Arroyo Grande City Council
June 27, 2023

Section 3.0 System Description
City of Arroyo Grande 3-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

3.0 System Description
This section describes the City’s water system,
service area, population demographics, local
climate, and land uses.

IN THIS S ECTION
• Service Area
• Current and
Projected
Population &
Demographics
• Land Uses

Section 3.0 System Description
City of Arroyo Grande 3-2
Draft 2022 Urban Water
Management Plan
The City is located along the banks of the Arroyo Grande Creek in the County of San Luis Obispo, California. The City is a local public agency charged under the laws of the State of California, as well as its own City policies and regulations, with the duty of supplying and maintaining water service to its customers. The City was incorporated in July 1911.

The City's power and authority is primarily regulated and defined by Division 12, Sections 30000-33901, of the California Water Code. The City's operations are governed by the City Council.

The City has a variety of water sources including groundwater, local surface water, and storm water captured for groundwater recharge, irrigation and construction water.

3.1 General Description
The City's service area is approximately six square miles. Figure 3-1 shows the City’s service area boundary map and surrounding area. The City is located in the County of San Luis Obispo along the Arroyo Grande Creek near the intersection of State Highway 227 and U.S. Highway 101. The City is bordered by the City of Grover Beach to the west, the communities of Oceano and Halcyon to the southwest, Pismo Beach to the northwest and unincorporated portions of the County of San Luis Obispo to the north, northeast, and southeast.

The City's water distribution system has six pressure zones. Water can be distributed between pressure zones as needed. There are 2 booster pump stations that lift water to upper zones to replenish water storage tanks and to supply demand.

The City's existing water storage reservoirs consist of both above ground welded steel and prestressed concrete tanks. The six reservoirs have capacities ranging from 250,000 gallons to

2.0 million gallons (MG) providing 6.7 MG of total system storage.

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Figure 3-1. Vicinity Map

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Figure 3-2. City Service Area

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3.2 Service Area Climate
The climate in the City can be classified as Mediterranean with rains typically occurring from December through March and a relatively low evapotranspiration rate when compared to inland areas due to its location being along the coast. Precipitation data was obtained from the San Luis Obispo County Public Works rain recording station (Arroyo Grande Station # 739) for January 2007 through June 2019 and from the Arroyo Grande Corp Yard Station #177.1 for July 2019 through December 2022. Figure 3-3 shows the annual precipitation for 2007-2022 and illustrates which years fall above or below the annual average precipitation for this period. As shown by this figure, the area can experience multiple years with below average precipitation, making water management critical to ensure the City is prepared for drought.

Climate data was evaluated from the California Irrigation Management Information System (CIMIS), which collects evapotranspiration (ETo) and temperature data. Data was collected from station #202 Nipomo for the period of 2006 to 2020 (CIMIS 2021). Table 3-1 shows the monthly averages for precipitation and ETo.

Figure 3-3. Annual Precipitation Data for Water Years 2007-2022

Section 3.0 System Description
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Management Plan
Table 3-1. Average Monthly Climate Data
MONTH AVERAGE PRECIPITATION (INCHES)1 AVERAGE ETO (INCHES)2 AVERAGE AIR TEMP (°F)2 January 3.3 2.2 52.8
February 2.3 2.5 52.5
March 2.2 3.5 53.9
April 0.7 4.5 54.7
May 0.2 5.0 55.5
June 0.1 4.7 56.4
July 0.1 5.0 58.4
August 0.1 4.4 59.3
September 0.0 3.7 59.7
October 0.8 3.4 60.2
November 1.1 2.4 56.3
December 3.1 1.9 51.9
Average 14.2 42.0 56.0
Notes:
1 Precipitation data was obtained from the San Luis Obispo County Public Works rain recording station (Arroyo Grande Station # 739) for January 2007 through June 2019 and from the Arroyo Grande Corp Yard Station #177.1 for July 2019 through December 2021. 2 Data obtained from CIMIS Station #202 Nipomo from 2006-2020.

3.3 Service Area Population and Demographics
The City of Arroyo Grande’s population has grown from 3,291 in 1960 to 18,441 in 2020 based on US Census data. The City does not serve water to the entire population within its City Limits.

Oceano Community Services District (OCSD) serves 138 connections in the southwestern part of the City. The City also serves 9 connections outside of City Limits. The City’s water service area population in 2020 was 17,641 based on estimates from the California Department of Finance adjusted for customers within and outside of City Limits.

According to the U.S. Census, Arroyo Grande grew 3.62 percent between 2010 to 2019 while Pismo Beach, Grover Beach, the County of San Luis Obispo, and the State of California grew by 7.63%, 2.87%, 3.99%, and 7.18% respectively. The growth that occurred in Arroyo Grande

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from 2010 to 2019 was higher than Grover Beach and comparable to the County, but less than Pismo Beach or the State of California.

The City anticipates an average annual growth rate of approximate 0.39% based on historic growth trends and San Luis Obispo Council of Governments’ (SLOCOG) 2050 Regional Growth Forecast for San Luis Obispo County Population, Housing & Employment (Beacon Economics & SLOCOG Staff June 2017). The SLOCOG 2050 Regional Growth Forecast population projections did not incorporate allocated housing units from the 2019 Regional Housing Needs Allocation (RHNA) Plan for 2019-2028; however, the RHNA Plan indicates that “SLOCOG’s 2050 Regional Growth Forecast population total was reviewed and found comparable to the population forecast for the horizon year developed by [the California State Department of Housing and Community Development (HCD)] and the California Department of Finance” (Governments 2019). Furthermore, the impacts on population from Senate Bill 9, other housing legislation, and related City ordinances and policies are unknown at the time this UWMP was prepared. Therefore, the City’s build-out population of 20,000 people is used in this UWMP as described further in the next section. The City’s current and projected population is shown in Table 3-2.

Table 3-2. Current and Projected Population
2020 2025 2030 2035 2040 2045
City Population 18,441 18,803 19,173 19,550 19,934 20,000 Service Area 17,641 17,988 18,341 18,702 19,069 19,444

3.4 Land Uses within Service Area
The City is largely built-out and is expected to experience only modest growth over the next 20 years. The build-out population, defined as the maximum population that can occur considering the zoning and land use designations in the current General Plan, is established at 20,000 persons. The build-out population may increase if an annexation of approximately 185 acres of land and subsequent development were to occur on a portion of land that lies southeast of the City within the City’s Sphere of Influence and with conversion of irrigated agricultural lands to urban use. The land use development policies within the City are established in the City’s General Plan, principally by the Land Use Element (LUE). The last comprehensive update to the General Plan occurred in October 2001, with the Housing Element updated in 2021.

Existing land uses are shown on Figure 3-4 and existing zoning districts within the City are shown in Figure 3-5 below. Historically, most of the City’s residential growth has occurred on large lots and at low densities. However, it is anticipated that future growth will be redistributed to the City’s mixed-use and higher density residential areas. Based on recent project submittals,

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as well as projected development, the recent and foreseeable trend for new residential development is in the form of higher density, mixed use infill and redevelopment, clustered subdivision, small-lot planned unit development, condominiums, and accessory dwelling units (ADU).

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Figure 3-4. City General Plan Land Use

Section 3.0 System Description
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Management Plan
Figure 3-5. City Zoning Map

Section 4.0 Water Use Characterization
City of Arroyo Grande 4-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

4.0 Water Use Characterization
This section describes and quantifies the City’s
past, current, and projected water uses
through 2045. The City provides potable
water to all its customers, which are
comprised of about 76% residential, 11%
commercial and institutional, and less than 1%
landscape accounts. In 2020, water uses were
about 75% residential, 11% commercial, 11%
landscape and 3.5% losses.

IN THIS S ECTION
• Past and
Current Use
• Projected Water
Demand
• Projected Water
Demand for
Lower Income
Households
• Climate Change
Impacts

Section 4.0 Water Use Characterization
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Management Plan
Accurately tracking and reporting current water demands allow a water supplier to properly analyze the use of its resources and conduct good resource planning.

Estimating future demand as accurately as possible allows water agencies to manage their water supply and appropriately plan their infrastructure investments. Assessments of future growth and related water demand, done in coordination with local planning agencies, provide essential information for developing demand projections. In 2020, the City provided potable water to approximately 6,704 service connections and delivered 2,169 AFY to its customers.

4.1 Past, Current, and Projected Water Use by Sector
The City only provides potable water for residential, commercial and institutional, and landscape uses. Distribution water losses occur between water production and delivery due to various factors and are calculated as the difference between billed consumption and total production.

More information about water losses and annual detailed assessments of water loss using American Water Works Association (AWWA) Water Audit Software are provided in Sections

4.1.2 and 9.5 and Appendix H.

4.1.1 Past and Current Water Use
The past and current water uses presented in Figure 4-1 show the City’s relatively consistent use patterns in the past five years. Past water uses inform an understanding of water use trends which are crucial for developing water use projections.

