic or other surfaces shall be prohibited, except in the event the Director determines that such use is the only feasible means of correcting a potential threat to health, sanitation or safety. 3) Every operator of a restaurant providing table service shall offer water only upon request and post table signs notifying its customers of drought conditions and that water is available upon request.
4) Every operator of a hotel, motel, or other commercial establishment offering lodgings shall institute daily washing of towels and linens only upon request and shall post signs in each room notifying customers of the Stage 1 Water Supply Shortage Level.
5) Any use of water that causes runoff to occur beyond the immediate vicinity of use shall be prohibited.
6) Watering shall be prohibited from 8:00 a.m. to 5:00 p.m. of any yard, orchard, park, golf course, recreational area, or other area containing vegetation, with the following exceptions:
a. The irrigation of trees and shrubs shall be allowed by any means and at any time of the day, provided that:

City of Glendora
2025 Water Shortage Contingency Plan

i. The irrigation shall be confined to the area within the drip line of a tree or shrub.
ii. There shall be no runoff as result of the irrigation. iii. The irrigation shall not exceed five minutes to each tree or shrub during any 24-hour period.
b. The irrigation of plant material within commercial nurseries shall be allowed at any time of the day provided that:
i. The water is applied only to one plant or container of plants at a time. ii. The water is applied by means of a hose equipped with an automatic shut-off nozzle.
c. The irrigation of golf course greens and City parks shall be allowed by any means and at any time of the day for the purpose of germinating seed, promoting growth of sod, or leaching minerals from the soil for new growth purposes only.
7) The Director is authorized to turn off the water of any property that fails to make corrective changes to any broken water system (e.g., sprinklers) within 24 hours of being notified by the City by posting in a conspicuous location on the property. 8) When a Stage 1 Water Supply Shortage Level is declared, all consumers shall reduce their water consumption by at least 10 percent below their average consumption for the same period of the previous years, or the year prior to the Stage 1 Water Supply Shortage Level being declared.

Stage 2 Water Supply Shortage Level (Up to 20%)
A Stage 2 Water Supply Shortage Level may be implemented by the City Council when one or more of the following conditions exist:
1) Imported water is needed to meet 40 percent of the City’s water system demand for the current or next fiscal year.
2) The City’s water well production for the current fiscal year is reduced by 25 percent below the production level for the same period of the preceding year.

City of Glendora
2025 Water Shortage Contingency Plan

3) Upon recommendation by the Water Commission that a water shortage exists, such as when the projected supply and demand for water reduces storage capacities and/or a reduction in the City's ability to purchase water.

Upon adoption by the City Council of a Resolution declaring a Stage 2 Water Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the Voluntary Stage regulations shall be applicable if they are not in conflict with the more restrictive regulations of the Stage 2 Water Supply Shortage Level. 2) The use of continuous running water from a hose, pipe, or faucet for the purpose of cleaning buildings and paved, tile, wood, plastic, or other surfaces shall be prohibited, except in the event the Director determines that such use is the only feasible means of correcting a potential threat to health, sanitation, or safety. 3) Every operator of a restaurant providing table service shall offer water only upon request and post table signs notifying its customers of drought conditions and that water is available upon request.
4) Every operator of a hotel, motel, or other commercial establishment offering lodgings shall institute daily washing of towels and linens only upon request and shall post signs in each room notifying customers of the Stage 2 Water Supply Shortage Level.
5) Any use of water that causes runoff to occur beyond the immediate vicinity of use shall be prohibited.
6) Watering shall be prohibited from 8:00a.m. to 5:00p.m. of any yard, orchard, park, golf course, recreational area, or other area containing vegetation, with the following exceptions:
a. The irrigation of trees and shrubs shall be allowed by any means and at any time of the day, provided that:
i. The irrigation shall be confined to the area within the drip line of a tree or shrub.

City of Glendora
2025 Water Shortage Contingency Plan

ii. There shall be no runoff as result of the irrigation. iii. The irrigation shall not exceed five minutes to each tree or shrub during any 24-hour period.
b. The irrigation of plant material within commercial nurseries shall be allowed at any time of the day provided that:
i. The water is applied only to one plant or container of plants at a time. ii. The water is applied by means of a hose equipped with an automatic shut-off nozzle.
c. The irrigation of golf course greens and City parks shall be allowed by any means and at any time of the day for the purpose of germinating seed, promoting growth of sod, or leaching minerals from the soil for new growth purposes only.
7) The Director is authorized to turn off the water of any property that fails to make corrective changes to any broken water system (e.g., sprinklers) within 24 hours of being notified by the City by posting in a conspicuous location on the property. 8) When a Stage 2 Water Supply Shortage Level is declared, all consumers shall reduce their water consumption by at least 10 percent below their average consumption for the same period of the previous year, or the year prior to the Stage 2 Water Supply Shortage Level being declared.

Stage 3 Water Supply Shortage Level (Up to 30%)
A Stage 3 Water Supply Shortage Level may be implemented by the City Council when any of the following conditions exist:
1) City well production losses and MWD purchased water restrictions threaten the City’s ability to meet system demand.
2) Imported water is needed to meet 60 percent of the system demand. 3) Upon recommendation by the Water Commission that a water shortage exists when the projected supply and demand for water reduces storage capacities and/or the ability to purchase water.

City of Glendora
2025 Water Shortage Contingency Plan

Upon adoption by the City Council of a Resolution declaring a Stage 3 Water Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the regulations from the preceding Stages shall be applicable as long as they are not in conflict with any more restrictive regulations of the Stage 3 Water Supply Shortage Level.
2) The use of water through a meter that is used solely for irrigation purposes shall be prohibited, and the City shall have the right to shut off water service to any such meter with or without notice, as allowed by law, to the consumer, account holder, or any person, with the following exception:
a. The watering of any yard, orchard, hillside, park, golf course, recreational area, or other area containing vegetation shall be limited to Monday, Wednesday, and Friday for all even numbered address locations, and Tuesday, Thursday, and Saturday for all odd numbered address locations.

Such watering times shall be limited to no more than 5 minutes for each water cycle station and done only between the hours of 5:00 p.m. to 8:00 a.m.
3) The private washing of all recreational vehicles and other vehicles shall be prohibited, except using a bucket and hose equipped with a self-closing valve that requires operator pressure to activate the flow of water or except at facilities using recycled or recirculating water.
4) The City Manager, or their designee, is authorized to discontinue the supply of water to third party water purveyors during a Stage 3 Water Supply Shortage Level. 5) When a Stage 3 Water Supply Shortage Level is declared, all consumers shall reduce their water usage by at least 20 percent below their average usage for the same period of the previous year, or the year prior to the Stage 3 Water Supply Shortage Level being declared.

City of Glendora
2025 Water Shortage Contingency Plan

Stage 4 Water Supply Shortage Level (Up to 40%)
A Stage 4 Water Supply Shortage Level may be implemented by the City Council when any of the following conditions exist:
1) City well production losses and MWD purchased water restrictions threaten the City’s ability to meet system demand.
2) Imported water is needed to meet 60 percent of the system demand. 3) Upon recommendation by the Water Commission that a water shortage exists when the projected supply and demand for water reduces storage capacities and/or the ability to purchase water.

Upon adoption by the City Council of a Resolution declaring a Stage 4 Water Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the regulations from the preceding Stages shall be applicable as long as they are not in conflict with any more restrictive regulations of the Stage 4 Water Supply Shortage Level.
2) The use of water through a meter that is used solely for irrigation purposes shall be prohibited, and the City shall have the right to shut off water service to any such meter with or without notice, as allowed by law, to the consumer, account holder, or any person, with the following exception:
a. The watering of any yard, orchard, hillside, park, golf course, recreational area, or other area containing vegetation shall be limited to Monday, Wednesday, and Friday for all even numbered address locations, and Tuesday, Thursday, and Saturday for all odd numbered address locations.

Such watering times shall be limited to no more than 5 minutes for each water cycle station and done only between the hours of 5:00 p.m. to 8:00 a.m.

City of Glendora
2025 Water Shortage Contingency Plan

3) The private washing of all recreational vehicles and other vehicles shall be prohibited, except using a bucket and hose equipped with a self-closing valve that requires operator pressure to activate the flow of water or except at facilities using recycled or recirculating water.
4) The City Manager, or their designee, is authorized to discontinue the supply of water to third party water purveyors during a Stage 4 Water Supply Shortage Level. 5) When a Stage 4 Water Supply Shortage Level is declared, all consumers shall reduce their water usage by at least 20 percent below their average usage for the same period of the previous year, or the year prior to the Stage 4 Water Supply Shortage Level being declared.

Stage 5 Water Supply Shortage Level (Up to 50%)
A Stage 5 Water Supply Shortage Level may be implemented by the City Council when any of the following conditions exist:
1) City well production losses and MWD purchased water restrictions threaten the City’s ability to meet system demand.
2) Imported water is needed to meet 60 percent of the system demand. 3) Upon recommendation by the Water Commission that a water shortage exists when the projected supply and demand for water reduces storage capacities and/or the ability to purchase water.

Upon adoption by the City Council of a Resolution declaring a Stage 5 Water Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the regulations from the preceding Stages shall be applicable as long as they are not in conflict with any more restrictive regulations of the Stage 5 Water Supply Shortage Level.

City of Glendora
2025 Water Shortage Contingency Plan

2) The use of water through a meter that is used solely for irrigation purposes shall be prohibited, and the City shall have the right to shut off water service to any such meter with or without notice, as allowed by law, to the consumer, account holder, or any person, with the following exception:
a. The watering of any yard, orchard, hillside, park, golf course, recreational area, or other area containing vegetation shall be limited to Monday, Wednesday, and Friday for all even numbered address locations, and Tuesday, Thursday, and Saturday for all odd numbered address locations.

Such watering times shall be limited to no more than 5 minutes for each water cycle station and done only between the hours of 5:00 p.m. to 8:00 a.m.
3) The private washing of all recreational vehicles and other vehicles shall be prohibited, except using a bucket and hose equipped with a self-closing valve that requires operator pressure to activate the flow of water or except at facilities using recycled or recirculating water.
4) The City Manager, or their designee, is authorized to discontinue the supply of water to third party water purveyors during a Stage 5 Water Supply Shortage Level. 5) When a Stage 5 Water Supply Shortage Level is declared, all consumers shall reduce their water usage by at least 20 percent below their average usage for the same period of the previous year, or the year prior to the Stage 5 Water Supply Shortage Level being declared.

Stage 6 Water Supply Shortage Level (> 50%)
A Stage 6 Water Supply Shortage Level may be implemented by the City Council in order to address any emergency water supply condition that occurs and for as long as it exists.

Upon declaration of a Stage 6 Water Supply Shortage Level and for as long as it is in effect, the following water use regulations, and such other regulations as may be adopted City of Glendora
2025 Water Shortage Contingency Plan

by Resolution of the City Council, shall apply to all use of water that is provided by or through the water distribution facilities of the City:
1) Each of the regulations of the preceding Stages shall be applicable as long as they are not in conflict with more restrictive regulations of the Stage 6 Water Supply Shortage Level.
2) All residential users shall reduce their water usage to the Residential Gallons per Capita per Day (R-GPCD) consumption levels set forth and adopted by the City, which will comply with the State of California mandated consumption reduction level regulations.
3) All non-residential users with landscape areas greater than 500 square feet shall reduce their water usage by 25 percent compared to the same billing months from the year 2013.
4) All non-residential users with no or landscape areas 500 square feet or less shall reduce their water usage by 10 percent compared to the same billing months from the year 2013.
5) All outdoor ornamental turf watering shall be limited as follows: A cycle must be complete with water shutoff for at least forty-five minutes before a new cycle can begin.
6) Promotion of water conservation by prohibition of certain actions that would result in misuse and/or waste of water (see Section 8.1 of the UWMP). 7) All operators of hotels, motels, or other commercial establishments offering lodgings shall provide guests with the option of choosing not to have towels and linens laundered daily. The operators of these facilities shall prominently display notice of this option in each guestroom using clear and easily understood language and ensure such notices are maintained.
8) The application of potable water to driveways and sidewalks. 9) The use of potable water in a fountain or other decorative water feature, except where the water is part of a recirculating system.
10)The application of potable water to outdoor landscapes during and within fortyeight hours after measurable rainfall.

City of Glendora
2025 Water Shortage Contingency Plan

11)The irrigation with potable water of ornamental turf on public street medians. 12)The irrigation with potable water of landscapes outside of newly constructed homes and buildings in a manner inconsistent with regulations or other requirements established by the California Building Standards Commission and the Department of Housing and Community Development.
13)When a Stage 6 Water Supply Shortage Level is declared, all consumers shall reduce their water usage by at least 25 percent below their average usage for the same period of the previous year, or the year prior to the Stage 6 Water Supply Shortage Level being declared.

Table 2 summarizes the City’s planned water use restrictions and conservation actions by shortage level, showing how the City will reduce water demand during different stages of a water shortage.

Table 2. Demand Reduction Actions
Submittal Table 8-3: Demand Reduction Actions
Shortage
Level
Demand Reduction Actions
Drop down list
These are the only categories that
will be accepted by the WUEdata
online submittal tool. Select those
that apply.

How much is this going to reduce
the shortage gap? Include units
used (volume type or percentage)
Additional
Explanation or
Reference
(optional)
Penalty, Charge,
or Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
1 Other - Prohibit use of potable
water for washing hard surfaces
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Yes
1 CII - Restaurants may only serve
water upon request
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Yes
1 CII - Lodging establishment must
offer opt out of linen service
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Yes
1 Landscape - Restrict or prohibit
runoff from landscape irrigation
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Yes
1 Landscape - Limit landscape
irrigation to specific times
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Water
prohibited from
8am to 5pm
Yes
1 Other - Customers must repair
leaks, breaks, and malfunctions in
a timely manner
Collective reduction from all
Shortage Level 1 actions is up to
1,323 AF
Must begin
repair within 24
hours of
notification
Yes
City of Glendora
2025 Water Shortage Contingency Plan

Submittal Table 8-3: Demand Reduction Actions
Shortage
Level
Demand Reduction Actions
Drop down list
These are the only categories that
will be accepted by the WUEdata
online submittal tool. Select those
that apply.

How much is this going to reduce
the shortage gap? Include units
used (volume type or percentage)
Additional
Explanation or
Reference
(optional)
Penalty, Charge,
or Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
2 Other
Collective reduction from all
Shortage Level 2 actions is up to
2,646 AF
Includes all
Stage 1 actions Yes
3 Other
Collective reduction from all
Shortage Level 3 actions is up to
3,968 AF
Includes all
Stage 2 actions Yes
3 Landscape - Limit landscape
irrigation to three specific days
Collective reduction from all
Shortage Level 3 actions is up to
3,968 AF
Yes
3 Other - Prohibit vehicle washing
except at facilities using recycled
or recirculating water
Collective reduction from all
Shortage Level 3 actions is up to
3,968 AF
Yes
4 Other
Collective reduction from all
Shortage Level 4 actions is up to
5,291 AF
Includes all
Stage 3 actions Yes
5 Other
Collective reduction from all
Shortage Level 5 actions is up to
6,614 AF
Includes all
Stage 4 actions Yes
6 Other
Collective reduction from all
Shortage Level 6 actions is up to
>6,614 AF
Includes all
Stage 5 actions Yes
6 Landscape - Prohibit certain types
of landscape irrigation
Collective reduction from all
Shortage Level 6 actions is up to
>6,614 AF
Yes
6 Water Features - Restrict water
use for decorative water features,
such as fountains
Collective reduction from all
Shortage Level 6 actions is up to
>6,614 AF
Yes
6 Landscape - Other landscape
restriction or prohibition
Collective reduction from all
Shortage Level 6 actions is up to
>6,614 AF
Yes
NOTES: The City will consider increased production from the Main Basin using existing facilities to address increased demands.

As noted, the City plans to implement demand reduction measures in the event water supplies from existing sources are not sufficient to meet anticipated demands.

City of Glendora
2025 Water Shortage Contingency Plan

SUPPLY AUGMENTATION
The City does not plan to add a new source of water supply to address customer demands but instead will consider increased supplies from existing sources. Table 3 reflects this approach and does not identify any new supplies. Instead, the City will focus on demand reduction measures in the event that existing sources of supply are not sufficient to meet customer demands. As discussed in Chapter 4 of the UWMP, the City’s sources of water supply include: groundwater pumped from the Main Basin; treated, imported surface water purchased from MWD through TVMWD; and local treated surface water and/or groundwater purchased from CVWC. As noted in Section 2, beginning July 1, 2022, the City has prepared and submitted an Annual Assessment which includes a review of water supplies available to meet water demands for the current and upcoming years. In the event the City is currently in, or considers entering into, one of the standard water shortage levels identified in Section 3, the City will consider the water supply augmentation actions described below.

For each water shortage level discussed in Section 3, the City will consider supplementing its existing water supplies through increased groundwater production instead of the purchase of additional imported water supplies. Due to previous critically dry conditions, MWD developed the WSAP whereby available supplies are equitably allocated to its member agencies, including TVMWD. The WSAP establishes ten different shortage levels and a corresponding drought allocation to each member agency. Based on the shortage level established by MWD, the WSAP provides a reduced drought allocation to a member agency for its M&I retail demand. The ratio of MWD water supply drought allocation to local water supply will change based on the WSAP stage. The MWD drought allocation can be used to make Full Service water deliveries at the Tier 1 rate up to a Tier 1 allocation. Any Full Service water delivered in excess of a drought allocation is subject to a penalty rate in addition to the normal rate paid for the water.

City of Glendora
2025 Water Shortage Contingency Plan

In addition to the WSAP, MWD describes supply augmentation actions in its Regional 2025 UWMP, which is incorporated by reference. MWD’s primary first response to any gap between core supplies (from the State Water Project and Colorado River) and demand is to make optimal use of its supply augmentation options, consisting of drawing from flexible supply programs and storage reserves. MWD has developed and actively manages a portfolio of water supply programs, including water transfer, storage, and exchange agreements. MWD pursues voluntary water transfer and exchange programs to help mitigate supply/demand imbalances and provide additional dry-year supply sources. In addition, MWD has developed significant storage capacity in reservoirs, conjunctive use, and other groundwater storage programs totaling approximately 6.0 million acre-feet (AF). Pursuant to MWD’s “Emergency Storage Objective,” updated in 2019, approximately 750,000 AF of total stored water is emergency storage reserved by MWD for use in the event of supply interruptions. Based on MWD’s historical and ongoing water supply and storage programs and management practices, the City will use up to the treated imported water supply made available from MWD through TVMWD in association with each of the standard water shortage levels identified in Section 3. Water demands will be addressed through increased use of the local groundwater supplies and implementation of demand reduction measures through the various stages of action.

The City will consider augmenting its existing water supplies through the production of additional groundwater from the Main Basin. The Main Basin is managed by the Main Basin Watermaster. During the period of management under the Main Basin Judgment, significant drought events have occurred. In each drought cycle, the Main Basin has been managed to maintain water levels. Parties to the Main Basin Judgment, including the City, are authorized to produce groundwater in excess of their rights and pay assessments for such production to the Main Basin Watermaster. The assessments are used to purchase untreated imported water to replenish the Main Basin. The Main Basin Watermaster purchases untreated imported water to replenish the Main Basin from MWD through TVMWD. Groundwater quality is carefully monitored and managed by the Main Basin Watermaster. Treatment facilities and/or blend plans have been developed by water City of Glendora
2025 Water Shortage Contingency Plan

agencies to meet potable water standards and to prevent the spread of any groundwater contamination. Groundwater quality in the Main Basin is not expected to impact potable supplies or constrain supply reliability. Based on historical and ongoing management practices, the City will be able to continue relying on the Main Basin for adequate supplies in response to each of the standard water shortage levels identified in Section 3.

Table 3. Supply Augmentation and Other Actions
Submittal Table 8-2: Supply Augmentation and Other Actions Shortage Level
Supply Augmentation Methods and Other Actions
by Water Supplier
Drop down list
These are the only categories that will be accepted
by the WUEdata online submittal tool
How much is this going to
reduce the shortage gap?
Include units used (volume
type or percentage)
Additional Explanation or
Reference
(optional)
1 Transfers Not applicable (see table 2)
2 Transfers Not applicable (see table 2)
3 Transfers Not applicable (see table 2)
4 Transfers Not applicable (see table 2)
5 Transfers Not applicable (see table 2)
6 Transfers Not applicable (see table 2)

OPERATIONAL CHANGES
During a water supply shortage situation, the City will manage its water supply resources to provide sufficient water supplies capable of meeting the demands of its customers.

Section 4.1 describes the City’s standard water shortage levels and associated demand reduction measures. Section 4.1 describes the City’s water supply sources and water supply augmentation actions available. The supply augmentation actions and demand reduction measures, when implemented, may potentially result in short-term operational changes which are necessary to allow the City to utilize all available water supply sources in response to water shortage situations.

As noted in Section 2, beginning July 1, 2022, the City has prepared and submitted an Annual Assessment, which includes a review of the water supplies available to meet water demands for the current and upcoming years. Preparation of the Annual Assessment assists the City in determining any potential operational changes. In addition, City of Glendora
2025 Water Shortage Contingency Plan

the City’s standard water shortage levels and the associated demand reduction measures, in conjunction with the City’s existing Demand Management Measures (DMM) (discussed in Chapter 8 of the UWMP), will be essential to the City in reducing water demands during any water shortage period. The operational changes the City will consider in addressing non-catastrophic water shortages on a short-term basis include the following:
• Improved monitoring, analysis, and tracking of customer water usage to enforce demand reduction measures.
• Optimized production from existing available water supply sources. • Potential use of emergency supply sources, including emergency interconnections.
• Potential blending of water supply resources.
• Improved monitoring, maintenance, and repairs to reduce water distribution system losses.

ADDITIONAL MANDATORY RESTRICTIONS
The mandatory restrictions that are implemented by the City to reduce customer demands are discussed in Section 4.2. There are no additional mandatory restrictions planned at this time.

EMERGENCY RESPONSE PLAN
Catastrophic water shortages are incorporated in the City’s standard water shortage levels (identified in Section 3) and the associated demand reduction measures (described in Section 4.2). In addition to the water supply augmentation actions (Section 4.1) and potential operational changes (Section 4.3) that the City may consider in order to continue City of Glendora
2025 Water Shortage Contingency Plan

providing sufficient water supplies, the City will review and implement any necessary steps included in its ERP.

As part of the “America’s Water Infrastructure Act of 2018”, community water systems serving a population greater than 3,300 people, including the City, are required to review and update their “Risk and Resilience Assessment” (RRA) and the associated ERP every five (5) years. However, due to security concerns regarding the submission of these reports, water systems are required to submit certifications to the United States Environmental Protection Agency (USEPA), confirming the current RRA and ERP have been reviewed and updated. For the City, the RRA certification was due by December 31, 2025, and the ERP certification is due by June 30, 2026.

The City’s RRA evaluates the vulnerabilities, threats, and consequences from potential hazards to the City’s water system. The City prepared its RRA (which is incorporated by reference) by evaluating the following items:
• Natural hazards and malevolent acts (i.e., all hazards); • Resilience of water facility infrastructure (including pipes, physical barriers, water sources and collection, treatment, storage, and distribution facilities, and electronic, computer, and other automated systems);
• Monitoring practices;
• Financial systems (e.g., billing systems);
• Chemical storage and handling; and
• Operation and maintenance.

The District’s RRA evaluated a series of potential malevolent acts, natural hazards, and other threats to estimate the potential “monetized risks” (i.e., associated economic consequences to both the water system and the surrounding region, and the likelihood of City of Glendora
2025 Water Shortage Contingency Plan

occurrence) associated with the City’s water facility assets. The cost-effectiveness of implementing potential countermeasures to reduce risks was also reviewed.

The City’s ERP, which is currently being reviewed and updated, provides the management, procedures, and designated actions the City and its employees will implement during emergency situations (including catastrophic water shortages) resulting from natural disasters, system failures, and other unforeseen circumstances. The City’s ERP (which is incorporated by reference) provides guidelines for evaluating an emergency situation, procedures for activating an emergency response, and details of the different response phases in order to ensure that customers receive a reliable and adequate supply of potable water. The scope of the ERP includes emergencies that directly affect the water system and the ability to maintain safe operations (such as a chlorine release, an earthquake, or a threat of contamination). The ERP also incorporates the results of the City’s RRA and includes the following:
• Strategies and resources to improve resilience, including physical and cybersecurity.
• Plans and procedures for responding to a natural hazard or malevolent act. • Actions and equipment to lessen the impact of a natural hazard or malevolent act. • Strategies to detect natural hazards or malevolent act.

The City will review the ERP for procedures regarding the utilization of alternative water supply sources in response to water supply shortages, including during the standard water shortage levels. The City will also review applicable procedures described in the ERP regarding any necessary temporary shutdown of water supply facilities, including appropriate regulatory and public notifications.

City of Glendora
2025 Water Shortage Contingency Plan

SEISMIC RISK ASSESSMENT AND MITIGATION PLAN
________________________________________________________________________ CWC 10632.5.
(a) In addition to the requirements of paragraph (3) of subdivision (a) of Section 10632, beginning January 1, 2020, the plan shall include a seismic risk assessment and mitigation plan to assess the vulnerability of each of the various facilities of a water system and mitigate those vulnerabilities.
(b) An urban water supplier shall update the seismic risk assessment and mitigation plan when updating its urban water management plan as required by Section 10621. (c) An urban water supplier may comply with this section by submitting, pursuant to Section 10644, a copy of the most recent adopted local hazard mitigation plan or multihazard mitigation plan under the federal Disaster Mitigation Act of 2000 (Public Law 106-390) if the local hazard mitigation plan or multihazard mitigation plan addresses seismic risk. ________________________________________________________________________ The City prepared a local “Hazard Mitigation Plan” which was approved by the Federal Emergency Management Agency (FEMA) in 2025. The Hazard Mitigation Plan identifies effective ways to assess the significant natural hazards (including earthquakes) that may affect the City and its residents. The Hazard Mitigation Plan provides resources, information, and strategies to reduce the City’s vulnerability to these hazards, while providing guidance for the coordination of mitigation activities throughout the City. The Hazard Mitigation Plan includes mitigation projects necessary to reduce seismic risk to the City’s water distribution system facilities (including its distribution system pipelines, groundwater wells, booster pumps, and storage reservoirs) and potential disruptions in providing water service. The City’s Hazard Mitigation Plan is provided in Appendix D.

The County of Los Angeles prepared a “All-Hazards Mitigation Plan” in 2025 which identified methods to assess significant natural hazards (including earthquakes) affecting areas throughout Los Angeles County, and the mitigation strategies necessary to reduce risks, including seismic risk. The County’s All-Hazards Mitigation Plan is provided in Appendix E.

City of Glendora
2025 Water Shortage Contingency Plan

The California Geological Survey has published the locations of numerous faults which have been mapped in the Southern California region. Although the San Andreas fault is the most recognized and is capable of producing an earthquake with a magnitude greater than 8 on the Richter scale, some of the lesser-known faults have the potential to cause significant damage. The locations of these earthquake faults in the vicinity of the City’s water service area are provided in the figure below. The faults that are located in close proximity to and could potentially cause significant shaking in the City’s water service area include the San Andreas fault, the Walnut Creek fault, the San Jose fault, the Red Hill fault, the Raymond fault, the Cucamonga fault, the Sierra Madre fault, and the San Antonio fault.

Location of Earthquake Faults
Source: https://maps.conservation.ca.gov/cgs/fam/App/
The following figure provides the relative intensity of ground shaking in the vicinity of the City’s service area from anticipated future earthquakes. The locations of relatively longCity’s Service Area City of Glendora
2025 Water Shortage Contingency Plan

period (1.0 second) earthquake shaking, including the City’s service area, are provided.

Long-period shaking affects tall, relatively flexible buildings, but also correlates with earthquake damage. The shaking potential is calculated based on the level of ground motion that has a 2 percent chance of being exceeded in 50 years (or the level of groundshaking with an approximate 2,500-year average repeat time). As discussed in Section

4.5, the City has prepared an Emergency Response Plan which provides the management, procedures, and designated actions the City and its employees will implement during emergency situations resulting from natural disasters, including during earthquakes, to ensure that customers receive a reliable and adequate supply of potable water. The City’s ERP is incorporated by reference.

Earthquake Shaking Potential
Source: “Earthquake Shaking Potential for California,” 2016, California Geological Survey and United States Geological Survey

SHORTAGE RESPONSE ACTION EFFECTIVENESS
City of Glendora
2025 Water Shortage Contingency Plan

The effectiveness of the shortage response actions for each of the standard water shortage levels identified in Section 3 is evident in the City’s historical ability to meet its customer’s water demands in response to a water supply shortage. In addition, the City imposes water consumption regulations and restrictions and supports local agencies in efforts to enforce regulations and prohibitions on water use. The effectiveness of each of the City’s shortage response actions, in order to reduce any potential gaps between supply and demand, has been quantified in the expected demand reduction provided in Table 2 and Table 3.

During the past 5 years, the City experienced a consecutive two-year drought within its service area from FY 2021 to FY 2022. Throughout this extended dry year period, the City’s annual water production averaged 10,654 acre-feet per year (AFY). During the past five years, the average annual production was approximately 9,686 AFY, with a maximum of up to 11,094 AF during FY 2021. The City has been able to provide sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands. In addition, the City has been able to provide water service to meet maximum day water demands for these years, including during the summer months.

The City’s water demands during the most recent five years averaged approximately 8,373 AFY of potable water. Due to conservation efforts and demand management measures (discussed in Chapter 8 of the UWMP), the City’s recent water demands have been significantly less than its historical water demands, including during long-term droughts. The City’s projected water demands (during normal, single dry, and multiple dry years) are provided in Section 5.3 of the UWMP and are anticipated to incorporate similar reductions in water use rates as a result of the shortage response actions, ongoing conservation efforts, and demand management measures. It is anticipated the City will be able to continue providing sufficient water supplies to its customers to meet projected water demands, including during long-term droughts. In addition, as discussed in Section

4.1, based on historical and on-going management practices, the City will be able to continue relying on its water supply source from the Main Basin for adequate supply City of Glendora
2025 Water Shortage Contingency Plan

augmentation in response to each of the standard water shortage levels identified in Section 3.

Based on the City’s demonstrated ability to meet water demands during past water supply shortages, the adopted water shortage levels, the adjusted operating safe yields, and water supplies during long-term droughts, it is anticipated that the City will be able to provide sufficient water supplies to its customers during each of its standard water shortage levels. Although adequate supplies are anticipated, the cost of those water supplies may become incrementally more expensive. The City will enact varying stages of its WSCP to encourage retail customers to reduce water consumption and at the same time reduce the need to use the more expensive water supplies. Notwithstanding, the effectiveness of each of the City’s shortage response actions, in order to reduce any potential gaps between supply and demand, has been quantified in the expected demand reduction section provided in Table 2 and Table 3. The effectiveness of the TVMWD’s shortage response actions is based on the City’s water demands prior to 2015 (unconstrained demands). The City reduced its water demands in 2015 in response to the Governor’s April 1, 2015 Executive Order B-29-15 which mandated statewide reduction in water use of 25 percent. During this period, the City was able to reduce its water demands by approximately 33 percent. This historical water demand reduction was used to estimate the extent of water use reductions for the City’s Water Shortage Stages.

The City’s Water Shortage Stages 1, 2, 3, 4, 5, and 6 are expected to reduce water demands by up to 10%, 20%, 30%, 40%, 50%, and greater than 50%, respectively.

City of Glendora
2025 Water Shortage Contingency Plan

COMMUNICATION PROTOCOLS
________________________________________________________________________ CWC 10632.
(a)(5) Communication protocols and procedures to inform customers, the public, interested parties, and local, regional, and state governments, regarding, at a minimum, all of the following:
(A) Any current or predicted shortages as determined by the annual water supply and demand assessment described pursuant to Section 10632.1. (B) Any shortage response actions triggered or anticipated to be triggered by the annual water supply and demand assessment described pursuant to Section 10632.1. (C) Any other relevant communications.
________________________________________________________________________ Using the same procedure established under the City’s Ordinance 1925, the City Council will hold a public hearing for the purposes of determining whether a need to implement a Stage 1, Stage 2, Stage 3, Stage 4, Stage 5, or Stage 6 Water Supply Shortage exists.

Notice of the time and place of this public hearing will be published no less than 10 days before the hearing in a daily newspaper of general circulation within the City. Upon finding that a need to implement a Stage 1 through Stage 6 Water Supply Shortage exists, the City Council will order implementation of the appropriate water shortage condition, or other measures which it deem appropriate to address the water shortage. The order will be made by Resolution and will be published one time only in a daily newspaper of general circulation and will become effective immediately following publication. The appropriate regulations that fall under the Stage Level declared will take effect with the first full billing period commencing on or after the effective date of the City Council's Resolution. Once a Water Supply Shortage stage is implemented, consumers will receive notification through water bill inserts, flyers sent in the mail, social media postings, and postings made on the City’s website.

At any time during the water shortage condition period, the City Council may discontinue the Stage Level or may implement another Stage Level described in the City’s WSCP.

City of Glendora
2025 Water Shortage Contingency Plan

Once the City Council finds that a water shortage condition no longer exists, the Stage Level that has been implemented will no longer be in effect.

Using the same procedure established under the City’s Urgency Ordinance 1996, if the City Council finds that a water shortage emergency exists, the City Council may order a Stage 6 Water Supply Shortage Level, or other measures which it deems appropriate to address the water shortage emergency. The order will be made by Resolution and shall be published one time only in a daily newspaper of general circulation within the City.

Upon the effective date of the City Council’s Resolution, the Stage 6 Water Shortage Level and its regulations will take effect immediately.

At any time during the Stage 6 water shortage condition period, the City Council may discontinue the Stage 6 or may implement another Stage Level describe in the City’s WSCP. Once the City Council finds that a Stage 6 water shortage condition no longer exists, the Stage Level will no longer be in effect.

City of Glendora
2025 Water Shortage Contingency Plan

COMPLIANCE AND ENFORCEMENT
________________________________________________________________________ CWC 10632.
(a)(6) For an urban retail water supplier, customer compliance, enforcement, appeal, and exemption procedures for triggered shortage response actions as determined pursuant to Section 10632.2.
________________________________________________________________________ The City will enforce the six standardized shortage response actions through the provisions established under the City’s ordinances.

Under the City’s Ordinance 1895, any customer violating the regulations and restrictions on water use set forth in the Ordinance will receive a written warning for the first such violation of Stage 1, Stage 2, Stage 3, Stage 4, or Stage 5 prohibitions. Upon a second violation within the preceding 12 consecutive months, the customer will receive a fine in an amount consistent with violation penalties set forth in Chapter 14.34 of the Glendora Municipal Code. For a third violation within the preceding 12 consecutive months, the customer will receive a fine in an amount consistent with violation penalties set forth in Chapter 14.34 of the Glendora Municipal Code. For a fourth (or more) violation within the preceding 12 consecutive months, the customer’s violation will be punishable as a misdemeanor and the customer will receive a fine in an amount consistent with violation penalties set forth in Chapter 14.34 of the Glendora Municipal Code. Violations of Stage 1, Stage 2, Stage 3, Stage 4, or Stage 5 prohibitions may result in the City installing a flow-restrictor on the water service. If a flow-restrictor is placed, the customer will pay the cost of the installation and removal. If water service is disconnected, it will be restored only upon payment by the customer of the turn-on charge fixed by the City Council. A copy of City Ordinance 1895 is provided in Appendix A.

The City approved an Emergency Drought Response Plan (EDRP) on May 26, 2015. The EDRP describes the penalties for violating the Urgency Ordinance 1996, which established water use prohibitions during an emergency drought condition. As mentioned City of Glendora
2025 Water Shortage Contingency Plan

in Section 4.2, the City considers an emergency drought condition as the Stage 6 water shortage level. The first violation will result in a written warning. The violation notice shall specify the nature of the violation(s), the date on which it occurred, the corrective measures to be performed, and notice that the violator shall: (A) Perform the corrective action; (B) Request a water use efficiency audit with the city within ten days; and, (C) Undertake the relevant corrective action within ten days after completion of the water use efficiency audit. Upon the second violation, the customer will be subject to a fine in an amount consistent with violation penalties set forth in Chapter 14.34 of the Glendora Municipal Code. For a third violation or more within twelve months, the customer will be subject to a fine in an amount consistent with violation penalties set forth in Chapter 14.34 of the Glendora Municipal Code. Violations of the emergency water drought regulations may result in the City installing a flow restrictor on the service to the property.

LEGAL AUTHORITIES
________________________________________________________________________ CWC 10632.
(a)(7)(A) A description of the legal authorities that empower the urban water supplier to implement and enforce its shortage response actions specified in paragraph (4) that may include, but are not limited to, statutory authorities, ordinances, resolutions, and contract provisions.
(B) A statement that an urban water supplier shall declare a water shortage emergency in accordance with Chapter 3 (commencing with Section 350) of Division 1. (C) A statement that an urban water supplier shall coordinate with any city or county within which it provides water supply services for the possible proclamation of a local emergency, as defined in Section 8558 of the Government Code.

CWC Division 1, Section 350
The governing body of a distributor of a public water supply, whether publicly or privately owned and including a mutual water company, shall declare a water shortage emergency condition to prevail within the area served by such distributor whenever it finds and determines that the ordinary demands and requirements of water consumers cannot be satisfied without depleting the water supply of the distributor to the extent that there would be insufficient water for human consumption, sanitation, and fire protection. ________________________________________________________________________ City of Glendora
2025 Water Shortage Contingency Plan

Under the City’s Ordinance 1895 and Ordinance 1925, the City Council has the legal authority to call a public hearing to discuss the need to declare and implement a Stage 1, Stage 2, Stage 3, Stage 4, or Stage 5 water shortage. Upon finding that a water shortage condition exists, the City Council will adopt a Resolution declaring the appropriate water shortage response action to mitigate the existing drought condition.

Through the City’s Urgency Ordinance 1996, the City Council has the authority to declare an emergency water shortage upon finding that one exists. Under this ordinance, the City Council may adopt a resolution that would place a Stage 6 water shortage response into effect without the need of hold a public hearing.

The City shall declare a water shortage emergency in accordance with CA Water Code CHAPTER 3 - Water Shortage Emergencies § 350 – 358.

Legal authorities include California Water Code Sections 71640-71644 Article 3. Water Shortages and CA Water Code § 366 (2025) CHAPTER 3.3 - Excessive Residential Water Use During Drought. The City will coordinate with any city or county within which it provides water for the possible proclamation of a local emergency.

FINANCIAL CONSEQUENCES OF WSCP
________________________________________________________________________ CWC 10632.
(a)(8) A description of the financial consequences of, and responses for, drought conditions, including, but not limited to, all of the following:
(A) A description of potential revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4). (B) A description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4).
(C) A description of the cost of compliance with Chapter 3.3 (commencing with Section 365) of Division 1.
________________________________________________________________________ City of Glendora
2025 Water Shortage Contingency Plan

To ensure compliance with CWC Chapter 3.3 (commencing with Section 365), additional costs may be incurred to monitor and enforce WSCP actions. These costs may vary depending on the applicable water shortage stage and the duration of the water shortage emergency.

Potential revenue reductions and expense increases associated with activated shortage response actions are regulated and tracked by the City’s Finance Division.

The City’s primary source of revenue is user service charges, which consists of bi-monthly fixed readiness-to-serve charges according to meter size and a volumetric charge per unit of water consumed. The bi-monthly fixed readiness-to-serve charges are sufficient to meet about 50 percent of the City’s fixed expenses. The revenue from the consumption charge is designed to be sufficient to fund the remaining 50 percent of the fixed expenses plus all of the variable expenses associated with the cost of water. The current water rates are provided in Appendix F.

Consumption Rates include components for Tiered Rates and Elevation Rates. The City implements a four (4) consumption tier rate structure to promote water conservation. The Elevation Rate component is broken up by four (4) zone classes, which were established to assign the costs fairly and equitably.

The City anticipates potential impacts on expenditures associated with operations. An increase in staff cost may be triggered by salaries and benefits for new hires required to administer and implement the WSCP. Necessary alternative sources of water supply may also increase operations and maintenance costs. Additionally, a new water supply source would increase the cost of supply and treatment.

The City has historically maintained a financial reserve in its Water Fund. The City may use financial reserves for water system expenditures to make up for shortfalls in water revenue associated with unanticipated reduced water sales for a transient period.

City of Glendora
2025 Water Shortage Contingency Plan

In 2023, the City approved a water rate structure with certain automatic adjustments relating to third-party costs incurred in the operation of the City’s water system and the normal cost of living or Consumer Price Index (CPI) inflation adjustment, not to exceed 5 percent. These automatic adjustments are necessary to keep the water operations solvent and financially sound. They allow for the recovery of actual costs for energy purchased from Southern California Edison and the City of Azusa Power, along with any water purchased from MWD through TVMWD. The approved rate structure allows adjustments, if necessary, based on actual costs incurred. The City will provide notification to customers in advance of any rate change before implementation.

MONITORING AND REPORTING
________________________________________________________________________ CWC 10632.
(a)(9) For an urban retail water supplier, monitoring and reporting requirements and procedures that ensure appropriate data is collected, tracked, and analyzed for purposes of monitoring customer compliance and to meet state reporting requirements. ________________________________________________________________________ Customer compliance of the provisions adopted by declaration of a WSCP is monitored through the City’s water waste enforcement program and advanced metering infrastructure (AMI). Staff track violations, investigations, violation notices, and penalties for non-compliance with the WSCP, and it is reported through the monthly Urban Water Supplier Reports. In addition, the City offers a Smart Water Meter Program utilizing AMI technology that allows customers to self-monitor their water use in real time with customer notifications on leaks and high usage.

WSCP REFINEMENT PROCEDURES
________________________________________________________________________ CWC 10632.
(a)(10) Reevaluation and improvement procedures for systematically monitoring and evaluating the functionality of the water shortage contingency plan in order to ensure City of Glendora
2025 Water Shortage Contingency Plan

shortage risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented as needed.
________________________________________________________________________ The City’s WSCP has been prepared as an adaptive management plan. As discussed in Section 9, the City will monitor and report on the implementation of the WSCP. The City will review the implementation results for any current or potential shortage gaps between water supplies and demands. The City will evaluate the need for revising the WSCP in order to resolve any shortage gaps, as necessary. The City will consider the following potential revisions in the event of a potential shortage gap:
• Implementation of additional public outreach, education, and communication programs (in addition to the programs discussed in Chapter 8 of the UWMP). • Implementation of more stringent water use restrictions under the standard water shortage levels (discussed in Section 4.1).
• Implementation of stricter enforcement actions and penalties (discussed in Section 6).
• Improvements to the water supply augmentation responses (discussed in Section

4.2), as well as any associated operational changes (discussed in Section 4.3) which may be required.
• Incorporation of additional actions recommended by City staff or other interested parties.