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Figure 4-1. 2016-2020 Water Uses (AFY)
Table 4-1. Actual Demands for Water
Use Type Additional
Description
Level of Treatment
When Delivered
2020 Volume
(AFY)
Single Family Residential Drinking Water 1,501
Multi-Family Residential Drinking Water 233
Commercial/Institutional Drinking Water 245
Landscape Irrigation Drinking Water 191
Losses Non-Revenue Water Drinking Water 149
Total: 2,319

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4.1.2 Distribution System Losses
Distribution system water losses are the physical potable water losses from the point of water entry to the distribution system to the point of delivery to the customer’s system. Water loss can result from aging infrastructure, leaks, seepage, theft, metering inaccuracies, data handling errors, and other causes. Addressing water losses can increase water supplies and recover revenue. Section 9.1.5 discusses the City’s programs to assess and manage distribution system real loss.

Over the last five years, the City water losses have ranged from 3% to 6%. Detailed assessments of water loss were completed and validated as required since 2015 using American Water Works Association (AWWA) Water Audit Software and are provided in Appendix H and summarized in Table 4-2.

CWC Section 10631 (d)(3)(C) requires water suppliers to provide data to determine if the supplier will meet its State Water Board water loss performance standard. Although the standard has not yet been implemented, the data needs to be included the UWMP. Compliance with the future water loss performance standards will be completed in the next UWMP cycle.

Table 4-2. 12 Month Water Loss Audit Reporting
REPORT PERIOD START DATE VOLUME OF WATER LOSS*

MM YYYY
1 2016 120
1 2017 97
1 2018 74
1 2019 89
1 2020 149
1 Taken from the field "Water Losses" (a combination of apparent losses and real losses) from the AWWA worksheet. 2 Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Table 2-3.

4.1.3 Projected Water Use
Demands were estimated using a Gallons Per Capita Per Day (GCPD) method. The total demand was estimated by multiplying the GPCD by the projected populations for 2025, 2030, 2035, 2040, and 2045. Projected populations are described in Section 3. Table 4-3 and Table 4-4 present projected demands through 2045. These projections are for average year demand, not demand during dry years, or when a Stage 1 Water Shortage Emergency is in effect like it

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has been since 2021. Considerations of near-term demand reductions are described in Section

7.2. Demand projections are based on the assumption that the current GPCD will trend toward the 2020 usage of 117 GPCD by 2025 and stay constant thereafter. Overall, per capita consumption has shown a decreasing trend, which is most likely due to a recession followed by recent multi-year droughts, state and City mandated water use reduction targets, more efficient appliances and plumbing, and conservation efforts made by the City and its customers.

However, the City is aware that future water use standards are under development by DWR, which will supersede current water use efficiency standards, and will likely require demands to be lower than previous standards. Therefore, the City plans to continue encouraging efficient water use and implementing water use efficiency measures to support meeting future water use standards and to enhance resiliency for drought and other water shortage conditions as described in Section 7, Section 8, and Section 9.

Section 4.0 Water Use Characterization
City of Arroyo Grande 4-6
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Table 4-3. Projected Demands for Water
Use Type Additional
Description
Projected Water Use (AFY)
2025 2030 2035 2040 2045
Single Family Residential 1,518 1,548 1,579 1,610 1,641 Multi-Family Residential 249 254 259 264 270
Commercial/Institutional 249 254 259 264 270
Industrial 0 0 0 0 0
Landscape Irrigation 248 253 258 263 268
Sales/Transfers/Exchanges
to other Suppliers
0 0 0 0 0
Losses 99 101 103 105 107
Total: 2,365 2,411 2,458 2,507 2,556
Table 4-4. Total Gross Water Use
2025 2030 2035 2040 2045
Potable Water 2,365 2,411 2,458 2,507 2,556
Recycled Water Demand* 0 200 200 200 200
*Recycled water from Central Coast Blue is injected into the groundwater basin and recovered through groundwater pumping to meet potable demands, which are included in the volumes shown for potable water. It is anticipated the Central Coast Blue supply will be available in 2026. More details about Central Coast Blue are provided in Sections 6.2, 6.5.2.1, and 6.7.4 This table is only provided to meet DWR requirements.

4.1.4 Characteristic Five-Year Water Use
In addition to past and projected uses, the UWMP more closely analyzes anticipated conditions for the next five years (2021 – 2025). Details on an analysis for the next five years are discussed in Section 7.

Section 4.0 Water Use Characterization
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4.3 Water Use for Lower Income Households
Changes to the CWC section 10631.1 since 2005 require demand projections to include projected water use for single-family and multi-family residential housing needed for lower income households. Low-income households are defined as households making less than 80% of the statewide median household income. The Regional Housing Needs Assessment (RHNA) determines the housing needs in each jurisdiction over a given planning period. SLOCOG’s current RHNA planning period is from January 1, 2019, through December 31, 2028. For this planning period, two hundred and seventy-seven (277) new low- and very low-income units are projected to be needed in the City by 2028 (SLOCOG 2019). It is important to note that the RHNA requirement is to have land zoned for the projected low-income housing need but not necessarily build the units. The low-income deliveries projections are included in the City’s total projected water deliveries as part of the GPCD demand projection calculation, as shown in Table 4-5.

Table 4-5. Inclusion in Water Use Projections
Are Future Water Savings Included in Projections?
Refer to Appendix K of UWMP Guidebook.

Yes
Are Lower Income Residential Demands Included in Projections? Yes

4.4 Climate Change Considerations
Consistent future use of groundwater sources may be affected by climate change. “Projections of climate change in California indicate a further intensification of wet and dry extremes and shifting temperatures that can…affect both water use and supplies.

Extreme and higher temperatures can lead to increases in water use…Projections of more frequent, severe, and prolonged droughts could lead to not only less surface water available, but also exacerbating ongoing stressors in groundwater basins across the state” (California Department of Water Resources 2021).

Higher temperatures decrease the amount of precipitation available for groundwater recharge and from surface water sources while increasing water use, especially for outdoor use.

Reductions in future groundwater supply and changes to inflow for Lopez Reservoir due to impacts associated with climate change were considered as part of the projected supply discussed in Section 6 and Section 7. Increases in future water use patterns due to climate change factors were considered as part of the demand projection provided in Section 4.

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Section 5.0 SBX7-7 Baseline, Targets and 2020 Compliance City of Arroyo Grande 5-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

5.0 SBX7-7 Baseline, Targets and
2020 Compliance
This section describes the Water Conservation
Act of 2009, also known as SBX7-7, Baseline,
Targets, and 2020 Compliance. The goal of
this section is to demonstrate compliance with
the 2020 targeted water-use reduction of 20
percent.

IN THIS S ECTION
• SBX7-7 Forms
and Tables

Section 5.0 SBX7-7 Baseline, Targets and 2020 Compliance City of Arroyo Grande 5-2
Draft 2022 Urban Water
Management Plan
SBX7-7 was incorporated into the UWMP Act in 2009 and requires that all water suppliers increase water use efficiency with the overall goal to decrease per-capita water consumption within the state by 20 percent 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 (State of California Department of Water Resources February 2016) 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 following sections. The SBX7-7 Verification and Compliance Forms, which are required to be submitted to DWR to demonstrate compliance with the SBX7-7 requirements, are presented in Appendix F . This section also demonstrates that the City achieved its 2020 water use target.

5.1 SBX7-7 Forms and Tables
The SBX7-7 Verification Form was submitted as part of the City’s 2015 UWMP to establish the baseline and 2020 water use target, which remains valid because there are no changes to the service area. A summary of the SBX7-7 Verification Form is presented in Table 5-1.

The City selected SBX7-7 Method 1, which is defined as a 20 percent reduction of average percapita from the 10-year continuous baseline period. In the City’s case, the calculated 2020 target water use of 153 GPCD was selected. As part of the UWMP, the City must demonstrate compliance with its 2020 water use target by completing SBX7-7 2020 Compliance Form. This form is an abbreviated version of the SBX7-7 Verification Form solely for 2020 compliance calculations. A summary of the 2020 SBX7-7 2020 Compliance Form is shown in Table 5-2.

The City has met the 2020 compliance target and continues to reduce GPCD use overall. The City has consistently met the 2020 SBX7-7 target since 2015 and will continue to work towards reducing GPCD use. A copy of the completed SBX7-7 Forms is included in Appendix F .

Table 5-1. Baselines and Targets Summary
BASELINE PERIOD START YEAR END YEAR AVERAGE BASELINE GPCD* CONFIRMED 2020 TARGET * 10-15 Year 2000 2009 191
153
5 Year 2003 2007 192
*All values are in GPCD.
*All cells in this table are populated manually from the supplier's SBX7-7 Verification Form.