The City will use the monitoring and reporting data to evaluate the ability of these potential revisions to resolve any shortage gaps that may occur within the standard water shortage levels.

This WSCP is adopted as part of the City’s 2025 UWMP adoption process discussed in Section 9.2 of the UWMP. It is anticipated that the City will review, revise, and adopt an updated WSCP as part of the 2030 UWMP, as necessary. However, the City will continue City of Glendora
2025 Water Shortage Contingency Plan

to review the monitoring and reporting data, and if needed, update the WSCP more frequently. Any updates to the City’s WSCP will include a public hearing and adoption process by the City Council (see Section 12).

City of Glendora
2025 Water Shortage Contingency Plan

SPECIAL WATER FEATURE DISTINCTION
_______________________________________________________________________ CWC 10632.
(b) For purposes of developing the water shortage contingency plan pursuant to subdivision (a), an urban water supplier shall analyze and define water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas, as defined in subdivision (a) of Section 115921 of the Health and Safety Code.
________________________________________________________________________ The City’s WSCP defines “decorative water features” as water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, but excluding pools and spas. In general, there are additional health and safety considerations in the water supplied to pools and spas compared to decorative water features. As a result, the City’s WSCP has reviewed the response actions, enforcement actions, and monitoring and reporting programs separately for decorative water features and for pools and spas, as applicable.

PLAN ADOPTION, SUBMITTAL, AND AVAILABILITY
_______________________________________________________________________ CWC 10632.
(c) The urban water supplier shall make available the water shortage contingency plan prepared pursuant to this article to its customers and any city or county within which it provides water supplies no later than 30 days after adoption of the water shortage contingency plan.

CWC 10635.
(c) Provide supporting documentation that Water Shortage Contingency Plan has been, or will be, provided to any city or county within which it provides water, no later than 30 days after the submission of the plan to DWR.
________________________________________________________________________ The City’s WSCP is adopted as part of the City’s 2025 UWMP adoption process discussed in Chapter 9 of the UWMP. The process for adopting the City’s WSCP includes the following:

City of Glendora
2025 Water Shortage Contingency Plan

• The City will conduct a public hearing and make the WSCP available for public inspection.
• The City will provide notification of the time and place of the public hearing to any city or county in which water is provided.
• The City will publish notice of public hearing in a newspaper once a week, for two successive weeks (with at least five days between publication dates). • The City Council will adopt the 2025 UWMP and the WSCP. • As part of submitting the 2025 UWMP to DWR, the City will also submit the WSCP (electronically through DWR’s online submittal tool) within 30 days of adoption and by July 1, 2026. The City will submit a copy of the WSCP to the California State Library and to any city or county in which water is provided within 30 days of adoption. In addition, the City will make the WSCP available for public review within 30 days of adoption.

If there are any subsequent amendments required, the process for adopting an amended WSCP includes the following:
• The City will conduct a public hearing and make the amended WSCP available for public inspection.
• The City Council will adopt the amended WSCP.
• The City will submit the amended WSCP to DWR (electronically through DWR’s online submittal tool) within 30 days of adoption.
• Per 10635(c), Within 30 days after submission of the WSCP to DWR, the City will provide the WSCP to any city or county within which they provide water.

Additional information regarding the adoption, submittal, and availability of the City’s WSCP (and 2025 UWMP) is provided in Chapter 9 of the UWMP.

APPENDIX A
ORDINANCE 1895

APPENDIX B
ORDINANCE 1925

APPENDIX C
URGENCY ORDINANCE 1996

APPENDIX D
CITY OF GLENDORA’S HAZARD MITIGATION PLAN
City of Glendora
Local Hazard Mitigation Plan
Public Review Draft
March 2025

PUBLIC REVIEW DRAFT

CITY OF GLENDORA

LOCAL HAZARD MITIGATION PLAN

CITY OF GLENDORA
150 S Glendora Avenue
Glendora, CA 91741
Contact: Julie Linger, Business Services Manager
Glendora Police Department
Prepared by:

DE NOVO PLANNING GROUP
180 E. Main Street, Suite 108
Tustin, California 92870
Contact: Starla Barker, AICP
(949) 396-8193
March 2025

Glendora Local Hazard Mitigation Plan
i | Page Table of Contents

TABLE OF CONTENTS
Section 1.0 Introduction ....................................................................................................... 1-1

1.1 Plan Purpose............................................................................................................... 1-1

1.2 Plan Authority.............................................................................................................. 1-2

1.3 Plan Adoption.............................................................................................................. 1-3

1.4 Plan Organization........................................................................................................ 1-3

1.5 Mitigation Goals........................................................................................................... 1-4

1.6 Updated Community Priorities ..................................................................................... 1-5 Section 2.0 Planning Process .............................................................................................. 2-1

2.1 Forming The Planning Team ....................................................................................... 2-1

2.2 Assess Risks............................................................................................................. 2-10

2.3 Develop Mitigation Plan............................................................................................. 2-11 Section 3.0 Community Profile ............................................................................................ 3-1

3.1 Geography and Environment....................................................................................... 3-1

3.2 Climate........................................................................................................................ 3-1

3.3 History......................................................................................................................... 3-2

3.4 Demographics ............................................................................................................. 3-5

3.5 Land Uses and Existing Development ......................................................................... 3-8

3.6 Development Trends and Future Development ......................................................... 3-15

3.7 Infrastructure Systems............................................................................................... 3-19 Section 4.0 Risk and Vulnerability Assessment ................................................................. 4-1

4.1 Hazard Identification.................................................................................................... 4-1

4.2 Hazard Profiles............................................................................................................ 4-4 Dam/Reservoir Failure................................................................................................. 4-4 Drought ..................................................................................................................... 4-12 Flood ...................................................................................................................... 4-19 Seismic and Geologic Hazards.................................................................................. 4-27 Severe Weather ........................................................................................................ 4-42 Wildfire ...................................................................................................................... 4-51

4.3 Vulnerability/Risk Assessment................................................................................... 4-58 History of Disasters and Other Declarations .............................................................. 4-58 Methodology.............................................................................................................. 4-61 Critical Facilities and Facilities of Concern................................................................. 4-63 Vulnerable Populations.............................................................................................. 4-70 Glendora Local Hazard Mitigation Plan
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Vulnerability Assessment........................................................................................... 4-79 Section 5.0 Hazard Mitigation Strategy ............................................................................... 5-1

5.1 Capabilities Assessment ............................................................................................. 5-1

5.2 Hazard Mitigation Overview......................................................................................... 5-9

5.3 Hazard Mitigation Actions.......................................................................................... 5-13 Section 6.0 Plan Maintenance .............................................................................................. 6-1

6.1 Method and Schedule for Maintaining and Updating the Plan...................................... 6-1

6.2 Adoption...................................................................................................................... 6-5

6.3 Incorporation Into Existing Programs and Planning Mechanisms................................. 6-5

6.4 Continued Public Involvement ..................................................................................... 6-7

6.5 Point of Contact........................................................................................................... 6-8 Section 7.0 References......................................................................................................... 7-1 Glendora Local Hazard Mitigation Plan
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LIST OF APPENDICES
Appendix A City Adoption Resolution
Appendix B Planning Process Documentation
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LIST OF FIGURES
Figure 1-1: Disaster Response Cycle...................................................................................... 1-2 Figure 3-1: Regional Vicinity ................................................................................................... 3-3 Figure 3-2: City and Sphere of Influence................................................................................. 3-4 Figure 3-3: General Plan Land Use Map................................................................................. 3-9 Figure 3-4: Housing Element Sites Inventory ........................................................................ 3-18 Figure 4-1: Dam Inundation Areas ........................................................................................ 4-10 Figure 4-2: Drought Monitor Map .......................................................................................... 4-15 Figure 4-3: U.S. Seasonal Drought Outlooks ........................................................................ 4-18 Figure 4-4: Flood Hazard Zones ........................................................................................... 4-22 Figure 4-5: Types of Faults ................................................................................................... 4-27 Figure 4-6: Regional Fault Map............................................................................................. 4-31 Figure 4-7: Earthquake Shaking Potential............................................................................. 4-33 Figure 4-8: Landslide Hazard Zones ..................................................................................... 4-35 Figure 4-9: Liquefaction Hazard Zones ................................................................................. 4-39 Figure 4-10: Heat Index ........................................................................................................ 4-47 Figure 4-11 Fire Hazard Severity Zones................................................................................ 4-53 Figure 4-12: Glendora Critical Facilities and Facilities of Concern......................................... 4-69 Figure 4-13: Overall SVI........................................................................................................ 4-74 Figure 4-14: Socioeconomic SVI........................................................................................... 4-75 Figure 4-15: Household Characteristics ................................................................................ 4-76 Figure 4-16: Racial and Ethnic Minority Status...................................................................... 4-77 Figure 4-17: Housing Type/Transportation............................................................................ 4-78 Glendora Local Hazard Mitigation Plan
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LIST OF TABLES
Table 2-1: DMA 2000 CFR Crosswalk .................................................................................... 2-1 Table 2-2: LHMP Planning Team ............................................................................................ 2-4 Table 2-3: Planning Team Meeting Summary ......................................................................... 2-5 Table 2-4: Primary Plan Resources....................................................................................... 2-10 Table 3-1: Glendora and Los Angeles County Population and Housing Data (2022)............... 3-5 Table 3-2: Glendora and Los Angeles County Racial and Ethnic Composition (2022)............. 3-6 Table 3-3: Glendora and Los Angeles County Educational Attainment (2022) ........................ 3-6 Table 3-4: Glendora and Los Angeles County Household Characteristics (2022) ................... 3-7 Table 3-5: Land Use Designations ........................................................................................ 3-11 Table 3-6: Glendora Development Capacity (2025) .............................................................. 3-14 Table 3-7: Major Development Projects ................................................................................ 3-16 Table 3-8: Glendora RHNA Allocation (2021-2029)............................................................... 3-17 Table 4-1: Glendora Hazard Identification............................................................................... 4-2 Table 4-2: Dams With Inundation Areas Affecting Glendora.................................................... 4-9 Table 4-3: Dam Failures in Southern California..................................................................... 4-11 Table 4-4: Drought Severity Classification............................................................................. 4-14 Table 4-5: Historical Droughts............................................................................................... 4-16 Table 4-6: Acreage by FEMA Flood Zones ........................................................................... 4-23 Table 4-7: The Modified Mercalli Intensity Scale ................................................................... 4-34 Table 4-8: Major Earthquake Faults of Particular Concern .................................................... 4-37 Table 4-9: Significant Historical Earthquakes in Southern California ..................................... 4-38 Table 4-10: Los Angeles Region Earthquake Possibilities..................................................... 4-41 Table 4-11: Likelihood of Earthquakes Occurring in the Next 30 Years in Los Angeles County Region by Fault.............................................................. 4-41 Table 4-12: Saffir-Simpson Hurricane Wind Scale ................................................................ 4-46 Table 4-13: Major Wildfires in Recent Los Angeles County History....................................... 4-54 Table 4-14: Los Angeles County FEMA Disaster Declarations (2014-2025).......................... 4-59 Table 4-15: California State Disaster Declarations for Los Angeles County (2014-2025) ...... 4-61 Glendora Local Hazard Mitigation Plan
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Table 4-16: Glendora Critical Facilities and Facilities of Concern.......................................... 4-65 Table 4-17: Social Vulnerability Index ................................................................................... 4-71 Table 4-18: Critical Facilities In Dam Inundation Areas ......................................................... 4-79 Table 4-19: Critical Facilities In a Landslide Zone ................................................................. 4-86 Table 4-20: Critical Facilities In a Liquefaction Zone ............................................................. 4-86 Table 4-21: Critical Facilities In Fire Hazard Zone................................................................. 4-89 Table 4-22: Risk Assessment Summary................................................................................ 4-91 Table 5-1: Capabilities Assessment ........................................................................................ 5-2 Table 5-2: STAPLEE/E Review and Selection Criteria .......................................................... 5-12 Table 5-3: Status of Previous Plan Hazard Mitigation Actions............................................... 5-15 Table 5-4: Hazard Mitigation Actions..................................................................................... 5-19 Glendora Local Hazard Mitigation Plan
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Section 1.0 | Introduction
Natural disasters can cause death and injuries, as well as significant damage to communities, businesses, public infrastructure, and the environment. Each year, natural disasters take the lives of hundreds of people and injure thousands more, and taxpayers pay billions of dollars annually to help recovery efforts. After disasters, repairs and reconstruction are often completed to simply restore the affected areas to their pre‐disaster conditions. Such efforts expedite a return to normalcy; however, the replication of pre‐disaster conditions results in a cycle of damage, reconstruction, and repeated damage. As the cost of damage from natural disasters continues to increase, communities realize the importance of identifying effective ways to reduce vulnerability to disasters. While it is not possible to prevent disasters from happening, their effects can be reduced or eliminated through well-organized public education and awareness efforts, preparedness, and mitigation. For those hazards that cannot be fully mitigated, the community must be prepared to provide efficient and effective response and recovery.

It is impossible to predict exactly when and where disasters will occur or the extent to which they will impact a community. However, with careful planning and collaboration among public agencies, stakeholders, and citizens, it is possible to minimize losses that may occur from disasters. Proactive mitigation planning helps reduce the cost of disaster response and, by protecting critical community facilities, reducing liability exposure, and minimizing overall community impacts and disruption. For hazards that can be mitigated, the City should be prepared to implement efficient and effective short- or long-term actions where needed.

The City of Glendora developed their Local Hazard Mitigation Plan (“LHMP” or “Plan”) to reduce future loss of life and property resulting from disasters, and to provide increased resiliency, allowing the City to return to normal sooner, with fewer impacts to people, facilities, and infrastructure. This LHMP is an update to the City of Glendora 2015 Natural Hazard Mitigation Plan.

1.1 PLAN PURPOSE
The purpose of the LHMP is to provide the City with clear direction for hazard mitigation action planning. This LHMP identifies natural and human-induced hazards that threaten the community and provides resources, information, and strategies to reduce these threats, resulting in overall risk reduction.

This plan focuses on the mitigation component of the cycle shown in Figure 1.1, Disaster Response Cycle. Hazard mitigation plays an important role in reducing the impacts of disasters by identifying effective and feasible actions to reduce the risks posed by potential hazards. The City is updating this plan to be consistent with current standards and regulations, ensuring that Glendora Local Hazard Mitigation Plan
1-2 | Page Introduction
the understanding of hazards facing its
community reflects best available
information and current conditions.

The LHMP does not supersede current City
plans or strategies (such as the General
Plan); rather it enhances the ability to
identify, inform and mitigate hazard risks
unique to the City. Information in this plan will
be used to help guide and coordinate
mitigation activities and serve as a tool for
decision-makers to direct mitigation activities
and resources.

1.2 PLAN AUTHORITY

FEDERAL REQUIREMENTS
The Robert T. Stafford Disaster Relief and Emergency Act (Stafford Act), as amended by the Disaster Mitigation Act of 2000 (DMA 2000), governs hazard mitigation planning activities like this one. While cities are not mandated to prepare a LHMP, the Stafford Act requires state, local, and tribal governments seeking federal hazard mitigation grant funds to submit a plan that outlines processes for identifying hazards, risks, and vulnerabilities (United States Code [USC] Title 42, Section 5156[a]). To implement the hazard mitigation planning requirements of the Stafford Act, the Federal Emergency Management Agency (FEMA) has issued regulations under Code of Federal Regulations (CFR) Title 44, Part 201. These regulations guide the planning process, content, and approval for hazard mitigation plans. This LHMP complies with the Stafford Act, DMA 2000, and the relevant sections of Title 44 CFR, including Parts 201, 206, and 322.

STATE REQUIREMENTS
California Government Code Section 8685.9 (Assembly Bill [AB] 2140) limits the State's share of disaster relief funds to 75 percent of the amount not covered by federal disaster relief, unless the jurisdiction has adopted a valid hazard mitigation plan that meets DMA 2000 standards. This plan must be incorporated into the jurisdiction’s general plan, which can be done through a resolution adopting the LHMP.

The City of Glendora is concurrently updating its General Plan Safety Element, which covers a range of hazards, including geological (seismic and soils), flooding, dam inundation, hazardous materials, fire risks, crime, medical emergencies, aircraft overflight, and climate change resilience.

It also addresses disaster preparedness and community safety, ensuring coordination during disaster response situations.

Figure 1-1 Disaster Response Cycle
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This LHMP is consistent with current federal and State standards, as outlined by the Governor’s Office of Emergency Services (CAL OES) and FEMA. It uses the best available information, reflects best practices, and aligns with community values. To comply with AB 2140, the City aims to meet all relevant federal and State requirements, ensuring Glendora is eligible for the appropriate benefits.

Once FEMA issues an Approvable Pending Adoption (APA) notification, the City will formally adopt the LHMP and incorporate it into the Safety Element of the General Plan via resolution. The General Plan Safety Element will reference the LHMP and provide information on how the public can access the current, approved version. Compliance with AB 2140 will be determined by CAL OES.

1.3 PLAN ADOPTION
The previous iteration of the LHMP was approved by Cal OES and FEMA in 2015, and this document serves as a comprehensive update in accordance with recent State and federal regulations. Following FEMA approval, the City Council of Glendora formally adopts the 2025 LHMP as an update to the 2015 LHMP. A copy of the resolution will be provided in Appendix A.

1.4 PLAN ORGANIZATION
The LHMP is organized into the following sections to reflect the logical progression of activities undertaken to develop the plan and includes all relevant documentation required to meet the necessary criteria for FEMA approval. Each section is briefly described below:

Section 1.0: Introduction describes the background and purpose of the plan, as well as the authority established for its development.

Section 2.0: Planning Process describes the LHMP update planning process, as well as the meetings and outreach activities undertaken to engage partner agencies, stakeholders, and the public.

Section 3.0: Community Profile provides the history, geography, and demographics of Glendora, including land use and development trends.

Section 4.0: Risk and Vulnerability Assessment identifies and profiles the natural hazards affecting the City, including their history, risk of future occurrence, and any effects climate change has on their frequency and intensity, where applicable. The selection and confirmation of hazards are also discussed. This section also identifies the vulnerability and risk to the community, including vulnerable populations, and critical facilities associated with each hazard.

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Section 5.0: Hazard Mitigation Strategy identifies the specific hazard mitigation actions to reduce potential risks to the City’s critical facilities, residents, and business owners to improve resiliency, and assesses the City’s capabilities to implement and achieve the mitigation actions.

Section 6.0: Plan Maintenance discusses implementation of the plan, including the process to monitor, evaluate, update, and maintain the LHMP, and identifies opportunities for continued public involvement.

Section 7.0: References identifies the various resources utilized throughout development of the LHMP.

1.5 MITIGATION GOALS
The following goals from the 2015 Natural Hazard Mitigation Plan have been reconfirmed, with minor modifications, as part of the update to the Glendora LHMP:
 Protect Life and Property. Implement activities that assist in protecting lives by making homes, businesses, infrastructure, critical facilities, and other property more resistant to losses from natural hazards.
 Enhance Public Awareness. Develop and implement education and outreach programs to increase public awareness of the risks associated with natural hazards. Provide information on tools; partnership opportunities, and funding resources to assist in implementing mitigation activities that reduces vulnerabilities.
 Preserve Natural Systems. Support management and land use planning practices with hazard mitigation to protect life. Preserve, rehabilitate, and enhance natural systems to serve hazard mitigation functions.
 Encourage Partnerships and Implementation. Strengthen communication and coordinate participation with public agencies, citizens, non-profit organizations, and businesses to support implementation. Encourage leadership within the City and public organizations to prioritize and implement local and regional hazard mitigation activities.  Strengthen Emergency Services. Establish policy to ensure mitigation projects for critical facilities, services, and infrastructure are prioritized. Strengthen emergency operations by increasing collaboration and coordination among public agencies, non-profit organizations, and businesses. Coordinate and integrate hazard mitigation activities where appropriate, with emergency operations plans and procedures.

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1.6 UPDATED COMMUNITY PRIORITIES
The priorities of the City relative to hazard mitigation remain similar to those in the 2015 LHMP.

The mitigation goals were reviewed by the Planning Team and determined to be relevant with minor revisions to provide clarity and communicate priorities relative to hazard mitigation that reduces vulnerabilities.

The Community Profile was updated to reflect current demographic data and recent updates to the Glendora General Plan Housing Element. Major development projects have been identified, demonstrating continued growth and development/redevelopment within the City. Potential development to reflect the City’s 2021-2029 Housing Element, which was required to include an inventory of land suitable and available for residential development to meet the City’s regional housing need allocation (RHNA) of 2,276 units is identified. As part of the identification of sites, environmental constraints, including natural hazards were considered. The sites identified to accommodate the RHNA are primarily comprised of underutilized and vacant sites located within existing Specific Plans in proximity to transportation, and other urbanized areas. These sites are located within an area of the City considered to have reduced vulnerabilities specific to natural hazards.

The planning process for the update included a Project Management Team, led by the Business Services Manager of the Glendora Police Department who coordinated with the Principal Planner in the City’s Planning Division relative to the LHMP and Safety Element Update. A Planning Team, comprised of City departments, neighboring cities, emergency responders, healthcare providers, school districts, utility providers, and other partner agencies, provided oversight and information specific to the LHMP update.

A comprehensive approach to community outreach was a primary focus of the Project Management Team. The outreach included a community survey, community outreach event, and six focus group meetings to provide expanded outreach to vulnerable populations. Discussions with the Planning Team and the results of the community survey and outreach indicate the community continues to be concerned with the hazards addressed within the LHMP. The hazards were expanded to include severe weather, consisting of Santa Ana winds and heavy rainstorms, and drought. The remaining hazards were updated to reflect changes since preparation of the 2015 LHMP.

The LHMP update includes a reorganization from the previous plan with a modernized template, structure, and framework for clarity and to streamline the plan. An expanded vulnerability assessment is included in the LHMP update to address vulnerable populations. Similarly, the mitigation strategy was updated to consider specific populations and areas of the City determined to experience higher vulnerability in the event of a hazard event. The mitigation actions were also revised to reflect mitigation actions that have been completed and identify priorities.

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Section 2.0 | Planning Process
This section describes each stage of the planning process used to develop the LHMP. The LHMP planning process provides a framework to document the plan’s development and follows FEMArecommended steps. The LHMP follows a prescribed series of planning steps which includes organizing resources, assessing risk, developing the mitigation plan, drafting the plan, reviewing and revising the plan, and adopting and submitting the plan for approval. Each step is described in this section.

Hazard mitigation planning in the United States is guided by statutory regulations described in the DMA 2000 and implemented through Title 44 CFR Parts 201 and 206. FEMA’s hazard mitigation plan guidelines outline a four-step planning process for the development and approval of hazard mitigation plans. Table 2-1, DMA 2000 CFR Crosswalk, lists the specific CFR excerpts that contain the requirements for approval, and identifies the applicable section of this LHMP.

TABLE 2-1: DMA 2000 CFR CROSSWALK
DMA 2000 (44 CCFR 201.6) Glendora LHMP Section
(1) Organize Resources Section 2
201.6(c)(1) Organize to prepare the plan
201.6(b)(1) Involve the public
201.6(c)(2) and (3) Coordinate with other agencies
(2) Assess Risks Section 4
201.6(c)(2)(i) Assess the hazard
201.6(c)(2)(ii) and (iii) Assess the problem
(3) Develop the Mitigation Plan Section 5
201.6(c)(3)(i) Set goals (Section 1)
201.6(c)(3)(ii) Review possible activities (actions)
201.6(c)(3)(iii) Draft an action plan
(4) Plan Maintenance Section 6
201.6(c)(5) Adopt the plan
201.6(c)(4) Implement, evaluate, and revise

2.1 FORMING THE PLANNING TEAM

PROJECT MANAGEMENT TEAM
The City of Glendora engaged De Novo Planning Group to assist in developing the Local Hazard Mitigation Plan (LHMP). A core Project Management Team, composed of City staff and the Consultant Team, was formed to oversee the organization, facilitation, and execution of the LHMP development process. This team was responsible for the day-to-day coordination of the LHMP work program. Key tasks included forming and assembling the Planning Team, scheduling and organizing Planning Team meetings, preparing and distributing meeting materials, coordinating community engagement activities and meetings, and managing document reviews.

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LHMP PLANNING TEAM
The Project Management Team identified a list of participants, which included City staff, adjacent jurisdictions, partner agencies, service providers, and organizations, as potential LHMP Planning Team members. City Staff Planning Team members represented the following City Departments:
 Community Development
 Public Works
 Police Department
 Risk Management
 Human Resources
An invitation was sent via email to individuals advising them of the City’s efforts to prepare an LHMP and requesting their participation in preparation of the plan, including an invitation for participation in the Planning Team meetings. The invitation included a request to identify a potential alternate if the specific contact was unable to participate, a copy of the correspondence is included in Appendix B. An invitation was sent to the following agencies and organizations:
 City of Azusa
 City of Covina
 City of San Dimas
 Los Angeles County Fire
 Los Angeles County Area D Disaster Management
 U.S. Forest Service
 Foothill Gold Line
 Los Angeles County Public Works (Flood)
 Southern California Edison
 Southern California Gas Company
 Emanate Health
 Pomona Valley Hospital
 Red Cross
 Glendora Unified School District
 Charter Oak Unified School District
 St. Lucy’s Priory High School
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 Citrus College
 Azusa Pacific University
The City received responses from some agencies and organizations expressing interest in participating directly on the Planning Team, and others indicating their inability to participate but willingness to provide information.

Together, the Planning Team worked to ensure the success of the planning process. The team’s key roles and responsibilities included:
 Participation in Planning Team meetings
 Collection of local information and other requested data  Providing agency-specific knowledge and input
 Assistance with the public engagement process
 Decision on plan process and content
 Development and prioritization of mitigation actions
 Review and comment on the draft LHMP
Table 2-2, LHMP Planning Team, identifies the Planning Team members that directly participated in the Planning Team meetings and their roles in the LHMP development process.

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TABLE 2-2: LHMP PLANNING TEAM
Organization Name, Title
City of Glendora Project Management Team
City of Glendora Police Department Julie Linger, Public Safety Management Analyst LHMP Lead
City of Glendora Planning Division Hans Friedel, AICP, Principal Planner General Plan Safety Element Lead
City of Glendora
City of Glendora Public Works Jessica Clark, Business Services Manager City of Glendora Risk Management Marie Ricci, Administrative Services Director City of Glendora Human Resources Rita Wendling, Interim Assistant Director City of Glendora Police Department Matt Egan, Police Chief City of Glendora Police Department Mike Randazzo, Police Captain City of Glendora Police Department Chris Stabio, Police Captain Neighboring Cities
City of Azusa Jennifer Wu, Emergency Manager
City of San Dimas Anissa Livas, Senior Administrative Analyst Emergency Service Providers
Los Angeles County Fire Noble Robinson, Battalion Chief Los Angeles County Fire Mike Inman, Assistant Fire Chief Utility/Infrastructure Service Providers
Southern California Gas Company Ms. O’Shields, Public Affairs Manager Hospitals/Health Care Agencies
Pomona Valley Hospital Steven Storbakken
Emanate Health Angela Sharma
School Districts
Glendora Unified School District Tamra Fry, Safety/Risk Compliance Officer Charter Oak Unified School District Bob Lind, Director of Maintenance and Operations Charter Oak Unified School District Nate Cabibil, Maintenance Supervisor Community Partners
Red Cross Nahomi Rodriguez
Red Cross Ryan Chan, Disaster Program Manager
The LHMP Planning Team held three meetings, as summarized in Table 2-3, Planning Team Meeting Summary. The first two meetings included invitations to the entire Planning Team distribution list. Meeting 3 consisted of a focused group to focus on the existing plan’s mitigation actions and progress toward the actions. Meeting materials, including PowerPoint presentations, sign-in sheets, agendas, meeting summaries, and other relevant handouts are provided in Appendix B.

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TABLE 2-3: PLANNING TEAM MEETING SUMMARY
Meeting Date Discussion Items
1 June 28, 2023 • Introductions
• Roles & Responsibilities
• Project and LHMP Goals
• Purpose and Requirements of the LHMP
• Confirm Hazard and Identify Community Assets
2 July 26, 2023 • Hazards to be Profiled
• Critical Facilities
• Problem/Issue Statements
• Capabilities Assessment
• Review Mitigation Actions
• Public Involvement Update
3 August 23, 2023 Mitigation Strategy – Review of existing mitigation actions and progress, discussion of ongoing mitigation actions
and potential new mitigation actions to consider
As part of the Planning Team meetings, components of the plan and updates were reviewed and discussed. Clarifications and additional information were obtained from Planning Team participants. Separate from the Planning Team meetings, discussions occurred with individuals and organizations on the Planning Team, as well as outside of the Planning Team to obtain additional information to further inform the LHMP.

Upon preparation of the draft LHMP, each of the planning team participants were provided with a link to access the plan and provide comments and/or respond to request for additional information and clarification. Comments and additional information received on the draft LHMP were incorporated into the document.

PUBLIC OUTREACH AND ENGAGEMENT
A public outreach and engagement strategy was developed to solicit public involvement and input in the LHMP planning process. Components of the public outreach program are described below, refer to Appendix B for outreach materials.

Webpage and Social Media
A dedicated webpage on the City’s website provided information on the LHMP, including a description of a hazard mitigation plan, its importance, and how the public could be involved in the planning process. A link to complete the community survey was provided along with a contact at the City for any comments or questions. Information on the City’s website was available for the entirety of the LHMP development process. The website was updated throughout the planning process and provided notifications and access to LHMP materials. The draft LHMP was also made available for review.

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By conducting virtual outreach through the City’s website, the City was able to reach a wide audience, including underserved and vulnerable populations who may have been unable to attend in-person events. Individuals were able to access all information at their own convenience and had the ability to communicate directly with City staff regarding questions or comments. Published content was also advertised via the City of Glendora's RSS Feed (subscription distribution lists) and social media channels.

Community Survey
A community survey was developed to obtain input from the public about various hazard mitigation topics. In addition to basic demographic information, the survey asked residents to identify specific safety concerns, including what hazards they felt were most likely to impact their neighborhood or property. Residents were also asked what actions they had taken to be more resistant to hazards. Information gained from the survey was used by the Planning Team to identify potential mitigation actions that would reduce damage and disruption from disaster or emergency events and how best to improve communication and dissemination of information.

The survey was made available for completion on the LHMP webpage from August 16, 2023 to September 22, 2023, and the survey link was distributed via email by the City and Planning Team members. The survey link was also advertised and distributed at all Community Events, described below. The survey received 164 responses. Of the responses received, 59 respondents provided contact information. Input received was generally consistent with feedback received during oneon-one conversations at the community events and during the focus groups. Respondents were most concerned about wildfire, seismic hazards, drought, and high winds/Santa Ana wind events.

Power outages that could occur because of hazard events were also identified as a significant concern. Respondents identified email, social media, city/agency website, and city/agency newsletters as the communication preference to receive information about reducing vulnerabilities to homes and neighborhoods. Nearly half (44.8 percent) of respondents felt that the City, County, and/or other agencies could help residents become better prepared for a disaster by increasing awareness of special needs and vulnerable populations.

Input received from the survey validated the hazards identified in the 2015 Natural Hazard Mitigation Plan, which have been retained and expanded upon in this LHMP update. The input was also considered when reviewing and developing mitigation actions specifically related to vulnerabilities, how the community can become better prepared, and the importance of preparedness, coordination, and response actions.

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Focus Groups
Six focus group meetings were conducted to provide an
opportunity for outreach to specific groups and
organizations to ensure diversity in the public participation process, and to obtain input directly from and relative to populations deemed more vulnerable to natural hazards
within the community. As part of the meetings, an
overview of hazard mitigation and the LHMP update
process was provided. The participants were asked to
provide input on issues or concerns related to the specific hazards and potential mitigation actions. Attendees engaged in an open discussion guided by questions specific to the group. The Project Management team met with the following groups and organizations:
 La Fetra Center. The La Fetra Center, in coordination with the City Recreation & Human Services Department, provides programs, services, and activities to older residents. Members of the Project Management Team attended a regularly scheduled lunch program providing meals to residents 60 years of age and older on April 16, 2024. The conversation focused on concerns about evacuation, especially for older people who are not able to drive or have other special needs, and how emergency information is communicated and received. This also provided an opportunity to inform the attendees of the emergency alert system.  The Los Angeles Centers for Alcohol and Drug Abuse (LACADA). LACADA is the leading provider of alcohol and drug abuse services in Los Angeles. The Project Management Team met with LACADA-associated partners including representatives from Homeless Outreach, Housing Navigator, and the Glendora Police Department on April 16, 2024. The discussion focused on topics related to the unsheltered population and provided the Planning Team with additional knowledge to supplement statistical data on vulnerable populations.  Youth Advisory Board. The Glendora Youth Advisory Board is a volunteer advisory and social group consisting of students aged between 12 and 17. The Project Management Team met with members of the Youth Advisory Board on April 16, 2024. The discussion focused on awareness of hazards and concerns of school-age youth. This information was used to supplement statistical data on vulnerable populations.
 Glendora Chamber of Commerce. The Glendora Chamber of Commerce is a voluntary organization of businesses who band together to encourage and promote a positive, balanced, and vital economy. The Project Management Team met with the Chamber on April 17, 2024. The meeting focused on topics related to businesses and their employees, including channels of communication during and after a hazard event and emergency preparedness, particularly for smaller businesses.
 Charter Oak Unified School District (USD) Parent Workshop. The Charter Oak USD provides several resources to parents of students. The Project Management Team met with eight Glendora Local Hazard Mitigation Plan
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parents during a workshop event on April 17, 2024. Due to the presence of non-English speakers, the presentation and discussion were translated into Spanish. The discussion focused on non-English speaking parents with school-age children. Information obtained from the focus group was used to supplement statistical data on vulnerable populations.  Glendora USD Safety Committee Meeting. The Glendora USD Safety Committee is a committee of parents dedicated to student safety. The Project Management Team met with the Safety Committee during a regularly scheduled meeting on April 17, 2024. The discussion focused on parents with school-age children and existing hazard mitigation activities conducted at schools. This information was used to supplement statistical data on vulnerable populations.

Similar to the community survey, discussions and input received from the focus groups further validated the hazards identified in the 2015 Natural Hazard Mitigation Plan, which have been retained and expanded upon in this LHMP update. The input also helped identify and reconfirm what worries people the most when they consider the potential impacts of a hazard event. This information was considered when reviewing and developing mitigation actions specifically related to vulnerable populations.

Community Events
The Project Management Team hosted a booth at
community events to inform the public about the LHMP
update process, obtain feedback on hazards, and
encourage completion of the survey. A raffle was held to engage and encourage participation. The community
events included the Glendora Emergency Preparedness
Day (Prepare Fair) on September 14, 2023, and an Earth
Day event on April 20, 2024.

Public Review Draft LHMP
A public review draft LHMP was originally made available to the public for review and comment, beginning March 6, 2025 and ending April 4, 2025. The draft LHMP was made available on the City’s LHMP webpage and at the City’s Planning counter. The Planning Team assisted in advertising availability of the draft LHMP through their email distribution lists and social media.

Information was provided on how to submit comments or ask questions regarding the draft LHMP.

REVIEW AND INCORPORATE EXISTING INFORMATION
The LHMP Planning Team referenced a variety of plans, studies, data, and technical reports available from local, State, and federal sources to prepare the LHMP. Primary resources reviewed and incorporated as part of the LHMP planning process are listed in Table 2-4, Primary Plan Resources. A complete list of resources is included in Section 7.0, References.

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TABLE 2-4: PRIMARY PLAN RESOURCES
Plans, Studies, Reports and Other Technical
Data/Information
Planning Process/Area of Document
Inclusion
Agency for Toxic Substances and Disease Registry
/Center for Disease Control’s (CDC) Social Vulnerability Index (SVI)
Vulnerability Assessment
Cal Fire Hazard Profiles, Vulnerability
Assessment, Mitigation Strategy
Cal-Adapt Hazard Profiles, Vulnerability
Assessment, Mitigation Strategy
California Department of Water Resources Hazard Profiles, Vulnerability Assessment California Geological Survey Hazard Profiles, Vulnerability Assessment California State Hazard Mitigation Plan Hazard Profiles City of Glendora General Plan Community Profile, Hazard Profiles, Mitigation Strategy
County of Los Angeles All-Hazards Mitigation Plan Hazard Profiles, Vulnerability Assessment FEMA Local Mitigation Planning Handbook, May 2023 Multiple plan sections FEMA Local Mitigation Planning Policy Guide, Effective
April 19, 2023
Multiple plan sections
FEMA Community Lifelines Implementation Toolkit Stakeholder identification and outreach FEMA Guide to Expanding Mitigation Stakeholder identification and outreach, Vulnerability Assessment, Mitigation
Strategy
FEMA National Risk Index Hazard Profiles, Vulnerability Assessment FEMA Map Service Center Hazard Profiles, Vulnerability Assessment National Drought Mitigation Center Hazard Profiles, Vulnerability Assessment U.S. Census American Community Survey Community Profile, Vulnerability Assessment
U.S. Drought Monitor Hazard Profiles, Vulnerability Assessment

2.2 ASSESS RISKS
In accordance with FEMA requirements, the LHMP Planning Team identified and confirmed the natural hazards affecting Glendora and assessed the community’s associated vulnerability from those hazards. Results from this phase of the LHMP planning process aided subsequent identification of appropriate mitigation actions to reduce risk from these hazards, refer to Section

5.0, Mitigation Strategy.

IDENTIFY/PROFILE HAZARDS
Based on a review of past hazards in the existing plan, as well as a review of existing plans, reports, and other technical studies, data, and information, the LHMP Planning Team determined if specific hazards were valid and identified other hazards that could affect the City. Content for each hazard profile is provided in Section 4.0, Hazards Assessment.

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ASSESS VULNERABILITIES
Hazard profiling exposes the unique characteristics of individual hazards and begins the process of determining which areas within the City are vulnerable to specific hazard events. The vulnerability assessment included input from the LHMP Planning Team and a GIS overlaying method for hazard risk assessments. Using these methodologies, populations and critical facilities impacted by hazards were identified and potential loss estimates were determined where available. The vulnerability assessments for each hazard are provided in Section 4.0.

2.3 DEVELOP MITIGATION PLAN

IDENTIFY GOALS
The City’s previously adopted 2015 Natural Hazard Mitigation Plan provided relevant information in preparation of this LHMP, including the identification of mitigation goals. The Planning Team reviewed the previously developed goals and upon discussion, the mitigation goals were reconfirmed, with minor modifications, to guide the specific mitigation actions aimed at reducing risk and preventing loss associated with natural hazards. The Mitigation goals are presented in Section 1.5, Mitigation Goals.

DEVELOP CAPABILITIES ASSESSMENT
A capabilities assessment is a comprehensive review of all the various mitigation capabilities and tools currently available to the City to implement the mitigation actions prescribed in the LHMP.

The LHMP Planning Team identified the planning and regulatory, administrative and technical, financial, and education and outreach capabilities to implement mitigation actions, as detailed in Section 5.0.

IDENTIFY MITIGATION ACTIONS
As part of the LHMP planning process, existing mitigation actions were reviewed to assess whether they had been completed, were in progress or on-going, or continued to be relevant. New mitigation actions were also identified and developed. The mitigation actions were prioritized as high, medium, or low. The process was informed by the identification of the hazards, problems/issues statements identified by the Planning Team, input received as part of the community outreach, and vulnerability assessment. During this process, the capabilities assessment was also referenced to better understand if the capability already existed and needed to be expanded, or if the capability was not currently available. A detailed discussion of the identification and prioritization of mitigation actions is provided in Section 5.0.

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PLAN REVIEW AND REVISION
As previously noted, once the draft LHMP was completed, a public review period was provided from March 6, 2025 to April 4, 2025, to allow public review and comments. Comments received on the draft LHMP were reviewed and the LHMP was revised, as appropriate.

PLAN ADOPTION AND SUBMITTAL
This plan will be submitted to Cal OES and FEMA for review. Upon receiving “approvable pending adoption” notification from FEMA, this plan will be presented to the City Council for their consideration. If approved, a copy of the resolution will be provided in Appendix A.

PLAN MAINTENANCE
Plan maintenance procedures, found in Section 6.0, Plan Maintenance, include the measures the City will take to ensure the LHMP’s continuous long-term implementation. The procedures also include the way the LHMP will be regularly monitored, reported upon, evaluated, and updated to remain a current and meaningful planning document.

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Section 3.0 | Community Profile

3.1 GEOGRAPHY AND ENVIRONMENT
The City of Glendora covers approximately 19.6 square miles (about 12,540 acres) in eastern Los Angeles County. It is located at the intersection of the 57 and 210 freeways, in the foothills of the San Gabriel Mountains. Glendora is bordered by the Angeles National Forest to the north, the City of Azusa to the west, the City of Covina to the south, and the City of San Dimas to the east (see Figure 3-1, Regional Vicinity, and Figure 3-2, City and Sphere of Influence). Additionally, the City’s Planning Area includes about 260.5 acres of unincorporated Los Angeles County within its sphere of influence (SOI).

Two predominant terrain types are located within Glendora: alluvial fan and foothill. The alluvial fan portion of the City is characterized by gently to moderately sloping areas within the City where a vast majority of urban development has already occurred. The foothill portion of the City is characterized by moderate to very steep hillsides predominantly located along the northern boundary adjacent to the Angeles National Forest. In addition, a small area known as “South Hills” located in the southern portion of the City is also characterized by foothill terrain. Elevations in the City range from 776 feet to 3,600 feet.

The nearest major river is the San Gabriel River, which traverses northwest section of the Planning Area. According to the State Water Resources Control Board, the San Gabriel River receives drainage from 689 square miles of eastern Los Angeles County; its headwaters originate in the San Gabriel Mountains. The river itself does not pose any significant impact on the City; its channel is typically dry and only carries substantial water flow during major rainstorms.

3.2 CLIMATE
Temperatures in the City of Glendora typically range from 45 degrees Fahrenheit in the winter months to over 92 degrees Fahrenheit in the summer months. However, the temperatures can vary over a wide range, particularly when the Santa Ana winds blow, bringing higher temperatures and very low humidity. Temperatures occasionally exceed 100 degrees Fahrenheit in the summer months (June-September), and rarely drop below 30 degrees Fahrenheit in the winter months (November-March). Rainfall in the City averages less than three inches of rain per month. Actual rainfall in the southern California region tends to fall in large amounts during sporadic and often heavy storms rather than consistently over storms at somewhat regular intervals.