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Table 5-2. 2020 Compliance
ACTUAL
2020
GPCD*
OPTIONAL ADJUSTMENTS TO 2020 GPCD*
2020

CONFIRMED
TARGET
GPCD*

SUPPLIER

ACHIEVED

TARGETED

REDUCTION
IN 2020

EXTRAORDINARY
EVENTS

ECONOMIC

ADJUSTMENT

WEATHER

NORMALIZATION
TOTAL

ADJUSTMENTS
2020 GPCD*
(ADJUSTED IF

APPLICABLE)
117 0 0 0 0 117 117 Yes
*All values are in GPCD.
*All cells in this table are populated manually from the supplier's SBX7-7 Verification Form.

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Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

6.0 Water Supply Characterization
This section describes and quantifies the
current and projected water supplies. Each
water source is characterized with information
needed to manage water resources, assess
supply reliability, perform the Drought Risk
Assessment, and prepare and implement the
WSCP.

IN THIS S ECTION
• Water Supply
Analysis
Overview
• Water Supplies
by Source
• Energy Intensity

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-2
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Management Plan
This section describes the existing and projected water supply sources for the City. The City has a variety of water sources including groundwater, local surface water, and storm water captured for groundwater recharge, irrigation and construction water. A description of the City’s planning efforts for recycled water are also included within this section of the UWMP.

The City’s existing supplies will continue to be used for the planning horizon (2025, 2030, 2035, 2040, and 2045).

6.1 Water Supply Analysis Overview
The City delivers both groundwater and surface water through its pressurized distribution system. The distribution system is composed of 89 miles of distribution mains, six storage reservoirs, and five pumping stations. The City’s well system consists of eight wells, chloramination facilities, and an in-line static mixer for blending of well and surface water. Well No. 9 and No. 10 extract water from the Pismo Formation located outside of the NCMA boundary (described further in Section 6.2.2). Raw water from Well No. 9 and 10 receive treatment prior to entering into the system for iron/manganese and hydrogen sulfide. The City also receives water from the Lopez Project. All City potable water is treated to meet drinking water standards, regardless of the source of supply. Wastewater treatment is conducted by the South San Luis Obispo County Sanitation District (SSLOCSD) at their regional wastewater treatment plant located in Oceano. The City is participating in Central Coast Blue, a recycled water groundwater recharge project, as discussed in Section 6.5.

6.2 Groundwater
The City currently extracts groundwater from the Santa Maria River Valley Groundwater basin (SMGB) and the Pismo Formation, which is separate from the SMGB.

The City’s right to pump groundwater from the SMGB is defined within the Santa Maria Valley Water Conservation District vs. City of Santa Maria, et al. Case No. 770214 Judgment After Trial (Judgment) (Appendix F), which states that the Northern Cities (including the City) have a paramount right to withdraw 4,330 AFY (including Agricultural conversion credits) from the Northern Cities area of the SMGB. The City has an entitlement of 1,323 AFY of groundwater from the SMGB based on the Judgment for the SMGB. Table 6-1 shows the parties and uses that are entitled to a portion of the safe yield of the SMGB, however, recent groundwater modeling indicates that the full NCMA groundwater entitlement may not be pumped by municipal agencies during extended drought conditions without inducing seawater intrusion (Geoscience 2019).

Section 6.0 Water Supply Characterization
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Table 6-1. SMGB Division of Safe Yield
Use Entitlement
Applied Irrigation 4,970
Subsurface Flow to Ocean 200
City of Arroyo Grande1 1,323
City of Grover Beach1 1,407
City of Pismo Beach 700
Oceano CSD 900
TOTAL 9,500
1 Per the 2002 Management Agreement, the Cities of Arroyo Grande and Grover Beach have increased their entitlements by to 121 AFY and 209 AFY respectively based on the conversion of irrigated agricultural lands to urban use.

It is important to note that the City has made and continues to make planning efforts to reduce its reliance on groundwater supplies. In addition, with recent detections of groundwater elevations below sea level and subsequent threat of seawater intrusion, the City realizes the importance of maintaining its groundwater supplies and following a sustainable pumping plan.

Therefore, the City will continue to consider minimizing its impact to groundwater resources.

In an effort to protect the SMGB, the City has partnered with the City of Pismo Beach and City of Grover Beach to design Central Coast Blue, an indirect potable reuse project that will help to recharge the SMGB and protect against seawater intrusion. Central Coast Blue was developed in response to recent droughts that highlighted vulnerabilities in the City’s water supply portfolio and the seawater intrusion risks faced by the SMGB. The Project will improve the reliability of the City’s water supply portfolio by repurposing treated wastewater flows from the Pismo Beach Wastewater Treatment Plant (WWTP), treating the water to drinking water standards, and injecting it into the SMGB. A second phase of Central Coast Blue is being considered which would include treatment of WWTP flows from SSLOCSD in addition to flows from the City of Pismo Beach WWTP. Phase 2 of Central Coast Blue could provide additional water supply for groundwater recharge and seawater intrusion protection. Central Coast Blue will provide a drought-resistant, sustainable local water supply for the City while also improving and protecting the water quality in the SMGB, therefore enhancing the health of the larger watershed. Since the flow of wastewater is typically reliable even during dry years, the City anticipates that it will be able to provide significant enhancement of groundwater supplies and protection of groundwater resources when threatened by drought conditions.

Section 6.0 Water Supply Characterization
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6.2.1 Pismo Formation Basin Description
The Pismo Formation is a distinct deep aquifer at the northeastern section of the City, identified in water wells along Oak Park Boulevard on the south, at Paseo Ladera Lane to the west, and along James Way to the east. Currently, the City pumps groundwater from Well No. 9 and Well No. 10, which are capable of extracting approximately 80 AFY assuming required operational downtime. Both wells receive treatment for iron, manganese and hydrogen sulfide prior to discharge into the system. Well No. 11 is capable of extracting approximately 45 AFY if operated 100% of the time but is assumed to extract 40 AFY assuming required operational downtime. Water supply from the Pismo Formation is not subject to the Judgment of the SMGB.

The Pismo Formation is not adjudicated and has not been identified as over drafted or projected to be over drafted by DWR. In 2003, Cleath & Associates completed a groundwater source assessment for the Oak Park area, which covers the same aquifer as the Pismo Formation. The groundwater yield for the Oak Park area was estimated to be approximately 540 AFY (Cleath & Associates August 2003). The City exercises an appropriative right to put the water supply from the Pismo Formation to reasonable and beneficial use.

6.2.2 Santa Maria Groundwater Basin Description
For planning purposes, DWR has subdivided the State of California into ten separate hydrologic regions, corresponding to the State’s major drainage basins. The SMGB (Number 3-12 as described in DWR Bulletin 118) underlies the Santa Maria Valley in the coastal portion of northern Santa Barbara and southern San Luis Obispo Counties. The SMGB also underlies Nipomo and Tri-Cities Mesa, Arroyo Grande Plain, and Arroyo Grande and Pismo Creek Valleys, of which the City draws from the Tri-Cities Mesa portion of the SMGB. The SMGB is bounded by the San Luis and Santa Lucia Ranges on the north, the San Rafael Mountains on the east, and Solomon Hills and San Antonio Creek Valley Groundwater Basin on the south, and the Pacific Ocean on the west. The SMGB is approximately 288 square miles (184,000 acres). This basin was adjudicated in 2008. A map of the SMGB is shown below as Figure 6-1 Groundwater is found in alluvium, sand dunes, and the Orcutt, Paso Robles, Pismo, and Careaga formations. Groundwater is unconfined throughout most of the SMGB except in the coastal portion where it is confined.

Natural recharge in the basin comes from percolation from major streams, percolation of rainfall, and subsurface flow. Percolation of flow in Arroyo Grande Creek, controlled by releases from Lopez Dam, provides recharge for the Tri-Cities Mesa, Arroyo Grande Plain, and Arroyo Grande Valley portions of the SMGB. Incidental recharge results from deep percolation of urban and agricultural return water, treated wastewater return once Central Coast Blue is active, and septic tank effluent. Some subsurface flow comes from consolidated rocks surrounding the SMGB.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-5
Draft 2022 Urban Water
Management Plan
Figure 6-1. Santa Maria Groundwater Basin Map (GSI Water Solutions April 13, 2022)

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-6
Draft 2022 Urban Water
Management Plan

6.2.2.1 Groundwater Management Plan
The City’s underlying groundwater basin is adjudicated. A copy of the Judgment and the 2002 Management Agreement (Management Agreement), which is what the management of the NCMA in the Judgment was based on, are provided in Appendix F.

As a requirement of the Judgment, the City participates in the NCMA, which is comprised of local entities that have a vested interest in responsibly managing groundwater resources of the NCMA portion of the SMGB. The goal of the NCMA is to help preserve the long-term integrity of water supplies in the NCMA. The NCMA includes joint efforts from the City as well as the City of Pismo Beach, City of Grover Beach, and OCSD (collectively, the Northern Cities).

The Northern Cities and partnered agencies have established six objectives for ongoing NCMA groundwater management, including:
• Share groundwater resources and manage pumping,
• Monitor supply and demand, and share information,
• Manage groundwater levels and prevent seawater intrusion, • Protect groundwater quality,
• Manage cooperatively,
• Encourage water conservation.