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3.3 HISTORY
The City of Glendora was founded in 1887 and incorporated in 1911. According to the City's General Plan Historic Preservation Element, Glendora's rich history traces back to the presence of the Gabrielino Indians, dating as far back as 6000 B.C. During the era of Mexican governance, the area now known as Glendora was part of a Mexican land grant, which was acquired by British merchant Henry Dalton in 1844. Following the Mexican-American War, the Treaty of Guadalupe Hidalgo was signed in 1848, ceding California's lands to the United States.

The town's development began in the late 1880s under the leadership of George Dexter Whitcomb, who named it "Glendora" by combining the word "glen" with his wife Leadora's name.

Glendora grew rapidly in the late 19th and early 20th centuries, fueled in part by the arrival of the Pacific Electric Railway in 1907, which connected the town to neighboring cities and spurred further expansion.

Agriculture, particularly citrus farming, was the cornerstone of Glendora's early economy. The region’s mild climate and fertile soil made it an ideal location for citrus cultivation, and cooperatives were established to support this thriving industry. In addition to agriculture, social, educational, and religious institutions flourished, with organizations such as the Glendora Women's Club, the Masonic Lodge, and various churches playing vital roles in the town's growth. Glendora officially became a city in 1911, marking a significant milestone in its development.

As time passed, Glendora saw substantial economic growth, including key infrastructure projects, residential expansion, and the development of industrial and commercial sectors. Today, more than 50,000 residents call Glendora home, enjoying excellent public and private schools, parks, and community services. The City is also known for its safety, boasting one of the lowest crime rates in Los Angeles County.

L O S A N G E L E S C O U N T Y

O R A N G E C O U N T Y

S A N B E R N A R D I N O

C O U N T Y

R I V E R S I D E C O U
RANCHO

CUCAMONGA

CHINO HILLS
UPLAND

ONTARIO
CHINO

MONTCLAIR

ROSEMEAD

SOUTH EL
MONTE

TEMPLE CITY

CERRITOS

NORWALK

LA MIRADA

SANTA FE

SPRINGS

LA HABRA

HEIGHTS
PICO
RIVERA
LA
PUENTE

EL MONTE
SIERRA
MADRE

ARCADIA

BRADBURY

MONROVIA

BALDWIN
PARK

IRWINDALE
DUARTE
WALNUT

DIAMOND BAR
POMONA

LA VERNE

EASTVALE
NORCO

FULLERTON CORONA

BUENA PARK ANAHEIM

WHITTIER
AZUSA
COVINA

INDUSTRY

CLAREMONT

SAN DIMAS

WEST COVINA

LA HABRA

YORBA LINDA

PLACENTIA
BREA
66 142
39 57
39 90
83 72
91 91
71 71
164
210
60 60
2 5
210
210
605
10 10
Glendora
LEGEND
Glendora City Limits
Incorporated Area
County Boundary
National Forest Lands
Figure 3-1. Regional Vicinity

CITY OF GLENDORA, CALIFORNIA
\0 1 2
Miles
Sources: Los Angeles County GIS; Southern California Association of Governments; USFS; MAXAR Imagery 4/4/2021. Map date: November 13, 2024.

A N G E L E S N A T I O N A L F O R E S T
S A N

B E R N A R D I N O

N A T I O N A L

F O R E S T
S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
La Verne
San Dimas
Azusa
Covina
LEGEND
Glendora City Limits
Angeles National Forest
Glendora Sphere of Influence (SOI)
Other Incorporated Areas
Azusa
Covina
La Verne
San Dimas
Figure 3-2. City and Sphere of Influence

CITY OF GLENDORA, CALIFORNIA
\
0 ¼ ½
Miles
Sources: Los Angeles County GIS; Southern California Association of Governments; USFS; MAXAR Imagery 4/4/2021. Map date: November 13, 2024.

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3.4 DEMOGRAPHICS
Basic demographic data for Glendora (population, education, employment, and housing) obtained from the US Census 2018-2022 American Community Survey (ACS) is summarized below.1

POPULATION
Table 3-1, Glendora and Los Angeles County Population and Housing Data (2022), provides an overview of the City’s and County’s demographics.

TABLE 3-1: GLENDORA AND LOS ANGELES COUNTY POPULATION AND HOUSING DATA (2022) Category Glendora Los Angeles
County
Total Population 52,095 9,936,690
Percent of Residents that are children (under 18 years) 22.4% 21.1% Percent of Residents that are senior citizens (65 and over) 16.8% 14.2% Median Age (years) 40.4 37.4
Median Household Income $106,718 $83,411
Median House Value $749,400 $732,200
Occupied Housing Units 16,751 3,363,093
Percent of Renter Occupied 32.1% 53.8%
Source: US Census American Community Survey 5-Year Estimates 2018-2022.

Glendora’s 2022 estimated population is 52,095 residents. When compared to Los Angeles County, the City has a higher household income, home ownership rate, and median house value.

The median age of City residents is 40.4, higher than the median age of County residents at 37.4.

The City has a higher percentage for both residents under 18 and residents over 65 when compared to the County. Approximately 22.4 percent of the City’s population is below the age of 18 and approximately 16.8 percent is above the age of 65.

A greater percentage of Glendora residents identify as white when compared to Los Angeles County; refer to Table 3-2, Glendora and Los Angeles County Racial and Ethnic Composition (2022). Hispanic or Latino persons of any race constitute 40.0 percent of the City’s residents compared to 48.7 percent of County residents. Persons identifying as Asian make up 11.2 percent of the population. Persons identifying as “some other race” account for 12.4 percent of the population, while those reporting two or more races make up 16.1 percent of the City’s population. 1 The 2018-2022 American Community Survey (ACS) 5-year estimates is the most current 5-year data profile available. It represents 60 months of collected data and provides the most reliable and largest data set.

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TABLE 3-2: GLENDORA AND LOS ANGELES COUNTY RACIAL AND ETHNIC COMPOSITION (2022) Category
Glendora Los Angeles County
Population
Percentage
of
Population
Population
Percentage
of
Population
White 29,386 56.4% 3,937,901 39.6%
Black or African American 1,286 2.5% 780,993 7.9%
American Indian and Alaskan
Native 660 1.3% 111,096 1.1%
Asian 5,859 11.2% 1,473,634 14.8%
Native Hawaiian and Other Pacific
Islander 54 0.1% 23,400 0.2%
Some Other Race 6,464 12.4% 2,253,956 22.7%
Two or More Races 8,386 16.1% 1,355,710 13.6%
Hispanic or Latino (of any race)1 20,863 40.0% 4,837,594 48.7% Total 52,095 100% 9,936,690 100%
Source: US Census American Community Survey 5-Year Estimates 2018-2022.

Notes:

1. Hispanic or Latino persons are not counted as a separate racial or ethnic category; persons who identify as Hispanic or Latino are also included in other racial or ethnic categories.

EDUCATIONAL ATTAINMENT
When compared to Los Angeles County, residents of Glendora exhibit higher levels of educational attainment (see Table 3-3, Glendora and Los Angeles County Educational Attainment (2022)).

Among Glendora residents aged 25 and older, 14.1 percent hold a graduate or professional degree, 23.2 percent have earned a bachelor’s degree, and 11.1 percent possess an associate degree. Additionally, only 3.9 percent of adults in Glendora have not completed high school, in contrast to 8.0 percent of adults across the broader Los Angeles County.

TABLE 3-3: GLENDORA AND LOS ANGELES COUNTY EDUCATIONAL ATTAINMENT (2022) Educational Attainment
(25 years and older)
Glendora Los Angeles County
Population
Percentage
of
Population
Population
Percentage
of
Population
Less than 9th Grade 1,178 3.3% 811,822 11.7%
9th to 12th Grade, no diploma 1,411 3.9% 552,831 8.0%
High School Graduate 7,800 21.6% 1,412,260 20.4%
Some College, No Degree 8,232 22.8% 1,260,211 18.2%
Associate Degree 4,000 11.1% 482,967 7.0%
Bachelor’s Degree 8,381 23.2% 1,542,422 22.3%
Graduate or Professional Degree 5,101 14.1% 847,137 12.3% Total 36,103 100 6,909,650 100
Source: US Census American Community Survey 5-Year Estimates 2018-2022.

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EMPLOYMENT
Of the 41,954 residents over 16 years of age, almost two-thirds (61.9 percent or 25,964 residents) are in the labor force. Out of the 25,964 people in the labor force, 24,366 (58.1 percent) are employed and 1,589 (3.8 percent) are unemployed. The educational services and health care/social services sector employ the largest number of City residents (28.5 percent), followed by retail trade (10.8 percent), and professional scientific, management, and administrative and waste management services (9.2 percent). The median household income in the City is $106,718.

While approximately 13.2 percent of employees work from home, a majority of Glendora’ residents commute outside of the City for work. The average commute travel time is 33.6 minutes.

HOUSING AND HOUSEHOLD CHARACTERISTICS
In 2022, Glendora had a total of 16,751 occupied housing units (households) (see Table 3-4, Glendora and Los Angeles County Household Characteristics (2022)). The predominant housing type in the city is single-family detached units, which make up approximately 70.3 percent of the housing stock. According to the U.S. Census ACS 5-Year Estimates (2018-2022), about 74.1 percent of Glendora's existing housing was built between 1940 and 1979.

TABLE 3-4: GLENDORA AND LOS ANGELES COUNTY HOUSEHOLD CHARACTERISTICS (2022) Household Type Glendora Los Angeles
Population Percent Population Percent
Families 12,834 76.6% 2,218,646 66.0%
With related children of householder under
18 years 5,951 35.5% 1,045,971 31.1%
Housholder Living Alone 3,074 18.4% 870,733 26.0%
65 Years and Older 1,556 9.3% 301,059 9.0%
Non-family 3,917 23.4% 1,144,447 34.0%
Total Households 16,751 100% 3,363,093 100%
Average Household Size 3.04 2.89
Average Family Size 3.45 3.56
Source: US Census American Community Survey 5-Year Estimates 2018-2022.

In Glendora, families constituted 76.6 percent of the 16,751 housing units in the City, which represents a relatively higher proportion than in Los Angeles County (66.0 percent). Families with children represented 35.5 percent of households in Glendora and 31.1 percent in Los Angeles County. Single-person households represented 18.4 percent of households in Glendora, which is lower than the proportion of single-person households in Los Angeles County (26.0 percent).

Household size identifies sources of population growth and household overcrowding. In general, a city’s average household size will increase over time if there is a trend toward larger families. In communities where the population is aging, the average household size may decline. The average household size for Glendora in the 2018-2022 period was 3.04, which was higher than Los Angeles County, with an average household size of 2.89.

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3.5 LAND USES AND EXISTING DEVELOPMENT
The development of Glendora is directed by its General Plan, which assigns land use designations to all areas within the city's planning boundary (see Figure 3-3, General Plan Land Use Map). Table 3-5, Land Use Designations, outlines the current land use designations and provides descriptions of the typical uses permitted in each designation. Additionally, Table 3-6, Glendora Development Capacity (2025), details the development capacity projected for the city under the General Plan.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora
MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
LEGEND
Glendora City Limits
Sphere of Influence
Angeles National Forest
Hillside Very Low Density
Low Density
Low/Medium Density
Medium Density
Medium/High Density
High Density
General Commercial
Regional Commercial
Light Industrial
General Industrial
Civic/Institutional
Utility and Flood
Control
Conservation Open
Space
Open Space
Railroad
Arrow Highway
Specific Plan
Route 66
Specific Plan
Village Mixed Use
Figure 3-3. General Plan
Land Use Map

CITY OF GLENDORA, CALIFORNIA
\
0 ¼ ½
Miles
Sources: City of Glendora Public Map Viewer, accessed 3-7-2024; Los Angeles County GIS; Southern California Association of Governments; USFS. Map date: November 13, 2024.

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TABLE 3-5: LAND USE DESIGNATIONS
Land Use
Maximum DUs
or Maximum
FAR
Summary Description of Land Use
Designation
Residential Land Use
Hillside Very Low Residential 1 du/ac
The Hillside Density Residential Designation is
intended for hillside areas and allows for the
development of single-family residential
development on lots of at least one acre in size.

The preservation of natural hillside features is
strongly encouraged within this land use
designation.

Low Density Residential 3 du/ac
Low Density Residential Designation is intended
for the transitional areas between hillside areas
and higher density single-family residential areas.

This designation allows for the development of
single family residential on lots ranging from
10,500 to 30,000 square feet.

Low/Medium Density
Residential 6 du/ac
Low/Medium Density is the most intensive
designation for single-family residences and
encompasses most of the non-hillside areas. This
designation allows for the development of the
smallest detached single-family residential lots
and the typical lots range in size from 7,500 to
8,500 square feet in size.

Medium Density Residential 11 du/ac
Medium Density Residential Designation allows
for multiple and single family attached housing
and is a transitional between the detached singlefamily areas and the higher density multiple family areas. This designation allows for a variety of
housing types including small-lot single family,
apartments, duplexes, condominiums, and
townhouses.

Medium/High Density
Residential 15 du/ac
Medium/High Density allows for multiple and
single family attached housing and is transitional
between the lower density attached housing areas
and the higher density multiple family areas.

Medium/High Density allows for a variety of
housing types including apartments, duplexes,
townhouses, and patio homes.

High Density Residential 25 du/ac1
High Density is the most intensive residential land
use designation. This designation is found along
major and secondary arterials and is used as a
transition between the other residential land uses
and the more intensive non-residential land uses.

Development at this density requires
consideration of internal and external circulation,
the relationship of buildings and units to each
other, and the provision of common open space
and private outdoor living areas.

Mixed Use
Village Mixed Use 30 du/ac/ up to

1.0 FAR
The Village Mixed Use Designation is intended to
preserve and enhance the unique character of the
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Land Use
Maximum DUs
or Maximum
FAR
Summary Description of Land Use
Designation
Village area and to encourage a mix of
complimentary development. Encouraged
development includes professional offices,
public/quasi-public facilities, retail businesses,
small-lot single family and multiple family
residential developments.

Commercial
General Commercial 0.5 FAR
The General Commercial designation is intended
for general commercial uses. These include retail
businesses, professional offices, automotive
services, and other similar businesses.

Development may take the form of single or multitenant establishments, including shopping centers.

Regional Commercial 0.5 FAR
The Regional Commercial designation is intended
to encourage the development of regionally
serving commercial development. The intended
uses within this designation include major
department stores, specialty retail outlets,
restaurants, offices, automobile dealerships,
hotel, and other complementary uses.

Industrial
Light Industrial 0.35 FAR
The Light Industrial designation is intended to
encourage general industrial uses which are
compatible with surrounding land uses, and which
would not degrade the character of adjacent
neighborhoods. This designation is intended to
serve business parks, research, and
development, technology centers, corporate and
office uses, “clean” industry and support retail
uses, auto truck and equipment sales,
warehousing, and distribution.

General Industrial 0.35 FAR
The General Industrial designation is intended for
more intensive industrial uses, such as
manufacturing, fabrication, assembly, processing,
trucking, warehousing and distribution,
equipment, and servicing. Uses include industrial
research, assembly, and testing of electronics,
instruments, and office and related machinery,
wholesaling, warehousing, administrative offices,
and regional or home offices of industry.

Other
Civic/Institutional --
The Civic/Institutional designation includes
educational uses, such as primary and high
schools, colleges, universities hospitals, and
governmental facilities.

Utility and Flood Control --
The Utility and Flood Control designation is
intended to designate those areas in the city that
are developed for utility and flood control use.

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Land Use
Maximum DUs
or Maximum
FAR
Summary Description of Land Use
Designation
Route 66 Corridor Specific Plan Various
The Route 66 Corridor Specific Plan designation
allows for the implementation of a complimentary
mix of land uses, consistent with the policies and
regulations contained within the Specific Plan that
governs land uses within a particular area. The
Specific Plan land use designation provides for
tailored development standards, design
guidelines and other policy and regulatory
elements that guide future land use and
improvements.

Arrow Highway Specific Plan Various
The Arrow Highway Specific Plan implements the
City’s vision for its southernmost corridor by
fostering livability, housing, retail, and service
options; improving and integrating open space
and community spaces; encouraging catalytic
projects; and improving mobility. The Specific
Plan establishes development standards, parking
standards, design guidelines, a mobility and
infrastructure component, administration and
implementation plan, and other requirements to
ensure the orderly development of the Arrow
Highway Specific Plan area.

Open Space
Conservation Open Space --
The Conservation Open Space designation
includes areas that are publicly owned,
undeveloped and will remain in a natural state.

This designation is intended to protect areas with
high scenic value, environmental and habitat
sensitivity, and passive recreational facilities.

Open Space --
The Open Space designation includes public and
privately owned open space areas such as parks,
golf courses, and cemeteries. The Open Space
designation generally contains active and passive
recreational facilities available for public use.

Source: City of Glendora, General Plan Land Use Element, 2006; City of Glendora, Arrow Highway Specific Plan, 2018.

Notes:

1. In the Grand-Foothill Multi-Family Residential Overlay Zone the residential density maximum may reach up to 30 dwelling units per acre.

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TABLE 3-6: GLENDORA DEVELOPMENT CAPACITY (2025)
Land Use Designation Acres Percentage of
the City Total
Potential
DU
(Minimum)
Potential
DU
(Maximum)
Potential SF
Residential
Hillside Very Low
Residential 1,907.01 15.21 191 1,907
Low Density Residential 1,090.56 8.70 1,200 3,272
Low/Medium Density
Residential 1,874.28 14.95 5,810 11,246
Medium Density
Residential 109.21 0.87 666 1,201
Medium/High Density
Residential 134.44 1.07 1,492 2,017
High Density Residential 125.19 1.00 1,890 3,130
Total Residential 5,240.69 41.79 11,249 22,772
Mixed Use
Village Mixed Use 38.50 0.31 72 144 209,633
Total Mixed Use 38.50 0.31 72 144 209,633
Commercial
General Commercial 97.14 0.77 1,480,996
Regional Commercial 114.56 0.92 1,746,582
Total Commercial 211.70 1.69 3,227,578
Industrial
Light Industrial 30.14 0.24 459,514
General Industrial 39.55 0.32 602,979
Total Industrial 69.69 0.56 1,062,493
Other
Civic/Institutional 346.82 2.77
Route 66 Corridor
Specific Plan 286.93 2.28 1,228 1,228 4,432,309
Utility and Flood Control
ROW 267.39 2.13
Street and Freeway
ROW 1,382.24 11.02
Railroad ROW 51.59 0.41
Total Other 2,334.97 18.61
Open Space
Open Space 4,304.86 34.33
Conservation Open
Space 339.38 2.71
Open Space 4,644.24 37.04
Total – City Limits 12,507.47 100.00 12,550 24,144 8,932,013 Unincorporated Los
Angeles County (SOI) 260.47
Total – City and SOI 12,800.26
Source: City of Glendora, General Plan Land Use Element, 2006.

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3.6 DEVELOPMENT TRENDS AND FUTURE DEVELOPMENT
Glendora is an urbanized community that is largely built out, with limited vacant land available for new development. Since the adoption of the 2015 Natural Hazards Mitigation Plan, new development has primarily taken the form of infill development on underutilized sites within the City. The City Limits and Sphere of Influence (SOI) have not expanded since that time; however, the City of Glendora has experienced population growth and new development, while also adopting plans that support future development in specific areas of the city. Glendora's population has grown by approximately 2,022 people, or 4.0%, since 2015, while other demographic characteristics have remained largely unchanged.
2 Since preparation and adoption of the 2015
Natural Hazards Mitigation Plan, the City of Glendora has experienced population growth and new development and has adopted plans that provide opportunities for future development within specific areas of the City.

PROPOSED DEVELOPMENT
Table 3-7, Major Development Projects, shows current major development projects under construction, approved or proposed within the City. Major development projects include new residential construction of at least eleven dwelling units or more, and new commercial construction of 5,000 square feet (SF) or more.
2 The 2015 Local Hazard Mitigation Plan estimated the City’s population using the 2010 US Census population of 50,073.

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TABLE 3-7: MAJOR DEVELOPMENT PROJECTS
Project Address Project Name Type of
Development Project Description Status
Northwest Glendora La Colina (Former
Monrovia Nursery) Residential 121 lot single-family subdivision Under
Construction
950 Silent Ranch “Grand Estates” Residential 12 Lot single-family subdivision Approved
1121 E Arrow Highway “Central Park” Residential
19 3-story residential
units in 3 attached
buildings
Approved
531 E Arrow Highway N/A Residential 33 attached 3-story residential condo units Approved
1237 Bonnie Cove Ave Citrus Oak Residential
30 Detached condo
subdivision 2-story
homes
Approved
630 W Foothill Blvd N/A Commercial 9,500 SF Medical
Office Approved
210 S Grand Ave N/A Commercial 20,974 SF Medical
Office Approved
400 N Glendora Ave Cornerstone Bible
Church Expansion Institutional New 9,287 SF Sanctuary Approved 1201 E Arrow Hwy N/A Residential 46 attached 3-story
residential condo units Approved
1861 E Route 66 SkinPerfect
Building Commercial 6,232 SF Medical Office Approved
1717 S Grand Ave N/A Commercial Car Wash Proposed
723 E Route 66 N/A Residential
39 attached 3-story
residential condo units
-- zone change
Approved
1332 S Lone Hill N/A Industrial
Service 47,800 SF industrial Proposed
631-657 Arrow Highway N/A Residential 46-unit residential Proposed Southwest corner of
Sunflower and
Gladstone
Sunflower &
Gladstone Residential
81 detached &
attached residential
units
Proposed
Source: City of Glendora, Current Development Projects, https://www.cityofglendora.org/departments/economic-development/developmentprojects, accessed November 7, 2024.

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GENERAL PLAN HOUSING ELEMENT UPDATE
The Southern California Association of Governments (SCAG) 6th Cycle Final Regional Housing Needs Assessment (RHNA) Allocation Plan was approved in March 2021 and identifies housing growth by county and city to accommodate projected population growth needs. On December 16, 2022, the City of Glendora adopted their Housing Element Update to accommodate the RHNA projected housing needs. The RHNA Allocation for Glendora is outlined in Table 3-8, Glendora RHNA Allocation (2021-2029).

TABLE 3-8: GLENDORA RHNA ALLOCATION (2021-2029)
Income Category 2021-2029 RHNA
Extremely Low Income 368
Very Low 367
Low 386
Moderate 388
Above Moderate 767
Total 2,276
Source: Southern California Association of Governments, SCAG 6th Cycle Final RHNA Allocation Plan, 2021.

As shown in Table 3-6, the RHNA plan allocated 2,276 new housing units to Glendora for the October 2021 through October 2029 planning period. Although the City is required to provide adequate land to accommodate the 2,276 new housing units, the City is not required to build housing. The 2021-2029 Housing Element accommodates the RHNA through a combination of new residential and mixed-use development on identified underutilized and vacant sites, located primarily within the Route 66 Corridor Specific Plan, Arrow Highway Specific Plan, and other urbanized areas of the City; the development of accessory dwelling units (ADUs) throughout the City; and projects that have either been approved or were in the entitlement process. Figure 3-4, Housing Element Sites Inventory, shows the location of sites identified for future residential development by the 2021-2029 Housing Element.

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FIGURE 3-4: HOUSING ELEMENT SITES INVENTORY
Source: City of Glendora, City of Glendora 2021-2029 Housing Element, 2021.

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The Route 66 Corridor Specific Plan establishes a comprehensive policy and regulatory guidance document for all properties within the Route 66 Corridor specific plan project area. The plan area contains approximately 287.18 acres, generally located along Route 66 from Barranca Avenue on the west to Amelia Avenue on the east. The Specific Plan was adopted in December 2003 and was revised in May 2017. The Specific Plan provides the necessary regulatory and design guidance that will ensure future development implements the adopted policy for the project area.

The Route 66 Corridor Specific Plan is a community-based plan, developed with extensive input by policy makers, business owners and property owners. The policy and regulatory elements of the specific plan are reflective of public consultation with business and property owners, developers, appointed and elected officials, staff, and the public.

The Arrow Highway Specific Plan, adopted in 2018, outlines a long-term vision and goals for a

2.73-mile stretch of Arrow Highway. The plan aims to revitalize the corridor through a mix of redevelopment initiatives, including neighborhood-serving retail, office spaces, light industrial uses, a variety of housing options, as well as bike paths and open spaces. It also introduces new land use designations and development standards for both residential and commercial properties.

GLENDORA METRO STATION AND FOOTHILL EXTENSION
The Foothill Extension (formerly the Gold Line Foothill Extension) is an ongoing construction project extending the light rail A Line (formerly Gold Line), a part of the Los Angeles County Metropolitan Transportation Authority (Metro) public transit system. The Glendora Metro Station is located just south of the City’s historic downtown, east of Vermont Avenue and west of Glendora Avenue. The center platform station has light rail tracks on either side (one for westbound and one for eastbound trains).
3 Once the project is completed, a trip from Glendora to Pasadena will take approximately 22 minutes and further to downtown Los Angeles will take approximately 51 minutes. Major project construction was completed in January 2025; the extension is undergoing final testing, training, and preparation and is anticipated to open for passenger service in summer 2025.
4 3.7 INFRASTRUCTURE SYSTEMS
Infrastructure systems within the City, such as roadways, water and wastewater facilities, electricity, and natural gas, provide vital community and individual functions. Local transportation and water and wastewater conveyance facilities and distribution systems are maintained and operated by the City. Electricity, natural gas, and regional wastewater conveyance and treatment facilities are primarily owned, operated, and maintained by other agencies. The ability for 3 Metro Gold Line Foothill Extension Construction Authority, Glendora, https://foothillgoldline.org/cities_stations/glendora/, accessed September 9, 2024.
4 Metro Gold Line Foothill Extension Construction Authority, Foothill Gold Line News, https://foothillgoldline.org/dual_content/sign-up-for-enews/, accessed February 25, 2025.

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infrastructure systems to remain operational during hazard events and emergencies will contribute to the City’s ability to withstand or recover sooner from hazard events.

TRANSPORTATION
Regional access is provided via the Foothill Freeway (I-210). The I-210 Freeway provides eastwest regional circulation through the City, connecting with the Orange Freeway (SR-57) at the eastern boundary of the City. There are three roadways that interchange with the I-210 Freeway:

Grand Avenue, Sunflower Avenue, and Lone Hill Avenue. Inspection and maintenance of the City’s transportation facilities are critical to ensuring their protection against disasters, such as earthquakes.

Public transportation in the City is provided through a combination of regional transit systems and various city contracted bus systems. The Los Angeles County Metropolitan Authority (Metro) provides bus service, connecting the City to the larger San Gabriel region. Light rail service will be provided to the City with the future extension of the A Line (Gold Line). The Glendora to Pomona Foothill Extension segment was completed in January 2025 and is anticipated to begin operation in summer 2025. In addition to the public transit options, the City offers a Dial-RideService, which is a shared ride, curb-to-curb, transportation service provided to Glendora Residents who are 62 years of age or older, as well as residents who are younger than 62 who are unable to independently use the public transportation system due to disability.

WATER AND WASTEWATER
The City of Glendora Public Works Department, Water Division (GWD) provides potable water service to the majority of the City’s residents and businesses. A small portion of the City is served by Suburban Water Systems and the City of Azusa Light & Water Department. According to the City of Glendora 2020 Urban Water Management Plan (UWMP), the City is classified as an urban water supplier because it serves more than 3,000 customers. The City’s main source of water supply is groundwater pumped from the Main San Gabriel Valley Basin. Additional water sources include the filtered surface water from the Metropolitan Water District of Southern California (MWD), and filtered surface water from the Covina Irrigating Company (CIC). According to GWD, potable water is disinfected with chlorine (CIC and groundwater) or chloramines (MWD) before it is delivered to residents and businesses. MWD imported water sources are a blend of State Water Project water from northern California and water from the Colorado River Aqueduct. CIC source water originates from the San Gabriel Mountains.

The wastewater generated in the City of Glendora is treated by the Sanitation Districts of Los Angeles County (LACSD). According to the UWMP, wastewater is tied through the City’s local sewer collection system. The City’s local sewers connect into LACSD’s regional trunk sewers.

The regional trunk sewer lines deliver wastewater to one or more water reclamation plants owned by LACSD for treatment. The water reclamation plants are not located in the City’s service area.

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The water reclamation plants serving the City include the San Jose Creek Water Reclamation Plant (SJCWRP) and the Joint Water Pollution Control Plant (JWPCP). The SJCWRP has a treatment capacity of about 100 MGD. According to LACSD, the JWPCP treats 260 million gallons of wastewater per day (mgd) and has a total permitted capacity of 400 mgd.

ELECTRICITY
Southern California Edison (SCE) provides electricity to the City of Glendora. Electricity is distributed from power plants through power lines and substations. There are underground and overhead powerlines within the City. Damage to a substation or the larger distribution system outside of the City could result in power loss to the City. More localized power losses can also occur in the event transmission lines are damaged.

NATURAL GAS
Southern California Gas (SoCalGas) provides gas service to the City of Glendora. According to SoCalGas Gas Transmission Pipeline map of Los Angeles County, there is a high-pressure distribution line that runs along South Glendora Avenue to Route 66 within the City. Other gas transmission pipelines and high pressure (greater than 60 pounds per square inch) gas distribution mains run through other areas of Los Angeles County. Damage to these facilities could interfere with the natural gas service in the City. Similarly, more localized disruptions could occur in the event lower pressure distribution mains and smaller service lines connected to the gas meters at homes and businesses are damaged.

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Section 4.0 | Risk and Vulnerability
Assessment

4.1 HAZARD IDENTIFICATION
This section outlines the natural hazards that may impact Glendora, detailing their identification, classification, and the considerations used to assess their potential risk to the community. FEMA identifies a wide range of natural hazards that could affect communities, though their list is not exhaustive and allows for the inclusion of additional hazards based on local context. While Glendora may not be susceptible to all of these hazards, the Planning Team utilized various resources—including the City’s 2015 Natural Hazards Mitigation Plan, the Glendora General Plan Safety Element, the County of Los Angeles General Plan 2035 Safety Element, the California State Hazard Mitigation Plan (SHMP), and FEMA’s hazard list—to evaluate the risks specific to the area. The discussion of each hazard was informed by past occurrences in the City and surrounding areas, along with input from the community through surveys, outreach events, and focused meetings. Professional expertise and knowledge also played a key role in identifying and analyzing hazards.

Table 4-1, Glendora Hazard Identification, summarizes the hazards considered for inclusion in the Local Hazard Mitigation Plan (LHMP), incorporating findings from FEMA’s National Risk Index to further assess the City’s exposure to each identified hazard. In the process, the Planning Team consolidated some hazards into broader categories, renamed others for clarity, and added new hazards. For example, fault rupture, seismic ground shaking, liquefaction, and seismic-induced landslides are now grouped under the broader category of Seismic and Geologic Hazards. Severe Weather encompasses Santa Ana winds, heavy rain events (including those during El Niño years), and extreme heat, with extreme heat being newly included. Dam/Reservoir Failure now includes the potential for reservoir failures, and mudflows are categorized under non-seismic induced landslides. Drought has also been added as a new hazard to the profile.

Climate change, while not considered a separate hazard, is recognized as a factor that may intensify existing hazards. The Planning Team decided to address climate change within the profiles of specific hazards it may exacerbate. Additionally, power outages—whether planned or unplanned—are a secondary concern linked to multiple hazards. These outages are discussed in detail within the Severe Weather profile and cross-referenced in other relevant hazard profiles.

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TABLE 4-1: GLENDORA HAZARD IDENTIFICATION
Hazards
Include
in City
LHMP?
Discussion of Hazard’s Inclusion or Exclusion
Avalanche No Avalanches are not applicable to Glendora.

Climate Change* Yes
Climate change is not a discrete hazard but may change the characteristics of a hazard that affects the community, such as frequency and intensity. Climate change is discussed within each of the applicable hazard profiles.

Coastal Flooding No Not applicable due to distance from the coast.

Cold Wave No Not applicable due to climatic conditions.

Dam/Reservoir Failure* Yes Dams and reservoirs occur within and around the City and their potential failure could impact the City.

Drought Yes The City depends on groundwater and imported surface water, both of which are susceptible to drought.

Earthquake Yes
The City is underlain by the Sierra Madre Fault Zone. Hazards associated with earthquakes are addressed within the hazard category Seismic and Geologic Hazards.

Hail/Ice Storm No The City does not typically experience significant hail or ice storms.

Heat Wave
(Extreme Heat) Yes
Although extreme heat conditions are not typical within Glendora, they are becoming more common and typically have a greater impact on vulnerable populations. Extreme heat is addressed within the hazard category Severe Weather.

Landslide Yes
Portions of the City are located within areas identified as having a potential to experience seismic-induced landslides. Additionally, due to the topography of the City, there is the potential for slope instability and mudflows. These topics are addressed within the hazard category Seismic and Geologic Hazards.

Lightning No The City does not typically experience significant lightning events resulting in damage.

Flood
(Riverine Flooding) Yes FEMA-identified floodplains are located within the City and are therefore included.

Geological Hazards* Yes
Geological hazards that occur within the City are primarily associated with landslides, mudflows, and slope instability. These are addressed under the hazard category Seismic and Geologic Hazards.

Hazardous Materials* No
Hazardous materials are not generated within the City. Potential impacts associated with hazardous materials are more likely associated with a hazardous material spill along major
transportation routes, which are addressed at the regional level and within the City’s Emergency Operations Plan.

Hurricane No Hurricanes do not occur within the City.

Liquefaction* Yes
Portions of the City are located within areas identified as having the potential for liquefaction. Liquefaction is addressed within the hazard category Seismic and Geologic Hazards.

Seismic Hazards* Yes
The City is located within an area of southern California susceptible to earthquake ground shaking and associated seismic hazards, including liquefaction. These topics are addressed within the hazard category Seismic and Geologic Hazards.

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Hazards
Include
in City
LHMP?
Discussion of Hazard’s Inclusion or Exclusion
Strong Wind Yes
The City experiences periods of high wind events associated with Santa Ana wind conditions. Within the LHMP, these events are addressed under the hazard category Severe Weather.

Tornado No Tornadoes do not occur within the City.

Tsunami No Not applicable due to distance from the coast.

Volcanic Activity No The City is not located within an active volcano area.

Wildfire Yes The City contains areas identified as fire hazards. Wildfire is profiled within the LHMP.

Winter Weather Yes
The City does not typically experience severe winter storm events.

However, Glendora does experience heavy rain events with extended durations. Within the LHMP, heavy rains events are addressed under the hazard category Severe Weather.

Source: City of Glendora, 2024; FEMA National Risk Index.

Note: * indicates a hazard that is not included in FEMA’s National Risk Index but is locally relevant.

The following hazards are discussed within the LHMP:
 Climate Change (integrated into each hazard)
 Dam/Reservoir Failure
 Drought
 Flood
 Seismic and Geologic Hazards (ground shaking, liquefaction, landslides, mudflows, slope instability)
 Severe Weather (heavy rains, Santa Ana wind events, extreme heat)  Wildfire
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4.2 HAZARD PROFILES
This section contains profiles for the hazards identified as having the potential to occur in Glendora. Each hazard includes a description of the hazard, location of where the hazard may occur, history of the hazard, and the probability of the hazard’s future occurrence.

The probability of future occurrences are based on historical frequencies, statistical probabilities, hazard probability maps, and other available information. Probabilities are defined as follows:
 Unlikely – There may or may not have been historic occurrences of the hazard in the community or region and data suggest that occurrences are unlikely. The chance of future occurrences is less than 1 percent each year.
 Occasional – There may or may not have been historic occurrences of the hazard in the community or region, but data suggest there is a possibility that the hazard will occur in the community. The chance of future occurrences is between 1 to 10 percent each year.  Likely – There has been historic occurrences of the hazard in the community or region and data suggest it is likely that the hazard will continue to occur in the community. The chance of future occurrences is between 10 to 90 percent each year.  Highly likely – There has been historic occurrences of the hazard in the community or region and data suggest it is highly likely to continue to occur in the community. The chance of future occurrences is 90 percent or above each year.

DAM/RESERVOIR FAILURE
Description
A dam is an artificial barrier preventing the flow of water or loose solid materials (such as soil or snow) or a barrier built across a watercourse for impounding water. Dam failure is the uncontrolled release of impounded water from behind a dam. Flooding, earthquakes, blockages, landslides, lack of maintenance, improper operation, poor construction, vandalism, and terrorism can all cause a dam to fail. Dam failure causes downstream flooding that can affect life and property.

Reservoirs are defined as an artificial lake, pond, impoundment or tank, used to store water.

Reservoirs can be created on the surface by constructing dams to store water. Additionally, tank reservoirs can be constructed to store water either above ground, on the surface, or below ground.

Reservoir failure is the uncontrolled release of impounded water from a reservoir. Similar to dams, flooding, earthquakes, blockages, landslides, lack of maintenance, improper operation, poor construction, vandalism, and terrorism activities can all cause a reservoir to fail. Seismic activity may also cause inundation by the action of a differential movement of a reservoir and the water within, causing shearing or buckling of the reservoir infrastructure.

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Dam or reservoir failures are most likely to happen for the following reasons:1  Overtopping, caused by water spilling over the top of a dam; usually a precursor of dam failure because of inadequate spillway design, debris blockage of spillways, or settlement of the dam crest.
 Foundation defects, including settlement and slope instability.  Cracking caused by natural settling of a dam or seismic movements.  Inadequate maintenance and upkeep.
 Piping, when seepage through a dam is not properly filtered, soil particles continue to progress and form sinkholes in the dam.

FEMA and Cal OES require all dam owners to develop an Emergency Action Plan (EAP) for warning, evacuation, and post-flood actions. In the event of a major dam failure, mutual aid from all levels of government would be required for an extended period. Recovery efforts would include the removal of debris, clearing roadways, demolishing unsafe structures, assistance in reestablishing public services, and providing continued care for the affected population.

Dams are regulated by the Department of Water Resources, Division of Safety of Dams (DSOD).

DSOD ensures dam safety by:2
 Reviewing and approving dam enlargements, repairs, alterations, and removals, and ensuring that the dam appurtenant structures are designed to meet minimum requirements.  Performing independent analyses to understand dam and appurtenant structures performance, including structural, hydrologic, hydraulic, and geotechnical evaluations.  Overseeing construction to ensure work is performed in accordance with approved plans and specifications.
 Inspecting each dam on an annual basis to ensure it is safe, performing as intended, and not development issues.
 Periodically reviewing the stability of dams and their major appurtenances in light of improved design approaches and requirements, as well as new findings regarding earthquake hazards and hydrologic estimates in California.
1 Association of State Dam Safety Officials, Dam Incident Database Search, https://damsafety.org/Incidents, accessed July 19, 2023. 2 California Department of Water Resources, Division of Safety of Dams, https://water.ca.gov/programs/all-programs/division-of-safety-of-dams, accessed June 4, 2024.

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DSOD is responsible for assigning each jurisdictional dam a downstream hazard potential. The downstream hazard potential is based on potential downstream impacts to life and property should the dam fail when operating with a full reservoir. The downstream hazard is not related to the condition of the dam or the likelihood of the dam failing in either the short- or long-term. Dams in southern California usually do not operate at full capacity at all times of the year, and thus hazard risks and classifications are a worst-case scenario assessment. The DSOD definitions for downstream hazards are borrowed from the Federal Guidelines for Inundation Mapping of Flood Risks Associated with Dam Incidents and Failures. FEMA categorizes the downstream hazard potential into three categories – low, significant, and high – DSOD adds a fourth category of extremely high:3
 Low: No probable loss of human life and low
economic and environmental losses. Losses
are expected to be principally limited to the
owner’s property.
 Significant: No probable loss of human life but
can cause economic loss, environmental
damage, impacts to critical facilities, or other
significant impacts.
 High: Expected to cause loss of at least one
human life.
 Extremely High: Expected to cause
considerable loss of human life or would result
in an inundation area with a population of
1,000 or more.

DSOD uses the U.S. Army Corps of Engineer’s National Inventory of Dams condition assessment rating definition as a guideline in assigning condition assessments. A dam safety deficiency is defined as a load capacity limit or other issue that can result in a failure of the dam or appurtenant structure. It is a characteristic or condition that does not meet the applicable minimum regulatory criteria. Conditions assessment definitions are as follows:

Satisfactory No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.

Typical Circumstances:
3 California Department of Water Resources, Definitions for Downstream Hazard and Condition Assessment, https://water.ca.gov/- /media/DWR-Website/Web-Pages/Programs/All-Programs/Division-of-Safety-of-Dams/Files/Publications/Division-of-Safety-of-DamsDefinitions-for-Downstream-Hazard-and-Condition-Assessment.pdf, September 2021, accessed June 4, 2024.

Source: Kiewit, Dams by Kiewit,
https://www.linkedin.com/posts/kiewit_dams-by-kiewit-activity7034553427934265344-P1-Z, accessed November 21, 2024.

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 No existing deficiencies or potentially unsafe conditions are recognized, with the exception of minor operational and maintenance items that require attention.
 Safe performance is expected under all loading conditions including the design earthquake and design flood.
 Permanent risk reduction measures (reservoir restrictions, spillway modifications, operating procedures, etc.) have been implemented to eliminate identified deficiencies.

Fair No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note:

Rare or extreme events are defined by the regulatory agency based on their minimum applicable state or federal criteria.

Other Circumstances:
 Lack of maintenance requires attention to prevent developing safety concerns.
 Maintenance conditions may exist that require remedial action greater than routine work and/or secondary studies or investigations.  Interim or permanent risk reduction measures may be under consideration.

Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. Poor may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.

Other Circumstances:
 Dam has multiple deficiencies or a significant deficiency that requires remedial work.
 Lack of maintenance (erosion, sinkholes, settlement, cracking, unwanted vegetation, animal burrows, inoperable outlet gates) has affected the integrity or the operation of the dam under normal operational conditions and requires remedial action to resolve.
 Critical design information is needed to evaluate the potential performance of the dam. For example, a field observation or a review of the dam’s performance history has identified a question that can only be answered by review of the design and construction history for the dam.

Uncertainty arises when there is no design and/or construction documentation available for review and additional analysis is needed to better understand the risk associated with operation under normal operational conditions.
 Interim or permanent risk reduction measures may be under consideration.

Unsatisfactory A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.

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Typical Circumstances:
 A critical component of the dam has deteriorated to unacceptable condition or failed.
 A safety inspection indicates major structural distress (excessive uncontrolled seepage, cracks, slides, sinkholes, severe deterioration, etc.), advanced deterioration, or operational deficiencies which could lead to failure of the dam or its appurtenant structures under normal operating conditions.
 Reservoir restrictions or other interim risk reduction measures are required.
 A partial or complete reservoir drawdown may be mandated by the state or federal regulatory agency.

Not Rated The dam has not been inspected, is not under state jurisdiction, or has been inspected but, for whatever reason, has not been rated.

Location and Extent
Critical dams and reservoirs with the potential to inundate parts of the City are identified in Table 4-2, Dams With Inundation Areas Affecting Glendora and shown on Figure 4-1, Dams With Inundation Areas Affecting Glendora. DSOD’s downstream hazard potential and condition assessment for each dam and reservoir are also provided in Table 4-2.

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TABLE 4-2: DAMS WITH INUNDATION AREAS AFFECTING GLENDORA Source: Department of Water Resources, Division of Safety of Dams, Dams Within Jurisdiction of the State of California, Dams Listed Alphabetically by Dam Name, September 2023; National Inventory of Dams, Dams of the Nation, https://nid.sec.usace.army.mil/#/, accessed June 4, 2024.

The geographic extent of dam or reservoir failure is dependent on the type of infrastructure and amount of water stored at the time of the hazard incident. Development of maps that show inundation areas in the event of dam failure is the responsibility of the dam’s owner. Inundation maps have been prepared as part of the EAP effort through DSOD and Cal OES. As shown in Figure 4-1, inundation areas occur within a significant portion of the central and southern areas of the City, trending in a southwesterly direction, generally between Little Dalton Wash and Big Dalton Wash, and along San Dimas Wash. Inundation areas include, but are not limited to, residential and commercial uses. A total of 2,168.4 acres within the City and Sphere of Influence (SOI) are located within inundation areas.

Name of Dam Owner Dam Purpose Downstream
Hazard Potential
Condition
Assessment
Little Dalton
Debris Basin
Los Angeles County
Department of Public Works
Debris Control,
Flood Risk
Reduction
Extremely High Satisfactory
Big Dalton
Debris Basin
Los Angeles County
Department of Public Works
Debris Control,
Flood Risk
Reduction
High Satisfactory
Big Dalton Los Angeles County
Department of Public Works
Flood Risk
Reduction, Water
Supply
Extremely High Satisfactory
Puddingstone
Diversion
Los Angeles County
Department of Public Works
Other, Flood Risk
Reduction High Satisfactory
Morgan Debris
Basin
Los Angeles County
Department of Public Works Debris Control High Satisfactory San Dimas Los Angeles County
Department of Public Works
Flood Risk
Reduction,
Irrigation, Water
Supply
Extremely High Satisfactory
SCRRA
Bonnie Cove Ave
SCRRA
Baranca Ave
San Bernardino Rd
Sunflower Ave
Barranca Ave
Leadora Ave
Glendora Ave
Walnut Ave
Covina Blvd
Baseline Rd
Reeder Ave
D St
Valley Center Ave
Loraine Ave
Cienega Ave
Damien Ave
Cypress Ave
Gladstone St
Wheeler Ave
3rd St
Puente St
Fairplex Dr
B St
Puente St
Sierra Madre Ave
Citrus Ave
Route 66
San Dimas Ave
Cypress St
Alosta Ave
Grand Ave
Foothill Blvd
Baseline Rd
Bonita Ave
Glendora Ave Arrow Hwy
Badillo St
30 66
39 210
57 Big Dalton
San Dimas
Puddingstone
Diversion
Little Dalton
Debris Basin Big Dalton
Debris Basin
Morgan
Debris Basin
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
Dam with Inundation Area Affecting Glendora
Dam Failure Inundation Areas affecting Glendora
Nearby Dam Failure Inundation Areas
Figure 4-1. Dams with Inundation
Areas Affecting Glendora

CITY OF GLENDORA, CALIFORNIA
\
0 ½ 1
Miles
Sources: California Department of Water Resources, Division of Dam Safety; Los Angeles County GIS. Map date: December 12, 2024.

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Previous Occurrences
The City of Glendora has not experienced a dam or reservoir failure. Since the 20th century, there have been a total of seven dam incidences deemed as failures in California. Of these, six have been in southern California; refer to Table 4-3, Dam Failures in Southern California. The most recent dam failure occurred in the San Fernando Valley area of Los Angeles County in 1971.

TABLE 4-3: DAM FAILURES IN SOUTHERN CALIFORNIA
Source: Association of State Dam Safety Officials, Dam Incident Database Search, https://damsafety.org/incidents, accessed June 5, 2024.

Probability of Future Occurrences
The primary hazards that could cause failure of the reservoirs and their associated dams are strong earthquake ground shaking, seiche, and liquefaction. Seiches are changes or oscillations of water levels within a confined water body caused by fluctuation in the atmosphere, tidal currents, or earthquakes. All the sites listed in Table 4.1 would be subject to seismic ground shaking, as is the entire southern California region, due to the presence of numerous major faults; refer to the Seismic and Geologic Hazards Profile for more information. In addition, portions of the Little Dalton Debris Basin, Big Dalton Debris Basin, and Puddingstone Diversion are within a mapped liquefaction zone; portions of the Big Dalton, Morgan Debris Basin, and San Dimas are within a mapped landslide zone; and the Big Dalton Debris Basin is underlain by the Sierra Madre fault zone. There have been no dam or reservoir failures near the City and no recent failures within Los Angeles County. Over the years, the State of California has implemented stringent standards, regulations, and regular inspections of dam facilities, including after the Oroville Dam crisis in 2017, requiring additional inundation mapping and emergency preparedness planning.

Additionally, as shown in Table 4-2, all dams with the potential to inundate parts of Glendora have received a condition assessment rating of “satisfactory” by the DSOD. Therefore, the probability of future occurrences of reservoir or dam failure is considered to be unlikely.

Climate Change Considerations
Dam/reservoir failure is not directly correlated to climate change. Dam and reservoir failure could be caused by seismic activity, which is also not caused by climate change. However, ground failure (due to oversaturated soils) compromising infrastructure integrity or heavy rains overtopping dams could occur. Repetitive severe storm events could increase “wear and tear” Name of Dam City/Region County Year Reason for Failure
Lower Otay Chula Vista San Diego 1916 Heavy flooding, overtopped; 30 fatalities Sweetwater Bonita San Diego 1916 Heavy flooding, overtopped; 30 fatalities Sheffield Santa Barbara Santa
Barbara 1925 Earthquake-induced slide
Saint Francis San Francisquito
Canyon
Los Angeles
County 1928 Sudden failure at full capacity due to poor construction; 450 fatalities Baldwin Hills Los Angeles Los Angeles
County 1963 Leak through embankment turned into washout; 5 fatalities San
Fernando/
Van Norman
San Fernando/
Granada Hills
Los Angeles
County 1971 Earthquake-induced slide; failed due to
poor construction
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and require additional maintenance and infrastructure improvements to protect dam and reservoir integrity and function. Largely, dam and reservoir operations occur outside of climate change and are not directly impacted by climate change conditions.

DROUGHT
Description
Drought in its simplest definition is an extremely dry climatic period where the available water falls below a statistical average for a region. Drought is also defined by factors other than rainfall, including vegetation conditions, agricultural productivity, soil moisture, water levels in reservoirs, and stream flow. Droughts or water shortages are a gradual phenomenon, occurring over multiyear periods and increasing with the length of dry conditions. When precipitation is less than normal for a period, the flow of streams and rivers declines, water levels in lakes and reservoirs fall, and the depth to water in wells increases. If dry weather persists and water supply problems develop, the dry period can become a drought. Drought cycles are common in southern California and are influenced by cyclical El Niño and La Niña events.

El Niño and La Niña are opposing weather phenomena that significantly impact global climate patterns.4 El Niño occurs when Pacific trade winds weaken, causing warm ocean water to move eastward toward the Americas. This shift in water temperature alters atmospheric circulation, resulting in wetter conditions and increased flooding in the southern U.S. La Niña, the opposite of El Niño, occurs when trade winds strengthen, pushing more warm water toward Asia and increasing upwelling along the west coast of the Americas. This results in drier conditions in the southern U.S., often resulting in droughts.

The term “drought” can have different meanings depending on how a water deficiency affects day to day activities. Drought is a complex natural hazard, which is reflected in the following four definitions commonly used to describe it:5
 Agricultural – Agricultural drought is based on the impacts to agriculture by factors such as rainfall deficits, soil water deficits, reduced groundwater, or reservoir levels needed for irrigation.
 Hydrological – Hydrological drought is based on the impact of rainfall deficits on the water supply such as stream flow, reservoir and lake levels, and ground water table decline.  Meteorological – Meteorological drought is based on the degree of dryness or rainfall deficit and the length of the dry period.
4 National Oceanic and Atmospheric Administration, What are El Niño and La Niña?, https://oceanservice.noaa.gov/facts/ninonina.html, accessed June 10, 2024.
5 National Oceanic and Atmospheric Administration, Understanding Drought and How to Respond, https://www.weather.gov/safety/drought, accessed June 5, 2024.

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 Socioeconomic – Socioeconomic drought is based on the impact of drought conditions (meteorological, agricultural, or hydrological drought) on supply and demand of some economic goods. Socioeconomic drought occurs when the demand for an economic good exceeds supply as a result of a weather-related deficit in water supply.

Although climate is a primary contributor to hydrological drought, other factors such as changes in land use (i.e., deforestation), land degradation, and the construction of dams all affect the hydrological characteristics of a region. Since regions are interconnected by natural systems, the impact of meteorological drought may extend well beyond the borders of the precipitation-deficient area. Changes in land use upstream may alter hydrologic characteristics such as infiltration and runoff rates, resulting in more variable stream flow and a higher incidence of hydrologic drought downstream. Land use change is one way human actions alter the frequency of water shortage even when no change in precipitation has been observed.

Droughts cause public health and safety impacts, as well as economic and environmental impacts. Public health and safety impacts are primarily associated with catastrophic wildfire risks and drinking water shortage risks for small water systems in rural areas and private residential wells. Examples of other impacts include costs to homeowners due to loss of residential landscaping, degradation of urban environments due to loss of landscaping, agricultural land fallowing and associated job loss, degradation of fishery habitat, and tree mortality with damage to forest ecosystems. Drought conditions can also result in damage to older infrastructure that is located within dry soils with potential to leak or break. Dead or dying vegetation poses a risk to falling and damaging structures and infrastructure systems.

In Los Angeles County, drought conditions typically result in implementation of large-scale conservation efforts, reducing water supplies to customers and altering the pricing system by implementing higher rates for water usage that exceeds certain levels (i.e., wasteful). Higher rates that may be imposed during a drought could have disproportionate impacts on lower-income households. Reduction in groundwater supplies during drought conditions can also result in the need for water agencies that have high reliance on local groundwater supplies to purchase larger amounts of imported water. Drought conditions have also resulted in drier brush and an increase in the size and severity of wildfires; refer to the Wildfire Hazard Profile for further discussion.

Location and Extent
Droughts are generally widespread events that could easily affect the entire City of Glendora, and the larger Los Angeles County region. The geographic extent of drought conditions could extend to every resident and business owner receiving water from the City of Glendora Water Division, Suburban Water Systems, and the City of Azusa Light & Water Department, the water suppliers for the City. These three water suppliers rely on imported water from other regions (e.g., Colorado River and Northern California) via aqueducts. As a result, droughts can be caused or made worse by conditions in the regions in which the water originates.

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Drought severity depends on numerous factors, including duration, intensity, geographic extent, as well as regional water supply demands by humans and vegetation. The severity of drought can be aggravated by other climatic factors, such as prolonged high winds and low relative humidity.

The magnitude of drought is usually measured in time and the severity of the hydrologic deficit.

The U.S. Drought Monitor is a map released weekly that indicates the portions of the United States that are experiencing drought and the severity of the drought based on five classifications:
abnormally dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought: moderate (D1), severe (D2), extreme (D3), and exceptional (D4); refer to Table 4-4, Drought Severity Classification.

TABLE 4-4: DROUGHT SEVERITY CLASSIFICATION
Category Description Possible Impacts
D0 Abnormally Dry Active fire season begins; dryland crop germination is stunted; soil is dry; snowpack is minimal.

D1 Moderate
Drought
Dryland pasture growth is stunted; landscaping and gardens need irrigation earlier; wildlife patterns begin to change; stock ponds and creeks are lower than usual. .

D2 Severe
Drought
Fire season is longer, with high burn intensity, dry fuels, and large fire spatial extent; river flows decrease; reservoir levels are low, and banks are exposed.

D3 Extreme
Drought
Fire season lasts year-round; water conservation rebate programs increase; water use restrictions are implemented.

D4 Exceptional
Drought
Water shortages are widespread; surface water is depleted; poor air quality affects health; fields are left fallow.

Source: U.S. Drought Monitor, Drought Classification, https://www.droughtmonitor.unl.edu/About/AbouttheData/DroughtClassification.aspx, accessed June 3, 2024; U.S. Drought Monitor, California, https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx?CA, accessed June 3, 2024.

The Drought Monitor is not a forecast but looks backward, providing a weekly assessment of drought conditions based on how much precipitation did or did not fall. Because drought is a slowmoving hazard, it may take more than one good rainfall to end a drought, especially if an area has been in drought for a long time.

Figure 4-2, Drought Monitor Map, depicts the drought monitor map, which identifies areas of drought and labels them by intensity as shown in Table 4-3. As of February 18, 2025, Los Angeles County is classified as D1, D2, and D3 by the U.S. Drought Monitor, meaning parts of the County are currently experiencing moderate-to-extreme drought conditions. Glendora is identified as D2, meaning it is experiencing severe drought conditions.

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FIGURE 4-2: DROUGHT MONITOR MAP
Source: United States Drought Monitor, California, https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx?CA, accessed February 25, 2025.

Previous Occurrences
Although defining drought can be challenging across a large geography, California has experienced numerous severe droughts over the past century. FEMA declared one drought emergency for California in January 1977, and other drought emergency declarations have been declared by the State. According to the 2023 State Hazard Mitigation Plan, from 1950 to 2022, there were 11 drought State Emergency Proclamations in California.6 Table 4-5, Historical Droughts, shows the historical droughts that have occurred in California from 1827 through the present.
6 California Governor’s Office of Emergency Services, 2023 California State Hazard Mitigation Plan, https://www.caloes.ca.gov/wpcontent/uploads/Hazard-Mitigation/Documents/2023-California-SHMP_Volume-1_11.10.2023.pdf, published August 2023, accessed June 4, 2024.

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TABLE 4-5: HISTORICAL DROUGHTS
Date Area Affected Notes
1827-1916 Statewide
Multiyear: 1827–29, 1843–44, 1856–57, 1863–64
(particularly extreme), 1887–88, 1897–1900, 1912–

13. 1917-21 Statewide except central Sierra
Nevada and north coast
Simultaneous in affected areas, 1919–20. Most
extreme in north.
1922–26 Statewide except central Sierra
Nevada
Simultaneous in effect for entire State only during
1924, which was particularly severe.
1928-37 Statewide Simultaneously in effect for the entire State, 1929–

34. Longest, most severe in State’s history.
1943–51 Statewide Simultaneously in effect for entire State, 1947–49.

Most extreme in south.
1959–62 Statewide Most extreme in Sierra Nevada and central coast. 1976–77 Statewide, except for
southwestern deserts
Driest 2 years in State’s history. Most severe in
northern two-thirds of State.
1987–92 Statewide Moderate, continuing through 1989. Most extreme in northern Sierra Nevada.
2000-2002 Statewide Most severe in southern California. 2007-2009 Statewide Twelfth driest 3-year period on record at the time.

Most severe in western San Joaquin Valley.
2012-17 Statewide Most severe California drought on record. 2021-23 Statewide
Drought emergency proclamation issued in April
2021 with additional orders May 2021, July 2021,
October 2021, and October 2022. Drought
restrictions eased in March 2023.

Source: Paulson, Chase, Roberts, and Moody, National Water Summary 1988-89-- Hydrologic Events and Floods and Droughts, 1991; California Department of Water Resources, California’s Most Significant Droughts: Comparing Historical and Recent Conditions, February 2015; California Governor’s Office of Emergency Services, 2023 California State Hazard Mitigation Plan, August 2023.

The most severe drought on record began in 2012 and continued through 2016. On January 17, 2014, the governor of California declared a State drought emergency, and on April 1, 2014 the governor announced the first-ever mandatory 25 percent statewide water use reduction and a series of actions to help save water, increase enforcement to prevent wasteful water use, streamline the State’s drought response, and invest in new technologies that would make California more drought resilient. At the time of the announcement, the volume of snowpack in California’s mountains was approximately 14 percent of normal. Despite multiple storms in February 2014, drought conditions persisted. By the end of May 2014, all of California was in a condition of “extreme” or “exceptional” drought. At the same time, the volume of snowpack had decreased to less than 10 percent of normal and water stored in Statewide Reservoirs was at 56 percent of normal.
7 On April 7, 2017, the governor issued an executive order ending the drought emergency in Southern California, including Los Angeles County.

On October 19, 2021, the governor of California declared a State drought emergency, which added the eight counties, including Los Angeles County (not included within an executive order 7 California Department of Water Resources, California’s Most Significant Droughts: Comparing Historical and Recent Conditions, February 2015.

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in April, May, or July 2021) calling for a voluntary reduction of water use by 15 percent across California. 8 This declaration followed the second driest year on record and near record low storage in California’s largest reservoirs. The proclamation required local water suppliers to implement water shortage contingency plans responsive to local conditions and prepare for the possibility of a third dry year. On March 28, 2022, the governor issued an executive order noting continued drought conditions and requiring urban water suppliers to activate, at a minimum, Level 2 of their customized Water Shortage Contingency Plans. These plans, required by State law, are developed by local water agencies to navigate drought and each plan is customized based on an agency’s unique infrastructure and management. Triggering Level 2 of these plans involves implementing water conservation actions to prepare for a water shortage level of up to 20 percent.

For example, in many communities, this would mean reducing the number of days that residents can water outdoors, among other measures. On March 24, 2023, the governor rolled back some drought emergency provisions that were no longer needed due to improving water conditions, while maintaining other measures that support regions and communities still facing water supply challenges, and that continue building up long-term water resilience. 9 The City of Glendora Water Division provides water conservation programs and resources, including education programs, free water efficiency upgrades and rebates, water smart gardening workshops, water saving tips, and leak reporting. 10 During drought conditions, the City of Glendora Water Division educates residents and business owners regarding State-mandated water conservation measures. The City’s Municipal Code (Chapter 14.34, Water Conservation and 21.03.060, State Model Water Efficient Landscaping Ordinance Adopted by Reference) includes water conservation and landscape water use standards, guidelines, and calculations to promote conservation and efficient use of water in the City.

Probability of Future Occurrences
Based on previous occurrences and trends in California, the likelihood that Glendora will experience drought conditions in the future is considered high. The U.S. Seasonal Drought Outlook depicts large-scale trends based on U.S. Drought Monitor areas (intensities of D1 to D4), as shown in Figure 4-3, U.S. Seasonal Drought Outlook. The coastal southern California region, including Glendora, is currently showing drought tendencies that are likely to persist. The probability of future occurrences is considered highly likely. 8 California Governor’s Office, Proclamation of a State of Emergency, October 2021. 9 Governor Gavin Newsom, Governor Newsom Eases Drought Restrictions, https://www.gov.ca.gov/2023/03/24/governor-newsom-easesdrought-restrictions/, accessed June 5, 2024. 10 City of Glendora, Water Conservation, https://www.cityofglendora.org/departments-services/public-works/water/water-conservation, accessed June 5, 2024.

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FIGURE 4-3: U.S. SEASONAL DROUGHT OUTLOOK
Source: National Weather Service Climate Prediction Center, U.S. Seasonal Drought Outlook, https://www.cpc.ncep.noaa.gov/products/expert_assessment/season_drought.png, accessed February 25, 2025.

Climate Change Considerations
Climate change can exacerbate droughts by making them more frequent, longer, and more severe. According to the 2023 State Hazard Mitigation Plan, there is a high probability of future drought events in the State, with at least one period of drought occurring somewhere in California every year. Climate scientists studying California find that drought conditions are likely to become more frequent and persistent over the twenty-first century due to climate change, such as more frequent and extended periods of high temperature conditions. Decreasing snowmelt, reduced precipitation, and higher temperatures are all expected effects of climate change. The California Adaptation Planning Guide states that the pressure climate change places on ground water reliance during times of drought is not sustainable. California’s Fourth Climate Change Assessment states that California has experienced a succession of dry spells, and with warmer conditions the impacts of these droughts have increased. Additionally, recent droughts (2012- 2016 and 2020-2022) have been followed by very wet winters, providing further indication of continued climate volatility. Increasing populations and increasing demand for water in southern Glendora Local Hazard Mitigation Plan
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portions of California are anticipated to continue and may result in future challenges associated with drought conditions and climate change for Glendora and other communities.

Governor Brown’s 2014 drought emergency declaration noted that droughts could occur more regularly into the future. Additionally, Governor Newsom’s 2022 executive order notes that climate change continues to intensify the impacts of droughts. The experiences faced by water supply agencies during the recent and current droughts have prompted actions to examine water storage, distribution, management, conservation, and use policies more closely. Water districts drafted administrative drought actions and implemented mechanisms allowing for administrative consistency and coordination to address drought conditions statewide.

FLOOD
Description
Flooding occurs when a waterway, either a natural one or an artificial drainage channel, receives more water than it is capable of conveying, causing the water level in the waterway to rise.

Depending on how long these conditions last and the amount of water the waterway receives in proportion to its capacity, the rising water level may eventually overtop the waterway’s banks or any other boundaries to the drainage area, resulting in flooding in the surrounding area.

Floods often occur during heavy precipitation events, when the amount of rainwater exceeds the capacity of storm drains or flood control channels. Floods can also happen when infrastructure such as levees, dams, or culverts fail, or when a section of drainage infrastructure fails, and water cannot be drained from an area fast enough. These failures can be linked to precipitation events (i.e., when water erodes away a levee, allowing water to escape and flood nearby areas), or can be a consequence of other emergency situations (i.e., a dam collapsing due to an earthquake).

FEMA defines flood or flooding as a general and temporary condition of partial or complete inundation of normally dry land areas from:
 The overflow of inland or tidal waters;
 The unusual and rapid accumulation or runoff of surface waters from any source; or,  Mudslides (i.e., mudflows) which are proximately caused by flooding and are akin to a river of liquid and flowing mud on the surfaces of normally dry land areas, as when earth is carried by a current of water and deposited along the path of the current.

Floods can be caused by several factors, including:
 Weather and climate patterns (e.g., El Niño, La Niña, Pineapple Express, Atmospheric River, etc.)
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 El Niño and La Niña are complex weather patterns resulting from variations in ocean temperatures in the equatorial Pacific. Warmer or colder than average ocean temperatures in one part of the world can influence weather around the globe. El Niño and La Niña episodes typically last 9 to 12 months, but some prolonged events may last for years.11
 Pineapple Express is a name given to an atmospheric river on the West Coast. It is a channel in the atmosphere that moves vast amounts of moisture and can result in massive showers.
 Hydrologic features such as reservoirs, ponds, lakes, rivers, etc. can have a large impact on the amount of flooding.
 The absorption capacity of the ground depends on the composition of soil and bedrock of the area. Less absorbent soil conditions in addition to lack of proper storm infrastructure can result in flooding.
 Type and density of vegetation is related to absorption of moisture affecting the flow of water.  Patterns of land use/urbanization relates to the pervious and impervious nature of the ground.  Expected level, age, and condition of flood management infrastructure will impact flooding conditions.
 Large-scale wildfires dramatically alter the terrain and ground conditions. Vegetation absorbs rainfall, reducing runoff. However, wildfires leave the ground charred, barren, and unable to absorb water, creating conditions ripe for flash flooding and mudflow. Flood risk remains significantly higher until vegetation is restored – up to five years after a wildfire.12 The force of a flood can be enough to carry away large objects and damage structures, causing considerable damage to buildings and infrastructure. In severe instances, floodwaters themselves can destroy structures or move them off their foundation. Floods can saturate and weaken soil, potentially making structures built on them more susceptible to damage or collapse. Flooding can affect water quality, as large volumes of water can transport contaminants into water bodies and overload storm and wastewater systems. Additionally, large increases in water volume can cause water body erosion and loss of aquatic habitat. It can also cause great economic loss to people and government due to the destruction of roads, bridges, farms, businesses, houses, and automobiles.
11 National Oceanic and Atmospheric Administration, What are El Niño and La Niña?, https://oceanservice.noaa.gov/facts/ninonina.html, accessed June 10, 2024.
12 Federal Emergency Management Agency, Flood Risks Increase After Fires, https://www.fema.gov/sites/default/files/documents/fema_floodafter-fire_factsheet_nov20.pdf, accessed June 4, 2024.

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Location and Extent
The City is adjacent to the San Gabriel Mountains and located within the San Gabriel River Watershed. The San Gabriel River Watershed is in the eastern portion of Los Angeles County where it is bounded by the San Gabriel Mountains to the north, San Bernardino/Orange County to the east, the division of the Los Angeles River from the San Gabriel River to the west, and the Pacific Ocean to the south.13 The watershed drains into the San Gabriel River from the San Gabriel Mountains flowing 58 miles south until its confluence with the Pacific Ocean. Three flood channels traverse Glendora: Little Dalton Wash, Big Dalton Wash, and San Dimas Wash. The concreted-lined channels serve as floodways that manage floodwater flow.

Flood zones within Glendora are determined by Flood Insurance Rate Maps (FIRMs), produced by FEMA in partnership with various communities. A FIRM is the official flood map that shows a community’s flood hazard areas. These may include high-hazard (Special Flood Hazard Areas [SFHA]), moderate- to low-hazard areas, and undetermined areas. A SFHA map shows the 100- year floodplain, divided into zones A and AE.14 A FIRM also includes 500-year floodplains and higher, classified as moderate and minimal risk areas. The extent or magnitude of flooding is measured by percentage and annual chance floods. A 100- and 500-year flood is an event that has a 1 in 100 (1 percent) and 1 in 500 (0.2 percent) chance, respectively, of occurring in any given year. This data is incorporated into FIRMs to support the National Flood Insurance Program (NFIP) and provide the basis for community floodplain management regulations and flood insurance requirements.

A regulatory floodway is a subset of the 100-year floodplain and is defined by FEMA as the channel of a river or other watercourse and the adjacent land areas that must be reserved to discharge the base flood without cumulatively increasing the water surface elevation more than a designated height. Communities must regulate development in these floodways to ensure that there are no increases in flood elevations.

Figure 4-4, Flood Hazard Zones, shows the locations of flood zones in Glendora, and Table 4-6, Acreage by FEMA Flood Zones, provides the details and acreage of these zones that occur within the planning area. The majority of developed areas in Glendora are identified as Zone X, meaning that the area is located outside of SFHAs and have minimal risk of flood hazard. Potential flooding could occur in a northwestern portion of the City mapped within the 500-year floodplain, generally located along Sierra Madre Avenue. Additionally, a significant portion of the City has not been mapped for flood hazards by FEMA. These unmapped areas occur in the northern and eastern foothills of the City and generally consist of open space and low-density residential uses.

Development within flood hazard areas is expected to comply with flood protection standards that reduce vulnerability to flood impacts and ensure safe use and occupation of structures. 13 County of Los Angeles Public Works, San Gabriel River Watershed, http://www.ladpw.org/wmd/watershed/sg/, accessed July 7, 2023. 14 Federal Emergency Management Agency, National Flood Insurance Program, Flood Insurance Manual, April 2024, https://www.fema.gov/sites/default/files/documents/fema_nfip_flood-insurance-manual_042024.pdf, accessed June 10, 2024.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
SCRRA
SCRRA
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
100-year Flood Zone
100-year Flood Zone
(contained in channel)
500-year Flood Zone
Area of Minimal Flood Hazard
No Flood Hazard Study has
been Conducted
Figure 4-4. Flood Hazard Zones

CITY OF GLENDORA, CALIFORNIA
\
0 ¼ ½
Miles
Sources: FEMA National Flood Hazard Layer, Los Angeles County, 10-19-2023; Los Angeles County GIS. Map date: December 12, 2024. unshaded
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TABLE 4-6: ACREAGE BY FEMA FLOOD ZONES
Flood Risk Area (Acres)
100-Year Flood and Regulatory Floodway High 0.0
500-Year Flood Moderate to Minimal 49.8
Area of Minimal Flood Hazard (Zone X) Minimal 5,859.3
Undetermined/No Study Conducted (Zone D) Undetermined 7,333.5 Source: Federal Emergency Management Agency, June 18, 2024.

Flooding can also occur outside of mapped flood hazard zones during heavy rain events associated with extensive runoff. Localized flooding typically occurs when significant amounts of rain fall over a short time and/or, because of overloaded or blocked stormwater drainage systems that cause sheet flow into streets and low-lying areas.

Previous Occurrences
Past occurrences of flood damage in the City of Glendora have occurred as early as 1938, when one of the worst rainstorms on record caused overflow of the Little Dalton Wash channel and street flooding throughout the City.
15 Another significant flood event affecting the City of Glendora occurred in 1969 and was caused by intense rainfall.16 The 1969 flood event had a significant impact, particularly in the northern part of the City, where flooding and mudslides caused over 50 million dollars in damages to private and public properties. Improvements to City and County flood control systems after these events has greatly reduced the flooding hazard in Glendora. 15 The Glendora Press-Gleaner, Glendora Escapes with Minor Damage as Rain Floods Southland Area, March 4, 1938, https://ccdl.claremont.edu/digital/collection/cwd/id/4756, accessed June 10, 2024. 16 U.S. Geologic Survey, Flood of January 1969 near Azusa and Glendora, California, https://pubs.er.usgs.gov/publication/ha424, accessed June 10, 2024.

Source: Ralls, T., ABC 7, Rain floods Southern California roads, https://abc7.com/rain-flooding-mud-slide-socalcamarillo-glendora-silverado-flow-debris-southern-california-la/419008/, accessed November 21, 2024.

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The National Weather Service report, A History of Significant Weather Events in Southern California, includes a chronological list of events organized by weather type. 17 One of these events specifically mentions heavy rainfall occurring in Glendora in 1956. Additionally, the National Oceanic and Atmospheric Administration (NOAA) Storm Event Database summarizes flood events of regional significance affecting the City of Glendora. These are documented below:18
 In May 1998, heavy rain produced local urban flooding across Los Angeles County. Local street flooding was reported in Glendora.
 In April 1999, moderate to locally heavy rainfall produced minor street flooding across coastal areas of Ventura and Los Angeles counties.
 In February 2000, heavy rain totaling two to six inches produced flash flooding across Santa Barbara, Ventura, and Los Angeles counties. Flash flooding and mudslides closed parts of San Gabriel Canyon Road in the Angeles National Forest. The heavy showers resulted in numerous reports of street flooding across the area.
 In March 2000, heavy showers produced widespread street flooding across Los Angeles County.
 In April 2000, a powerful Pacific storm brought heavy rain, causing urban flooding in Los Angeles County.
 In March 2001, Los Angeles county received one to three inches of heavy rainfall, with numerous reports of flooding and mudslides.
 In February 2003, a powerful winter storm brought heavy rain to southern California. Rainfall totals over coastal areas ranged from one to five inches with higher amounts in the mountains.

Widespread flooding was reported across Los Angeles County.  In January 2005, a powerful Pacific storm brought heavy rain, snow, flash flooding, high winds and landslides to central and southern California. During the five-day event, rainfall totals ranged from three to 10 inches over coastal areas with up to 32 inches in the mountains  In January 2008, a powerful Pacific storm brought strong winds, heavy rainfall, flash flooding, and winter storm conditions to central and southern California. Rainfall totals ranged from five to 11 inches in the foothills and mountains. The heaviest rainfall fell over favored south-facing mountain slopes.
 In January 2010, a series of powerful winter storms affected central and southern California.

As this series of storms moved across the area, they brought heavy rain, flash flooding, gusty 17 National Weather Service, A History of Significant Weather Events in Southern California, https://www.weather.gov/media/sgx/documents/weatherhistory.pdf, March 2024. 18 National Oceanic and Atmospheric Administration, Storm Events Database, https://www.ncdc.noaa.gov/stormevents/, accessed Jun 10, 2024.

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winds, heavy snow, and severe weather to the area. Rainfall ranged from eight to 16 inches in the foothills and mountains.
 In February 2014, heavy showers and thunderstorms moved across the communities of Azusa and Glendora, generating flash flooding and debris flows. Rainfall totals ranged from between six and 12 inches across the mountains and foothills. Law enforcement reported that several homes were damaged due to debris flows.
 In January 2016, a powerful winter storm brought heavy rain and snow, flash flooding, and gusty winds to the Los Angeles area. Rainfall totals from this storm generally ranged between two and six inches with locally higher amounts in some foothill areas.  In December 2021, a winter storm hit southern California, producing heavy rainfall ranging between two to eight inches. Numerous reports of nuisance roadway flooding as well as downed trees were reported.
 In August 2023, Tropical Storm Hilary brought heavy rain and significant flooding to Ventura and Los Angeles counties. Rainfall totals in mountain areas ranged between three to nine inches. Rainfall rates were impressive, with rates of around one inch in less than an hour reported at times. With such heavy rainfall, numerous reports of flash flooding as well as mud and debris flows were received.

Probability of Future Occurrences
This section addresses flooding resulting from heavy precipitation events, distinct from flooding caused by reservoir or dam failure, which was covered in the previous section. Areas within the 100-year flood zone have a 1 percent chance of flooding in any given year. However, Glendora has no areas within this high-risk zone. The 500-year flood zone, with a much lower risk of flooding (0.2 percent chance per year), includes a small area of approximately 49.8 acres in the northwestern part of the city, near Sierra Madre Avenue. Flooding incidents are most likely to occur within FEMA-designated flood zones.

The City and County maintain an extensive storm drain system that would normally divert any excessive rainfall into appropriate channels. After the historic flooding events discussed above, the City made improvements to infrastructure such as the construction of dams, basins, and flood control channels to mitigate flood hazards. These improvements decrease the probability of a major flood occurrence in the City. Additionally, the City prohibits development in any area determined to be subject to flood hazard by reason of inundation, overflow, or erosion unless provisions are made to eliminate the hazards to the satisfaction of the City Engineer by providing adequate drainage facilities, protective walls or devices, suitable fill, raising the floor level of the structures, or by a combination of methods. The City also prepares for flood events by maintaining and proactively removing debris prior to significant rain events. However, infrastructure and flood control facilities could be overwhelmed during a large storm event, resulting in flooding not limited to the FEMA flood zones. The probability of future occurrences is considered likely.

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Climate Change Considerations
Climate change is expected to influence the frequency and intensity of precipitation events throughout California and could have a direct effect on flooding. According to research conducted by UCLA, California will experience extremely wet and extremely dry seasons by the end of the century. It is predicted that “over the next 40 years, the State will be 300 to 400 percent more likely to have a prolonged storm sequence as severe as the one that caused the legendary California flood more than 150 years ago.”19 The Fourth Climate Change Assessment indicates the intensity of heavy precipitation events is increasing and identifies a medium-high confidence for future change. While the annual rainfall averages may remain constant, the wet season may be narrower, leading to large downpours in a short period of time that overwhelm infrastructure and lead to increased flooding. With population density and increased urbanization of Los Angeles County, increased precipitation events and associated flooding could be devastating. 19 Colgan, D. (UCLA), Study forecasts a severe climate future for California, April 2018, https://newsroom.ucla.edu/releases/california-extremeclimate-future-ucla-study, accessed June 10, 2024.

Source: City of Glendora, February 28, 2014.

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SEISMIC AND GEOLOGIC HAZARDS
Description
Surface Faulting and Ground Motion
The US Geological Survey (USGS) defines an earthquake as a sudden slip on a fault and the resulting ground shaking and radiated seismic energy caused by the slip (or any other sudden stress changes in the earth).20 Faults are fractures along the earth’s crust between two blocks of earth and can be defined as a strike slip, normal, or thrust faults, as depicted in Figure 4-5, Types of Faults, below.

FIGURE 4-5: TYPES OF FAULTS
Source: U.S. Geological Survey, Earthquake Hazards Program, https://www.usgs.gov/programs/earthquake-hazards, accessed June 11, 2024.

Fault movement can occur rapidly, in the form of an earthquake, or may occur slowly, in the form of creep. During an earthquake, the rock on one side of a fault suddenly slips with respect to the other. Earthquakes occur without warning and result in effects such as ground motion, surface faulting, and ground failure (including liquefaction and landslides), described below.

Ground motion is seismic shaking (vibration) of the ground during an earthquake.21 When a fault ruptures, seismic waves radiate in all directions and cause the ground to vibrate. The severity of the vibration increases with the amount of energy released and decreases with distance from the causative fault or epicenter. Soft soils can further amplify ground motion.

Seismic shaking can be strong enough to result in widespread devastation or virtually undetectable by the average person. The intensity of seismic shaking is a result of the release by the fault rupture (how much of the accumulated stress was released), the length of the rupture (the longer the slip along the fault line, the greater the shaking), and the depth at which the rupture occurs (ruptures that occur closer to the surface often cause stronger shaking). Usually, areas 20 U.S. Geological Survey, Earthquake Hazards Program, https://www.usgs.gov/glossary/earthquake-hazards-program, accessed June 11, 2024.
21 U.S. Geological Survey, What are the Effects of Earthquakes?, https://www.usgs.gov/programs/earthquake-hazards/what-are-effectsearthquakes, accessed June 11, 2024.

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closest to the site of the rupture experience the greatest shaking, although differences in geology and soil can also have an impact.

Seismic shaking can damage or destroy buildings and structures and may cause partial or total collapse. Ground movement can damage or destroy infrastructure on or beneath the surface, such as roads, rail lines, and utility lines and pipes. This in turn, can cause hazardous materials releases, water main breaks, and other dangerous situations resulting from infrastructure failure.

Falling debris and structures also create a risk of personal injury or death.

Surface faulting is the differential movement of two sides of a fracture, where the ground breaks apart. The length, width, and displacement of the ground characterize surface faults, which occur based on the type of underlying fault.

Faults occur at the boundaries between large sections of the earth’s surface, called tectonic plates. While most of California sits on the North American plate, the San Gabriel Valley area (which includes the City of Glendora) is on the Pacific plate. The San Andreas Fault is the main boundary between the North American and Pacific plates, but other fault lines can be found up to 200 miles away. The presence of the San Andreas Fault and other faults is the reason for California’s frequent seismic shaking and other tectonic activity.

Landslides, Mudflows, and Slope Instability
Areas with steep slopes and valleys are potentially subject to instability. These areas may be prone to hazards such as rock falls, slope failures, and debris flows (mudflows). While seismic shaking can cause landslides, other causes can include erosion, soil saturation, excess weight from accumulation of rain or snow, and human-made conditions such as construction disturbance or vegetation removal.

When a hillside or other slope becomes unstable, the soil and rocks that make up the slope slide toward the bottom. Landslides are often sudden, although some occur very slowly over a long period of time. Loose and fractured materials are more likely to slide than compact materials or solid rock, and steep slopes are at greater risk than gentle rises. Areas that have been recently burned by wildfires are more susceptible to sliding because the fire destroys the plant cover that helps stabilize slopes.

Regardless of the cause or specific form, a landslide can damage or destroy structures built on the sliding material or in its path. Underground infrastructure, such as pipelines or telecommunication lines, may be severed during a landslide. This could lead to infrastructureinduced flooding if water pipes are broken. In addition to property damage, landslides can crush or bury people, creating a risk of serious injury or death.

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Liquefaction
Liquefaction is a phenomenon that occurs when ground shaking causes saturated soils, primarily clay-free deposits such as sand or silt, to lose strength and act like a viscous fluid. Soils that are poorly consolidated and combine with groundwater during an earthquake lose their shear strength and take on the properties of a heavy liquid. Certain soils are more susceptible to liquefaction, particularly younger and looser sediment closer to the water table. Liquefaction causes three types of ground failure, as described below:22
 Lateral spreads involve the lateral movement of large blocks of soil as a result of liquefaction of an underlying layer. They generally develop on gentle slopes, most commonly between 0.3 and 3 degrees. Horizontal movements commonly are as much as 10 to 15 feet. However, where slopes are particularly favorable, and the duration of ground shaking is long, lateral movement may be as much as 100 to 150 feet. Lateral spread usually breaks up internally, forming numerous fissures and scarps.
 Flow failures consist of liquefied soil or blocks of intact material riding on a layer of liquefied soil and are the most catastrophic type of ground failure caused by liquefaction. They commonly move several feet and up to dozens of miles under certain conditions. Flow failures usually form in loose saturated sands or silts on slopes greater than three degrees.  Loss of bearing strength occurs when the soil supporting buildings or other structures liquefies. When large deformations occur, structures settle and tip. The general subsurface geometry required for liquefaction-caused bearing failures is a layer of saturated, cohesionless soil that extends from near the ground surface to a depth equal to about the width of the building.

Location and Extent
Surface Faulting and Ground Motion
The City of Glendora is located within the seismically active southern California region. The City is underlain by the Sierra Madre Fault Zone, a major fault zone which runs along the southern margin of the San Gabriel Mountains. In addition, several other major faults are located within the region that could have an impact on the City; refer to Figure 4-6, Regional Fault Map. The San Andreas Fault, considered the most seismically active fault in the southern California region, is located approximately 20 miles northeast of the City.

Earthquakes that could affect the City would most likely originate from the Sierra Madre or San Andreas Fault Zones, described below. These faults are close enough in proximity or expected to generate strong enough shaking that could affect the City. Geologic conditions within the foothill portions of the City could be impacted more severely due to the steep topography and the relative instability of some of the geologic units in this portion of the City. 22 U.S. Geological Survey, What are the Effects of Earthquakes?, https://www.usgs.gov/programs/earthquake-hazards/what-are-effectsearthquakes, accessed June 11, 2024.