NCMA agencies are required by the Judgment to prepare and submit annual reports for the monitoring program, which include collection and analysis of data pertaining to the water supply and demand of the region, including land and water uses in the SMGB, supply sources, and groundwater conditions.

6.2.2.2 Groundwater Levels and Historical Trends
The Northern Cities conduct groundwater monitoring in the NCMA, which represents the northernmost portion of the SMGB. The NCMA groundwater monitoring program utilizes collected data from three primary sources: (1) groundwater elevation data collected by the San Luis Obispo County, (2) water quality and elevation data from a network of sentry wells in the NCMA, and (3) water quality data. The NCMA 2021 Annual Monitoring Report is included in Appendix E for reference, including a boundary map of the NCMA, historic annual precipitation, groundwater elevation contours, and selected hydrographs of NCMA monitoring wells.

Regular monitoring of water elevations in clustered sentry wells located along the coast are monitored quarterly as part of the sentry well monitoring program, which comprises an essential tool for tracking critical groundwater elevation changes. As shown by the hydrographs in Appendix E, the sentry wells provide a long history of groundwater elevations. Measured water elevations in these wells reflect the net effect of changing groundwater recharge and discharge conditions in the primary production aquifer.

Averaging the groundwater elevations from the three deep sentry wells provides a single, representative index, called the deep well index, for tracking the status and apparent health of

Section 6.0 Water Supply Characterization
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the basin. Previous groundwater studies and NCMA Monitoring Annual Reports have suggested a deep well index value of 7.5 feet above MSL as a minimum threshold, below which the basin is at risk for sea water intrusion. Historical variation of this index is represented by the average deep sentry well elevations shown in Figure 6-2.

Figure 6-2. Hydrograph of Deep Well Index Elevation (GSI Water Solutions April 13, 2022) As described in the Northern Cities 2021 Annual Report, groundwater below MSL indicates a potential for seawater intrusion into fresh groundwater supplies. The area with lowest groundwater elevations encompasses municipal well fields and represents a relatively broad and shallow pumping trough exacerbated by drought conditions.

As described in the Northern Cities 2021 Annual Report, in 2021, the deep well index started the year above the 7.5-foot threshold value with an index number in January of more than 9 feet. The index value dropped below the 7.5-foot trigger value by July and continued to fall to a low point of just over 6 feet in late October. A slow recovery occurred through November, followed by a more rapid recovery in December, coincident with the above average monthly rainfall received in December. The index value continued to rise throughout the end of the year and finished 2021 at about 9 feet above sea level.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-8
Draft 2022 Urban Water
Management Plan
Hydrographs produced through the sentry well monitoring program indicate that groundwater elevations have historically varied above and below about 20 feet above MSL. Historical hydrographs show that groundwater elevations recover to levels similar to 2006 (a wet water year) and significantly decline during dry years like 2013. These groundwater level decreases, and recovery cycles illustrate the relationship between times of the drought and increased pumping, and times of recovery with increased rainfall and decreased pumping. The three years of very low rainfall (2013-2015) resulted in water levels throughout the area declining 10 to 20 feet.

6.2.2.3 Threats to Groundwater Supply
A primary concern for the City and for the SMGB in general is seawater intrusion from the coastal zone into fresh groundwater supply. Total groundwater pumping in the NCMA (urban, agriculture, and rural domestic) was 3,344 AF in 2021 which is 35% of the calculated 9,500 AFY safe yield1 of the NCMA portion of the basin. However, even with the reduced pumping, water levels across the aquifer decreased indicating a decrease of groundwater in storage. The net decrease in groundwater levels represented a decrease of groundwater in storage from April 2020 to April 2021 of approximately 1,400 AF (compared to a net decrease of 500 AF during the previous year).

The 2021 NCMA Annual Report describes the following:
“When pumping is less than the safe yield of an aquifer, groundwater in storage should generally increase and result in rising groundwater levels. As such, groundwater elevations throughout the NCMA portion of the SMGB should rise significantly if several consecutive years of groundwater pumping occurs at 30 to 40 percent of the safe yield, which has been the case in the NCMA for the past decade. However, as illustrated by the decline in groundwater levels during 2021, the data show that the aquifer is still in a tenuous position with respect to the threat of seawater intrusion. The fragile health of the aquifer is illustrated by water elevations at just a few feet above sea level, coupled with the formation of a pumping depression in the alluvial aquifer within the Cienega Valley just west of the NCMA/NMMA boundary… The data indicate that the aquifer has little ability to withstand future droughts. Any increase in regional pumping, or any other 1 The calculated, consensus safe yield value of 9,500 AFY for the NCMA portion of the SMGB was included in the 2002 Settlement Agreement through affirmation of the 2001 Groundwater Management Agreement among the NCMA agencies, which is described in more detail in the 2021 NCMA Annual Report Section 1.1.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-9
Draft 2022 Urban Water
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An aerial view of Lopez Lake
changes that reduce recharge from the east will leave the NCMA with a serious groundwater deficit that threatens seawater intrusion.”

6.2.2.4 Past Five Years
As shown in Table 6-2 below, the City has reduced groundwater production since 2016 in an effort to protect the SMGB and allow the deep well index to recover.

Table 6-2. Groundwater Volume Pumped
GROUNDWATER TYPE LOCATION OR BASIN NAME 2016 2017 2018 2019 2020 2021 Alluvial Basin
Santa Maria Groundwater
Basin
165 75 49 81 41 130
Alluvial Basin Pismo Formation 79 59 0 24 36 20
- TOTAL 244 134 49 105 77 150

6.3 Surface Water
The Lopez Project is managed by the
San Luis Obispo County Flood
Control and Water Conservation
District (District). Specifically, the
District manages the Lopez Reservoir
and delivery of Lopez entitlements to
the City and the other Flood Control
and Water Conservation District Zone
3 (Zone 3) members. Zone 3 was
formed to fund operations of the
Lopez Project, which includes Lopez
Lake and Dam, Lopez Terminal
Reservoir, Lopez Water Treatment
Plant and Distribution System. The Lopez Project is considered a very reliable source of water supply. The reservoir’s total capacity is 51,990 AF with a storage capacity of 49,200 AF. The annual safe yield of the reservoir is 8,730 AFY with 4,530 AFY apportioned to Zone 3 contract agencies and the remaining 4,200 AFY reserved for downstream releases to maintain environmental and agricultural flows downstream. In years when less water is required to be released downstream in the Arroyo Grande Creek, additional water (known as surplus water) may be available to the Zone 3 member agencies, which include the Cities of Arroyo Grande,

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-10 Draft 2022 Urban Water
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Grover Beach, Pismo Beach, the OCSD and County Service Area 12 (CSA 12). Table 6-3 shows the contracted entitlements for municipal users of the Lopez Project.

Table 6-3. Lopez Treatment and Distribution System Contract Entitlements Water Contractor Lopez WTP Water Supply Annual Entitlement (AFY)
Arroyo Grande 2,290
Oceano CSD 303
Grover Beach 800
Pismo Beach 896
CSA 12 Total 61
Avila Valley MWC Subtotal 12
San Miguelito MWC Subtotal 0
Avila Beach CSD Subtotal 68
Port San Luis Subtotal 100
Other CSA 12 Customers Subtotal 61
TOTAL 4,530
The supply reliability of the City’s surface water entitlement from Lopez Lake is determined by the District and based on reservoir storage, historical production, and delivery volumes in average, single dry, and consecutive dry year conditions. According to the Zone 3 2020 UWMP, the Lopez Reservoir is a very reliable source of water with an annual safe yield of 8,730 AFY.

The Low Reservoir Response Plan (LRRP) was adopted in December 2014 and initiated in April 2015 and August 2021 due storage being below 20,000 AF. Historical Lopez Lake storage is shown in Figure 6-3. The enactment of Stage 2 of the LRRP results in a 10% decrease in municipal and downstream releases as shown in Table 6-4 and Table 6-5. The Zone 3 2020 UWMP projected that municipal entitlements will remain constant at 4,530 AFY through 2045 during normal years. The Zone 3 2020 UWMP also projected supplying all contracted agencies with their requested entitlements in full during the first three of five consecutive dry years, with a 10% reduction in entitlements during single dry years and the fourth and fifth of five consecutive dry years. However, since the Zone 3 2020 UWMP was developed, storage levels went below 15,000 AF in 2021 and 2022, which resulted in a proactive and voluntary 20% entitlement

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-11 Draft 2022 Urban Water
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reduction in anticipation of storage levels dropping below 10,000 AF. However, the Zone 3 Advisory Committee endorsed an end of LRRP and return to 100% Lopez Entitlements retroactive to April 1, 2022 following significant rainfall in January 2023. Therefore, it is assumed that without Zone 3 contractors’ proactive and voluntary entitlement reduction of 20% in 2022 and the significant amounts of rainfall in January 2023, the reservoir could have been below 10,000 AF, thus requiring a 20% entitlement reduction. See Table 7-6 for the Lopez Lake water year type characterization based on historical conditions and assumptions.