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 Sierra Madre Fault Zone: The Sierra Madre Fault Zone consists of east-west trending faults and folds, which extend along the southern margin of the San Gabriel Mountains. This fault zone is approximately 35 miles in length and terminates at Dalton Canyon to the east and at the San Fernando Fault to the west. This fault is composed of five individual segments, which range in activity. Portions of the City overlying this fault are located within Alquist-Priolo Special Study zones; the segments within the City are considered potentially active. Data gathered on this fault suggests that the slip rate ranges from 0.36 to 4 millimeters per year and this fault is expected to generate earthquakes with a magnitude of 6.0-7.0. 23 Faults that
are associated with this fault system include the:
 Cucamonga Fault
 Duarte Fault
 San Fernando Fault
 San Gabriel Fault
 Clamshell-Sawpit Canyon Fault
 Raymond Fault
 San Andreas Fault Zone: The San Andreas Fault Zone, located approximately 20 miles northeast of the City, is a right-lateral strike-slip that extends approximately 745 miles from Cape Mendocino to the Salton Sea. It has caused numerous major earthquakes throughout California’s history and has the potential to cause destructive ground shaking in the southern California region. Data gathered on this fault suggests that the slip rate ranges from 20 to 35 millimeters per year and this fault is expected to generate earthquakes with a magnitude of

6.8-8.0.

Southern California is subject to potential
ground shaking in the event of an
earthquake. Ground shaking can result in
extensive structural damage, injury, and
death. Ground shaking would be particularly
damaging to residential buildings constructed
of wood or reinforced masonry construction,
and to mobile homes. Other buildings that do
not typically perform well in earthquakes are
soft-story buildings. These types of buildings
have a story (typically the first floor) that lacks
adequate strength or toughness due to too
few shear walls.
23 Southern California Earthquake Center, Earthquake Information, https://scedc.caltech.edu/earthquake/sierramadre.html, accessed June 11, 2024.

Source: County of Los Angeles Fire Department, Northridge Earthquake 30th Anniversary: Reflections and Lessons Learned,
https://fire.lacounty.gov/northridge-earthquake-30th-anniversaryreflections-and-lessons-learned/, accessed November 21, 2024.

Eagle Rock fault
Elsinore fault zone
Raymond fault
East Montebello fault
San Andreas fault zone
Upper Elysian Park fault
Stoddard Canyon fault
Central Avenue fault
Pine Mountain fault zone
Sierra Madre fault zone
San Jose fault
San Gabriel fault zone
San Antonio fault
Walnut Creek fault
San Gabriel fault zone
Indian Hill fault
Lower Elysian Park thrust
Puente Hills blind thrust system
Sierra Madre fault zone
Red Hill-Etiwanda Ave fault
Elsinore fault zone
Sierra Madre fault zone
San Andreas fault zone
San Jacinto fault
Icehouse Canyon
fault zone
91 39
30 57
91 39
2 72
19 42
138
60 134
90 210
142
60 71
210
39 2
83 605
605
710
5 210
5 10
105
10 LEGEND
City of Glendora
County Boundary
Quaternary Fault (various colors)
Alquist-Priolo Zone of Required Investigation
Figure 4-6. Regional Fault Map

CITY OF GLENDORA, CALIFORNIA
\
0 1½ 3
Miles
Sources: California Geological Survey; US Geological Survey; California State Geoportal. Map date: December 12, 2024.

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Intensity and Magnitude
Earthquake ground shaking is generally expressed in terms of intensity and magnitude. Several scales may be used to measure the strength or intensity of an earthquake.24 Magnitude scales, like the moment magnitude (Mw), measure the size of the earthquake at its source. An earthquake event has a single magnitude; however, the degree of ground shaking that the earthquake causes varies from place to place based on distance, type of surface material, and other factors. Figure 4-7, Earthquake Shaking Potential, shows the potential for the City to experience earthquake ground shaking. As shown, the entire City is identified as having lower-to-moderate ground shaking potential, with more populated flat areas generally having a higher ground shaking potential than the hillside areas.

In contrast to magnitude, other scales describe earthquake intensity, which can vary depending on distance from earthquake epicenter and local characteristics. The Modified Mercalli intensity scale expresses earthquake intensity experienced at a particular location on a scale of increasing levels of intensity that range from imperceptible shaking to catastrophic destruction. It does not have a mathematical basis; instead, it is an arbitrary ranking based on observed effects. The level of intensity assigned to a specific location is a more meaningful measure of severity to the nonscientist than the magnitude because intensity refers to the effects experienced. Table 4-7, The Modified Mercalli Intensity Scale, lists abbreviated descriptions of the Modified Mercalli intensity levels.
24 U.S. Geological Survey, Earthquake Magnitude, Energy Release, and Shaking Intensity, https://www.usgs.gov/programs/earthquakehazards/earthquake-magnitude-energy-release-andshakingintensity#:~:text=Moment%20Magnitude%20(MW)%20is,magnitude%20range%20where%20they%20overlap, accessed June 11, 2024.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora
MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
Highest
Lowest
Earthquake Shaking Potential for California (rev 2016)
Sphere of Influence
City of Glendora
LEGEND
Figure 4-7. Earthquake Shaking
Potential

CITY OF GLENDORA, CALIFORNIA
\
0 ¼ ½
Miles
Sources: California Geological Survey Map Sheet 48, Earthquake Shaking Potential for California 2016; Los Angeles County GIS. Map date: March 7, 2024. decreasing intensity
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TABLE 4-7: THE MODIFIED MERCALLI INTENSITY SCALE
Intensity Shaking Description/Damage
I Not Felt Not felt except by a very few under especially favorable conditions.

II Weak Felt only by few persons at rest, especially on upper floors of buildings.

III Weak
Felt quite noticeably by persons indoors, especially on upper floors of buildings.

Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibrations similar to the passing of a truck. Duration estimated.

IV Light
Felt indoors by many, outdoors by few during the day. At night, some awakened.

Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.

V Moderate Felt by nearly everyone; many awakened. Some dishes and windows broken.

Unstable objects overturned. Pendulum clocks may stop.

VI Strong Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.

VII Very
Strong
Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken.

VIII Severe
Damage slight in specially designed structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned.

IX Violent
Damage considerable in specifically designed structures; well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations.

X Extreme Some well-built wooden structures destroyed; most masonry and frame structures destroyed with foundations. Rails bent.

Source: U.S. Geological Survey, The Modified Mercalli Intensity Scale, https://www.usgs.gov/natural-hazards/earthquakehazards/science/modified-mercalli-intensity-scale?qt-science_center_objects=0#qt-science_center_objects, accessed June 11, 2024.

Landslides, Mudflows, and Slope Instability
The topography of Glendora includes areas characterized by moderate to very steep hillsides and therefore has the potential for slope instability and landslides. According to the General Plan Safety Element, geologic conditions within the foothill portions of Glendora could be impacted more severely due to the steep topography and the relative instability of some of the geologic units in this area of the City. Such areas may be prone to hazards such as surficial failures, mudflows, debris flows, rock falls, soil creep, and erosion. Failures of human-made slopes could also occur in some of the previously developed areas of the City. In addition, wildfires can destabilize hillsides and create hydrophobic soils, leading to an increased potential of landslides and debris flows. The potential for earthquake-induced landslides in hillside terrain is also present.

Areas of known landslides or areas generally susceptible to landslides and slope instability within Glendora have been identified and mapped by the California Geological Survey (CGS); refer to Figure 4-8, Landslide Hazard Zones. As shown, areas susceptible to landslides include the northern and eastern foothills of the City, as well as the “South Hills” located in the southern portion of the City.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
SCRRA
SCRRA
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
Landslide Zone
Figure 4-8. Landslide Hazard Zones

CITY OF GLENDORA, CALIFORNIA
\
0 ¼ ½
Miles
Sources: California Geological Survey Regulatory Maps Portal; Los Angeles County GIS. Map date: December 12, 2024.

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Liquefaction
Liquefaction generally occurs within areas that have high groundwater (less than 50 feet below the earth’s surface), loose sandy alluvial deposits (usually of recent age), and the potential for significant ground shaking. Available data indicates that groundwater levels beneath the City range between 100 to 150 feet deep. Certain locations, however, have shallow groundwater conditions and could be susceptible to liquefaction. Areas susceptible to liquefaction within the City have been identified and mapped by the CGS; refer to Figure 4-9, Liquefaction Hazard Areas.

As shown, areas susceptible to liquefaction include the northern foothills, a western portion of the City along Foothill Boulevard, and the southeastern portion of the City along Interstate 210 (I210).

Previous Occurrences
Surface Faulting, Ground Motion, and Liquefaction
As discussed above, a variety of faults are located within and near the City of Glendora. Table 4- 8, Major Earthquake Faults of Particular Concern, identifies faults of concern and last major ruptures.

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TABLE 4-8: MAJOR EARTHQUAKE FAULTS OF PARTICULAR CONCERN Fault Name Type of
Faulting
Last Major
Rupture Slip Rate Interval Between Major Ruptures
Probable
Magnitude
(Mw)
Cucamonga Thrust Very recent
Holocene
5 to 14
mm/year
Estimated roughly
between 600-700
years

6.0 – 7.0
Elsinore Right-lateral
strike-slip
May 15, 1910
(Mw6, no surface
rupture observed)
Roughly 4.0
mm/year Roughly 250 years 6.5 – 7.5
Newport
Inglewood
Right-lateral;
local reverse
slip
associated
with fault
steps
March 10, 1933
(Mw6.4, no
surface rupture)

0.6 mm/year Unknown 6.0 - 7.0
Palo Verdes Right-reverse
Holocene,
offshore; Late
Quaternary,
onshore

0.1 to 3.0
mm/year Unknown 6.0 – 7.0
Santa
Monica Left-reverse Late Quaternary 0.27 to 0.39 mm/year Unknown 6.0 – 7.0
San Andreas Right-lateral
strike-slip
January 9, 1857
(Mojave segment)
20 to 35
mm/year
Average of about 140
years on the Mojave
segment; recurrence
interval varies greatly

6.8 – 8.0
San
Fernando Thrust February 9, 1971(Mw6.6). 5 mm/year Roughly 200 years 6.0 – 6.8 San Jacinto Right-lateral
strike-slip
April 9, 1968
(Mw6.5 on
Coyote Creek
segment)
7 to 17
mm/year
Between 100 and
300 years 6.5 – 7.5
Sierra Madre Reverse Holocene 0.36 to 4
mm/year
Several thousand
years

6.0 – 7.0
Sources: Southern California Earthquake Center, Earthquake Information, https://scedc.caltech.edu/earthquake/faults.html, accessed on June 11, 2024.

Notes: mm = millimeters; Mw = moment magnitude
Table 4-9, Significant Historical Earthquakes in Southern California, identifies major earthquakes that have occurred in southern California. The Northridge Earthquake and the Whittier Narrows Earthquake both resulted in major disaster declarations from the federal government, which included Los Angeles County as a designated area.
25 25 Federal Emergency Management Agency, Disasters and Other Declarations, https://www.fema.gov/disaster/declarations, accessed June 12, 2024.

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TABLE 4-9: SIGNIFICANT HISTORICAL EARTHQUAKES IN SOUTHERN CALIFORNIA Earthquake Name Year Estimated Magnitude
Wrightwood 1812 7.5
Santa Barbara Earthquake 1812 7.1
Los Angeles 1855 6.0
Palmdale 1857 6.3
San Bernardino 1858 6.0
Wrightwood 1899 6.4
San Jacinto 1899 6.7
Elsinore 1910 6.0
San Jacinto 1918 6.8
North San Jacinto 1923 6.3
Long Beach 1933 6.4
San Fernando 1971 6.5
Whittier Narrows 1987 5.8
Landers 1992 7.2
Big Bear 1992 6.5
Northridge 1994 6.7
Chino Hills 2008 5.4
Ridgecrest 2019 7.1
Source: Southern California Earthquake Data Center, Significant Earthquakes and Faults, http://scedc.caltech.edu/significant/index.html, accessed June 12, 2024; California Department of Conservation, California’s Big Earthquakes, https://www.conservation.ca.gov/cgs/earthquakes/significant, accessed June 12, 2024; U.S. Geological Survey, Search Earthquake Catalog, https://earthquake.usgs.gov/earthquakes/search/, accessed June 12, 2024.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
SCRRA
SCRRA
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
Liquefaction Zone
Figure 4-9. Liquefaction Hazard Areas

CITY OF GLENDORA, CALIFORNIA
\
0 ½ 1
Miles
Sources: California Geological Survey Regulatory Maps Portal; Los Angeles County GIS. Map date: December 12, 2024.

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Liquefaction-induced ground failure historically has been a major cause of earthquake damage in southern California. During the 1971 San Fernando and 1994 Northridge earthquakes, significant damage to roads, utility pipelines, buildings, and other structures in the Los Angeles area was caused by liquefaction-induced ground displacement.26 According to the CGS Seismic Hazard Zone Reports, no areas of documented historic liquefaction are known within the City limits or the larger Glendora, Azusa, Baldwin Park, and San Dimas Quadrangles. 27 Landslides, Mudflows, and Slope Instability
Like much of California, Los Angeles County has experienced landslides. Landslides in Los Angeles are generally trigged by intense and/or prolonged rainfall but can also occur after an earthquake. 28 There were 17 federally declared landslide disasters in Los Angeles County between 1953 and 2019.
29 CGS landslide mapping identifies numerous landslide events that have occurred in Glendora, specifically within the northern and eastern foothills and South Hills. 30 Significant landslides in Glendora include the 1969 landslide, which destroyed
approximately 175 homes due to debris flow and caused nearly

14.6 million dollars in damages. More recently, Glendora experienced mudflows in 2014 due to heavy winter storms, prompting evacuations in the foothills affected by the Colby Fire.
31 Probability of Future Occurrences
Surface Faulting, Ground Motion, and Liquefaction
The City of Glendora is in a known seismically active area, and thus the probability for future seismic hazard occurrences is considered high. Given the significant seismic shaking events in the region, it is certain that such events will continue. The southern California region has many fault lines (including major faults), and it is almost inevitable that a regional fault line will rupture in the foreseeable future and cause a major seismic shaking event.

The USGS Uniform Earthquake Rupture Forecast Version 3 released in 2017 provides a perspective of the likelihood each California region will experience a magnitude 6.7 or larger earthquake in the next 30 years; refer to Table 4-10, Los Angeles Region Earthquake 26 California Department of Conservation, Division of Mines and Geology, Seismic Hazard Zone Report for the Glendora, Azusa, San Dimas, and Baldwin Park 7.5-Minute Quadrangles, Los Angeles County, California, 1998. 27 Ibid 28 County of Los Angeles, 2020 County of Los Angeles All-Hazards Mitigation Plan, 2020. 29 California Governor’s Office of Emergency Services, California State Hazard Mitigation Plan, November 2023. 30 California Department of Conservation, Landslide Inventory, https://maps.conservation.ca.gov/cgs/lsi/app/, accessed June 13, 2024. 31 Guinyard, T., Lopez, A., and Lloyd J., Glendora Police: Evacuate Before It's Too Late, February 2014, https://www.nbclosangeles.com/news/local/mud-debris-flows-reported-in-glendora/1972470/, accessed June 13, 2024.

Source: City of Glendora, 1969.

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Probabilities, and Table 4-11, Likelihood of One or More Earthquakes Occurring in the Next 30 Years in Los Angeles County Region by Fault.

TABLE 4-10: LOS ANGELES REGION EARTHQUAKE PROBABILITIES Magnitude
(greater than or equal to)
Average Repeat Time
(years)
30-Year Likelihood of One or
More Events

5.0 1.4 100%

6.0 10 96%

6.7 40 60%

7.0 61 46%

7.5 109 31%

8.0 532 7%
Source: U.S. Department of the Interior and U.S. Geological Survey, UCERF3: A New Earthquake Forecast for California’s Complex Fault System Fact Sheet, March 2015.

Notes:

1. M≥5 means magnitude greater than or equal to 5.0, and likewise for the other two magnitude thresholds.

2. The 30-year period measured by this report is 2014 to 2044; a 30-year period is used as it is the typical duration of a homeowner mortgage.

3. Actual repeat times will exhibit a high degree of variability and will almost never exactly equal the average listed in the table above.

TABLE 4-11: LIKELIHOOD OF ONE OR MORE EARTHQUAKES OCCURRING IN THE NEXT 30 YEARS IN LOS ANGELES

COUNTY REGION BY FAULT
Magnitude
Sierra
Madre,
Subsection
2 Cucamonga,
Subsection
3 Elsinore
(Glen Ivy)
rev,
Subsection
0 NewportInglewood alt 2,
Subsection 4
San Andreas
San Bernardino
N), Subsection 1
M≥6.7 1.12% 1.08% 3.21% 0.74% 22.44%
M≥7.0 1.08% 0.98% 1.81% 0.61% 19.74%
M≥7.5 0.72% 0.63% 1.01% 0.27% 16.13%
M≥8.0 0.03% 0.03% <0.01% -- 6.61%
Source: U.S. Department of the Interior and US Geological Survey, The Third California Earthquake Rupture Forecast (UCERF3), Google Earth file with fault probabilities, March 2015.

Notes:

1. M≥6.7 means magnitude greater than or equal to 6.7, and likewise for the other magnitude thresholds.

2. Values shown are the magnitude mean over a 30-year period (2014 to 2044); a 30-year period is the typical duration of a homeowner mortgage.

Based on the data, and the historic occurrences of earthquake activity in southern California, it is concluded that the probability of future occurrences impacting the City is highly likely.

Landslides, Mudflows, and Slope Instability
Glendora's steep topography and geological conditions make it especially vulnerable to slope instability and landslides. Additionally, the City and surrounding San Gabriel Mountains are prone to wildfires, which can further destabilize hillsides and create hydrophobic soils, increasing the likelihood of landslides and debris flows. Earthquake-induced landslides in the area's hillside terrain also pose a risk. Given these factors, the probability of future landslides, mudflows, and other slope stability issues impacting the City is considered highly likely.

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Climate Change Considerations
Surface Faulting, Ground Motion, and Liquefaction
Earthquakes are caused by seismic activity, which is not directly correlated with climate change.

Therefore, climate change is not expected to cause any changes to the frequency or intensity of seismic shaking or liquefaction with Glendora or the region.

Landslides, Mudflows, and Slope Instability
Climate change could bring increased drought conditions, resulting in drier soil conditions, as well as a possibility of increased precipitation levels of greater frequency and duration. Drought conditions cause soil to dry out over time, reducing the ability for soils to absorb precipitation when storms occur. Decreased absorption can result in increased amounts of runoff with the potential for landslide and/or mudflow conditions. More significant or frequent storm events can also result in more precipitation to be absorbed by the soil of slopes in Glendora and could destabilize hillsides and cause an increase in the frequency of landslide events, mudflows, or liquefaction.

Increased temperatures and dry conditions can also result in wildfires. When wildfires burn through an area, they often cause reduced vegetation and destabilization of soil that can also result in landslides or mudflows during intense storm events.

SEVERE WEATHER
Description
Heavy Rains
During severe weather events such as strong storms, rain can fall at such a high rate that it cannot drain away fast enough. Heavy rain can cause flooding, leading to inundation and potential damage to buildings, roadways, and other critical infrastructure. Heavy rainfall conditions can also trigger landslides, mudflow, and slope instability due to the added weight of rain-saturated slopes and weakened slopes from the pressure the groundwater exerts on porous hillside materials. In California, heavy rainfall events are often short, intense bursts of rain, but in some cases, heavy rain can persist for multiple days.

Thunderstorms are rainstorms with lightning that can also include strong winds and hail.

According to the National Weather Service, a severe thunderstorm must have at least one of the following: hail that is one inch in diameter or larger; or winds of 58 miles per hour or greater.32 Such storms form from a combination of moisture, rapidly rising warm air, and a force capable of lifting air, such as a warm front, cold front, or mountain. Typical thunderstorms are 15 miles in diameter and last an average of 30 minutes.
32 National Weather Service, What Constitutes a Severe Thunderstorm, https://www.weather.gov/bmx/outreach_svr, accessed June 13, 2024.

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Lighting is a flash of electrical energy produced by a thunderstorm. Lightning kills approximately 50 people in the United States each year and injures hundreds.33 Lightning can be cloud to air, cloud to cloud, or cloud to ground. Cloud to ground strikes can also be the cause of wildfires.

Santa Ana Winds
Santa Ana winds are warm, dry winds that push dry air from the inland deserts of California and the Southwest over the mountains between coastal California and the deserts. They form when high pressure builds over the desert of the Great Basin region, causing winds to blow from the east toward the Pacific Ocean and lower air pressure offshore. As air moves west from the Great Basin toward California, where pressure is lower, it gains speed as it whips through mountain valleys and passes. The resulting airflow can reach speeds upwards of 30 mph, and gusts of more than twice this speed.34 The phenomenon occurs during the fall and early winter. Santa Ana windstorms can last for several days at a time. These hot and very dry winds dry out vegetation, increasing the fuel available to feed fires. The gusts can also fan flames and spread wildfires.

Extreme Heat
Extreme heat conditions are defined as weather that is much hotter than average for a particular time and place, and sometimes more humid. The heat index is a measure of how hot it feels when relative humidity is factored into the actual temperature. High humidity can cause the heat index to increase drastically and create dangerous health conditions. 35 Typically, the National Weather Service (NWS) issues Excessive Heat Warning/Advisory when the heat index is predicted to be 105°F or greater for two or more consecutive days, although the temperature cut-off varies for different regions.36 Cal-Adapt identifies an extreme heat day or warm night as a day in a year when the daily maximum/minimum temperature exceeds the 98th historical percentile of daily maximum/minimum temperatures based on the historical data from 1961-1990 between April and October. For the City of Glendora, the 98th percentile would be 100.2°F.37 Additionally, Cal-Adapt defines a heat wave as periods of four consecutive extreme days or warm nights when the daily temperature is above the extreme heat threshold.

Power Outage
Power outages are a secondary effect of severe weather events in Glendora. During severe weather incidents, such as high winds, Southern California Edison (SCE), electricity supplier to the City, may implement an operational practice called Public Safety Power Shutoffs (PSPS), to 33 California Governor’s Office of Emergency Services, 2023 California State Hazard Mitigation Plan, https://www.caloes.ca.gov/wpcontent/uploads/Hazard-Mitigation/Documents/2023-California-SHMP_Volume-1_11.10.2023.pdf, published August 2023, accessed June 4, 2024.
34 California Governor’s Office of Emergency Services, 2023 California State Hazard Mitigation Plan, https://www.caloes.ca.gov/wpcontent/uploads/Hazard-Mitigation/Documents/2023-California-SHMP_Volume-1_11.10.2023.pdf, published August 2023, accessed June 4, 2024.
35 U.S. Environmental Protection Agency, Climate Change and Extreme Heat, https://www.epa.gov/sites/default/files/2016- 10/documents/extreme-heat-guidebook.pdf, accessed June 13, 2024. 36 National Weather Service, Heat Watch vs. Warning, https://www.weather.gov/safety/heat-ww, accessed June 13, 2024. 37 Cal-Adapt, Extreme Heat Days & Warm Nights, https://cal-adapt.org/tools/extreme-heat/, accessed June 13, 2024.

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preemptively shut off power in high-risk areas during potentially dangerous fire conditions. This program is designed to proactively prevent electric systems from starting a wildfire when winds and temperatures are high.

Strong Santa Ana winds, high temperatures, and low humidity are all severe weather conditions that could trigger a PSPS event. The frequency of PSPS events depends on weather and environmental factors; SDG&E and SCE make decisions to implement PSPS based on internal thresholds, assessment of real-time information, and situational awareness data. If a PSPS is necessary, SCE communicates with public safety authorities, first responders, and the affected communities. Additionally, customers are notified prior to shutting off power, where conditions allow advanced notification.

When weather forecasts indicate extreme fire conditions, SCE begins predictive modeling to assess potential impacts while monitoring weather watch alerts from the National Weather Service. Leading up to an event, weather forecasts and the potential for wildfire are refined. Two days prior to extreme fire conditions forecasted, SCE would coordinate first with the local government, emergency management community, and first responders. A first notification would go out to customers 48 hours prior to the shut off, a second notification 24 hours prior, and a final notification with power shut off. It is noted that actual or sudden onset of extreme weather conditions could impact coordination and notification efforts.38 Outside of the PSPS events, there is the potential for power outages to occur within the City. SCE defines a major outage as a large, unexpected outage caused by either accidents or natural disasters. While uncommon, loss of electrical power is a potential secondary effect of severe weather events.

Location and Extent
A heavy rain, Santa Ana wind, or extreme heat event would occur throughout the entire City.

While PSPS would only affect certain circuits within the City, a major power outage could affect the entirety of the City, including public infrastructure such as water/wastewater, transportation facilities, and emergency services. Power lines located aboveground are more likely to be impacted during an event. However, local lines are connected to regional lines which are typically located aboveground. Therefore, power outages or interruptions could occur from events not directly impacting the City.

Heavy Rains
One of the indicators for a heavy rain season is the Oceanic Niño Index (ONI), used to monitor the El Niño-Southern Oscillation (ENSO). To calculate the ONI, scientists from NOAA’s Climate Prediction Center calculate the average sea surface temperature in the El Niño 3.4 region (area of the east-central equatorial Pacific Ocean) for each month, and then average it with values from 38 Southern California Edison, Public Safety Power Shutoffs, https://www.sce.com/safety/wildfire/psps, accessed March 20, 2019.

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the previous and following months. This running 3-month average is compared to a 30-year average. The observed difference from the average temperature in that region, whether warmer or cooler, is the ONI value for that 3-month “season.” Based on the ONI, the El Niño (warm) and La Niña (cool) events in the tropical Pacific are categorized as weak, moderate, strong, or very strong.
39 Glendora experiences an average of 21.7
inches of rain per year and experiences an
average of 39 days of precipitation per
year.40 Precipitation is rain, snow, sleet, or
hail that is at least .01 inches on the ground.

Storm drain infrastructure in the City is jointly
owned and operated by the City of Glendora
and the Los Angeles County Flood Control
District (LACFCD). Typically, the City’s
drainage systems can accommodate heavy
rain events, as the City and LACFCD
proactively inspect, clean, and clear catch
basins, flow lines, channels, and other
drainage infrastructure to prevent flooding
and other issues in anticipation of a storm. However, localized flooding has occurred throughout the City, particularly in low spots or where infrastructure is unable to accommodate peak flows during a storm event; refer to the Flood discussion above. In most cases, localized flooding dissipates quickly after heavy rain ceases. During heavy rain events, sandbags are utilized to prevent erosion and runoff into the public storm drain.

Santa Ana Winds
Hurricane winds are measured using the Saffir-Simpson Hurricane Wind Scale. Although hurricane events are not typical within Glendora, the scale can be used to measure strong winds that are not associated with a hurricane event. The scale uses measurements in pressure, wind speed, and damage potential to identify the types of damage associated with sustained wind events; refer to Table 4-12, Saffir-Simpson Hurricane Wind Scale. Depending on the severity of the wind event, any part of the City can be affected by severe winds. 39 National Oceanic and Atmospheric Administration, Climate Variability: Oceanic Niño Index, https://www.climate.gov/newsfeatures/understanding-climate/climate-variability-oceanic-nino-index, published August 30, 2009, accessed June 13, 2024. 40 Best Places, Glendora, CA Climate, https://www.bestplaces.net/climate/city/ca/glendora, accessed June 14, 2024.

Source: Gauthier, R., Los Angeles Times, Los Angeles prepares for rainstorms, https://www.latimes.com/local/la-me-ln-los-angeles-rainstorms-photos-photogallery.html, accessed November 21, 2024.

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TABLE 4-12: SAFFIR-SIMPSON HURRICANE WIND SCALE.

Category Sustained
Wind Speed Description of Damages
1 74–95 mph
Very dangerous winds will produce some damage: Well-constructed frame homes could have damage to roof, shingles, vinyl siding, and gutters. Large branches of trees will snap, and shallowly rooted trees may be toppled. Extensive damage to power lines and poles likely will result in power outages that could last a few to several days. 2 96–110 mph
Extremely dangerous winds will cause extensive damage: Wellconstructed frame homes could sustain major roof and siding damage.

Many shallowly rooted trees will be snapped or uprooted and block numerous roads. Near-total power loss is expected with outages that could last from several days to weeks.
3 111–129 mph
Devastating damage: Well-built framed homes may incur major damage or removal of roof decking and gable ends. Many trees will be snapped or uprooted, blocking numerous roads. Electricity and water will be unavailable for several days to weeks after the storm passes. 4 130–156 mph
Catastrophic damage: Well-built framed homes can sustain severe damage with loss of most of the roof structure and/or some exterior walls. Most trees will be snapped or uprooted and power poles downed. Fallen trees and power poles will isolate residential areas.

Power outages will last weeks to possibly months. Most of the area will be uninhabitable for weeks or months.
5 157 mph or
higher
Catastrophic damage: A high percentage of framed homes will be destroyed, with total roof failure and wall collapse. Fallen trees and power poles will isolate residential areas. Power outages will last for weeks to possibly months. Most of the area will be uninhabitable for weeks or
Source: National Weather Service, Saffir-Simpson Hurricane Wind Scale, https://www.nhc.noaa.gov/aboutsshws.php, accessed June 14, 2024.

Extreme Heat
The Heat Index, which measures the “apparent temperature” when considering both air temperature and humidity, is used by the NWS to identify extreme heat days. Extreme heat is particularly dangerous when occurring for a prolonged period (heat waves). Figure 4-10, Heat Index, shows the likelihood of heat disorder with prolonged exposure or strenuous activity associated with various temperatures and relative humidity. As described above, the NWS indicates alert procedures when the Heat Index is expected to exceed 105°F (depending on local climate). An extreme heat event would occur throughout the City.

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FIGURE 4-10: HEAT INDEX
Source: National Weather Service, NWS Heat Index, https://www.weather.gov/images/safety/heatindexchart-650.jpg, accessed June 14, 2024.

Power Outage
High Fire Risk Areas are areas with circuits within California Public Utilities Commission’s (CPUC) Tier 2 (elevated risk) and Tier 3 (extreme risk) Fire Threat Areas. The CPUC Fire-Threat Map was developed with input from the U.S. Forest Service, California Department of Forestry and Fire Protection, and the State’s investor-owned utilities, including SCE.

SCE uses their own thresholds prior to initiating a PSPS event. When evaluating weather and environmental conditions, SCE considers a variety of factors which include but are not limited to:
 National Weather Service Red Flag Warnings
 SCE meteorological assessments
 SCE Fire Potential Index
 SCE Fire Scientist assessments
 Real-time situational awareness information
 SCE Fire Management/Office of Emergency Management input  Concerns from local or State fire authorities
 Mandatory or voluntary evacuation orders in place
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 Expected impact of de-energizing circuits on essential services (including public safety agencies, water pumps, traffic controls, etc.)
 Other operational considerations to minimize wildfire ignitions Previous Occurrences
Heavy Rains
The rainy season in Glendora traditionally occurs between November into early May; although severe rains have occurred during other times of the year when weather conditions permit. Refer to the Flood Hazard Profile for a summary of specific regional storms that caused heavy rains in the City.

Santa Ana Winds
Santa Ana winds occur annually between September to May in the City of Glendora. These events have caused tree limbs to fall and debris to scatter, at times resulting in blocked roadways and downed powerlines. Significant Santa Ana wind events in Glendora’s recent history include an event in December 2011, where wind gusts of up to 80 miles per hour caused trees to fall and damage to power lines. As many as 230,000 were reported without power in the area and the City declared a state of emergency due to the severe winds, which caused an estimated $300,000 in damage.41 Since then, there have been many records of high winds. Most incidents of high wind in the City of Glendora are the result of either the Santa Ana winds or La Niña/El Niño wind conditions.

Extreme Heat
Based on Cal Adapt’s observed historical information (1961 through 2004), the City experiences four extreme heat days per year on average. 42 Over the past 20 years (2003-2023), the Santa Fe Dam monitoring station in Irwindale (located approximately 3.5 miles west of the City) has experienced an extreme heat event (101°F or higher) every year. 43 During this period, the maximum temperature during extreme heat events reached an average of 104.5°F. The southern California region experienced one of the most severe heatwaves during June 2012. During a seven-day period from June 14th to 20th, 2012, maximum daily temperatures stayed above 110°F. More recently, in 2022, California experienced a record-breaking severe heatwave. From September 1st through September 9th, 2022, temperature records for September were shattered across the western portion of the United States, including the San Gabriel Valley, where temperatures reached 111°F.
41 Lodevico-To'o, Hazel, Glendora City Manager Estimates $300,000 in Wind Damages, http://glendora.patch.com/articles/glendora-citymanager-estimates-300-000-in-wind-damages, published December 7, 2011, accessed June 14, 2024. 42 Cal-Adapt, Extreme Heat Days & Warm Nights, https://cal-adapt.org/tools/extreme-heat/, accessed June 13, 2024. 43 National Oceanic and Atmospheric Administration, Climate Data Online Search: Santa Fe Dam California, CA US, https://www.ncei.noaa.gov/cdo-web/datasets/GHCND/stations/GHCND:USR0000CSFD/detail, accessed June 18, 2024.

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Power Outage
Power outages due to severe weather events have affected parts of the City. Recent power outages include an event in January 2022 due to downed trees from Santa Ana winds;44 and an event in December 2021, where hundreds of homes lost power due to high winds and storm conditions.
45 Recent PSPS events include a November 2023 warning for the City of Glendora and surrounding area, as a precaution because of dry conditions and strong winds that could damage power lines and potential spark wildfires. 46 Advance notice was provided to SCE customers advising that power could be off for the whole period; turned off more than once; may not begin exactly at the announced plan outage started time; and conditions may require the planned outage to be postponed. More recently, PSPS warnings and power outages affecting some areas occurred in January 2025 due to high winds and fire conditions associated with the Eaton Fire.

Probability of Future Occurrences
Heavy Rains
El Niño and La Niña are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every 3-7 years on average.47 Together, they are called El Niño-Southern Oscillation (ENSO). The ENSO pattern in the tropical Pacific can be in one of three states: El Niño, Neutral, or La Niña. El Niño (the warm phase) and La Niña (the cool phase) lead to significant differences from the average ocean temperatures, winds, surface pressure, and rainfall across parts of the tropical Pacific. Neutral indicates that conditions are near their longterm average.

According to the National Weather Service, ENSO conditions have returned to neutral after experiencing El Niño conditions from winter to spring 2023-24; however, La Niña conditions are projected to develop during July to September (65% chance) and persist into the Northern Hemisphere during winter 2024-25 (85% chance).
48 Typically, El Niño is associated with warm,
wet winters in southern California, while La Niña is associated with cooler and drier conditions.

As such, the southern California area could experience a rapid swing from heavy precipitation to dryness. However, due to the cyclical nature of these climate patterns, and based on previous occurrences and weather trends in southern California, it is anticipated that heavy rains will continue to occur in the City. The probability of future occurrences is considered highly likely. 44 City of Glendora, City Updates: SCE Power Outage Map Link & Phone Number, https://www.cityofglendora.org/Home/Components/News/News/6270/23?npage=14, accessed June 19, 2024. 45 Fernandes, S. and Hernández, C., LA Is Drenched. Here's How The Storm Is Impacting The Area, https://laist.com/news/climateenvironment/los-angeles-storm-what-you-need-to-know, accessed June 19, 2024. 46 McMillan, R., SoCal Edison warns of possible power shutoffs as powerful Santa Ana winds increase fire threat, https://abc7.com/wind-powershutoffs-socal-edison-fire/14029054/, accessed June 19, 2024. 47 National Oceanic and Atmospheric Administration, El Niño and La Niña: Frequently asked questions, https://www.climate.gov/newsfeatures/understanding-climate/el-ni%C3%B1o-and-la-ni%C3%B1a-frequently-askedquestions#:~:text=El%20Ni%C3%B1o%20and%20La%20Ni%C3%B1a%20are%20opposite%20phases%20of%20a,for%20El%20Ni%C3%B1o %2DSouthern%20Oscillation, accessed June 19, 2024. 48 National Oceanic and Atmospheric Administration, El Niño/Southern Oscillation (ENSO) Diagnostic Discussion, https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml, published June 13, 2024, accessed June 19, 2024.

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Santa Ana Winds
High winds, or Santa Ana wind events for purposes of this LHMP, have historically occurred annually within southern California and the City of Glendora. According to the
National Weather Service, these winds are most common
during the cooler months of the year, occurring from
September to May. Due to the topography of the area,
weather patterns, and annual occurrence, there is no
indication that these events will not continue to occur in the future. Thus, due to their 100 percent annual occurrence, it is highly likely that high winds related to Santa Ana wind events will continue to occur in the City.

Extreme Heat
Extreme heat events have historically occurred within
southern California and the City. According to the National Weather Service, California has been experiencing more
frequent and severe heat waves. Cal-Adapt Extreme Heat
Days & Warm Nights tool indicates that for most areas of California, the climate models project a significant rise in the number of days exceeding what is now considered
extremely hot for the given area. For Glendora, baseline data (1961 through 1990), shows the City experiences four extreme heat days per year on average, which is projected to increase to increase to 18 days per year on average by mid-century (2035 through 2064).
49 Thus, based on the historical occurrence of four extreme heat days per year and projected increase in future occurrences of 18 days per year, the probability that extreme heat events will continue to occur in the City is highly likely.

Power Outage
Power outage and/or PSPS events are typically associated with heavy rains, Santa Ana winds, and extreme heat. These associated events are highly likely to continue to occur in the City. Thus, based on previous occurrences and the probability of future heavy rains, Santa Ana winds, and extreme heat, power outage is highly likely to continue to occur in the City.

Climate Change Considerations
Climate change has direct effects on heavy rain events. According to research conducted by UCLA, California will experience extremely wet and extremely dry seasons by the end of the century. Climate scientists predict that “over the next 40 years, the State will be 300 to 400 percent more likely to have a prolonged storm sequence as severe as the one that caused the legendary 49 Cal-Adapt, Extreme Heat Days & Warm Nights, https://cal-adapt.org/tools/extreme-heat/, accessed June 13, 2024.

Source: LADWP, LADWP Crews Prepared as Heavy
Rain and Wind Storm Forecasted, Reminds Public to
Stay Away from Downed Power Lines,
https://www.ladwpnews.com/ladwp-crews-preparedas-heavy-rain-and-wind-storm-forecasted-remindspublic-to-stay-away-from-downed-power-lines/ accessed November 21, 2024.

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California flood more than 150 years ago.”50 The Fourth Climate Change Assessment indicates the intensity of heavy precipitation events is increasing and identifies a medium-high confidence for future change. While the annual rainfall averages may remain constant, the wet season may be narrower, and precipitation is expected to fall in fewer, more extreme events.

According to the California Adaptation Planning Guide, local heat waves are likely to occur much more frequently. Climate models project a significant rise in the number of days exceeding what is normally considered extremely hot for Glendora. The number of heat waves is very likely to increase because of climate change, reflecting the global trend. According to Cal-Adapt, the number of extreme heat days in Glendora, defined as a day when the high temperature is at least 100.2°F, is expected to rise from a historical annual average of four days per year to 18 days per year by the middle of the century (2035 through 2064), and to an average of 24 days per year by the end of the century (2070 through 2099).51 The number of warm nights in Glendora is also expected to increase, which is defined as temperatures above 68.6°F. Climate change is expected to increase the number of warm nights from a historical annual average of four nights per year to 35 warm nights per year by the middle of the century (2035 through 2064) and 49 warm nights per year by the end of the century (2070 through 2099).

SCE reports that increased power outages are directly related to climate change, and states on their website that PSPS will become “the new normal during high fire/wind events.” PSPS will become increasingly required to mitigate fire risk as increased severity and duration of extreme weather events occur.

Additionally, climate change may result in storm events, Santa Ana winds, and heat waves occurring outside of traditional seasons of the year. This could increase secondary effects, such as flooding, erosion, or wildfire events.

WILDFIRE
Description
A wildfire is defined as an unplanned and unwanted wildland fire, including unauthorized humancaused fires, escaped wildland fire use events, escaped prescribed fire projects, and all other wildland fire where the object is to extinguish the fire. Wildfire is a natural part of the southern California ecosystem, helping to clear brush and debris, and is a necessary part of the various species’ life cycles. Wildfires can be sparked by lightning, accidents, or arson.

Human activity has changed the buffer zone between urbanized and undeveloped areas, known as the wildland-urban interface, where naturally fire-prone landscapes abut developed neighborhoods. The natural setting of a wildland-urban interface can make these areas highly 50 Colgan, D. (UCLA), Study forecasts a severe climate future for California, April 2018, https://newsroom.ucla.edu/releases/california-extremeclimate-future-ucla-study, accessed June 10, 2024. 51 Cal-Adapt, Extreme Heat Days & Warm Nights, https://cal-adapt.org/tools/extreme-heat/, accessed June 13, 2024.

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desirable places to live, and many of these areas in California are now developed. This development has brought more people into wildfire-prone areas. The availability of fuel and increasing encroachment into the wildland-urban interface have made wildfires a common and dangerous hazard in California. Certain development patterns pose more difficult fire problems.

These include multi-story, wood frame, high-density apartment developments; multi-story research developments; large continuous developed areas with combustible roofing materials; and facilities that use and/or store hazardous materials. Features of structural conditions that affect fire control include the type and use of structure, area of building, number of stories, roof covering, and exposures to the building.

Location and Extent
CAL FIRE prepares wildfire hazard severity maps including mapping areas of significant fire hazards based on fuels, terrain, weather, and other relevant factors. These zones, referred to as Fire Hazard Severity Zones (FHSZ), define the application of various mitigation strategies and influence how people construct buildings and protect property to reduce the risk associated with wildland fires. While FHSZ do not predict when or where a wildfire will occur, they do identify areas where wildfire hazards could be more severe and therefore are of greater concern. Zones are designated on varying degrees from moderate, high, and very high. A large portion of land within the City is open space and includes rugged topography with highly flammable chaparral vegetation, making wildland fires a significant risk to the community and within the City’s SOI.

Very High Fire Hazard Severity Zones (VHFHSZs) are in the northern and eastern foothills of the City; refer to Figure 4-11, Fire Hazard Severity Zones. Additionally, FHSZ are not limited to the City of Glendora. Land designed as VHFSZ is also located within the cities of Azusa and San Dimas, immediately west and east-southeast of Glendora, respectively. The Angeles National Forest is located to the north of the City and contains land designated as VHFSZ within a State Responsibility Area and land within a Federal Responsibility Area.

Fire protection challenges within Glendora occur where development is located within and directly adjacent to wildland-urban interface areas. As the number of structural features increase, so does the risk of incidence of fire. Wildfires are not measured on a specific scale and are usually classified by size or impact. The size and severity of any fire depends on the availability of fuel, weather conditions, and topography, although wildfires in the wildland-urban interface do not need to be identified as large to be damaging. Due to the location of development within and adjacent to Very High Fire Hazard Severity Zones, there is the potential for a wildfire to spread quickly and through a large portion of the City, depending on the conditions and nature of the fire.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
SCRRA
SCRRA
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
Fire Hazard Severity Zones in
Local Responsibility Areas
Very High
Fire Hazard Severity Zones in
State Responsibility Areas
Moderate*
High*
Very High
Figure 4-11. Fire Hazard
Severity Zones

CITY OF GLENDORA, CALIFORNIA
\
0 ½ 1
Miles
Sources: CalFire 4-1-2024; Los Angeles County GIS. Map date: December 12, 2024. * there are no lands with this classification
within the mapped extent
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Previous Occurrences
Fire season in southern California traditionally occurs between May and September. However, it should be noted that Glendora has experienced some of its most devastating fires during the fall (outside of the traditional fire season), including the Colby fire, as described below.

Major Wildfires in Los Angeles County History
Los Angeles County has experienced a number of major wildfires in the past, including the 1919 Ravenna and San Gabriel fires which claimed a combined 115,000 acres, and the 1970 WrightClampitt-Agua Dulce Fire which claimed approximately 135,000 acres. 52 Since 2005, there have
been over 110 incidents burning 10 acres or more in Los Angeles County.53 Table 4-13, Major Wildfires in Recent Los Angeles County History, identifies the most significant historical fires in Los Angeles County dating back to 2004 in terms of the amount of acreage claimed.

TABLE 4-13: MAJOR WILDFIRES IN RECENT LOS ANGELES COUNTY HISTORY Name Year Acres Claimed
Station Fire 2009 160,577
Bobcat Fire 2020 115,796
Woolsey Fire 2018 96,949
Ranch Fire 2007 58,401
Bridge Fire 2024 56,030
Buckweed (Agua Dulce) Fire 2007 38,000
Lake Fire 2020 31,089
Powerhouse Fire 2013 30,274
Topanga Fire 2005 24,175
Creek Fire 2017 15,619
Sesnon Fire 2008 14,703
Crown Fire 2010 13,918
Sayre Fire 2008 11,262
Source: California Department of Forestry and Fire Protection, Incidents, https://www.fire.ca.gov/Incidents, accessed June 13, 2024; County of Los Angeles Fire Department, Bobcat Fire Status, https://fire.lacounty.gov/bobcat-fire-status/, accessed June 13, 2024.

Note: For purposes of this LHMP, major wildfires are defined as burning more than 10,000 acres in total.

Significant Historical Wildfires Near Glendora
Some of the most significant fires occurring in the vicinity of Glendora area are described below. 2009 Station Fire. The Station Fire is the 10th largest wildfire in California history, burning 160,577 acres and killing two firefighters once it began in late August 2009. The fire started in the Angeles National Forest near the U.S. Forest Service ranger station on the Angeles Crest Highway (SR 2). The blaze threatened 12,000 structures in the National Forest and the nearby communities of La Cañada Flintridge, Glendale, Acton, La Crescenta, Littlerock, Pasadena, and Altadena, as well as the Sunland and Tujunga neighborhoods of Los Angeles. The fire was predicted to burn for months and travel miles to the City of Azusa adjacent to Glendora. The 52 Los Angeles County Fire Museum, Timeline of Significant Dates, https://www.lacountyfiremuseum.com/lacofd-timeline/, accessed June 13, 2024.
53 California Department of Forestry and Fire Protection, Incidents, Glendora Local Hazard Mitigation Plan
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Station Fire burned on the slopes of Mount Wilson, threatening numerous television, radio, and cellular antennas on the summit, as well as the Mount Wilson Observatory, which includes several historically significant telescopes and astronomical facilities operated by UCLA, USC, UC Berkeley, and Georgia State University. In October 2009, the fire extinguished due to a fall rainstorm.
2014 Colby Fire. The Colby Fire was a wildfire in the Angeles National Forest. It was ignited along the Colby Truck Trail in the San Gabriel Mountains in northern Los Angeles County. The fire started on January 16, 2014, caused by an illegal campfire that blew out of control. January fires are unusual in southern California, but there was little rainfall in the area leading up to the fire, which led to a “red flag” fire danger situation. Warm temperatures, low humidity, and an excess of dry brush in the foothills around Glendora (which had not burned significantly since the 1960s) encouraged the growth of the fire. By January 26, the Colby Fire was contained but had burned 1,992 acres. The fire, which was fanned by strong Santa Ana winds, destroyed five homes, injured one person, and forced the evacuation of 3,600 people at its peak. 2016 San Gabriel Complex Fire. The San Gabriel Complex Fire ignited the morning of June 20, 2016. The Complex Fire consisted of two fires: the Reservoir Fire and the Fish Fire. Both fires originated northeast of the city limits. The cause of the Reservoir Fire was due to a vehicle crash, while the cause of the Fish Fire is still under investigation. The fires burned fuel that was between seven and 10 years old with six- to eight-foot-tall chaparral and large grass crops. At the height of the fire, 1,376 homes were evacuated. The American Red Cross established an evacuation center and 1,460 staff from multiple local, state, and federal agencies worked to protect property and suppress the fire. Road closures were in place and law enforcement patrolled for security while firefighters worked through the night to contain the fire. Although the San Gabriel Complex Fire threatened homes in the City, no property damage was reported. 2020 Bobcat Fire. The Bobcat Fire started on September 6, 2020. By December 18, it was fully contained and had burned 115,796 acres in the central San Gabriel Mountains in the Angeles National Forest. It is one of the largest fires on record in Los Angeles County. The fire triggered mandatory evacuation orders in parts of Arcadia and Camp Williams. Forest Service investigators determined the cause of the fire was a power line conductor igniting overhead trees. The fire initially spread southward prompting evacuation orders for residents in Sierra Madre, Monrovia, Bradbury, and Duarte, along with evacuation warnings for those in Arcadia, Pasadena, and Altadena. The fire then grew westward and threatened the Mount Wilson Observatory, approaching within 500 feet of the observatory as firefighters worked to protect the structure. By September 17, the fire rapidly expanded to the north into Pleasant View Ridge Wilderness due to moderate coastal winds, leading to mandatory evacuations in Antelope Valley as the fire approached Juniper Hills. Containment difficulties were exacerbated by very dry vegetation and rugged topography that made it difficult to access. An estimated 6,000 structures were threatened and there were six injuries. The fire destroyed 27 residences and damaged 28 others. It also destroyed 83 structures and damaged 19 others.

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2024 Bridge Fire. The Bridge Fire began on September 8, 2024 in the Angeles National Forest near Glendora. The fire began after a recent heat wave and fueled by dry conditions and high winds, spread to over 56,030 acres in Los Angeles and San Bernardino counties. Evacuation orders were issued in the Angeles National Forest area, including Wrightwood and Mount Baldy, and evacuation warnings were issued for the Foothill Communities, including portions of Claremont, La Verne, and San Dimas. The fire destroyed 17 structures and damaged 81 others.

There were eight confirmed fire personnel and civilian injuries.

Source: Margolis, J. and Ujiiye, T., Bridge Fire explodes to 47K acres; more than 30 homes destroyed, https://laist.com/news/climateenvironment/bridge-fire-angeles-national-forest-evacuations, accessed November 21, 2024. 2025 Eaton Fire. The Eaton Fire began on the evening of January 7, 2025 in Eaton Canyon in the San Gabriel Mountains, near Altadena. The fire was one of several major concurrent fires in the County being driven by dry conditions and extremely powerful Santa Ana winds, including the Palisades Fire and Hughes Fire. By February 20, 2025, the fire was completely contained and had burned 14,021 acres. The Eaton Fire is one of the most destructive wildfires in California history, destroying an estimated 9,414 structures, damaging 1,074 others, and resulting in 17 confirmed fatalities and nine injuries.

Probability of Future Occurrences
Wildfires have a high probability of occurring due to Glendora’s location at the base of the San Gabriel Mountains, which creates a wildland-urban interface that makes the City particularly susceptible to wildfire. Los Angeles County is continually exposed to Santa Ana winds during the fall season; however, these winds can occur at other times of the year as well. Additionally, as with the recent Eaton, Bobcat, San Gabriel Complex, Colby, and Bridge fires, it is highly likely that Glendora Local Hazard Mitigation Plan
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fires of regional significance will occur in the San Gabriel Mountains that could impact the City of Glendora. The wildland-urban interface is likely to experience wildfires in future years.

Climate Change Considerations
Several of the largest California wildfires have occurred in the past decade, including the August Complex Fire, Dixie Fire, and Mendocino Complex Fire.
54 During 2018, the Camp Fire became
the deadliest wildfire in California history, killing 85 civilians and burning over 153,000 acres in Butte County.55 Southern California experienced several severe fires in recent history, including the Eaton Fire, Palisades Fire, Bobcat Fire, Woolsey Fire, Lake Fire, and Creek Fire.

Climate change is expected to cause an increase in temperatures, as well as more frequent and intense drought conditions. The severity of a wildfire is dependent on the amount of oxygen, heat, wind, relative humidity, and fuel. Excessive heat and low humidity during the summer and fall months are likely to occur. It is possible that higher temperatures could cause local native chaparral and scrub ecosystems to change to grasslands. This would increase dry plant matter, which could cause wildfires to move more quickly or spread into developed areas of Glendora.

It is well documented that regional wildfires will likely become an increased threat, which could have secondary consequences for the City. Fires located in different parts of Los Angeles, Orange, Riverside, or San Bernardino counties can negatively impact air quality in the City.

Wildfires release smoke, ash, and other particulate matter that substantially degrade air quality (including fine particulate matter, PM2.5). PM2.5 is particularly damaging to human health since particulate matter of this size can deeply penetrate lung tissue and affect a person’s respiratory and cardiovascular systems. While poor air quality affects everyone, people with weakened immune systems or preexisting conditions, children, seniors, and people who spend a disproportionate amount of time outside are at an increased risk of wildfire smoke. The increase in wildfire frequency and size can contribute to periods of unhealthy to hazardous air quality, which leads to respiratory health impacts and worsens health impacts in persons with preexisting health conditions.
54 California Department of Forestry and Fire Protection, Top 20 Largest California Wildfires, October 2022. 55 California Department of Forestry and Fire Protection, Camp Fire, https://www.fire.ca.gov/incidents/2018/11/8/camp-fire/, accessed June 13, 2024.

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4.3 VULNERABILITY/RISK ASSESSMENT
Vulnerability refers to a description of which assets, including structures, systems, populations, and other assets as defined by the community, within locations identified to be hazard-prone, are at risk from the effects of the identified hazards. A vulnerability analysis predicts the extent of damage to the built environment that may result from a hazard event of a given intensity in a specific area.

HISTORY OF DISASTERS AND OTHER DECLARATIONS
Federally declared disasters and other declarations affecting Los Angeles County from 2014 to 2025 are listed below in Table 4-14, Los Angeles County FEMA Disaster Declarations (2014- 2025). As shown, the greatest threats to the County and City include fire, severe weather, flooding, and seismic and geologic hazards such as landslide and mudslide.

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TABLE 4-14: LOS ANGELES COUNTY FEMA DISASTER DECLARATIONS (2014-2025) Disaster
Number Description Declaration Date/Incident Period Assistance Provided 5051 Fire
(California Colby Fire)
01-16-2014
(01-16-2014 to 01-22-2014) N/A
5124 Fire
(California Old Fire)
06-05-2016
(06-04-2016 to 06-10-2016) Public Assistance
5129 Fire
(California Fish Fire)
06-21-2016
(06-20-2016 to 06-30-2016) Public Assistance
5132 Fire
(California Sage Fire)
07-09-2016
(07-09-2016 to 07-14-2016) Public Assistance
5135 Fire
(California Sand Fire)
07-23-2016
(07-22-2016 to 08-01-2016) Public Assistance
4305
Flood
(Severe Winter Storms,
Flooding, and Mudslides in
California)
03-16-2017
(01-18-2017 to 01-23-2017) Public Assistance, Risk
Mitigation Assistance
5201 Fire
(California la Tuna Fire)
09-02-2017
(09-01-202017 to 09-10-
2017)
Public Assistance
5225 Fire
(California Creek Fire)
12-05-2017
(12-05-2017 to 12-14-2017) Public Assistance
5226 Fire
(California Rye Fire)
12-05-2017
(12-05-2017 to 12-14-2017) Public Assistance
5227 Fire
(California Skirball Fire)
12-06-2017
(12-06-2017 to 12-15-2017) Public Assistance
3396 Fire
(California Wildfires)
12-08-2017
(12-04-2017 to 12-29-2017) N/A
4353
Fire
(California Wildfires,
Flooding, Mudflows, and
Debris Flows)
01-02-2018
(12-04-2017 to 01-31-2018) Individual Assistance, Public Assistance, Hazard Mitigation
Assistance
3409 Fire
(California Wildfires)
11-09-2018
(11-08-2018 to 11-25-2018) N/A
5280 Fire
(California Woolsey Fire)
11-09-2018
(11-08-2018) N/A
4407 Fire
(California Wildfires)
11-12-2018
(11-08-2018 to 11-25-2018)
Individual Assistance, Public
Assistance, Hazard Mitigation
Assistance
5293 Fire
(California Saddleridge Fire)
10-11-2019
(10-10-2019)
Public Assistance, Hazard
Mitigation Assistance
5296 Fire
(California Tick Fire)
10-24-2019
(10-24-2019) Public Assistance
5297 Fire
(California Getty Fire)
10-28-2019
(10-28-2019) Public Assistance
3428 Biological
(California Covid-19)
03-13-2020
(01-20-2020 to 05-11-2023) Public Assistance
4482
Biological
(California Covid-19
Pandemic)
03-22-2020
(01-20-2020 to 05-11-2023)
Individual Assistance, Public
Assistance, Hazard Mitigation
Assistance
5374 Fire
(California Bobcat Fire)
09-13-2020
(09-13-2020) N/A
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Disaster
Number Description Declaration Date/Incident Period Assistance Provided 4569 Fire
(California Wildfires)
10-16-2020
(09-04-2020 to 11-17-2020)
Individual Assistance, Public
Assistance, Hazard Mitigation
Assistance
3591
Flood
(California Severe Winter
Storms, Flooding, and
Mudslides)
01-09-2023
(01-08-2023 to 01-31-2023) N/A
4683
Flood
(California Severe Winter
Storms, Flooding,
Landslides, and Mudslides)
01-14-2023
(12-27-2022 to 01-31 2023) Individual Assistance, Public Assistance, Hazard Mitigation
Assistance
3592
Flood
(California Severe Winter
Storms, Flooding,
Landslides, and Mudslides)
03-10-2023
(03-09-2023 to 07-10-2023) N/A
4699
Severe Storm
(California Severe Winter
Storms, Straight-line Winds,
Flooding, Landslides, and
Mudslides)
04-03-2023
(02-23-2023 to 07-10-2023) Individual Assistance, Public Assistance, Hazard Mitigation
Assistance
4769
Severe Storm
(California Severe Winter
Storms, Tornadoes,
Flooding, Landslides, and
Mudslides)
04-13-2024
(01-31-2024 to 02-09-2024)
Public Assistance
5537 Fire
(California Bridge Fire)
09-11-2024
(09-08-2024 to ongoing) Public Assistance
5548 Fire
(California Franklin Fire)
12-10-2024
(12-9-2024 to ongoing) Public Assistance
5549 Fire
(California Palisades Fire)
1-7-2025
(1-7-2025 to ongoing) Public Assistance
5550 Fire
(California Eaton Fire)
1-7-2025
(1-8-2025 to ongoing) Public Assistance
5551 Fire
(California Hurst Fire)
1-7-2025
(1-8-2025 to ongoing) Public Assistance
4856 California Wildfires and
Straight-line Winds
1-7-2025
(1-8-2025 to ongoing)
Individual Assistance, Public
Assistance, Hazard Mitigation
Assistance
Source: Federal Emergency Management Agency, Disasters and Other Declarations, https://www.fema.gov/disaster/declarations, accessed January 24, 2025.

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State-proclaimed disasters affecting Los Angeles County from 2014 to 2025 are listed in Table 4- 15, California State Disaster Declarations for Los Angeles County (2014-2025). State-proclaimed disasters affecting the County and City include severe weather and wildfire.

TABLE 4-15: CALIFORNIA STATE DISASTER DECLARATIONS FOR LOS ANGELES COUNTY (2014-2025) Disaster
Code Description Date of Disaster
65 Severe Rainstorms July 2015
68 Rainstorms October 2015
71 Sand Fire July 2016
77 January Winter Storms January 2017

77.1 February Winter Storms February 2017
86 La Tuna Fires September 2017
93 Creek & Rye Fires December 2017
108 Hill & Woolsey Fires November 2018
109 Atmospheric River Storm System January and February 2019 112 Eagle, Reche, Saddleridge, Sandalwood, and
Wolf Fires
October 2019
113 Kincade and Tick Fires October 2019
116 CA wildfires September 2020
127 December Winter Storms December 2021
135 Tropical Storm Kay September 2022
138 Route Fire (Declared November 2022) August 2022
140 Severe Winter Storms December 2022 and January 2023 141 Severe Winter Storms February 2023 and March 2023
142 Tropical Storm Hilary August 2023
146 Severe Winter Storms February 2024
147 Storms March 2024
153 Bridge & Airport Fires September 2024
157 Fires & Windstorm January 2025
Source: California State Franchise Tax Board, List of California Disasters, https://www.ftb.ca.gov/file/business/deductions/disaster-codes.html, accessed January 24, 2025.

METHODOLOGY
For each of the hazards profiled in the previous section, a vulnerability/risk assessment is provided in this section. It should be noted that the actual losses will depend on the type, location, magnitude, and extent of the hazard event.

The vulnerability/risk examines three aspects of each hazard: the physical threat to critical facilities, facilities of concern, and residential and non-residential structures; the social threat to vulnerable populations, including residents and visitors to the City; and the threat to any other assets that may be affected.

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This section relies primarily on the following data sources:
 U.S. Census [2017-2021 American Community Survey (ACS) 5-year estimates]  Center for Disease Control and Prevention (CDC)/ Agency for Toxic Substances and Disease Registry (ATSDR) Social Vulnerability Index (SVI)
 California Environmental Protection Agency (CalEPA) SB 535 Disadvantaged Communities  FEMA’s National Risk Index
Census data and associated analysis/mapping conducted as part of the City’s Housing Element Update were reviewed and compared to the hazards and associated mapping provided within this LHMP to provide an understanding of socially vulnerable populations that may potentially reside within an area of the City subject to hazards. This information was supplemented by the CDC/ATSDR SVI, which uses U.S. census data to determine the social vulnerability of each census tract and ranks each tract on 16 variables, in order to identify communities that may need support before, during, or after disasters. These variables are grouped into four themes that cover major areas of social vulnerability: socioeconomic status (e.g., income below 150% of poverty level, unemployed, no health insurance), household characteristics (e.g., 65 years or older, aged 17 years or younger, single parent households, English language proficiency), racial and ethnic minority status, and housing type and transportation (e.g., multi-unit structures, mobile homes, crowding, no vehicle).

FEMA’s National Risk Index was reviewed in regard to the risks associated with the natural hazards with the potential to affect the City and County. FEMA’s National Risk Index leverages available data for natural hazard and community risk factors to develop a baseline risk measurement at the county and census tract level. Risk refers to the potential for negative impacts as a result of a natural hazard. FEMA’s National Risk Index does not include human-induced hazards. For example, a flood resulting from changes in river flows is a natural hazard, whereas flooding due to a dam failure is considered a manmade hazard, and therefore excluded from the National Risk Index.

In determining risk, FEMA’s National Risk Index considers three components: a natural hazards component (expected annual loss), a consequence enhancing component (social vulnerability), and a consequence reduction component (community resilience). Expected Annual Loss represents the average economic loss in dollars resulting from natural hazards each year. It is calculated for each hazard type and quantifies loss for relevant consequence types: buildings, people, and agriculture. Social vulnerability is the susceptibility of social groups to the adverse impacts of natural hazards, including disproportionate death, injury, loss, or disruption of livelihood. Community resilience is the ability of a community to prepare for anticipated natural hazards, adapt to changing conditions, and withstand and recover rapidly from disruptions Glendora Local Hazard Mitigation Plan
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CRITICAL FACILITIES AND FACILITIES OF CONCERN
The LHMP Planning Team identified 61 critical facilities and facilities of concern for incorporation in the hazard vulnerability/risk analysis; refer to Table 4-16 and Figure 4-12, Glendora Critical Facilities and Facilities of Concern. Critical facilities and facilities of concern are owned, operated, and maintained by various agencies, not just the City. Critical facilities are buildings that are essential for the delivery of vital services or protection of a community. Critical facilities include emergency operation centers, healthcare facilities, police and fire stations, schools and power stations. These facilities support critical community lifelines that enable the continuous operation of critical business and government functions and are essential to human health and safety or economic security. Damage to these facilities caused by a hazard event has the potential to impair response and recovery and may lead to disruption of services. Facilities of concern are less vital to safety and well-being, but may assist in evacuations, serve as assembly points or temporary shelters, or provide a supportive role in preparing for and recovering from hazard events.

Where available, the LHMP Planning Team identified a facility’s potential loss value, comprised of replacement and contents for each facility. The data was provided by the City’s property insurance schedule and therefore, information for facilities not owned by the City are not shown (e.g. infrastructure, private buildings). In some instances, replacement cost information was not made available. If a facility is destroyed in a hazard event, the replacement and contents values indicate the cost to replace the entire facility and all of its contents. Typically, the cost to repair a damaged facility would be less than the replacement value. While the replacement and contents values are used throughout this plan to estimate potential losses, it is noted that the actual cost to recover from a hazard event will depend on the type and magnitude of the event.

The critical facilities were mapped in GIS and overlaid with mapped hazard areas (those hazards that have a specific geographic area) to determine which assets are located in each hazard area.

Hazard areas and critical facility overlays were conducted for dam inundation, flood, seismic ground shaking, landslide (specific to seismic conditions), liquefaction, and wildfires.

Due to the nature of the hazards and availability of information, hazard overlays were not prepared for drought, landslide/mudflow, and severe weather. These hazards are not geographically defined and have the potential to affect the entire community. There are no defined hazard areas for moisture-induced landslides and mudflows, although as discussed in the hazard profile, they typically occur along hillside areas and can result from conditions caused by other hazards, such as heavy rains following wildfires. For the purposes of this LHMP, it is assumed these hazards could potentially impact the entire community, including the critical facilities.

Replacement and contents values for the facilities in each hazard area are provided to estimate the potential losses based on the method described above. However, the likelihood that all facilities are completely damaged at the same time or that the entirety of a structure and its Glendora Local Hazard Mitigation Plan
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contents are damaged is extremely unlikely. Most impacts are anticipated to be isolated to certain locations based on the hazard.

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TABLE 4-16: GLENDORA CRITICAL FACILITIES AND FACILITIES OF CONCERN Map
ID Name Type Owner/ Responsible Agency Location Critical Facility Facility of
Concern
1 Glendora Police Facility /
City Transmitter Site Government City of Glendora 150 S Glendora Avenue X 2 Glendora City Hall Government City of Glendora 116 E Foothill Boulevard X 3 Glendora Library and
Cultural Center Government City of Glendora 140 S Glendora Avenue X 4 Frontier Telephone Center Communications Frontier 252 S Glendora Avenue X 5 Foothill Presbyterian
Hospital Medical Emanate Health 250 S Grand Avenue X
6 Foothill Medical Arts
Building Medical Privately Held 210 S Grand Avenue X
7 A Line (Gold Line)
Overcrossing
Transportation
Infrastructure
Los Angeles County
Metropolitan
Transportation
Authority
Grand Avenue / Foothill
Boulevard X
8 Citrus College School Citrus Community
College District 1000 W Foothill Boulevard X
9 St. Lucy’s Priory High
School School St. Lucy’s Priory 655 W Sierra Madre X
10 Sandburg Middle School School Glendora Unified
School District 819 W Bennett Avenue X
11 La Fetra Elementary School School Glendora Unified
School District 547 W Bennett Avenue X
12 LA County Fire Station
#151 Government Los Angeles County Fire Department
231 W Mountain View
Avenue
X
13 La Fetra Senior Center Community City of Glendora 333 E Foothill Boulevard X 14 City Transportation Center Government City of Glendora 410 E Dalton Avenue X 15 Glendora Youth Center Community City of Glendora 427 E Dalton Avenue X 16 American Legion Building Community City of Glendora 159 N Cullen Avenue X 17 Liberty House Community City of Glendora 181 N Cullen Avenue X 18 I-210 Overcrossing at
Glendora Ave
Transportation
Infrastructure Caltrans I-210/ Glendora Avenue X
19 LA Dept of Water and
Power High Voltage
Transmission Lines
Electrical
Infrastructure
Los Angeles
Department of Water
and Power
1000 S Glendora Avenue
west to Grand Avenue and
east to the South Hills
X
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Map
ID Name Type Owner/ Responsible Agency Location Critical Facility Facility of
Concern
20 Crowther Teen Center Community 241 W Dawson Avenue X 21 SCE Sub-Station Electrical
Infrastructure Grand Ave / Citrus Edge X
22 LA Dept of Water and
Power High Voltage
Transmission Lines
Electrical
Infrastructure
Los Angeles
Department of Water
and Power
1100 S Grand Avenue east
to Glendora Avenue and
west to Barranca Avenue
X
23 I-210 Overcrossing at
Grand Ave
Transportation
Infrastructure Caltrans I-210/ Grand Avenue X
24 Foothill Christian School #1 School Foothill Christian 242 W Baseline Road X 25 Foothill Christian School #2 School Foothill Christian 901 S Grand Avenue X 26 Whitcomb High School School Glendora Unified
School District 350 W Mauna Loa Avenue X
27 Stanton Elementary School School Glendora Unified
School District 725 S Vecino Avenue X
28 I-210 Overcrossing at
Barranca Ave
Transportation
Infrastructure Caltrans I-210/Barranca Avenue X
29 LA Dept of Water and
Power High Voltage
Transmission Lines
Electrical
Infrastructure
Los Angeles
Department of Water
and Power
1200 S Barranca Avenue
east to Grand Avenue
X
30 Washington Elementary
School School Charter Oak Unified School District 325 W Gladstone Avenue X 31 Covina Irrigating Company Water/Wastewater
Infrastructure
Covina Irrigating
Company 255 W Arrow Highway X
32 City of Glendora Water
Yard
Water/Wastewater
Infrastructure City of Glendora 1051 E Sierra Madre Avenue X 33 Goddard Middle School School Glendora Unified
School District 859 E Sierra Madre Avenue X
34 Cullen Elementary School School Glendora Unified
School District 440 N Live Oak Avenue X
35 Glendora USD Office /
Sellers Elementary School School Glendora Unified School District 500 N Loraine Avenue X 36 Hope Lutheran School School Hope Lutheran
Church 1041 E Foothill Boulevard X
37 Williams Educational
Center School Glendora Unified School District 301 S Loraine Avenue X Glendora Local Hazard Mitigation Plan
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Map
ID Name Type Owner/ Responsible Agency Location Critical Facility Facility of
Concern
38 A Line (Gold Line) /
Railroad Overcrossing
Transportation
Infrastructure
Los Angeles County
Metropolitan
Transportation
Authority
1400 E Route 66 X
39 Glendora Community
Service Yard Government City of Glendora 1626 E Compromise Line Road X 40 Glendora City Yard Government City of Glendora 440 S Loraine Avenue X 41 Glendora High School School Glendora Unified
School District 1600 E Foothill Boulevard X
42 LA County Fire Station #86 Government Los Angeles County Fire Department 520 S Amelia Avenue X
43 I-210 Overcrossing at Lone
Hill Ave
Transportation
Infrastructure Caltrans I-210/Lone Hill Avenue X
44 I-210 Overcrossing at
Railroad tracks
Transportation
Infrastructure Caltrans I-210/Railroad Tracks (west of Lone Hill Avenue) X 45 A Line (Gold Line)
Overcrossing at Lone Hill
Ave
Transportation
Infrastructure
Los Angeles County
Metropolitan
Transportation
Authority
Lone Hill Avenue/ Railroad
Tracks (south of Lone Hill
Avenue/ Auto Centre Drive)
X
46 LA Dept. of Water and
Power High Voltage
Transmission Lines
Electrical
Infrastructure
Los Angeles
Department of Water
and Power
900 S Lone Hill Avenue east
to Amelia Avenue and west
to Pompei Park
X
47 I-210/SR-57 Overcrossing
at Auto Centre Dr
Transportation
Infrastructure Caltrans I-210/SR-57 X
48 I-210 Overcrossing at
Amelia
Transportation
Infrastructure Caltrans I-210/Amelia Avenue X
49 Water Storage Facility Water/Wastewater
Infrastructure Cal Water Valley Center / Plymouth X
50 Willow Elementary School School Charter Oak Unified
School District 1427 S Willow Avenue X
51 I-210 Overcrossing at
Sunflower Ave
Transportation
Infrastructure Caltrans I-210/Sunflower Avenue X
52 Sunflower School School Charter Oak Unified
School District 1505 S Sunflower Avenue X
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Map
ID Name Type Owner/ Responsible Agency Location Critical Facility Facility of
Concern
53 LA County Fire Station #85 Government Los Angeles County Fire Department 650 E Gladstone Street X
54 I-210 Overcrossing at
Bonnie Cove
Transportation
Infrastructure Caltrans I-210/Bonnie Cove X
55 Angeles National Forest
Glendora Ranger Station Government U.S. Forest Service 110 N Wabash Avenue X 56 Big Dalton Dam
Los Angeles County
Department of Public
Works
2600 Big Dalton Canyon
Road X
57 Little Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Glendora Mountain Road/Big
Dalton Canyon Road X
58 Big Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Glendora Mountain Road/Big
Dalton Canyon Road X
59 Puddingstone Diversion* Dam
Los Angeles County
Department of Public
Works
N San Dimas Canyon
Road/Terrebonne Avenue X
60 Morgan Debris Basin Dam
Los Angeles County
Department of Public
Works
Morgan Ranch Road/Valiant
Street X
61 San Dimas* Dam
Los Angeles County
Department of Public
Works
9865 N San Dimas Canyon
Road X
Source: City of Glendora, 2024.

Note: * These critical facilities are located outside of the Glendora Planning Area, but have dam inundation areas affecting the City.

S Barranca Ave
E Baseline Rd
W Covina Blvd
S Valley Center Ave
S Loraine Ave
W Gladstone St
W Cienega Ave
E Covina Blvd
E Cienega Ave
Bonnie Cove Ave
W Baseline Rd
N Walnut Ave
E Leadora Ave
N Barranca Ave
E Gladstone St
N Glendora
N Valley Center Ave
Glendora
MountainRd
E Alosta Ave
E Sierra Madre Ave
S San Dimas Ave
S Lone Hill Ave
E Foothill Blvd
S Citrus Ave
E Foothill Blvd
Amelia Ave
E Baseline Rd
W Bonita Ave
W Baseline RdN Grand Ave N Grand Ave
W Route 66
W Foothill Blvd
N Glendora Ave
E Arrow Hwy
E Route 66
39 210
210
Arrow Hwy
57 E Cypress St Badillo St
SCRRA
SCRRA
1 3
2 5 4
6 8
10 11
9 12
14 1315
17 16
7 20 18 21
24 25
23 26
27 28
22 19
31 32
33 34
35 30
29 36
37 38
40 39
41 42
43 47
44 46
48 45
50 52
51 53
49 55
54 56
57 58
60 59
61 LEGEND
Critical Facility
Facility of Concern
City of Glendora
Sphere of Influence
Figure 4-12. Glendora Critical Facilities
and Facilities of Concern

CITY OF GLENDORA, CALIFORNIA
\
0 ½ 1
Miles
Sources: California Geological Survey Regulatory Maps Portal; Los Angeles County GIS. Map date: December 12, 2024.

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VULNERABLE POPULATIONS
Factors such as age, socioeconomic status, access to key services, physical and/or mental conditions, and other factors affect the ability of people to prepare for and respond to a hazard event. Even though some hazard events may impact all parts of Glendora with equal severity, different people may experience the impacts to a greater or lesser extent. For example, lowerincome households are less likely to have the financial resources to implement mitigation actions in their homes, and less likely to have the financial means to recover as a result of a hazard event.

As a result, certain groups are considered to be more vulnerable to specific hazards than other groups.

This assessment includes a social threat analysis that examines how hazard events are likely to impact different populations within Glendora and where these populations live in the City. This includes assessing whether the people in an area of an elevated hazard risk are more likely than the average person to be considered a vulnerable population. The following criteria are used to assess the threat to vulnerable populations:
 Disability status: Persons with disabilities often have reduced mobility and may experience difficulties living independently. As a result, they may rely on the assistance of others to prepare for and mitigate hazard conditions.
 Income levels: Lower-income households are less likely to have the financial resources to implement mitigation activities on their residences. They may also struggle with having the necessary time to find and access educational resources discussing hazard mitigation strategies. Furthermore, lower-income households are less likely to be able to move to safer areas that are less at risk of being impacted by a hazard.  Age: Seniors (individuals 65 years of age or older) are more likely to have reduced mobility, physical and/or mental disabilities, and lower-income levels, all of which may decrease their ability to prepare for and mitigate a hazard event. Similarly, individuals under 18 years of age may rely on the assistance of their parent(s) or guardian to prepare for and mitigate hazard conditions.
 Other variables: Other demographic and socioeconomic factors may adversely affect communities that encounter hazards. For instance, persons without access to a vehicle or non-English speakers may have greater difficulty during an evacuation event; persons without health insurance may have difficulties recovering from injuries sustained during a hazard event; and unsheltered persons are particularly vulnerable to severe weather events.

Social vulnerability refers to the potential negative effects on communities caused by external stresses on human health, including natural or human-caused hazards. Reducing social vulnerability can decrease both human suffering and economic loss. The CDC SVI uses 16 variables to help local officials identify communities that may need support before, during, or after disasters. These variables are grouped into four themes that cover major areas of social vulnerability: socioeconomic status (e.g., income below 150% of poverty level, unemployed, Glendora Local Hazard Mitigation Plan
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housing cost burden, no high school diploma, no health insurance), household characteristics (e.g., 65 years or older, aged 17 years or younger, civilian with a disability, single parent households, English language proficiency), racial and ethnic minority status, and housing type and transportation (e.g., multi-unit structures, mobile homes, crowding, no vehicle, group quarters). The CDC SVI uses Census data to determine the social vulnerability of every census tract. Each tract receives a separate ranking for each of the four themes, as well as an overall ranking. Maps of the four themes are shown in the figures below. The overall SVI map is shown in Figure 4-13; the socioeconomic SVI is shown in Figure 4-14; the household composition SVI is shown in Figure 4-15; the minority and language SVI is shown in Figure 4-16; and the housing and transportation SVI is shown in Figure 4-17.

Table 4-17, Social Vulnerability Index, shows the CDC’s SVI percentile ranking for each census tract in the City (Statewide comparison). The percentile ranking represents the proportion of tracts that are equal to or lower than a tract of interest in terms of social vulnerability. For example, a CDC SVI ranking of 0.85 signifies that 85% of tracts in the State are less vulnerable than the tract of interest and that 15% of tracts in the State are more vulnerable. Tracts with higher SVI ranking are more likely to contain vulnerable populations.

TABLE 4-17: SOCIAL VULNERABILITY INDEX
Census
Tract
Overall
SVI
Socioeconomic
Status
Household
Characteristics
Racial/Ethnic
Status
Housing Type &
Transportation
4004.02 0.3657 0.448 0.0556 0.3496 0.6819
4004.04 0.0242 0.0528 0.2652 0.1424 0.0253
4005.01 0.185 0.3341 0.1597 0.1016 0.211
4008.01 0.3225 0.1692 0.2198 0.4465 0.6698
4010.01 0.1153 0.1874 0.4831 0.3753 0.0264
4010.02 0.3606 0.3167 0.147 0.3557 0.6797
4011.01 0.6844 0.4295 0.8571 0.4855 0.8436
4011.02 0.6825 0.5007 0.4796 0.4476 0.9589
4012.01 0.1533 0.074 0.5982 0.4365 0.1072
4012.02 0.3915 0.4314 0.7635 0.4507 0.1352
4012.03 0.633 0.4291 0.7069 0.5438 0.8092
4039.01 0.4479 0.4469 0.6415 0.5092 0.284
4039.02 0.5372 0.2531 0.7436 0.554 0.7589
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

As shown, there are four census tracts in the City with an overall SVI that falls within the third quartile (0.5001 to 0.7500), which the CDC categorizes as having “Medium-High” level of vulnerability. These tracts are generally located in the central, south-central, and southwestern areas of the City, whereas the northern and eastern portions of the City contain lower overall SVI.

The census tracts with the highest overall SVI (that are thus more likely to contain vulnerable populations) include:

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 Tract 4011.01. This census tract is located in the south-central portion of the City, north of I210, east of Glendora Avenue/Cullen Avenue, west of Loraine Avenue, and south of Foothill Boulevard. This tract is predominantly composed of single-family residential uses, with higher density and multi-family residential, commercial, and light industrial uses located generally along Route 66 and Glendora Avenue. This tract also includes a large portion of the South Hills open space area. Notable residential uses that may contain vulnerable populations include Tropics Park, Western Skies, and Alosta mobile home parks. This tract also contains the Elwood Family Apartments, an affordable housing complex restricted to low-income families; and Heritage Oaks, an affordable housing complex restricted to low-income seniors.

The City of Glendora 2021-2029 Housing Element identifies this tract as one of the two census tracts in the City identified as being vulnerable to displacement.  Tract 4011.02. This census tract is located in the central portion of the City, north of Mauna Loa Avenue, south of Foothill Boulevard, east of Grand Avenue, and generally west of Cullen Avenue. This tract contains a mix of single- and multi-family uses, commercial, and civic uses.

Notable residential uses that may contain vulnerable populations include the Park Manor mobile home park and Joy’s Mobile Home Park, which is restricted to seniors. Other notable uses with vulnerable populations include Glendora Hospital, Foothill Presbyterian Hospital, and Glendora Canyon Transitional Care Unit. According to U.S. Census data (2017-2021 ACS), this census tract has the highest rate of overcrowding in the City, with 9.6 percent considered overcrowded and 4.9 percent considered severely overcrowded. The City of Glendora 2021-2029 Housing Element identifies this tract as one of the two census tracts in the City identified as being vulnerable to displacement.  Tract 4012.03. This census tract is located in the southern portion of the City, south of I-210, east of Glendora Avenue, and west of Sunflower Avenue. This tract is predominantly composed of single-family residential uses, with higher density and multi-family residential and commercial uses located generally along Arrow Highway. Notable residential uses that may contain vulnerable populations include the Glenair and Arrowhead mobile home parks.  Tract 4039.02. This census tract is located in the southwest portion of the City, generally south of Big Dalton Wash and I-210, and west of Glendora Avenue. This tract consists mostly of single-family residential uses, but also includes commercial and multi-family residential uses, located along Gladstone Street, Grand Avenue, and Arrow Highway. Notable residential uses that may contain vulnerable populations include the Rancho Glendora and Bonita Mobile Estates mobile home parks.

While other census tracts within the City had lower overall SVI scores than the four tracts identified above, vulnerable populations may still occur. For instance, persons over the age of 65 and persons with disabilities are located throughout the City. Areas that are less likely to have significant vulnerable populations are largely concentrated in the northern and northeastern portions of the City, generally located north of Foothill Boulevard. This area is predominantly made up of single-family residential uses and open space.

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Another indicator of vulnerable populations is the California Environmental Protection Agency (CalEPA) SB 535 Disadvantaged Communities map, which shows geographic areas containing designated disadvantaged communities for the purpose of SB 535. The designation is based in part on census tracts receiving the highest 25 percent of scores according to the Office of Environmental Health Hazard Assessment’s CalEnviroScreen tool, which identifies communities experiencing disproportionate amounts of pollution, environmental degradation, and socioeconomic and public health conditions. There are no disadvantaged communities in Glendora according to CalEPA’s SB 535 Disadvantaged Communities map.56 According to the 2024 Los Angeles County Continuum of Care Point-in-Time, the City has a population of 61 unsheltered people.57 The 2024 count shows a 32 percent decrease in persons experiencing homeless from 2022. It is assumed that the number of people experiencing homelessness in the City fluctuates and is likely to be higher than reported by the Point-in-Time count due to the often-transient nature of homeless living arrangements and other difficulties in obtaining accurate data. Conversations with local service providers indicate that while persons experiencing homelessness can occur throughout the City, higher concentrations of unsheltered persons can generally be found along flood control channels, within open space areas in the northern and eastern foothills, and within cars and RVs parked along Arrow Highway.

Overall, the data suggest that the more urbanized central, south-central, and southwestern areas of the City contain higher concentrations of vulnerable populations, likely due to the relatively higher incidence of multi-family housing, mobile home parks, and age-restricted and assisted housing developments. Areas that are less likely to have significant vulnerable populations are largely concentrated in the northern and eastern portions of the City, which are predominantly made up of single-family residential uses and open space. These northern and eastern areas of the City are developmentally constrained due to steep hillsides, endangered or protected flora and fauna, and wildfire potential. It is important to note, however, that the absence of data showing concentrations of vulnerable groups within the northern and eastern areas of the City does not mean that vulnerable populations do not exist in these areas. While it is important to identify socially vulnerable groups and develop targeted assistance programs, it is equally important to support broad-based strategies that address the community as a whole. 56 California Environmental Protection Agency, SB 535 Disadvantaged Communities (2022 Update), https://oehha.ca.gov/calenviroscreen/sb535, accessed July 23, 2024. 57 Los Angeles Homeless Services Authority, Homeless Count By City in the LA CoC, https://www.lahsa.org/homeless-count/dashboards/hc24- localities-dashboard, accessed September 10, 2024.

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FIGURE 4-13: OVERALL SVI
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

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FIGURE 4-14: SOCIOECONOMIC SVI
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

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FIGURE 4-15: HOUSEHOLD CHARACTERISTICS
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

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FIGURE 4-16: RACIAL AND ETHNIC MINORITY STATUS
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

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FIGURE 4-17: HOUSING TYPE/TRANSPORTATION
Source: Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, CDC/ATSDR Social Vulnerability Index 2022 database California, accessed July 17, 2024.

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Other Assets
In addition to critical facilities, facilities of concern, and vulnerable populations, other assets could be affected by hazards, including services, cultural resources, or local economic activities. The vulnerability/risk assessment describes the potential harm to these other assets based on available information.