Figure 6-3. Historic Lake Lopez Storage Volume versus LRRP Municipal Diversion Reductions

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Table 6-4. Initial Prescribed Municipal Diversion Reduction Strategy Under the LRRP AMOUNT OF WATER IN STORAGE (AF) MUNICIPAL DIVERSION REDUCTION MUNICIPAL DIVERSION (AFY)1 20,000 0% 4,530
15,000 10% 4,077
10,000 20% 3,624
5,000 35%(2) 2,941
4,000 100% 0
1 The actual amount of water diverted may vary as agencies extend the delivery of their Lopez entitlement. 2 The 35% reduction provides sufficient water to supply 55 gallons per capita per day (gpcd) for the estimated population of the Zone 3 agencies (47,696 in 2010 per the 2010 Zone 3 UWMP). 55 gpcd is the target residential indoor water usage standard used in California Department of Water Resource’s 2010 UWMP Method 4 Guidelines.

Table 6-5. Initial Prescribed Downstream Release Reduction Strategy Under the LRRP AMOUNT OF WATER IN STORAGE (AF) DOWNSTREAM RELEASE REDUCTION DOWNSTREAM RELEASES (AFY)1 20,000 9.5% 3,800
15,000 9.5% 3,800
10,000 75.6% 1,026
5,000 92.9% 300
4,000 100.0% 0
1 These downstream releases represent the maximum amount of water that can be released. Actual releases may be less if releases can be reduced while still meeting the needs of the agricultural stakeholders and addressing the environmental requirements. (Zone December 16, 2014)

6.3.1 Zone 3 Extended Drought Emergency Supply Options Evaluation In late 2015 and early 2016, the Zone 3 member agencies and the District collaborated to identify, evaluate, and develop recommendations for emergency water supply options that could be implemented in the event that the drought occurring at that time continued for an extended period. The City’s 2021 Water Supply Alternatives Update (MKN November 12, 2021) reviewed these recommendations and developed feasible recommendations as described below. These agencies are continuing to monitor drought conditions and plan for the implementation of these emergency measures, should they become necessary.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-13 Draft 2022 Urban Water
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The City’s 2021 Water Supply Alternatives Update, available in Appendix I, reviewed previous supply alternatives and ultimately recommended continued participation in Central Coast Blue and two short-term alternatives, including partnering with OCSD on a short-term water supply agreement and pursuing an emergency connection with Golden State Water Company’s Cypress Ridge system. These supply alternatives are preliminary and do not have associated additional reliable supply volumes identified at this time. See Appendix I for more details.

In 2022, the District set aside 1,000 AF of its stored SWP water for emergency use. In early 2023, it secured the capacity to deliver that water under a separate agreement with the Central Coast Water Authority (CCWA). The County intends to make this water available to local agencies that have established a qualifying need as identified in the District’s draft document, "Proposed Guidelines for Allocation of Emergency State Water Project (SWP) Water," 10/18/2022. For non-SWP Subcontractors (like Arroyo Grande), this water would be made available under a water transfer agreement with the District to specify the terms and conditions and the associated costs.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-14 Draft 2022 Urban Water
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6.4 Stormwater
The City operates and maintains a network of stormwater infiltration, detention and retention basins throughout its service area as shown in Figure 6-4. This stormwater collection system captures or retards runoff mainly for flood control and pollution prevention purposes, but it also recharges the groundwater basin with water that would otherwise ultimately runoff to the Pacific Ocean. The 2020 County of San Luis Obispo Storm Water Resource Plan identifies potential stormwater projects including two proposed by the City for potential funding in the future. The proposed projects for the City include Corbett Creek Floodplain and Stream Restoration and the South Halcyon Green/Complete Street.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-15 Draft 2022 Urban Water
Management Plan
Figure 6-4. Stormwater Basins and Retention Systems

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-16 Draft 2022 Urban Water
Management Plan

6.5 Wastewater and Recycled Water
The UWMP Act requires that the UWMP address the opportunities for development of recycled water, including the description of existing recycled water applications, quantities of wastewater currently being treated to recycled water standards, limitations on the use of available recycled water, an estimate of projected recycled water use, the feasibility of projected uses, and practices to encourage the use of recycled water.

6.5.1 Wastewater Collection, Treatment, and Disposal

6.5.1.1 Wastewater Treatment Facilities
SSLOCSD collects, treats, and disposes of wastewater for the communities of Arroyo Grande, Oceano, and Grover Beach. The SSLOCSD’s Wastewater Treatment Plant (WWTP) treats an average annual daily flow of 2.6 million gallons per day (mgd). Wastewater influent is first passed through an in-channel screen to remove large debris. After debris removal, wastewater flows through two clarifiers and then into a single fixed film reactor for secondary treatment.

Wastewater effluent from the fixed film reactor then flows to secondary clarification to remove any sloughed off bacterial film. Finally, the treated wastewater is disinfected within a chlorine contact chamber with sodium hypochlorite before being discharged to the Ocean. Treated wastewater is discharged through a shared outfall in addition of up to 1.9 mgd of flow from the City of Pismo Beach WWTP.

6.5.1.2 Wastewater Flow Projections
A little less than half of the total flows received at the plant, excluding flows from the Pismo Beach WWTP, are from the City. The future average annual wastewater flow was determined by multiplying the projected population by the average observed unit per capita wastewater generation rate, which is 57 gallons per capita per day (gpcd) (City of Arroyo Grande December 2012). The resulting average annual historical wastewater volumes collected, treated and discharged from the City’s water service area are shown in Table 6-6 and Table 6-7. As shown in Table 6-8, the City did not use any recycled water in 2020 as projected in the 2015 UWMP.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-17 Draft 2022 Urban Water Management Plan Table 6-6. Wastewater Collected within Service Area in 2020 Wastewater Collection Recipient of Collected Wastewater Name of Wastewater
Collection Agency
Wastewater Volume Metered
or Estimated
Wastewater Volume
Collected from UWMP
Service Area in 2020 (AFY)
Name of Wastewater Agency
Receiving Collected
Wastewater
Wastewater Treatment Plant
Name
Wastewater Treatment Plant
Located within UWMP Area
WWTP Operation
Contracted to a Third Party
SSLOCSD Estimated 1,126 SSLOCSD Wastewater Treatment Plant No No Table 6-7. Wastewater Treatment and Discharge within Service Area in 2020 Wastewater
Treatment Plant
Name
Discharge
Location Name or
Identifier
Discharge
Location
Description
Wastewater
Discharge ID
Number
Method of
Disposal
Plant Treats Wastewater
Generated Outside the
Service Area
Treatment
Level
2020 Volumes (AFY)
Wastewater
Treated
Discharged
Treated
Wastewater
Recycled
Within Service
Area
Recycled
Outside of
Service Area
Instream Flow
Permit
Requirement
Wastewater
Treatment Plant
Ocean Outfall Pacific
Ocean
CA0048003 Ocean outfall Yes Secondary,
Disinfected -

2.2 1,126 0 0 0 No
Table 6-8. 2015 UWMP Recycled Water Use Projection Compared to 2020 Actual Use Type 2015 Projection for 2020 2020 Actual Use
Agricultural irrigation 0 0
Landscape irrigation 0 0
Commercial irrigation 0 0
Golf course irrigation 0 0
Wildlife habitat 0 0
Wetlands 0 0
Industrial reuse 0 0
Groundwater recharge 0 0
Seawater barrier 0 0
Geothermal/Energy 0 0
Indirect potable reuse 0 0
Total 0 0

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Section 6.0 Water Supply Characterization
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6.5.2 Potential, Current, and Projected Recycled Water Uses SSLOCSD currently treats its effluent to a secondary level but could treat to a Disinfected Secondary-23 treatment level, as defined by California Code of Regulations Title 22 requirements. Figure 6-5 shows the locations of the Pismo Beach WWTP and the SSLOCSD WWTP.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-19 Draft 2022 Urban Water
Management Plan
Figure 6-5. SSLOCSD and Pismo Beach WWTFs and Outfall

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-20 Draft 2022 Urban Water
Management Plan

6.5.2.1 Actions to Exchange and Optimize Future Recycled Water Use In 2015, the City of Pismo Beach completed the Recycled Water Facilities Planning Study (RWFPS) to investigate alternatives for constructing a recycled water system that will enable the City to produce and beneficially use recycled water to enhance its water supply portfolio. The City of Pismo Beach developed goals and objectives for recycled water through numerous meetings held with potential stakeholders, partner agencies and City staff, considering information presented in prior water supply and recycled water studies, and based on direction given by the Pismo Beach City Council.

The RWFPS alternatives analysis concluded that groundwater recharge is the most favorable alternative. The project has since become known as Central Coast Blue, previously known as the Regional Groundwater Sustainability Project. The RWFPS was adopted by the City Council on April 21, 2015 and was endorsed by all NCMA agencies.