VULNERABILITY ASSESSMENT
Dam/Reservoir Failure
A significant portion of the City is located within dam inundation areas, including the central and southern areas of the City, trending in a southwesterly direction, generally between Little Dalton Wash and Big Dalton Wash, and along San Dimas Wash. As shown in Table 4-18, Critical Facilities in a Dam Inundation Areas, 22 critical facilities and four facilities of concern are located with dam inundation areas.

TABLE 4-18: CRITICAL FACILITIES IN A DAM INUNDATION AREAS Map # Facility Type Owner/Responsible
Agency
Total Loss
Potential
Critical Facilities
1 Glendora Police Facility /
City Transmitter Site Government City of Glendora $8,704,522 2 Glendora City Hall Government City of Glendora $8,008,112 3 Glendora Library and
Cultural Center Government City of Glendora $16,011,728 13 La Fetra Senior Center Community City of Glendora $6,564,780 16 American Legion Building Community City of Glendora $3,059,853 23 I-210 Overcrossing at Grand
Ave
Transportation
Infrastructure Caltrans Not Available
24 Foothill Christian School #1 School Foothill Christian Not Available 28 I-210 Overcrossing at
Barranca Ave
Transportation
Infrastructure Caltrans Not Available
29 LA Dept of Water and Power
High Voltage Transmission
Lines
Electrical
Infrastructure
Los Angeles
Department of Water
and Power
Not Available
31 Covina Irrigating Company Water/Wastewater
Infrastructure
Covina Irrigating
Company Not Available
32 City of Glendora Water Yard Water/Wastewater
Infrastructure City of Glendora $3,943,885
34 Cullen Elementary School School Glendora Unified
School District Not Available
35 Glendora USD Office /
Sellers Elementary School School Glendora Unified School District Not Available 38 A Line (Gold Line) / Railroad
Overcrossing
Transportation
Infrastructure
Los Angeles County
Metropolitan
Transportation
Authority
Not Available
40 Glendora City Yard Government City of Glendora $2,796,670 Glendora Local Hazard Mitigation Plan
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Map # Facility Type Owner/Responsible
Agency
Total Loss
Potential
41 Glendora High School School Glendora Unified
School District Not Available
43 I-210 Overcrossing at Lone
Hill Ave
Transportation
Infrastructure Caltrans Not Available
53 LA County Fire Station #85 Government Los Angeles County Fire Department Not Available
56 Big Dalton Dam
Los Angeles County
Department of Public
Works
Not Available
57 Little Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
58 Big Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
60 Morgan Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
Facilities of Concern
14 City Transportation Center Government City of Glendora $1,064,061 17 Liberty House Community City of Glendora $333,041
39 Glendora Community
Service Yard Government City of Glendora $593,712
55 Angeles National Forest
Glendora Ranger Station Government U.S. Forest Service Not Available The areas of the City identified as having the potential for inundation associated with a dam/reservoir failure primarily include, but are not limited to, residential, commercial, and civic uses. Major roadways within inundation areas include Sierra Madre Avenue, Foothill Boulevard, Route 66, Valley Center Avenue, Grand Avenue, Glendora Avenue, Lone Hill Avenue, and Gladstone Street. I-210 is also located within a dam inundation area but is unlikely to be affected as it is elevated above grade; on- and off-ramps connecting to I-210, however, could be impacted.

A failure could damage critical facilities and infrastructure (e.g., roads, water, wastewater, electricity, natural gas), resulting in short-term interruption or extended loss of surface, loss of business income, and displacement of individuals and businesses. A catastrophic dam failure, depending on the size of the dam and the population downstream, could exceed the response capability of public safety personnel and resources, or significantly impair their ability to respond.

It is noted that Table 4-18 includes critical facilities and facilities of concern that may only be partially located within dam inundation area boundaries. For instance, some portions of the Glendora Civic Center, which houses the Glendora Police Facility, City Hall, and Library and Cultural Center (map numbers 1, 2, and 3, respectively), are subject to dam inundation at maximum flood depths of 1-2 feet, while other portions of these facilities are located outside of dam inundation areas. The primary Police Facility building is not within an inundation area, but an eastern extension of the building, which currently houses the Glendora IT Department, is subject Glendora Local Hazard Mitigation Plan
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to maximum flood depths of 1-2 feet. Similarly, the majority of the City Hall building is not within an inundation area, but the eastern portion of the building, which currently houses the council chambers and other offices, is subject to maximum flood depths of 1-2 feet.

According to U.S. Census ACS estimates (2017-2021), the census tracts containing inundation areas have a mix of median household incomes, ranging from the lowest in the City ($66,740) to the highest in the City ($178,438). Areas of the City with lower median household incomes are generally located in the central, southern, and western portions of Glendora, which are further downstream from dams and generally have lower maximum inundation depths and a longer time of arrival than areas upstream with higher median household incomes. Inundation areas also include census tracts with a mix of percentage of population with a disability, with areas in the northeast and west generally having lower percentages of population with a disability; and a mix of percentage of renter-occupied housing units, with higher proportions of renters generally located in the central portion of the City. All census tracts within inundation areas have a low (less than five percent) percentage of population living alone; and a lower (less than ten percent) percentage of housing units experiencing overcrowding.

There is the potential that lower-income households and households experiencing housing costs as a greater percentage of their income within the City could be susceptible to cost burden with limited income and resources and may experience greater difficulties in the event they need to leave the area for an extended period of time. A dam or reservoir failure could also impact more vulnerable populations, such as senior citizens and persons with disabilities, as they may not have access to transportation to evacuate the area. Additionally, there is the potential for community members to be impacted due to damage to utility transmission lines and infrastructure outside of the immediate hazard area.

Land use and population patterns have not substantially changed within Glendora since preparation of the 2015 Natural Hazards Mitigation Plan. New development in Glendora over the last decade has been minimal; thus, vulnerabilities to land uses and populations related to dam and reservoir failure are similar. As discussed in Section 3.6, Development Trends and Future Development, future residential and mixed-use development is anticipated to occur primarily within the Route 66 Corridor Specific Plan, Arrow Highway Specific Plan, and other urbanized areas located in the central, southern, and western portions of the City. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur within these areas, some of which are within dam inundation areas. Residential growth is also anticipated throughout the City in the form of new accessory dwelling unit (ADUs). However, future development is not anticipated to significantly increase vulnerabilities associated with dam/reservoir failure. Future development projects would be subject to applicable federal, State, and local laws and regulations, including the latest iteration of the Building Code and City’s floodplain management regulations, that would decrease vulnerability associated with dam/reservoir failure. Further, all dams with the potential to inundate parts of Glendora have received a condition assessment rating of “satisfactory” by the DSOD.

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Drought
Drought conditions would affect the entire Glendora planning area; therefore, all critical facilities and facilities of concern, businesses, and residents within the City are considered vulnerable to drought hazards. Droughts do not typically result in physical damage to buildings and infrastructure, thus critical facilities and facilities of concern are not at risk of destruction or structural failure.

Prolonged drought conditions often result in stricter conservation measures, such as targeted reduction percentages or penalties for using potable water above a specific threshold. Higher rates or penalties could disproportionately impact lower-income households or residents on a fixed income. Water service providers in the City (i.e., Glendora Water Division, Suburban Water Systems, and City of Azusa Light & Water Department) are required to prepare and adopt Water Shortage Contingency Plans (WSCP) to prepare for and respond to water shortages. A water shortage, when water supply available is insufficient to meet the normally expected customer water use at a given point in time, may occur due to several reasons, such as drought, climate change, and catastrophic events. The WSCP serves as an operating manual to prevent catastrophic service disruptions through proactive, rather than reactive, management.

Vulnerabilities to drought conditions within Glendora are typically associated with drought conservation measures, which may include targeted reduction percentages and higher rates or penalties. Higher water rates or penalties could disproportionately impact lower-income households or residents on a fixed income residing within the City. Households that earn 30 percent or less than the County’s median income (up to $41,600 for a family of four in 2024, based on HCD Income Limits) are considered “extremely low-income.” Extremely low-income (ELI) households are more likely to contain seniors on fixed incomes, persons with disabilities, and other special-needs groups such as large families, families with female heads of households, and persons in need of emergency shelter. Within Glendora, approximately 11.7 percent of the total number of households are ELI households.58 ELI households represent a smaller percentage of households in Glendora when compared to the County as a whole (21.0 percent of County households are ELI households). ELI households in Glendora are more likely to be renters than homeowners. Based on 2016-2020 Comprehensive Housing Affordability Strategy (CHAS) data, ELI households comprise 9.2 percent of owner-occupied households compared to 17.7 percent of renter-occupied households. ELI households are particularly susceptible to cost burden, or paying at least 30 percent of gross monthly income toward housing-related costs, reducing the ability for households to have money available for other necessities and emergency expenditures.

Some businesses, such as restaurants, can also be vulnerable to drought and water conservation measures. The City does not have a significant share of industries typically known to utilize large amounts of water, such as farming and manufacturing.
58 U.S. Department of Housing and Urban Development, Consolidated Planning/CHAS Data 2016-2020, https://www.huduser.gov/portal/datasets/cp.html, accessed September 10, 2024.

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Prolonged drought conditions can also cause impacts to the environment, resulting in dead or dried vegetation, dry soils, damage to wildlife habitat, and degradation of landscape quality. These conditions can increase the vulnerability of other hazards within the community, such as wildfires.

Minimal new development has occurred in the City since the adoption of the 2015 Natural Hazards Mitigation Plan; thus, vulnerabilities to drought related to development have remained similar over that time period. As discussed in Section 3.6, the 2021-2029 Housing Element accommodates the City’s RHNA allocation of 2,276 housing units. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur, resulting in additional residential and mixed-use development. However, future growth within the City is not expected to substantially increase vulnerabilities associated with drought. New development would be required to install water efficient fixtures and landscaping pursuant to requirements of the City’s Municipal Code. Additionally, water suppliers take growth projections into account when planning for future water supply and have accounted for population growth in the City. UWMPs are required to be updated every five years to ensure that adequate water supplies are available to meet existing and future water needs. As part of the UWMPs, a drought risk assessment assesses the reliability of water supplies by comparing projected future water demands with expected available water supplies under normal year, single dry year, and multiple dry year conditions. Because of the history of droughts within California, UWMPs are required to address reliability and provide for contingency plans in the event of drought or other water interruptions.

Flood
According to FEMA FIRMs, there are no mapped 100-year flood or regulatory floodways within the City. A small portion of the northwestern portion of the City, generally along Sierra Madre Avenue, is located within the 500-year floodplain. Additionally, the northern and eastern foothills of the City have not been mapped for flood hazards by FEMA. These unmapped areas generally consist of open space and low-density residential uses. There are no critical facilities or facilities of concern in Glendora located within the 100- or 500-year floodplain.

The majority of developed areas in Glendora are identified by FEMA as Zone X, meaning that the area has minimal risk of flood hazard. A relatively small number of single-family residential uses located near Sierra Madre Avenue in the western portion of the City are located within the FEMAidentified 500-year floodplain. Waterways in the City include three concreted-lined flood control channels, which are designed to manage floodwater flows. However, infrastructure and flood control facilities could be overwhelmed during a large storm event, resulting in flooding not limited to the FEMA flood zones. A significant flood resulting in damage to critical transportation facilities could interfere with the ability to evacuate specific areas of the community or to provide emergency response and equipment to an area. Similarly, localized flooding of roadways can strand motorists and hinder access to and from an area.

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Residents with mobility challenges and those without access to reliable transportation may have difficulty evacuating during a flood event. Vulnerable populations with regards to flooding include seniors, persons with disabilities, and lower-income households, as these populations may experience greater mobility challenges or access limitations to personal transportation. According to U.S. Census ACS estimates (2017-2021), approximately 15.6 percent of the City’s population is 65 years of age or older. While the City’s median household income of $103,159 is relatively high compared to the County’s median household income of $76,367, approximately 11.7 percent of the total number of households in Glendora are ELI households, meaning they earn 30 percent or less than the County’s median income. Areas of Glendora with lower median incomes are concentrated in the central and southwestern areas of the City, which are correlated with a higher proportion of multi-family residential units, mobile home parks, and seniors.

Land use and population patterns have not substantially changed within the City’s Planning Area since preparation of the 2015 Natural Hazards Mitigation Plan; thus, vulnerabilities to land uses and populations related to flood hazards are similar. As discussed in Section 3.0, future residential and mixed-use development is anticipated to occur primarily within the Route 66 Corridor Specific Plan, Arrow Highway Specific Plan, and other urbanized areas located in the central, southern, and western portions of the City. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur within these areas. These areas are not located within FEMA-designated flood hazard zones and future growth is not anticipated to increase vulnerabilities to flooding. Minimal residential growth is also anticipated throughout the City in the form of new ADUs, which could be built in the area of undetermined flood levels. Future development projects would be subject to applicable federal, State, and local laws and regulations, including the latest iteration of the Building Code and City’s floodplain management regulations, that would decrease vulnerability associated with flood hazards.

Repetitive Loss and Severe Repetitive Loss
Addressing risk to repetitive loss and severe repetitive loss structures is an important step in reducing the financial impact of flooding as repetitive losses require extensive disaster management resources and high NFIP claims.

FEMA defines a repetitive loss as any NFIP-insured structure that has had at least two paid flood losses of more than $1,000 each in any 10-year period since 1978. FEMA defines a severe repetitive loss as any NFIP-insured structure that has met one of the following paid flood loss criteria since 1978:
• Four or more separate claim payments of more than $5,000 each (Including building and contents payments); or
• Two or more separate claim payments (building payments only) where the total of the payments exceeds the current value of the property.

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The City of Glendora is not a participant in the NFIP since the City is located within Zone X, as identified on the FIRM. Zone X is an area of moderate or minimal hazard from the principal source of flood in the area. Glendora does not have any repetitive loss or severe repetitive loss properties.

Seismic and Geologic Hazards
The entire Glendora Planning Area is at risk of experiencing strong ground shaking as a result of an earthquake. During a seismic event, critical facilities and facilities of concern as well as residences, businesses, and infrastructure could be damaged. The extent of damage would depend upon the location and magnitude of the earthquake. Depending upon the damage, emergency services, communication systems, and utility services may all be hindered. Senior citizens and persons with disabilities that have limited mobility may be harmed if they are unable to react quickly and seek out areas of safety from falling debris. As previously stated, 15.6 percent of the City’s population is 65 years of age or older. According to CHAS data, over 48 percent of all senior households had extremely low, very low, or low incomes. Approximately 10.0 percent of Glendora residents reported having one or more disabilities.

In addition to mobility limitations and the potential to be harmed during an earthquake, some populations may experience significant challenges in the event their homes are damaged and require repairs or displacement due to the extent of damages. Approximately 77.7 percent of the City’s housing stock was constructed prior to 1980. Although a majority of the City’s housing stock is not considered substandard or in need of rehabilitation or replacement, there is the potential for large portions of the housing stock to be susceptible to damage associated with a more significant earthquake. Additionally, approximately 11.7 percent of the total number of households in Glendora are ELI households. ELI households are particularly susceptible to cost burden, or paying at least 30 percent of gross monthly income toward housing-related costs, reducing the ability for households to have money available for other necessities and emergency expenditures, including structural repairs are relocation funding in the event their home becomes unlivable.

Further, extended interruptions in services, including power outages, would disproportionately affect people with medical conditions requiring power for medical equipment. Depending upon the extent of damage, businesses could be closed and experience economic losses.

Portions of the City are also at risk for seismic-induced landslides and liquefaction. Table 4-19, Critical Facilities in a Landslide Zone and Table 4-20, Critical Facilities in a Liquefaction Zone, identify the critical facilities located within landslide and liquefaction zones, respectively.

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TABLE 4-19: CRITICAL FACILITIES IN A LANDSLIDE ZONE
Map # Facility Type Owner/Responsible
Agency
Total Loss
Potential
Critical Facilities
56 Big Dalton Dam
Los Angeles County
Department of Public
Works
Not Available
61 San Dimas Dam
Los Angeles County
Department of Public
Works
Not Available
TABLE 4-20: CRITICAL FACILITIES IN A LIQUEFACTION ZONE
Map # Facility Type Owner/Responsible
Agency
Total Loss
Potential
Critical Facilities
44 I-210 Overcrossing at
Railroad tracks
Transportation
Infrastructure Caltrans Not Available
45 A Line (Gold Line)
Overcrossing at Lone Hill
Ave
Transportation
Infrastructure
Los Angeles County
Metropolitan
Transportation
Authority
Not Available
47 I-210/SR-57
Overcrossing at Auto
Centre Dr
Transportation
Infrastructure Caltrans Not Available
48 I-210 Overcrossing at
Amelia
Transportation
Infrastructure Caltrans Not Available
57 Little Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
58 Big Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
Landslides can damage structures and block roadways causing long-term disruptions to the roadway network, infrastructure systems and City capabilities. Utility lines in slide-prone areas can be damaged in a landslide, causing service outages. Liquefaction can also damage buildings and infrastructure, including pipelines within soils subject to liquefaction. Damage to transportation infrastructure can impede access and hinder emergency response and evacuation.

Damaged utilities can result in service interruptions or complete outages. Lower income households, those on fixed incomes, and those with mobility challenges or no access to transportation may have difficulty evacuating an area and may have more difficulty in the event of displacement.

The areas identified as having the potential for landslide susceptibility primarily occur within the northern and eastern foothills, as well as the “South Hills” located in the southern portion of the City. These areas have not been identified as having significant concentrations of socially vulnerable populations; however, socially vulnerable persons may reside in these areas. Areas with the potential for liquefaction hazards within the City primarily occur within the northern Glendora Local Hazard Mitigation Plan
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foothills, a western portion of the City along Foothill Boulevard, and the southeastern portion of the City along I-210. These areas are shown to have households with incomes near or above the HCD State Median Income of $111,300, and a relatively high percentage of homeowners; however, between 40 and 60 percent of homeowners in these areas pay more than 30 percent of their household income on their mortgage. Thus, vulnerable populations within these areas may include low-income households experiencing housing costs as a greater percentage of their income. These households could be susceptible to cost burden with limited income and resources and may experience greater difficulties in the event they need to leave the area for an extended period in the event their residence experiences damage associated with landslide or liquefaction activity.

Minimal new development has occurred in the City since development of the 2015 Natural Hazards Mitigation Plan; thus, vulnerabilities to seismic and geologic hazards have remained similar over that time period. Construction within the City has taken geologic conditions, including landslide- and liquefaction-susceptibility into consideration. Future residential and mixed-use development is anticipated to occur primarily within the Route 66 Corridor Specific Plan, Arrow Highway Specific Plan, and other urbanized areas located in the central, southern, and western portions of the City. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur within these areas, including residential and non-residential development. However, future growth within these areas is not expected to substantially increase vulnerabilities associated with seismic and geologic hazards, as future development projects would be subject to applicable federal, State, and local laws and regulations, including the Building Code, which would reduce vulnerabilities associated with these hazards.

Severe Weather
A severe weather event, such as heavy rains, Santa Ana winds, and extreme heat conditions, could affect the entire City; therefore, all critical facilities and facilities of concern, business, and residents within the area are considered vulnerable to severe weather hazards. Heavy rain can damage structures if the roof is compromised, or drainage systems overflow and cause flooding.

Landslides, slope instability, and mudflows can also occur along slopes and along creeks and channels. Flooding of roadways can also occur, stranding vehicles and limiting emergency access and response. Santa Ana wind events can damage structures, particularly from falling trees or branches or potential debris that is carried by the wind. Extreme heat events do not typically result in damage to structures. However, these events can place greater demand on the power system and result in power outages that can impact residents and businesses. Young children, the elderly, or people suffering from serious medical conditions are physiologically more vulnerable to heatstroke. People requiring the use of medical equipment with a power source could be impacted. Additionally, people experiencing homelessness are also at higher risk of health complications during an extreme heat event. Lower-income households or those with limited mobility may be unable to acquire or seek out cooling devices without significant advance preparations. This can be further compounded by the threat of Public Safety Power Shutoff Glendora Local Hazard Mitigation Plan
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events. During these events, extreme heat impacts may affect larger portions of the City and populations that would not be viewed as vulnerable under normal circumstances.

The impact on socially vulnerable populations would be dependent upon the event and what types of facilities, services, and operations are impacted. There is the potential that if some services, such as medical, public transit, and social services are impacted to the extent that they could not operate, that the elderly, persons with disabilities, and lower-income households reliant on these services would experience significant challenges. These populations would also be more vulnerable to extreme heat events, as they may not have access to air conditioning or the financial means to provide air conditioning for extended periods of time. Some people may be required to work outside or travel via walking or public transit which could increase their exposure to the elements. Extended exposure to extreme heat could result in severe medical conditions.

As described above, 15.6 percent of the City’s population is 65 years of age or older.

Approximately 10.0 percent of Glendora residents reported having one or more disabilities.

Households that earn 30 percent or less than the County’s median income (up to $41,600 for a family of four in 2024) are considered ELI households. Within Glendora, approximately 11.7 percent of the total number of households are ELI households. ELI households are particularly susceptible to cost burden and therefore may not have the financial means or the existing resources to alleviate extreme heat conditions, or address damage that could occur from significant rain and Santa Ana wind events.

Minimal new development has occurred in the City since development of the 2015 Natural Hazards Mitigation Plan and has not exacerbated vulnerabilities related to severe weather. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur, resulting in additional residential and mixed-use development. Future growth in the City is not expected to substantially increase vulnerabilities associated with severe weather.

Wildfire
A significant portion of the City is located within a fire hazard zone. Table 4-21, Critical Facilities in a Fire Hazard Zone, identifies the critical facilities and facilities of concern located within fire hazard zones. These include dams/reservoirs.

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TABLE 4-21: CRITICAL FACILITIES IN A FIRE HAZARD ZONE
Map # Facility Type Owner/Responsible
Agency
Total Loss
Potential
Critical Facilities
56 Big Dalton Dam
Los Angeles County
Department of Public
Works
Not Available
57 Little Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
58 Big Dalton Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
60 Morgan Debris Basin Dam
Los Angeles County
Department of Public
Works
Not Available
61 San Dimas Dam
Los Angeles County
Department of Public
Works
Not Available
FHSZ areas are located in the northern and eastern foothills of the City and include single-family residential and open space uses. Wildfires can impact structures and also impact people, especially in the event of an evacuation. Seniors and persons with disabilities may have limited mobility and therefore evacuation may be a greater challenge. Persons with disabilities may require special mobility devices or caregiver assistance to evacuate. Other groups with increased threat levels include people with lower-incomes, renters, and persons experiencing homelessness. These groups may not possess enough financial resources to rebuild their homes or search for new homes in the event of evacuation or damage resulting from a wildfire.

Depending upon the location and extent of the fire, transportation routes could be impaired or inaccessible, which could impede evacuation and hinder emergency response. Evacuation and shelter areas may not be available to evacuees depending upon the location of the wildfire.

Wildfires within the area, even if not within the City, can also impact people’s health due to the poor air quality. Senior citizens, youth, and people with preexisting medical conditions are most at risk. Utility systems could be damaged or interrupted. Controlled and proactive power outages are highly likely during a wildfire event to reduce the risk for additional fires to be initiated. These power outages can extend beyond the area of the fire.

Similar to severe weather conditions, the impact on socially vulnerable populations within Glendora would be dependent upon the event, location, and severity. A wildfire could directly damage residences, businesses, service providers, transportation and utility infrastructure, or cause services to be impacted. Direct impacts to these facilities would greatly impact those that may not have the financial means to address the damage, cannot relocate to other areas, do not have alternative transportation options, or have medical conditions that limit their mobility and could result in greater health-related impacts. Within Glendora, this would include the elderly, persons with disabilities, and those households with lower incomes, as previously described.

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Minimal new development has occurred in the City since development of the 2015 Natural Hazards Mitigation Plan. This development has occurred primarily as infill in existing urbanized areas; thus, vulnerabilities to wildfire have remained similar over that time period. Future residential and mixed-use development is anticipated to occur primarily within the Route 66 Corridor Specific Plan, Arrow Highway Specific Plan, and other urbanized areas located in the central, southern, and western portions of the City. These areas are not identified as very high or high fire hazard severity zones. Additionally, these areas are developed with existing urban uses and not located adjacent to wildland urban interface areas. While it is unlikely that all anticipated growth would occur within the five-year period of this LHMP, the City anticipates some level of population growth to occur within these areas, including residential and non-residential development. However, future growth within these areas is not expected to substantially increase vulnerabilities associated with wildfire, as future development projects would be subject to applicable federal, State, and local laws and regulations, including the Fire Code, which would reduce vulnerabilities.

Summary of Vulnerability
Overall, FEMA’s National Risk Index identifies Los Angeles County as having a Risk Index rating of “Very High” when compared to the rest of the United States. The Risk Index components for the County include a rating of very high for expected annual loss; very high for social vulnerability; and very low for community resilience.

For the census tracts comprising Glendora, the Risk Index rating ranges from “Relatively Low” to “Relatively High.” Expected annual losses range from “Relatively Low” to “Relatively High,” with the highest losses throughout the City attributed to earthquakes and wildfire.

Table 4-22, Risk Assessment Summary, shows a summary of critical facilities and facilities of concern that intersect with hazard areas in the City. Those facilities that intersect with a hazard area are indicated with a “Y” and a red-shaded cell. Critical facilities and facilities of concern that do not fall within the hazard area are designated with an “N” and a green-shaded cell. The risks of drought, ground shaking, and severe weather are considered to have the potential to impact the entire community.

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TABLE 4-22: RISK ASSESSMENT SUMMARY
Map
ID Name
Dam/
Reservoir Failure
Drought
Flood
Ground Shaking
Landslides
Liquefaction
Severe Weather
Wildfire
1 Glendora Police Facility / City
Transmitter Site N Y N Y N N Y N
2 Glendora City Hall N Y N Y N N Y N
3 Glendora Library and Cultural
Center Y Y N Y N N Y N
4 Frontier Telephone Center N N Y N N Y N
5 Foothill Presbyterian Hospital N Y N Y N N Y N
6 Foothill Medical Arts Building N Y N Y N N Y N
7 A Line (Gold Line) Overcrossing N N Y N N Y N
8 Citrus College N N Y N N Y N
9 St. Lucy’s Priory High School N N Y N N Y N
10 Sandburg Middle School N Y N Y N N Y N
11 La Fetra Elementary School N Y N Y N N Y N
12 LA County Fire Station #151 N Y N Y N N Y N
13 La Fetra Senior Center Y Y N Y N N Y N
14 City Transportation Center Y Y N Y N N Y N
15 Glendora Youth Center N Y N Y N N Y N
16 American Legion Building Y Y N Y N N Y N
17 Liberty House Y Y N Y N N Y N
18 I-210 Overcrossing at Glendora
Ave N Y N Y N N Y N
19 LA Dept of Water and Power
High Voltage Transmission
Lines

N Y N Y N N Y N
20 Crowther Teen Center N Y N Y N N Y N
21 SCE Sub-Station N Y N Y N N Y N
22 LA Dept of Water and Power
High Voltage Transmission
Lines

N Y N Y N N Y N
23 I-210 Overcrossing at Grand
Ave Y Y N Y N N Y N
24 Foothill Christian School #1 Y Y N Y N N Y N
25 Foothill Christian School #2 N Y N Y N N Y N
26 Whitcomb High School N Y N Y N N Y N
27 Stanton Elementary School N Y N Y N N Y N
28 I-210 Overcrossing at Barranca
Ave Y Y N Y N N Y N
29 LA Dept of Water and Power
High Voltage Transmission
Lines

Y Y N Y N N Y N
30 Washington Elementary School N N Y N N Y N
31 Covina Irrigating Company Y Y N Y N N Y N
32 City of Glendora Water Yard Y Y N Y N N Y N
33 Goddard Middle School N Y N Y N N Y N
34 Cullen Elementary School Y Y N Y N N Y N
35 Glendora USD Office / Sellers
Elementary School Y Y N Y N N Y N
36 Hope Lutheran School N Y N Y N N Y N
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Map
ID Name
Dam/
Reservoir Failure
Drought
Flood
Ground Shaking
Landslides
Liquefaction
Severe Weather
Wildfire
37 Williams Educational Center N Y N Y N N Y N
38 A Line (Gold Line) / Railroad
Overcrossing Y Y N Y N N Y N
39 Glendora Community Service
Yard Y Y N Y N N Y N
40 Glendora City Yard Y Y N Y N N Y N
41 Glendora High School Y Y N Y N N Y N
42 LA County Fire Station #86 N Y N Y N N Y N
43 I-210 Overcrossing at Lone Hill
Ave Y Y N Y N N Y N
44 I-210 Overcrossing at Railroad
tracks N Y N Y N Y Y N
45 A Line (Gold Line) Overcrossing
at Lone Hill Ave N Y N Y N Y Y N
46 LA Dept. of Water and Power
High Voltage Transmission
Lines

N Y N Y N N Y N
47 I-210/SR-57 Overcrossing at
Auto Centre Dr N Y N Y N Y Y N
48 I-210 Overcrossing at Amelia N Y N Y N Y Y N
49 Water Storage Facility N Y N Y N N Y N
50 Willow Elementary School N Y N Y N N Y N
51 I-210 Overcrossing at
Sunflower Ave N Y N Y N N Y N
52 Sunflower School N Y N Y N N Y N
53 LA County Fire Station #85 Y Y N Y N N Y N
54 I-210 Overcrossing at Bonnie
Cove N Y N Y N N Y N
55 Angeles National Forest
Glendora Ranger Station Y Y N Y N N Y N
56 Big Dalton Y Y N Y Y N Y Y
57 Little Dalton Debris Basin Y Y N Y N Y Y Y
58 Big Dalton Debris Basin Y Y N Y N Y Y Y
59 Puddingstone Diversion* Y Y N Y N N Y N
60 Morgan Debris Basin Y Y N Y N N Y Y
61 San Dimas* Y Y N Y Y N Y Y
Note: * These critical facilities are located outside of the Glendora Planning Area but have dam inundation areas affecting the City.

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Section 5.0 | Hazard Mitigation
Strategy
Hazard mitigation strategies are used to reduce hazard impacts on residents, public infrastructure, and critical facilities. The hazard mitigation actions will help to protect the safety and well-being of residents and visitors, critical facilities, facilities of concern, other buildings and structures, key services, the local economy, and other important community assets. Some actions will also help with emergency preparedness, allowing for a more effective community response to hazard events. Preparedness actions are not a required component of an LHMP, but they support and complement mitigation activities, and the Planning Team chose to include them as part of the overall hazard mitigation strategy.

This section of the LHMP is derived from an in-depth review of the vulnerabilities and capabilities described in this plan. Overall, the actions represent the City’s risk-based approach for reducing and/or eliminating the potential losses as identified in the Vulnerability/Risk Assessment section.

5.1 CAPABILITIES ASSESSMENT
This capabilities assessment has been designed to identify existing local agencies, personnel, planning tools, public policy and programs, technology, and funds that have the capability to support hazard mitigation activities and strategies outlined in this plan. The Planning Team collaborated to identify capabilities and mechanisms available to the City and partner agencies for reducing damage from future hazard events. After initial identification, the capabilities were reviewed again and updated in the context of developing the mitigation actions.

The capabilities assessment considered the following types of resources:
 Planning and regulatory capabilities are based on the implementation of ordinances, policies, local laws and State statutes, and plans and programs that relate to guiding and managing growth and development.
 Administrative and technical capabilities refer to the community’s staff and their skills and tools that can be used for mitigation planning and to implement specific mitigation actions. It also refers to the ability to access and coordinate these resources effectively.  Financial capabilities are the resources that a jurisdiction has access to or is eligible to use to fund mitigation actions.
 Education and outreach capabilities are programs and methods already in place that could be used to implement mitigation activities and communicate hazard-related information.

Table 5-1, Capabilities Assessment, summarizes the capabilities assessment for Glendora.

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TABLE 5-1: CAPABILITIES ASSESSMENT
Resources Description of Ability to Support Mitigation
Planning & Regulatory
General Plan
Responsible Department:

Community Development
Department
The Glendora General Plan establishes the overall vision for future growth and development. As a blueprint for the future, the plan contains policies and programs designed to provide a solid basis for decisions related to land use and development. The General Plan provides the framework for the implementation of the LHMP mitigation actions. The Safety Element identifies hazards that could impact the community and establishes policy for the preparation and update of the LHMP. The City is updating the General Plan Safety Element concurrent with the LHMP and will incorporate the LHMP into its Safety Element to ensure compliance with AB 2140, making the City eligible for additional funding under the California Disaster Assistance Act (CDAA). As future General Plan Updates occur, hazard information will be updated to reflect current conditions, including updated mapping and assessments of hazards to be considered when determining the placement and development of land uses.

Zoning Ordinance
Responsible Department:

Community Development
Department
The Glendora Zoning Ordinance implements the General Plan by establishing regulations for land use control within the City, including where and how development occurs. Zoning is used to protect the public health, safety and welfare of a community. The City can use the Zoning Ordinance to implement mitigation actions to reduce risks associated with future development. The Zoning Ordinance is incorporated into Municipal Code as Title 21.

Subdivision Ordinance
Responsible Department:

Community Development
Department
The City’s Subdivision Ordinance regulates development of housing, commercial, industrial, or other uses, including associated public infrastructure, as land is subdivided into buildable lots. The Subdivision Ordinance can ensure future subdivisions account for the risk of hazards on future development. The Subdivision Ordinance is included as Title 20 of the Municipal Code.

Building Code
Responsible Department:

Community Development
Department
The Building Code regulates how buildings are constructed. The City adopts the State Building Code with amendments, as applicable.

Mitigation actions to construct buildings to safer standards to better resist damage during a hazard event could be considered as part of future building code updates. The Building Code is incorporated as Chapter 19.02 of the Municipal Code.

Capital Improvement Program
Responsible Department:

Public Works Department
The Capital Improvement Program (CIP) is established to provide for the planning, funding, design, construction, maintenance and repair of City facilities and infrastructure. The CIP is a "roadmap" that provides direction and guidance to the City to carefully plan and manage its capital and infrastructure assets. Typical improvement and maintenance projects included within the CIP include streets, signals, and lighting; flood control and water quality; parks; and public facilities. The City can use the CIP to identify priority projects for hazard mitigation.

Los Angeles County Flood
Control District
Responsible Agency:

The Los Angeles County Flood Control District (LACFCD) was established in 1915 and provides flood risk management and water conservation to the entire County except the Antelope Valley. The LACFD Flood Maintenance Division operates and maintains dams, open channels, storm drains, debris basins, and pumping plants, Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
County of Los Angeles, Los
Angeles County Flood Control
District
while the Watershed Management Division handles the National Pollutant Discharge Elimination System (NPDES) Permit Program, which controls water pollution by issuing permits to industrial, municipal, or other facilities that discharge pollutants into surface water.

Upper San Gabriel River
Enhanced Watershed
Management Program
Responsible Agencies:

County of Los Angeles, Los
Angeles County Flood Control
District and City of Glendora
The Upper San Gabriel River Enhanced Watershed Management Program (EWMP) fulfills the requirements of the NPDES Municipal Separate Storm Sewer System (MS4) Permit Order No. R4-2012- 0175. The EWMP contains strategies, watershed control measures, and best management practices (BMPs), including multi-benefit regional projects that retain and infiltrate stormwater runoff from the 85th-percentile, 24-hour storm event for the upper portion of the San Gabriel River Watershed, to which the City contributes runoff.

Urban Water Management Plan
Responsible Agencies:

City of Glendora Public Works
Department, Suburban Water
Systems, and City of Azusa
Light & Water Department
Urban Water Management Plans (UWMP) are prepared every five years. An UWMP provides long-term resource planning to ensure that adequate water supplies are available to meet existing and future water needs. The UWMP addresses drought conditions and the ability to provide water to its customers. The UWMP can be used to coordinate and implement mitigation actions associated with drought and water supply reliability.

Water Shortage Contingency
Plan
Responsible Agency:

City of Glendora Public Works
Department, Suburban Water
Systems, and City of Azusa
Light & Water Department
The Water Shortage Contingency Plan (WSCP) is a strategic planning document designed to prepare for and respond to water shortages. This plan is used to prevent catastrophic service disruptions through proactive, rather than reactive, management.

This WSCP provides a structured guide for the District to deal with water shortages, incorporating prescriptive information and standardized action levels, along with implementation actions in the event of a catastrophic supply interruption.

Greater Los Angeles County
Region Integrated Regional
Water Management Plan
Responsible Agencies:

County of Los Angeles, Los
Angeles County Flood Control
District
The purpose of the Greater Los Angeles County Region Integrated Regional Water Management Plan (IRWMP) is to define a clear vision and direction for the sustainable management of water resources in the Greater Los Angeles County. The IRWMP identifies a comprehensive set of solutions to reduce the region’s reliance on imported water; comply with water quality regulations by improving the quality of urban runoff, stormwater and wastewater; protect, restore and enhance natural processes and habitats; increase watershed friendly recreational space for all communities; reduce flood risk in flood prone areas by either increasing protection or decreasing needs using integrated flood management approaches; and adapt to and mitigate against climate change vulnerabilities. The IRWMP can be used to coordinate and implement mitigation actions associated with drought and water supply reliability.

Los Angeles County Water Plan
Responsible Agencies:

County of Los Angeles, Public
Works Department
The Los Angeles County Water Plan (CWP) focuses on achieving regional water resilience through a framework of targets and strategies organized around four key focal areas: improving regional water supply reliability by better leveraging our collective local and imported water resources and infrastructure; realizing our shared groundwater management opportunities by sharing expertise and resources to overcome challenges; ensuring a consistently high standard of water service for everyone in Los Angeles County by providing regional support for small systems, with focused attention Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
to under-resourced communities; and mitigating the impacts of wildfire on our water supplies through coordinated efforts between land and water managers. The CWP can be used to coordinate and implement mitigation actions associated with drought and water supply reliability.

Mutual Aid Agreements
Responsible Agencies:

City of Glendora Police
Department, City of Glendora,
Los Angeles County Fire
Department (LACoFD),
Los Angeles County Sheriff’s
Department (LASD)
The City and its public safety providers maintain agreements with emergency responders to lend assistance across jurisdictional boundaries when an emergency response exceeds local resources.

Access to these resources provides opportunities to implement mitigation actions to reduce damage and risk of injury during an event. It also provides for collaboration and sharing of information specific to hazards.
• Fire – Federal, State, and local agreements
• Police – State and local agreements
• City – State and County agreements
Los Angeles County/Operational
Area Emergency Operations
Center
Responsible Agency:

County of Los Angeles
The Los Angeles County/Operational Area Emergency Operations Center (EOC) is the central coordination point that provides for multiagency emergency coordination and support to agencies/jurisdictions within the Operational Area during an emergency or disaster. It also assists in coordination and communication between Mutual Aid Coordinators and the California Governor’s Office of Emergency Services during County-wide and State-wide emergency response and recovery operations. The EOC can be used to gather and process information to and from the County, cities, school and special districts, business and industry, volunteer organizations, individuals, and State and federal government agencies. It has the ability to function as a virtual EOC so that Operational Area Members may communicate even if the primary EOC is inaccessible or otherwise unavailable. Accurate and timely communication is critical during a hazard event and can reduce more significant damage and injury. Mitigation actions specific to communications and information can be implemented through the communication systems and response efforts to reduce risk of injury and damage.
2020 County of Los Angeles AllHazards Mitigation Plan
Responsible Agencies: County
of Los Angeles
The 2020 County of Los Angeles All-Hazards Mitigation Plan (AHMP) assesses risks posed by natural hazards and establishes a mitigation action plan to protect residents, critical facilities infrastructure, private property, and the environment from hazards in the unincorporated areas of the County and County-owned facilities.

The AHMP ensures the County’s continued eligibility for disaster relief funds from the federal and State governments.

Los Angeles County Fire
Department Strategic Fire Plan
Responsibly Agency:

LACoFD
The LACoFD Strategic Fire Plan focuses on enhancing the protection of lives, property, and natural resources from wildland fire, as well as improving environmental resilience to wildland fires. The plan identifies and prioritizes pre-fire and post-fire management strategies and tactics meant to reduce the loss of values at risk within the operational area.

Weed Abatement Program
Responsible Agencies:

The County performs weed abatement services designed to reduce fire hazards during the fire season. The weed abatement program is operated pursuant to the California Health & Safety Code sections 13879 - 14922 and Title 32 of the Los Angeles County Code, also Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
County of Los Angeles
Departments of Fire and the
Agricultural
Commissioner/Weights and
Measures
known as the Los Angeles County Fire Code. Assessment and integration can be tailored to address localized conditions, such as drought conditions and increased wildfire threat.

Wildfire Mitigation Plan Update
Responsible Agencies:

Southern California Edison
Electrical corporations are required to prepare and submit Wildfire Mitigation Plans (WMPs) to the Office of Energy Infrastructure Safety for review and approval. WMPs describe how the electrical corporation is constructing, maintaining, and operating its electrical lines and equipment in a manner that will minimize the risk of catastrophic wildfire.

Administrative & Technical
Community Development
Department
The Community Development Department provides services for long-range land planning, land development, economic
development, affordable housing, and transportation. Services include zoning review, building permits, dial-a-ride and affordable housing. The department is organized into the following four divisions: Building and Safey, Housing and Economic Development, Planning, and Transportation.

Building & Safety Division The Building and Safety Division is responsible for the building and safety standards for the design, construction, use, and occupancy, of all buildings and structures within the City. The Building and Safety Division serves as a contact point for the permit and inspection process, which may involve other departments and agencies.

Services include those operations relating to development, plan review, inspection, and enforcement of the adopted building codes and applicable codes within the City in order to ensure the safety of occupants and the general public.

Public Works Department The Public Works Department is responsible for the design, construction, and maintenance of public facilities including public streets, traffic signals, storm drains, parks, and landscaping. The Public Works Department deals with mitigation actions pertaining to public facilities, maintenance of transportation systems, maintenance of local storm drain systems, and maintenance and removal of tree limbs or debris.

Finance Department The Finance Department manages the financial operation of the City in conformity with generally accepted accounting standards and principles, and in compliance with federal and State laws. The department accounts for all City revenues and expenditures, monitors internal controls over a variety of transactions, administers water utility collections, cashiering and public counter services, payroll, accounts payable and receivable, manages several competitive grants, prepares payment of all obligations for review and approval by the City Council.

Computer Services The MyGlendora Geographic Information System (GIS) hub is an interactive portal featuring community maps and information about programs and services offered by the City. The application is accessible on the City’s website and provides the public with property specific information, including fire hazard severity zones, Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
fault zones, liquefaction zones, landslide zones, evacuation zones, and cooling center locations.

Glendora Police Department The Glendora Police Department's primary mission is to enhance the safety and security of the community by providing professional, frontline law enforcement services. Services include Patrol, Community Preservation, Investigations, Traffic, Jail, as well as the K-9 Program, and Emergency Services.

Glendora Police Department;
Emergency Services
Emergency Services is responsible for City-wide, local homeland security requirements, and conducts community relations presentations regarding emergency preparedness. Members who work and assist in the area of Emergency Services also may coordinate volunteer services such as Police Auxiliary members, Community Emergency Response Team (CERT), and Glendora
Emergency Amateur Radio Services (GEARS).

Glendora Emergency Alert
Program
The Glendora Emergency Alert system enables the City to provide community members with critical information quickly in a variety of situations, such as severe weather, unexpected road closures, missing persons, and evacuations of buildings or neighborhoods.

City of Glendora Public Works
Department, Suburban Water
Systems, and City of Azusa
Light & Water Department
Water services in the City are provided by the City of Glendora Public Works Department, Suburban Water Systems, and City of Azusa Light & Water Department. Mitigation actions related to water conservation and hardening of critical facilities specific to water and wastewater will be implemented in coordination with these service providers.

Los Angeles County Sanitation
Districts
Within the Sanitation Districts' service area, there are approximately 9,500 miles of sewers that are owned and operated by the cities and County that are tributary to the Sanitation Districts' wastewater collection system. The Sanitation Districts own, operate, and maintain approximately 1,400 miles of sewers, ranging from 8 to 144 inches in diameter, that convey approximately 500 million gallons per day of wastewater to 11 wastewater treatment plants.

Consolidated Sewer
Maintenance District of Los
Angeles County
The Consolidated Sewer Maintenance District of Los Angeles County (CSMD) system includes over 4,600 miles of sanitary sewers, 155 pump stations, and 4 wastewater treatment plants.

California Department of
Transportation
The California Department of Transportation (Caltrans) has jurisdiction, owns, operates, and maintains several of the roadways/bridges within Glendora. Mitigation actions related to ensuring emergency transportation routes are maintained, repaired, and strengthened will require coordination and implementation by Caltrans.

Southern California Edison Southern California Edison (SCE) provides electrical service to Glendora. These providers own and maintain electrical conveyance infrastructure. Mitigation actions specific to the provision of these services will be implemented in coordination with SCE.

Southern California Gas
Company
Southern California Gas Company (SoCalGas) provides natural gas service to Glendora. SoCalGas owns and maintains natural gas conveyance infrastructure. Mitigation actions specific to the provision of these services will be implemented in coordination with the SoCalGas.

Wireless Facilities A variety of service providers provide communication services within Glendora. Mitigation actions specific to the provision of these Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
services will be implemented in coordination with these service providers.

Partnering Arrangements or
Intergovernmental Agreements
The Glendora Police Department and LACoFD have memorandums of understanding with other fire and law enforcement agencies to provide services in emergency events.

American Red Cross The American Red Cross office in Arcadia serves the San Gabriel/Pomona Valley area. The Red Cross provides both technical and education/outreach support in the implementation of mitigation actions.

Financial
Federal Emergency
Management Agency
FEMA is the federal agency responsible for hazard mitigation, emergency preparedness, and emergency response and recovery activities. It provides guidance to State and local governments on hazard mitigation activities, including best practices and how to comply with federal requirements. FEMA also provides funding for hazard mitigation actions through three grant programs: Hazard Mitigation Grant Program (HMGP), Flood Mitigation Assistance (FMA) Grant, and Building Resilient Infrastructure and Communities (BRIC). The HMGP requires a presidential hazard declaration before funding is available; after a hazard is declared, grant applications can be submitted on a rotating basis. Both BRIC and FMA applications typically open during the fall. Outside of the Hazard Mitigation Assistance Grants, FEMA also administers Preparedness Grants and Resilience Grants that may be applicable to future City projects.

California Governor’s Office of
Emergency Services
Cal OES is responsible for overseeing and coordinating emergency preparedness, response, recovery and homeland security activities within California. Cal OES regularly dispatches team members to join first responders, emergency leaders and those affected by disasters that threaten public safety, to provide information essential to the public. Cal OES can assist in obtaining funding for mitigation actions identified in the plan and providing guidance on future plan updates.

Additionally, Cal OES is responsible for administration and distribution of federal grant funding for the FEMA grant programs listed above.

Emergency Reserve Fund The City maintains an emergency reserve fund for emergency needs in an amount equal to the cost to fund operations for a six-month period.

EOC Activation When the City’s EOC is activated, costs are tracked for eligible reimbursement.

Education & Outreach
Alert LA County Alert LA is an opt-in mass notification program utilized by the County of Los Angeles that allows individuals to receive emergency alerts by text, email and/or phone call. Alert LA County has accessibility features for people with disabilities and others with access and functional needs. This system can be used to implement mitigation actions pertaining to public outreach and dissemination of accurate and timely information during a hazard event.

Community Emergency
Response Team
The Community Emergency Response Team (CERT) program was developed by the Los Angeles County Fire Department to provide basic training in safety and lifesaving skills for the general public.

Upon completion of the course, CERT members can assist others in Glendora Local Hazard Mitigation Plan
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Resources Description of Ability to Support Mitigation
their neighborhood or workplace following an event when professional responders are not immediately available to help. The City also offers a CERT course, at minimum annually, for its residents.

Glendora Police Auxiliary The Glendora Police Auxiliary is group of trained, informed volunteers who could be called upon during emergency situations or in the event of a disaster. The Auxiliary may participate in Special Details which could range from appearances at community events, parades, and check-points or emergency response in times of disaster.

Glendora Police Department;
Community Academy
The Community Academy is an outreach program to demystify the workings of the Glendora Police Department. Participants learn about the various duties and activities of the police department and criminal justice system.

Glendora Safe Schools The Glendora Police Department partners with the Glendora Unified School District, the Charter Oak Unified School District, and the Azusa Unified School District to work together to maintain a safe school environment. In addition to on-site patrols and traffic enforcement, the Police Department communicates and meets regularly with school staff and committees and attends PTA meetings. The Police Department can help to implement mitigation actions through the distribution of information through these communication channels.

Neighborhood Watch Program Neighborhood Watch is a crime prevention program which enlists the active participation of residents in cooperation with law enforcement to reduce crime in their communities. It involves neighbors getting to know each other and working together in a program of mutual assistance. Residents become trained to recognize and report suspicious activities, and can then implement crime prevention techniques such as residential and vehicle security, and personal safety into their neighborhoods.

Los Angeles County Fire
Department Education and
Outreach Programs
The LACoFD hosts a series of education and outreach programs including the Ready! Set! Go! guide, which provides residents with critical information on creating defensible space around their home, retrofitting their home with fire-resistant materials, and preparing them to safely evacuate well ahead of a wildfire; and the Family Instructions for Rapid Escape (F.I.R.E.) guide so families can make their homes F.I.R.E. ready and learn how to safely escape in an emergency event.

Emergency Preparedness
Outreach
Disasters cannot be prevented; however, the community can reduce the effects of disasters before they occur, prepare for what could happen, and improve response and recovery. Several mitigation actions pertain to outreach and information to the community and can be implemented through a variety of programs and events in coordination with the City and other partner agencies and stakeholders.

Police/Fire Community
Awareness Events
Events provide an opportunity to implement mitigation actions specific to educating and informing the community regarding hazards and ways to reduce impacts from the hazards and what to do during an emergency.

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Resources Description of Ability to Support Mitigation
Homeowner Associations Several Homeowners Associations exist in the City of Glendora. The associations can help to implement mitigation actions through the distribution of information to their residents.

City Website, E-Newsletter,
Social Media, Brochures and
Pamphlets
These various forms of communication provide an opportunity to convey information and implement mitigation actions specific to educating and informing the community regarding all hazards and ways to reduce impacts from the hazards.

How can these capabilities be expanded upon and improved to reduce risk? Several mitigation actions provide opportunities to expand upon the City’s capabilities to reduce risk.

Examples of these opportunities include:

Planning/Regulatory: Adopt the LHMP Update into the General Plan Safety Element (Mitigation Action 1). Monitor and update building and fire codes (Mitigation Action 32). Review information from dam inspections and Emergency Action Plans and implement physical improvements as needed (Mitigation Actions 14 and 15). Maintain flood control facilities in coordination with LACFCD (Mitigation Action 20).

Perform mechanical thinning, weed abatement, and other wildfire mitigation activities to reduce wildfire risk (Mitigation Action 30 and 31). Review Wildfire Mitigation Plans prepared by the electric utility provider and coordinate opportunities to implement measures to reduce fire caused by electric infrastructure (Mitigation Action 34).

Administrative/Technical: Work with partners and vulnerable populations to identify opportunities to mitigate impacts (Mitigation Actions 9, 10, and 11). Identify organizations to assist property owners and renters with simple earthquake mitigation activities and small project-based structural improvements (Mitigation Action 22). Provide water conservation resources and strategies to reduce water usage and opportunities for cost savings (Mitigation Actions 17 and 18).

Financial: Funding resources for housing/shelter (Mitigation Action 9) and to mitigate impacts to vulnerable populations (Mitigation Action 11). Funding resources for seismic hazard mitigation activities (Mitigation Action 21, 22, and 23). Funding resources to mitigate potential damages associated with heavy rains or Santa Ana wind events (Mitigation Action 25).

Education/Outreach: Education and dissemination of information aimed at mitigating natural hazards and reducing risk (Mitigation Actions 3, 5, and 6). Education about the dangers of extreme heat, particularly to vulnerable populations (Mitigation Action 27). Outreach and education related to wildfires, including mitigation activities such as home hardening and vegetation management to address wildfire risk (Mitigation Actions 28 and 33).

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5.2 HAZARD MITIGATION OVERVIEW
FEMA’S NATIONAL FLOOD INSURANCE PROGRAM
The National Flood Insurance Program (NFIP) provides affordable insurance to property owners, renters and businesses by encouraging communities to adopt and enforce floodplain management regulations. Participation in the NFIP is optional; however, property owners who live in a non-participating community with flood-prone areas are not able to buy flood insurance through the program. Communities with mapped floodplains cannot receive federal grants or loans for development activities in flood-prone areas and cannot receive federal disaster assistance to repair flood damaged buildings in mapped floodplains if they are not participants of the NFIP.

The City of Glendora is a participant in the NFIP and manages its flood-prone areas through Glendora Municipal Code Chapter 9.58, Floodplain Management, effective 2007. Chapter 9.58 applies to all areas identified as flood-prone within the jurisdiction of the City of Glendora.

Pursuant to Section 9.58.060, Compliance, no structure or land can be constructed, located, extended, converted, or altered without full compliance with the term of this chapter and other applicable regulations.

Glendora Municipal Code Section 9.58.110, Designation of the floodplain administrator, appoints the Director of Public Works as the Floodplain Administrator. Pursuant to Section 9.58.120, Duties and responsibilities of the floodplain administrator, the floodplain administrator reviews all development permit applications to determine permit requirements have been satisfied; all other related State and federal permits have been obtained; and the site is reasonably safe from flooding. The floodplain administrator also obtains, reviews, and utilizes any base flood data available from other federal or State agency or other source. Municipal Code Section 9.58.130, Standards of construction, identifies the required standards of construction in all flood-prone areas, including for all new construction and substantial improvements. Other standards are addressed in Section 9.58.140, Standards for subdivisions or other proposed new development, and Section 9.58.150, Standards for utilities.

As part of the City’s concurrent General Plan Safety Element update, current floodplain information has been incorporated and the goals and policies adequately respond to floodplain conditions within the City to reduce vulnerability to flood hazards. Implementation of LHMP update Mitigation Actions 1, 19, and 20 would continue to assist with compliance. Mitigation Action 1 addresses adoption of the LHMP into the City’s General Plan Safety Element, including any future updates. Mitigation Action 19 encourages property owners to improve drainage on their properties through low-impact development features. Mitigation Action 20 directs the City to maintain flood control facilities, in coordination with LACFCD. Additionally, it should be noted that the City’s General Plan Land Use map identifies where a specific land use is allowed within the City. The Glendora Local Hazard Mitigation Plan
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City’s Utility and Flood Control Right-of-Way (ROW) designation is applied to areas in the City that are developed for utility and flood control use.

HAZARD MITIGATION GOALS
The mitigation goals, presented in Section 1.0, serve as the basis for direction to promote sound public policy designed to protect citizens, critical facilities, infrastructure, private property, and the environment from hazards. The plan’s goals guide the direction of future activities aimed at reducing risk and preventing loss from hazards. The goals also serve as checkpoints as agencies and organizations begin implementing mitigation action items.

The hazard mitigation actions identified below list those activities that the City will use to reduce their risk of potential hazards. These mitigation actions were identified through discussions and collaboration with the LHMP Planning Team. All the mitigation actions that were discussed have been included within the plan. Some of these actions may be eligible for funding through federal and State grant programs and other funding sources as made available to the City. The mitigation actions are intended to address the comprehensive range of identified hazards. Some actions may address risk reduction from multiple hazards.

HAZARD MITIGATION PRIORITIZATION
The Planning Team prioritized the mitigation actions using the following as guidance:
 High Priority: Top organizational priority and is generally a well-detailed project idea. Protects population, resources or properties at high risk. Uses feasible methods, techniques or technology.
 Medium Priority: A good idea that needs more information or is an action that addresses a moderate hazard.
 Low Priority: An idea that needs a lot more information or will take a lot of preliminary action to build support.

Some actions, although possibly in need of more information, were identified as a high priority due to current conditions, the risk of the hazard, and the probability of its occurrence. The Planning Team considered the frequency and severity of the hazard; the vulnerability of the community; the impacts the mitigation action would avoid or reduce; the benefits of the action on the community; the critical facilities that would benefit; the environmental benefits of the action; and the capability of the City and its partner agencies to implement the action.

The Planning Team reviewed the STAPLE/E (Social, Technical, Administrative, Political, Legal, Economic, and Environmental) criteria, as described in Table 5-2, STAPLE/E Review and Selection Criteria, when considering and prioritizing the mitigation actions. This methodology, as Glendora Local Hazard Mitigation Plan
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endorsed by FEMA, requires that social, technical, administrative, political, legal, economic, and environmental factors are considered when reviewing potential actions.

TABLE 5-2: STAPLE/E REVIEW AND SELECTION CRITERIA
STAPLE/E Review Selection Criteria
Social  Is the proposed action socially acceptable to the jurisdiction and surrounding community?
 Are there equity issues involved that would mean that one segment of the jurisdiction and/or community is treated unfairly?  Will the action cause social disruption?
Technical  Will the proposed action work?
 Will it create more problems than it solves?
 Does it solve a problem or only a symptom?
 Is it the most useful action in light of other jurisdiction goals? Administrative  Can the jurisdiction implement the action?  Is there someone to coordinate and lead the effort?
 Is there sufficient funding, staff, and technical support available?  Are there ongoing administrative requirements that need to be met?
Political  Is the action politically acceptable?
 Is there public support both to implement and to maintain the project?
Legal  Is the jurisdiction authorized to implement the proposed action?  Are there legal side effects? Could the activity be construed as a taking?
 Will the jurisdiction be liable for action or lack of action?  Will the activity be challenged?
Economic  What are the costs and benefits of this action?  Do the benefits exceed the costs?
 Are initial, maintenance, and administrative costs considered?  Has funding been secured for the proposed action? If not, what are the potential funding sources (public, nonprofit, and private)?  How will this action affect the fiscal capability of the jurisdiction?  What burden will this action place on the tax base or local economy?
 What are the budget and revenue effects of this activity?  Does the action contribute to other jurisdiction goals?  What benefits will the action provide?
Environmental  How will the action affect the environment?  Will the action need environmental regulatory approvals?  Will it meet local and State regulatory requirements?  Are endangered or threatened species likely to be affected? Glendora Local Hazard Mitigation Plan
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HAZARD MITIGATION BENEFIT-COST REVIEW
FEMA requires local governments to analyze the benefits and costs of a range of mitigation actions that can reduce the effects of each hazard within their communities. Benefit-cost analysis is used in hazard mitigation to show if the benefits to life and property protected through mitigation efforts exceed the cost of the mitigation activity. Conducting benefit-cost analysis for a mitigation activity can assist communities in determining whether a project is worth undertaking now to avoid disaster-related damages later. The analysis is based on calculating the frequency and severity of a hazard, avoiding future damage, and risk.

A hazard mitigation plan must demonstrate that a process was employed which emphasized a review of benefits and costs when prioritizing the mitigation actions. The benefit-cost review must be comprehensive to the extent that it can evaluate the monetary as well as the nonmonetary benefits and costs associated with each action. The benefit-cost review should at least consider the following questions:
 How many people will benefit from the action?
 How large an area is impacted?
 How critical are the facilities that benefit from the action (e.g., which is more beneficial to protect, the fire station or the administrative building)?  Environmentally, does it make sense to do this project for the overall community? These questions were considered to help determine the appropriateness of mitigation actions.

Those actions that did not have adequate benefits were excluded from the list of mitigation actions.

5.3 HAZARD MITIGATION ACTIONS

PREVIOUS HAZARD MITIGATION ACTIONS
The 2015 LHMP identified 27 mitigation actions. The Planning Team has reviewed the mitigation actions and documented their status.

The Planning Team considered the following in their review:
 Is the mitigation action still relevant?
 What steps/actions are you aware of that have been taken to address the specific mitigation action?
Table 5-3, Status of Previous Plan Mitigation Actions, provides a consolidated summary of the status of each action.

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TABLE 5-3: STATUS OF PREVIOUS PLAN HAZARD MITIGATION ACTIONS Mitigation
Reference
Number
2015 Mitigation Action Completed
Removed; No Longer
Necessary or
Feasible
Carried Into Plan
Update Status
MultiHazard #1
Integrate the goals and action items from the City of Glendora Natural Hazard Mitigation Plan into existing regulatory documents and programs, where appropriate.

X
The City implemented this mitigation action. As an ongoing opportunity, this mitigation action will be revised and carried into the plan update.

MultiHazard #2Identify and pursue funding opportunities to develop and implement local and city mitigation activities. X This mitigation action is on-going.

MultiHazard #4
Identify, improve, and sustain collaborative programs focusing on the real estate and insurance industries, public and private sector organizations, and individuals to avoid activity that increases risk to natural hazards.

X
The City continues to conduct education and outreach regarding natural hazards. New mitigation actions related to education and outreach included in the plan update will supersede this mitigation action.

MultiHazard #5
Develop public and private partnerships to foster natural hazard mitigation program coordination and collaboration in City of Glendora.

X
The City continues to do this and the mitigation action is on-going.

MultiHazard #6
Develop inventories of at-risk critical facilities (buildings and infrastructure). X
The Glendora Public Works Department has a Facility Condition Assessment that is continually updated/considered to identify at-risk critical facilities. This mitigation action will be revised and carried into the plan update.

MultiHazard #7
Strengthen emergency services preparedness and response by linking emergency services with natural hazard mitigation programs, and enhancing public education on a regional scale. X The City and partner agencies continue to conduct education and outreach regarding preparedness and response. For instance, the City offers Community Emergency Response Team (CERT) basic training to residents and has hosted a Prepare Fair. This mitigation action will be carried into the plan update.

MultiHazard #8
Develop, enhance, and implement education programs aimed at mitigating natural hazards, and reducing the risk to citizens, public agencies, private property owners, businesses, and schools.

X
The City and partner agencies continue to conduct education and outreach regarding hazard mitigation. For instance, the City hosts a Prepare Fair.

This mitigation action will be carried into the plan update.

MultiHazard #9
Review ordinances that protect natural systems and resources to mitigate for natural hazards for possible enhancements.

X
The City implemented this mitigation action. The City reviews qualifying development projects for compliance with existing ordinances, including the Model Water Efficient Landscaping Ordinance and Storm Water and Runoff Pollution Control Ordinance. Applicable projects are also subject to the California Environmental Quality Act (CEQA), which may include mitigation measures related to natural hazards.

Earthquake
#1
Integrate new earthquake hazard mapping data for the City of Glendora and improve technical analysis of earthquake hazards. X The City implemented this mitigation action through this plan update and the General Plan Safety Element update.

Earthquake
#2
Review, update, and incorporate the Evacuation Routes into appropriate planning documents. X The City implemented this mitigation action through the General Plan Safety Element update.

Earthquake
#3
Identify funding sources for structural and nonstructural retrofitting of City-owned structures that are identified as seismically vulnerable.

X
The City continues to identify funding sources. This mitigation action will be revised and carried into the plan update.

Earthquake
#4
Encourage purchase of earthquake hazard insurance.

X
The City continues to conduct education and outreach regarding seismic hazards. New mitigation actions related to education and outreach included in the plan update will supersede this mitigation action.

Earthquake
#5
Encourage seismic strength evaluations of critical facilities in the City of Glendora to identify vulnerabilities for mitigation of schools and universities, public infrastructure, and critical facilities to meet current seismic standards.

X
Public Works conducts a Facility Condition Assessment that is ongoing to continue to identify at-risk critical facilities. A revised mitigation action related to critical facilities evacuations is included in the plan update and will supersede this mitigation action.

Earthquake
#6
Encourage reduction of nonstructural and structural earthquake hazards in homes, schools, businesses, and government offices. X The City and partner agencies continue to conduct education and outreach related to seismic hazards. A revised mitigation action related to critical facilities evacuations is included in the plan update and will supersede this mitigation action.

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Mitigation
Reference
Number
2015 Mitigation Action Completed
Removed; No Longer
Necessary or
Feasible
Carried Into Plan
Update Status
Flood #4 Develop a storm drain clean out program for areas prone to urban flooding. X LACFCD cleans and maintains a majority of the City’s storm drain system. LACFCD inspects and/or cleans all catch basins annually.

Wildfire #1
Educate agency personnel on federal cost-share and grant programs, Fire Protection Agreements and other related federal programs so the full array of assistance available to local agencies is understood.

X
The City continues to educate staff on grant programs and cooperative agreements. New mitigation actions related to wildfire support programs such as funding and mutual aid included in the plan update will supersede this mitigation action.

Wildfire #2
Encourage development and dissemination of maps relating to the fire hazard to help educate and assist builders and homeowners in being engaged in wildfire mitigation activities and to help guide emergency services during response. X
The California Department of Forestry and Fire Protection (CAL FIRE) prepares and periodically updates wildfire hazard severity maps. The City reviews development projects within designated fire hazard severity zones and continues to conduct education and outreach regarding wildfire hazards. A revised mitigation action related to wildfire hazards education and outreach is included in the plan update and will supersede this mitigation action.

Wildfire #3
Enhance outreach and education programs aimed at mitigating wildfire hazards and reducing or preventing the exposure of citizens, public agencies, private property owners and
businesses to natural hazards.

X
The City and partner agencies continue to conduct education and outreach related to wildfire hazards. This mitigation action will be carried into the plan update.

Wildfire #4
Increase communication, coordination and collaboration between wildland/urban interface property owners, local and county planners and fire prevention crews and officials to address risks, existing mitigation measures and federal assistance programs. X The City reviews development projects within designated fire hazard severity zones and continues to conduct education and outreach regarding wildfire hazards. New development is required to comply with existing regulations to reduce wildfire risk, including the Fire Code. This mitigation action will be carried into the plan update.

Wildfire #5
Encourage implementation of wildfire mitigation activities.

X
Mechanical thinning is regularly conducted as required by law in areas of the City’s responsibility. This mitigation action will be revised and carried into the plan update.

Wildfire #6
Clear trimmings, trees, brush and other debris completely from sites when performing routine maintenance and landscaping to reduce fire risk.

X
These efforts are ongoing with the City’s landscaping and tree maintenance contracts. This mitigation action will be revised and carried into the plan update.

Windstorm
#1
Public Awareness Campaign: To provide public education
materials to City of Glendora residents and all School District staff, parents and age-appropriate students with mitigation materials pertaining to the protection of life and property before, during, and after a windstorm.

X
The City and partner agencies continue to conduct education and outreach related to severe weather, including Santa Ana winds. This mitigation action will be revised and carried into the plan update.

Windstorm
#2
Create local City and utility awareness of tree pruning and Fire Code Sections relevant to wind-resistant utility operations. X This action is not necessary; tree trimming related to the electric grid and infrastructure is handled by the service provider, Southern California Edison.

Windstorm
#3
Encourage Critical City Facilities to purchase and/or test backup power facilities for use during a power failure. Create an equipment testing log to ensure backup power equipment is in working service.

X
The Glendora Police Department tests backup command post. The Glendora Public Works Department tests backup generator for radio communications.

This mitigation action will be revised and carried into the plan update.

Landslide
#2
Public awareness regarding hillside ground cover and erosion control. X
The City and partner agencies continue to conduct education and outreach related to seismic and geologic hazards. This mitigation action will be revised and carried into the plan update.

Dam
Failure #1
Produce Dam Inundation Maps X Inundation maps approved by the Division of Safety of Dams have been prepared for all dams with the potential to inundate portions of Glendora.

Dam
Failure #2
Review Emergency Action Plans (EAP) as they relate to the warning, evacuation, and post-flood actions. X
The Glendora Police Department reviewed Los Angeles County’s EAP’s for Big Dalton and Puddingstone. This mitigation action will be revised and carried into the plan update.

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2025 HAZARD MITIGATION ACTIONS
The hazard mitigation actions identified below list those activities that the City will use to reduce their risk of potential hazards. These mitigation actions were reviewed and updated in the context of the updated hazards and vulnerability assessment, community outreach, discussions and collaboration with the LHMP Planning Team, and review and status of the previous plan’s mitigation actions. All the mitigation actions that were discussed have been included within the plan. Some of these actions may be eligible for funding through federal and State grant programs and other funding sources as made available to the City. The mitigation actions are intended to address the comprehensive range of identified hazards and associated risks and vulnerabilities.

Some actions may address risk reduction from multiple hazards.

The process used to update the hazard mitigation actions for this plan included the following:
 Review of the vulnerability and risk assessment presented in Section 4.0;  Review of the capabilities assessment presented in Subsection 5.1;  Review of the City’s previously approved hazard mitigation plan mitigation actions;  Review of the results of the community survey, and feedback received as part of the community outreach and focus outreach meetings; and
 The Planning Team’s discussion of concerns/issues that need to be addressed to reduce hazards to critical facilities and the community.

Table 5-4, Hazard Mitigation Actions, identifies the mitigation action, hazard(s) it addresses, City Department and/or partner agency/stakeholder responsible for implementation, priority, and the timeline for implementation. The timeline for implementation is defined as follows:
 Ongoing: 1-2 years and ongoing thereafter
 Short-Term: 1 to 2 years
 Medium-Term: 3 years
 Long-Term: 4 to 5 years
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TABLE 5-4: HAZARD MITIGATION ACTIONS
Mitigation
Reference
Number
Mitigation Action Hazard(s) Identified Responsible
Departments
Potential Funding
Sources Priority Timeline
1 The City will incorporate the approved Local Hazard Mitigation Plan into its General Plan Safety Element, including any future updates, to ensure compliance with AB 2140, making the City eligible for additional funding under the California Disaster Assistance Act (CDAA).

Multiple Hazards Community Development
General Fund; FEMA
Building Resilient
Infrastructure and
Communities (BRIC)
High Short-Term
2 Identify and pursue funding opportunities to develop and implement local and city mitigation activities. Multiple Hazards Community Development Staff time/General Fund Medium to High Long-Term 3 Develop public and private partnerships to foster natural hazard mitigation program coordination and collaboration and to enhance outreach and education programs aimed at protection of life and property before, during, and after an event. Multiple Hazards Public Information Officer;
Public Works; Police;
Community Development
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Hazard Mitigation
Grant Program (HMGP)
Low Long-Term
4 Continue to assess and inventory at-risk critical facilities (buildings and infrastructure) through the Facility Condition Assessment. If vulnerabilities or deficiencies are identified, document a retrofit plan, schedule, and funding source.

Multiple Hazards Public Works Staff time/General Fund Low Ongoing 5 Strengthen emergency services preparedness and response by linking emergency services with natural hazard mitigation programs and enhancing public education on a regional scale. Multiple Hazards Community Development; Police; Public Works
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC)
High Long-Term
6 Develop, enhance, and implement education programs aimed at mitigating natural hazards, and reducing the risk to citizens, public agencies, private property owners, businesses, and schools. Multiple Hazards Community Development; Police; Public Works
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC)
High Long-Term
7 Conduct a feasibility assessment of installation of backup energy systems (solar, battery, fuel cell, natural gas generator) at key critical facilities within the City. Maintain an equipment testing log to ensure backup power equipment is in working service.

Multiple Hazards Public Works
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC)
Low Medium-Term
8 At all City-sponsored communitywide events, advertise and inform residents/business owners of the City’s alert notification system and assist people in registering for notifications, if requested.

Multiple Hazards Police Staff Time/General Fund High Ongoing 9 Partner with the County, neighboring cities, and local nonprofits to identify potential housing/shelter opportunities, including funding resources, for vulnerable populations in the event of a hazard resulting in displacement. Multiple Hazards Police, Community
Development
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Hazard Mitigation
Grant Program (HMGP)
Medium to High Medium- to Long-Term
10 Partner with local nonprofits to identify and implement targeted mitigation actions to support vulnerable or underserved populations.

Multiple Hazards
Police, Community
Development
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
LUCI Extreme Heat and
Community Resilience
Program
High Ongoing
11 Partner with the local community and other organizations, such as L.A. CADA, the American Red Cross, religious organizations, nonprofits, and partner agencies to work directly with vulnerable populations (elderly, homeless, low income, special needs, etc.) to Multiple Hazards Police, Public Works,
Community Development
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
High Ongoing
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Mitigation
Reference
Number
Mitigation Action Hazard(s) Identified Responsible
Departments
Potential Funding
Sources Priority Timeline
identify opportunities to mitigate impacts in the event of a natural disaster, including the identification of available resources and how to access and implement those resources.

LUCI Extreme Heat and
Community Resilience
Program
12 Consider developing pre-established contracts/ memorandums of understanding (MOUs) with outside entities to ensure availability of equipment to assist with hazard mitigation.

Multiple Hazards Public Works, Community
Development
Staff Time/General Fund;
LUCI Regional Resilience
Planning and
Implementation Grant
Program
Medium Medium-Term
13 Avoid locating new critical facilities within or immediately adjacent to mapped hazard zones, where feasible. If no feasible alternative exists, integrate best-practices into the development to reduce vulnerability and risk to the maximum extent.

Multiple Hazards Public Works, Community
Development Staff Time/General Fund Medium Ongoing
14 Review Emergency Action Plans (EAP) as they relate to the warning, evacuation, and post-flood actions. Dam/Reservoir Failure Police Staff time/General Fund Medium Ongoing 15 Continue to monitor and review the results of the annual dam inspections conducted by the Division of Safety of Dams. If the inspections determine physical improvements are required, coordinate with the owners to document a plan to implement the necessary improvements, including a schedule and provide assistance to identify opportunities for funding.

Dam/Reservoir Failure Public Works, Community
Development Staff time/General Fund Medium Ongoing
16 Proactively monitor and communicate drought conditions or water conservation warnings issued by State and Federal agencies. Drought Public Works (Water Division) Staff time/General Fund High Ongoing 17 Educate residents and business owners on water conservation, the availability of financial incentives and programs to conserve water and encourage implementation of water-saving measures.

Drought Public Works (Water
Division) Staff time/General Fund Medium Ongoing
18 Continue to offer information and services that reduce water usage, are cost-effective, and provide cost savings for both the property owner and tenants. Water conservation resources can include, but are not limited to, low-cost or free water audits, rebate programs, and pilot programs.

Drought Public Works (Water
Division)
Staff time/General Fund;
California DWR
Watershed Resilience
Program
Medium Ongoing
19 Encourage property owners to improve drainage on their properties through low-impact development features. Flood Public Works Staff Time/General Fund Medium Ongoing 20 In coordination with LACFCD, maintain flood control facilities. Develop and implement a storm drain clean out program for areas prone to urban flooding.

Flood
Public Works, in
coordination with
LACFCD
Staff Time/General Fund Medium Medium-Term
21 Work with owners of critical facilities to ensure facilities are evaluated for seismic safety. If any critical facilities are determined to be seismically vulnerable, work with the owner to identify a plan for implementation of seismic retrofit, including schedule and assist to identify potential funding sources.

Seismic and Geologic
Hazards
Community Development;
Public Works
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Pre-disaster
Mitigation Program (PDM)
Medium Long-Term
22 Coordinate with property owners and other community partners to identify funding and in-kind resources and develop a small projectbased seismic retrofit program to educate and directly assist property owners and renters with simple earthquake mitigation activities to reduce the potential for injury and damage and the strain on City resources during an event. Examples include anchoring bookcases, dressers, and file cabinets, installing latches on drawers and cabinet doors, securing desktop computers and appliances, using flexible Seismic and Geologic
Hazards
Community Development;
Public Works
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Pre-disaster
Mitigation Program (PDM)
High Short-Term
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Mitigation
Reference
Number
Mitigation Action Hazard(s) Identified Responsible
Departments
Potential Funding
Sources Priority Timeline
connections on gas water lines, and securely mounting framed pictures and mirrors.
23 Identify and seek funding opportunities for low- to moderate-income homeowners to identify the need for and to implement seismic retrofit projects.

Seismic and Geologic
Hazards
Community Development;
Public Works
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Pre-disaster
Mitigation Program (PDM)
High Short- to Medium Term
24 Monitor conditions during a high wind event to ensure fallen tree limbs or debris do not block roadways or the storm drain system. Severe Weather Public Works Staff Time/General Fund High Ongoing 25 Coordinate with property owners and other community partners to identify funding and in-kind resources for low- to moderate-income homeowners to implement small project-based structural
improvements to mitigate potential damage associated with heavy rains or Santa Ana wind events. Examples include roof repair/ replacement, rain gutter repair/cleanout, tree trimming/ removal, downspouts, rain barrels, or other drainage improvements.

Severe Weather Community Development;
Public Works
Staff Time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Pre-disaster
Mitigation Program
(PDM); LUCI Adaptation
Planning Grant Program
High Short- to Medium- Term
26 Monitor trees, limbs, and other vegetation near power lines, and promptly inform Southern California Edison of the need for any tree trimming.

Severe Weather Public Works Staff Time/General Fund High Ongoing 27 Provide education, particularly to vulnerable populations, about the dangers of extreme heat and ways to stay safe when extreme heat events occur. Continue to publicize the locations of cooling centers in the community. Explore opportunities to further support vulnerable populations and underserved communities during extreme heat events.

Severe Weather Community Development Staff Time/General Fund High Ongoing 28 Partner with agency partners, including the electric utility provider, to enhance outreach and education programs designed to increase awareness about fires, identify potential vulnerabilities, and implement fire mitigation techniques. Develop communication methods and approaches that include underserved or vulnerable populations, who may be uniquely impacted by wildfire risk.

Wildfire
Community Development,
in coordination with
LACoFD
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC)
High Long-Term
29 Reduce wildfire risks by enforcing fire-related requirements pertaining to evacuation routes, minimum road widths, clearances around structures, and peak load water supply for fire response. Wildfire Community Development,
Public Works, in
coordination with
LACoFD
Staff time/General Fund High Ongoing
30 Perform mechanical thinning, weed abatement, and other wildfire mitigation activities, both independently and in coordination with LACoFD. Wildfire
Public Works, in
coordination with
LACoFD
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC)
High Ongoing
31 Clear trimmings, trees, brush and other debris completely from sites when performing routine maintenance and landscaping to reduce fire risk.

Wildfire
Public Works, in
coordination with
LACoFD
Staff time/General Fund High Ongoing
32 Adopt and enforce the most up-to-date California Building Code and California Fire Code, with local amendments as appropriate. Wildfire Community Development Staff time/General Fund High Ongoing 33 Coordinate with LACoFD to educate homeowners on opportunities for home hardening and vegetation management to address wildfire risk. Wildfire Community Development,
in coordination with
LACoFD
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
High Long-Term
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Mitigation
Reference
Number
Mitigation Action Hazard(s) Identified Responsible
Departments
Potential Funding
Sources Priority Timeline
Communities (BRIC); Cal
OES/CAL FIRE California
Wildfire Mitigation
Program (CWMP)
34 Continue to review Wildfire Mitigation Plans prepared by the electric utility provider and coordinate opportunities to implement measures to reduce fire caused by electric infrastructure.

Wildfire Community Development,
Public Works
Staff time/General Fund;
FEMA Building Resilient
Infrastructure and
Communities (BRIC);
FEMA Pre-disaster
Mitigation Program (PDM)
High Long-Term
Ongoing: 1-2 years and ongoing thereafter
Short-Term: 1 to 2 years
Medium-Term: 3 years
Long-Term: 4 to 5 years
Note: *The Potential Funding Sources column identifies potential grant programs for the City to pursue. No award has been made at this time, and other grant programs may apply.

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Section 6.0 | Plan Maintenance
This section outlines the formal process for maintaining the LHMP as an active and relevant document. It includes a schedule for annual monitoring and evaluation, along with a five-year update cycle, to ensure the City remains eligible for federal and State hazard mitigation funding.

Additionally, the section details how the City will integrate public participation into the plan's maintenance and implementation, and how it will incorporate the mitigation actions outlined in the plan into existing planning mechanisms and programs. The plan’s format also allows for easy updates when new data becomes available, ensuring it remains current and effective.

6.1 METHOD AND SCHEDULE FOR MAINTAINING AND

UPDATING THE PLAN

PURPOSE AND AUTHORITY
Section 201.6.(d)(3) of Title 44 of the Code of Federal Regulations requires that local hazard mitigation plans be reviewed, revised if appropriate, and resubmitted for approval to remain eligible for benefits awarded under the DMA. As described below, monitoring the progress of the mitigation actions will be on-going throughout the five-year period between the adoption of the LHMP and the next update effort. The LHMP Planning Team will meet on an annual basis to monitor the status of the implementation of mitigation actions and develop updates as necessary.

The City intends to update the plan on a five-year cycle from the date of initial plan adoption. It is anticipated that this update process will be initiated 18 months prior to expiration of the existing plan. The cycle may be accelerated to less than five years based on the following triggers:
 A presidential disaster declaration that impacts the City.  A hazard event that causes loss of life.

Under the direction of the City’s Project Management Team, which is comprised of designees from the Police Department and Community Development Department, the LHMP Planning Team (identified in Section 2.0, Planning Process) will be responsible for the on-going maintenance and five-year update of this LHMP. The Police Department designee will take the primary lead in the LHMP maintenance by coordinating maintenance of this plan with the Planning Team, including undertaking the formal review process and updating the plan. Key City departments who should have an active role in maintenance and future updates are identified below.

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6-2 | Page Plan Maintenance
 Police Department
 Community Development
 Public Works
 Risk Management
 Human Resources
In addition to City staff, the following partner agencies, organization, and stakeholders who were invited to and/or participated on the Planning Team during preparation of the plan should be included in the maintenance and future update activities:
 Azusa Pacific University
 City of Azusa
 City of Covina
 City of San Dimas
 Charter Oak Unified School District
 Citrus College
 Emanate Health
 Foothill Gold Line
 Glendora Unified School District
 Los Angeles County Area D Disaster Management
 Los Angeles County Fire
 Los Angeles County Public Works (Flood)
 Pomona Valley Hospital
 Red Cross
 Southern California Edison
 Southern California Gas Company
 St. Lucy’s Priory High School
 U.S. Forest Service
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The composition of the Planning Team may change over time, but key City staff positions, departments, and partner agencies should remain integral to the plan’s ongoing implementation and maintenance. Opportunities to expand the Planning Team should also be considered, particularly by including stakeholders who are outside the core team. This should include community partners, service agencies, and organizations that directly engage with the community, with particular focus on underserved and vulnerable populations.

The Project Management Team, led by designees from the Police Department and Community Development Department, will facilitate the Planning Team meetings and assign tasks related to plan updates, presentations, and coordination with other departments, stakeholder groups, or elected officials. This ensures the plan is communicated and integrated across various sectors of the City.

The Planning Team will be responsible for maintaining, updating, and implementing the plan through their respective departments and agencies. Plan implementation and evaluation will be a shared responsibility among all team members, requiring close coordination to ensure that the goals and strategies outlined in the plan are effectively achieved.

ANNUAL PLAN MONITORING AND MAINTENANCE
It will be important to monitor the progress of the mitigation actions throughout the five-year period between adoption and the next required update. At a minimum, designees from the Police Department and Community Development Department, representatives from each City Department, and Planning Team members should meet annually to monitor implementation of the LHMP. However, in the event a significant disaster occurs within Glendora, the Police Department designee, Community Development Department designee, and City Department representatives will convene within 30 days of the disaster to review and update the LHMP as needed. In addition to City staff, partner agencies, organizations, and stakeholders, may be identified for participation, as appropriate.

Designees from the Police Department and Community Development Department will coordinate with responsible City departments and agencies/organizations identified for each mitigation action. These responsible departments and agencies/organizations will monitor and evaluate the progress made on the implementation of mitigation actions and report to the LHMP Planning Team on an annual basis. Working with the LHMP Planning Team, these responsible departments and agencies/organizations will be asked to assess the effectiveness of the mitigation actions and modify the mitigation actions as appropriate. A LHMP Mitigation Action Progress Report worksheet or tracking mechanism will assist departments and agencies/organization responsible for implementing mitigation actions in reporting on the status and assessing the effectiveness of the mitigation actions.

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6-4 | Page Plan Maintenance
Information from the departments and agencies/organizations will be used to monitor mitigation actions and inform the annual evaluation of the LHMP. The following questions will be considered as criteria for evaluating the plan’s effectiveness:
 Has the nature or magnitude of hazards affecting the City changed?  Are there new hazards that have the potential to impact the City?  Do the identified goals and actions address current and expected conditions?  Have mitigation actions been implemented or completed?  Has the implementation of identified mitigation actions resulted in expected outcomes?  Are current resources adequate to implement the LHMP?  Can additional local resources be committed to address identified hazards? As part of the annual meeting, the progress of implementing the mitigation actions will be documented and opportunities to incorporate the actions into other planning documents will be identified. This review will include the following:
 Summary of any hazard events that occurred during the prior year and their impacts on the community.
 Review of successful mitigation initiatives identified in the plan.  Discussion about why targeted mitigation actions were not completed.  Reevaluation of the mitigation actions to determine if the timeline for identified projects needs to be amended (such as changing a long-term project to a short-term project due to funding availability).
 Recommendations for new mitigation actions.
 Changes in, or potential for, new funding options/grant opportunities.  Integration of new data and maps that can be used to inform the plan.  Evaluation of any other planning programs or initiatives within the City that involve hazard mitigation.