The City of Pismo Beach completed and finalized an Environmental Impact Report in 2021.

Final design began in 2022 for the Advanced Treatment Facility and distributed infrastructure that will facilitate injection of advanced purified water into the groundwater basin. This Indirect Potable Reuse (IPR) project will provide additional recharge for the basin, provide a droughtproof source of supply for the region, and protect the basin from seawater intrusion. The project is planned to be constructed in two phases, with Phase 1 of the project producing an estimated 800 AFY of recycled purified water which will be injected at four injection well sites and Phase 2 producing up to 3,500 AFY injected at 5 sites. Groundwater modeling has indicated that additional yield in excess of the Phase 1 production may be able to be extracted from the basin due to the creation of the seawater intrusion barrier .

In early 2022, the City approved a Cost Sharing Agreement with the cities of Grover Beach and Pismo Beach, which secures an estimated 25%, or 200 AFY, of water from Central Coast Blue to be recovered from the SMGB assuming the project will provide 800 AFY of additional groundwater production potential. In October of 2022 the Central Coast Blue Regional Recycled Water Authority was formed through a Joint Exercise of Powers Agreement by the project partners. Table 6-9 and Table 6-10 show the City’s share of the Central Coast Blue yield from the SMGB once the project is implemented.

Table 6-9. Methods to Expand Future Recycled Water Use

NAME OF ACTION DESCRIPTION

PLANNED

IMPLEMENTATION
YEAR

EXPECTED INCREASE OF

RECYCLED WATER USE
IPR Central Coast Blue - Groundwater
Recharge 2026 200

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Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-21 Draft 2022 Urban Water Management Plan Table 6-10. Recycled Water within Service Area
Name of Supplier Producing (Treating) the Recycled Water: Central Coast Blue Regional Recycled Water Authority Name of Supplier Operating the Recycled Water Distribution System: Central Coast Blue Regional Recycled Water Authority Supplemental Volume of Water Added in 2020: 0
Source of 2020 Supplemental Water: N/A
Beneficial Use Type Potential Beneficial Uses of
Recycled Water
Amount of Potential Uses of
Recycled Water
General Description of 2020
Uses
Level of Treatment 2020 2025 2030 2035 2040 2045
Agricultural irrigation
Landscape irrigation (excludes golf courses)
Golf course irrigation
Commercial use
Industrial use
Geothermal and other energy production
Seawater intrusion barrier
Recreational impoundment
Wetlands or wildlife habitat
Groundwater recharge (IPR)1 Advanced Water Treatment
and Injection Wells
1 Advanced 0 0 200 200 200 200
Reservoir water augmentation (IPR)
Direct potable reuse
Other

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Section 6.0 Water Supply Characterization
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6.6 Desalinated Water Opportunities
The District, in coordination with PG&E, performed an assessment of the feasibility to deliver desalinated water from the Diablo Canyon Power Plant, near Avila Beach, California, to the current Zone 3 member agencies, along the Lopez Pipeline. Preliminary estimates indicate that between 500 AFY to 1,300 AFY could be delivered from the project. Additional analysis regarding this opportunity is on hold due to the tentative closure of the Diablo Canyon Power Plant and PG&E is not considering moving forward with the concept.

The District is developing the Desalination Executable Solution and Logistics Plan (DESAL Plan) to assess various desalination project concepts. The DESAL Plan is anticipated to be available in 2028.

6.7 Water Exchanges and Transfers

6.7.1 Exchanges
The City currently does not exchange water with its neighboring water suppliers. The City is considering partnering with OCSD on a short-term water supply agreement.

6.7.2 Transfers
The City currently does not transfer water with its neighboring water suppliers.

6.7.3 Emergency Interties
The City has an emergency intertie with Grover Beach that allows for the transfer of water during emergency conditions. The City is considering pursuing an emergency connection with Golden State Water Company’s Cypress Ridge system.

6.7.4 Future Water Projects
As discussed in Section 6.5.2, the City of Pismo Beach has initiated design for Phase 1 of Central Coast Blue. This project will provide additional recharge for the SMGB and will provide a drought-proof source of supply for the region. Phase 1 of Central Coast Blue will treat effluent flows from the City of Pismo Beach WWTP. Phase 2 of the project would expand the Advanced Treatment Facility to treat and inject flows from the SSLOCSD WWTP.

As discussed in Section 6.3.1, the City’s 2021 Water Supply Alternatives Update, available in Appendix I, reviewed previous supply alternatives and ultimately recommended continued participation in Central Coast Blue and two short-term alternatives, including partnering with OCSD on a short-term water supply agreement and pursuing an emergency connection with Golden State Water Company’s Cypress Ridge system. These supply alternatives are preliminary and do not have associated additional reliable supply volumes identified at this time.

See Appendix I for more details.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-23 Draft 2022 Urban Water
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In 2022, the District set aside 1,000 AF of its stored SWP water for emergency use. In early 2023, it secured the capacity to deliver that water under a separate agreement with the Central Coast Water Authority (CCWA). The County intends to make this water available to local agencies that have established a qualifying need as identified in the District’s draft document, "Proposed Guidelines for Allocation of Emergency State Water Project (SWP) Water," 10/18/2022. For non-SWP Subcontractors (like Arroyo Grande), this water would be made available under a water transfer agreement with the District to specify the terms and conditions and the associated costs.

6.7.5 Climate Change Effects
As described in Section 4.4, reductions in future groundwater supply due to impacts associated with climate change were considered as part of the projected groundwater supply discussed previously in Section 6 and in Section 7.

Section 6.0 Water Supply Characterization
City of Arroyo Grande 6-24 Draft 2022 Urban Water
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6.8 Energy Intensity
In 2020, the City used 280 kilowatt-hours (kwh) for every Acre-foot (AF) of water produced.

Energy usage includes potable deliveries. A summary of energy used to extract and divert, place into storage, convey, treat, and distribute the City’s supplies for 2020 is provided in Table 6-11.

Table 6-11. Recommended Energy Reporting – Total Utility Approach Urban Water Supplier Operational Control
Start Date for
Reporting Period:
1/1/2020 Sum of All Water
Management Practices
Non-Consequential
Hydropower
End Date for
Reporting Period:
12/31/2020 Total Utility Hydropower Net Utility
Total Volume of Water Entering
Process (AF)
2,319 N/A 2,319
Energy Consumed (kWh) 650,000 N/A 650,000
Energy Intensity (kWh/AF) 280 N/A 280

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Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-1
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2022 URBAN WATER MANAGEMENT PLAN

7.0 Water Service Reliability and
Drought Risk Assessment
This section describes water service reliability
through 2045. As required by the UWMP
Act, the assessment must compare total
projected water supply and demands over
the next 20 years in five-year increments
under normal, single dry water years, and
multiple dry water years. This section also
includes the drought risk assessment (DRA),
which provides a quick snapshot of the
anticipated surplus or deficit if a drought
were to occur in the next five years.

IN THIS S ECTION
• Water Service
Reliability
Assessment
• Drought Risk
Assessment

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-2
Draft 2022 Urban Water
Management Plan
Water service reliability is determined based on security, availability, and dependability of water supplies and water system infrastructure. The supply reliability assessment discusses factors (i.e., climatic, environmental, water quality and legal) that could potentially limit the expected quantity of water available from the City’s current and projected sources of supply through 2045. Multiple drought scenarios are considered and the quantitative impacts of the aforementioned factors on water supply and demand are discussed, as well as possible methods for addressing these issues. Evaluating water service reliability is critical for water management as it can help identify potential problems before these happen. Water managers can then take proactive steps to mitigate shortages by encouraging water use efficiency, securing new water supplies and/or investing in infrastructure.

The City’s UWMP water service reliability assessment and DRA results indicate that supply can meet demand over the next 25-years under normal, single dry water years, and multiple dry water years.

7.1 Water Service Reliability Assessment
The City’s UWMP water service reliability assessment compares total projected water supply and demands over the next 25 years in five-year increments under normal, single dry water year, and five-year consecutive dry period. The approach for the analysis and results are discussed in this section.

7.1.1 Constraints on Water Sources
There are a variety of factors that can impact water supply reliability. Factors impacting the City’s supply sources are indicated as appropriate in Table 7-1. A brief discussion on each of these factors is provided below.

A fundamental factor that affects water supply reliability is the hydraulic capacity of supply and distribution system facilities (e.g., groundwater wells, treatment facilities, transmission mains).

However, as the City continues to grow it will construct the additional supply and distribution system facilities necessary to accommodate the increased water demands associated with this growth. For this reason, the physical capacity of the City’s supply facilities is assumed to not be a limiting factor affecting the reliability of the City’s supply in the future and is not listed in Table 7-1.

Table 7-1. Factors Affecting Water Supply Reliability

WATER SUPPLY SOURCES LEGAL ENVIRONMENTAL WATER QUALITY CLIMATIC Lopez Reservoir X X X X
Groundwater X X X X

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-3
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7.1.1.1 Legal Factors
The legal factors affecting supply reliability apply to the City’s entitlement to groundwater from the SMGB. Since the SMGB is adjudicated, the City is currently entitled to 1,323 AFY of groundwater from the SMGB, as dictated by the Management Agreement and Judgment (Appendix F). The Judgment suggests that the entitled groundwater rights may be decreased in the future if drought and/or overdraft conditions persist. Therefore, if groundwater supplies are limited or reduced in this area, the City’s entitlement may be reduced. Once implemented, Central Coast Blue will help to protect groundwater resources, enhance supply, and minimize the impacts due to possible seawater intrusion.

Additionally, the District is in discussions with the State Water Resources Control Board regarding obtaining an amended water rights permit for its operation of Lopez Reservoir. The current permit only allows for “diversion to storage” and not “direct diversion”. Currently, the Lopez Reservoir utilizes “direct diversion” as part of its normal operations. The District is requesting a time extension on its original permit to allow it to submit its application for an amended permit that would allow for “direct diversion”. However, an amended permit cannot be obtained without a Habitat Conservation Plan (HCP), which is described in the Environmental Factors section below.

The District and the Zone 3 Contractors amended their water supply contracts in 2022 to allow the Contractors to store their unused allocations in Lopez Reservoir in addition to other provisions for storing SWP water. Contract changes are intended to encourage storage of water in the reservoir to improve water supply resiliency. Various related changes to the contracts include:
- Descriptions of what type of water an Agency can put into storage, water put into storage must comply with Article 9, and water in storage is subject to spill losses and Article 4(A) Legally Required Releases
- Changed calculation of Surplus Water to include that undelivered annual entitlement water put into storage is considered delivered water and that stored Lopez water is subject to losses such as spill and evaporation
- Required environmental releases related to a future HCP constitutes as "Legally Required Releases"

7.1.1.2 Environmental Factors
Environmental factors affecting water supply reliability typically include concerns over protection of ecosystems, particularly for fish and wildlife resources. To date, the City’s groundwater supply has not been impacted by any environmental factors.

Surface water from the Lopez Reservoir, managed by the District, is a generally reliable water supply source for the City. However, downstream releases have the potential to be affected by the presence of steelhead trout and the California red-legged frog that utilize the Arroyo Grande Creek watershed downstream of Lopez Dam and are considered threatened species under the

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-4
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Management Plan
Federal Endangered Species Act. The Endangered Species Act permits non-federal entities to obtain incidental take authorization for protected species by developing a Habitat Conservation Plan. The development of a Habitat Conservation Plan and the associated approval of the updated downstream release program is required to allow the District to obtain an amended water rights permit from the State Water Resources Control Board. As of February 2015, the District initiated a new draft of the Habitat Conservation Plan that incorporates an updated model. Current efforts include the development of an integrated surface/groundwater model for the Arroyo Grande Creek Watershed. The updated model will be a key tool to allow Zone 3 and the Contract Agencies to better understand the relationship between downstream release and groundwater pumping on the availability of habitat in lower Arroyo Grande Creek. It is envisioned that the model will allow for the development of a new downstream release program that will be proposed to the environmental regulatory agencies. The updated downstream release program and the Habitat Conservation Plan are intended to provide a plan for the operation of Lopez Reservoir that fulfills the contractual water supply obligations to the Zone 3 contractors and provides releases for downstream agricultural users, and habitat enhancement for steelhead, red-legged frog, and other environmentally sensitive biota in lower Arroyo Grande Creek.

7.1.1.3 Water Quality Factors
The primary water quality factor affecting supply reliability for the City is the threat of seawater intrusion into fresh groundwater aquifers. Under natural and historical conditions, a net outflow of freshwater from the groundwater basin towards the ocean has kept the seawater/freshwater interface from moving onshore. However, the NCMA monitoring event of 2009 indicated coastal groundwater elevations that were below MSL and detect water quality constituents consistent with incipit seawater intrusion. Affected coastal cities (including the City) implemented water conservation methods and reduced groundwater pumping, ultimately resulting in significant recovery of groundwater elevations to above MSL in 2010 and 2011. However, during the extended drought of 2012 - 2016, the groundwater levels in the NCMA sentry wells have dropped to levels similar to those seen in 2009 and have periodically gone below 7.5 MSL since 2016, even with the continued reduced municipal pumping. To further evaluate the continued threat of seawater intrusion, a groundwater model was developed and utilized to evaluate potential future pumping scenarios and their impact on the basin. The results of these scenarios indicate that NCMA agencies may not pump the full groundwater entitlements on a consistent basis without creating the potential for seawater intrusion (Geoscience 2019). To improve water supply reliability for groundwater supplies, the City is participating in development of Central Coast Blue, an indirect potable reuse project that will create a seawater intrusion barrier through injection of advanced purified wastewater.

The City is required by the Safe Drinking Water Act to prepare an annual Consumer Confidence Report, which is an annual water quality report. The purpose of the Consumer Confidence Report is to raise customers' awareness of the quality of their drinking water, where there drinking water comes from, what it takes to deliver water to their homes, and the importance of

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-5
Draft 2022 Urban Water
Management Plan
protecting drinking water sources. The City has treated its delivered water to meet state and federal standards.

7.1.1.4 Climatic Factors
Climatic factors affecting the reliability of a given water supply system generally are a function of seasonal precipitation and runoff characteristics. As such, drought conditions pose threats to availability of both surface water and groundwater supplies. The 2021 NCMA Annual Report describes the following impacts of drought:

Extended drought conditions in recent years have contributed to record low water levels in Lopez Lake… the Zone 3 agencies developed and implemented the LRRP in response to reduced water in storage in the lake. The LRRP is intended to reduce municipal diversions and downstream releases as water levels drop to preserve water within the reservoir for an extended drought.

Despite above-average precipitation in 2016, 2017, and 2019 the LRRP has been reactivated in 2021 in response to declining storage in the reservoir. Water from Lopez Lake may be significantly reduced or unavailable to the Zone 3 agencies in the event of prolonged future drought. Without access to water from Lopez Lake, the NCMA agencies and local agriculture stakeholders may be forced to rely more heavily on their groundwater supplies and increase pumping during extended drought conditions, which could result in lowering water levels in the aquifer and an increased threat from seawater intrusion. Moreover, a reduction in downstream releases from the reservoir, as mandated by the LRRP, likely will lead to reduced recharge to the NCMA portion of the SMGB and further contribute to declining groundwater levels. …
Several measures are employed by the NCMA agencies to reduce the potential for seawater intrusion. Specifically, the NCMA agencies have voluntarily reduced coastal groundwater pumping; decreased overall water use via conservation; and initiated plans, studies, and institutional arrangements to secure additional surface water supplies. …
A major initiative that will provide significant protection to the threat of seawater intrusion is the development of Central Coast Blue. (GSI Water Solutions April 13, 2022)

7.1.1.5 Response to Factors
In response to the legal, environmental, water quality, and climatic factors mentioned above that could potentially impact the availability of the City’s existing water supply in the future, the City is participating in development of Central Coast Blue and advocating for continued conservation as described in Sections 7.0 and 9.0. Short-term water shortages due to these factors are addressed through implementation of the City’s Water Shortage Contingency Plan summarized in Section 8.0 and provided in Appendix D
Central Coast Blue will provide a drought-resistant, sustainable local water supply for the City while also improving and protecting the water quality in the SMGB, therefore enhancing the health of the larger watershed. Since the flow of wastewater is typically reliable even during dry years, the City anticipates that it will be able to provide significant enhancement of groundwater supplies and protection of groundwater resources when threatened by drought conditions.

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-6
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7.1.2 Year Type Characterization
Groundwater
The City’s right to pump groundwater from the SMGB is defined within the Judgment (Appendix F), which states that the NCMA agencies (the City included) have a paramount right to withdraw 4,330 AFY (including agricultural conversion credits) from the NCMA Area of the SMGB. The City is entitled to 1,323 AFY of this total, as indicated in the Management Agreement with other water purveyors in the NCMA (Appendix F). The Judgment also states that the court may exercise its equity powers in the condition that the SMGB becomes over drafted. However, there is no current language in the Judgment that stipulates the amount that supply entitlements may be reduced. Recent groundwater model Phase 1B indicates that only 27% of groundwater entitlement can be pumped on a long-term consistent basis by the municipal agencies without potentially inducing seawater intrusion, so this was chosen as the average year supply (Geoscience 2019).

The City continues to make planning efforts to limit its groundwater pumping to within sustainable amounts due to the threat of seawater intrusion. Therefore, as described in Section

6.5.2, the City intends to participate in development of Central Coast Blue to enhance groundwater supply reliability. Central Coast Blue will be supplied with recycled water from the City of Pismo Beach’s WWTP. Since the flow of wastewater is typically reliable even during dry years, the City of Pismo Beach and participating agencies anticipate that Central Coast Blue will be able to provide significant enhancement of groundwater supplies and protection of groundwater resources when threatened by drought conditions. See Table 7-3 for the groundwater water year type characterization. Due to the threat of seawater intrusion, it is assumed that the City will not pump its full entitlement during average year conditions but would have access to full entitlement during drought conditions, if needed. It is additionally assumed that Central Coast Blue will provide additional groundwater protection and supply availability during normal and dry year conditions.

Additionally, the City can pump water from the Pismo Formation. The Pismo Formation is not adjudicated and has not been identified as over drafted or projected to be over drafted by DWR.

The groundwater yield is estimated to be approximately 540 AFY, however the City’s wells only have the capacity to pump approximately 160 AFY from the Pismo Formation.

Lopez Reservoir
The supply reliability of the City’s surface water entitlement from the Lopez Project is determined by the District and based on reservoir storage, historical entitlements in average, single dry year, and consecutive dry year conditions. According to the Zone 3 2020 UWMP, the Lopez Reservoir is a very reliable source of water with an annual safe yield of 8,730 AFY.

However, during extended drought conditions entitlements may be reduced as part of the LRRP. In December 2014, the LRRP was adopted and initiated in 2015 and 2021 when storage reached below 20,000 AF. The enactment of Stage 2 of the LRRP results in a 10% decrease in municipal and downstream releases as shown in Table 6-4 and Table 6-5. The Zone 3 2020

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-7
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UWMP projected that municipal entitlements will remain constant at 4,530 AFY through 2045 during normal years. The Zone 3 2020 UWMP also projected supplying all contracted agencies with their requested entitlements in full during the first three of five consecutive dry years, with a 10% reduction in entitlements during single dry years and the fourth and fifth of five consecutive dry years. However, since the Zone 3 2020 UWMP was developed, storage levels went below 15,000 AF in 2021 and 2022, which resulted in a proactive and voluntary 20% entitlement reduction in anticipation of storage levels dropping below 10,000 AF. However, the Zone 3 Advisory Committee endorsed an end of LRRP and return to 100% Lopez Entitlements retroactive to April 1, 2022 following significant rainfall in January 2023. Therefore, it is assumed that without Zone 3 contractors’ proactive and voluntary entitlement reduction of 20% in 2022 and the significant amounts of rainfall in January 2023, the reservoir could have been below 10,000 AF, thus requiring a 20% entitlement reduction. See Table 7-6 for the Lopez Lake water year type characterization based on historical conditions and assumptions.

In accordance with CWC Section 10635(a), every urban water supplier must provide their expected water service reliability for a normal year, single dry year, and five consecutive dry years for 2025, 2030, 2035, 2040, and optionally 2045.

DWR defines these years as:
• Normal Year: this condition represents 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 assess normal and dry years and provide the basis for water year data, historical groundwater, purchased water, and precipitation were analyzed for 2007-2022, which includes supply reliability and demand changes in wet and dry years. While historical conditions inform the basis for water year data, each supply source has its own unique reliability conditions that will vary from past years’ conditions. The volumes of water available from groundwater and Lopez Lake under average, single dry, and five-year consecutive dry year periods are shown in Table 7-5 and Table 7-6 as the basis of water years for the reliability assessment.

The City's historical groundwater, purchased water, and precipitation were analyzed for 2007- 2022 as shown in Figure 7-1 and Table 7-4. The City reduced groundwater pumping drastically following the 2009 indications of a threat of seawater intrusion. While 2008 is the year closest to average precipitation, 2012 was selected as the normal year with close to average precipitation after seawater intrusion threat detection in 2009. The single dry year is represented by the year 2013 because it reflects the lowest precipitation since 2007. The five-consecutive year drought for all supplies except Lopez Lake are represented by 2012-2016 because it reflects one of the lowest five-year averages of precipitation and it coincides with the Statewide drought period declared by the Governor that required conservation. However, due to unprecedented drought

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-8
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conditions and deliveries reduction from Lopez Lake in 2021 and 2022, the Lopez Lake potential five-consecutive year drought is represented by 2018-2022.

Figure 7-1. Groundwater, Purchased Water and Precipitation 2007-2022

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-9 Draft 2022 Urban Water Management Plan Table 7-2. Groundwater and Purchased Water 2011-2022
Groundwater (AFY) Purchased Water (AFY) Groundwater (% of Total) Purchased Water (% of Total)
2007 1272 2318 35% 65%
2008 1164 2350 33% 67%
2009 879 2377 27% 73%
2010 610 2346 21% 79%
2011 349 2573 12% 88%
2012 330 2692 11% 89%
2013 388 2723 12% 88%
2014 121 2631 4% 96%
2015 87 2152 4% 96%
2016 244 1704 13% 87%
2017 134 2059 6% 94%
2018 49 2163 2% 98%
2019 105 2034 5% 95%
2020 77 2242 3% 97%
2021 153 2158 7% 93%
2022 168 1822 8% 92%

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-10 Draft 2022 Urban Water Management Plan Table 7-3. Basis for Water Year Data (Reliability Assessment): Groundwater - AVAILABLE SUPPLY IF YEAR TYPE REPEATS – SMGB*

AVAILABLE SUPPLY IF YEAR TYPE REPEATS- PISMO

FORMATION
Year Type Base Year Volume Available
Percent of Average
Supply Volume Available
Percent of Average
Supply
Average Year 2012 1,523 100% 160 100%
Single Dry Year 2013 1,523 100% 160 100%
Consecutive Dry Years
1st Year
2012 1,523 100% 160 100%
Consecutive Dry Years
2nd Year
2013 1,523 100% 160 100%
Consecutive Dry Years
3rd Year
2014 1,523 100% 160 100%
Consecutive Dry Years
4th Year
2015 1,523 100% 160 100%
Consecutive Dry Years
5th Year
2016 1,523 100% 160 100%
*Multiple versions of DWR Table 7-1 are being used. This table is displaying the basis of water year for groundwater assuming full entitlement of 1,323 AFY and 200 AFY from Central Coast Blue by 2026. The City will continue to make planning efforts to limit its groundwater pumping to within sustainable amounts due to the threat of seawater intrusion but would have access to full entitlement during drought conditions, if needed.

The City assumes 27% of the City’s SMGB groundwater entitlement (27% x 1,323 AFY = 357 AFY) can be pumped on a long-term basis without potentially inducing seawater intrusion (Geoscience 2019) and 200 AFY will be available from Central Coast Blue by 2026.

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-11 Draft 2022 Urban Water Management Plan Table 7-4. Basis for Water Year Data (Reliability Assessment): Lopez - AVAILABLE SUPPLY IF YEAR TYPE REPEATS
Year Type Base Year Volume Available Percent of Average Supply Average Year 2016
2,290 100%
Single Dry Year 2014
2,290 100%
Consecutive Dry Years 1st Year 2018
2,290 100%
Consecutive Dry Years 2nd Year 2019
2,290 100%
Consecutive Dry Years 3rd Year 2020
2,290 100%
Consecutive Dry Years 4th Year 2021
2,061 90%
Consecutive Dry Years 5th Year 2022
1,832 80%
*Multiple versions of Table 7-1 are being used. This table is displaying the basis of water year for an Average Year and Single Dry Year of Lopez water based on the Zone 3 2020 UWMP (Water Systems Consulting, Inc. September 2021). Due to unprecedented drought conditions and deliveries reduction from Lopez Lake in 2021 and 2022, the Lopez Lake potential five-consecutive year drought is represented by 2018-2022.

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-12 Draft 2022 Urban Water
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7.1.3 Water Service Reliability
Results of the water supply and demand analysis for normal, single dry, and consecutive fiveyear drought are shown in the following sections. The City expects to meet demands under all water year scenarios. However, in order to meet demands, the City will require continued water conservation efforts and is pursuing multiple supply alternatives as discussed in Sections 6.3.1 and 6.7.4 and Appendix I , including:
- Continued participation in Central Coast Blue development - Partnering with OCSD on a short-term water supply agreement - Pursuing an emergency connection with Golden State Water Company’s Cypress Ridge system.

If necessary, the City may increase pumping up to its entitlement amount.

7.1.3.1 Water Service Reliability – Normal Year
Table 7-7 compares the total supply and demand for the 25-year projection under normal (average) conditions. The available supplies during a normal year represent 100% of Pismo Formation production capabilities, 100% Lopez Lake entitlements, 27% of the City’s groundwater entitlement to the NCMA portion of the SMGB, and 200 AFY from Central Coast Blue. Recent SMGB groundwater model Phase 1B indicates that 27% of groundwater entitlement may be pumped on a long-term consistent basis by the municipal agencies without potentially inducing seawater intrusion so this was chosen as the average year supply (Geoscience 2019).

Table 7-5. Normal Year Supply and Demand Comparison
2025 2030 2035 2040 2045
Supply Totals 2,807 3,007 3,007 3,007 3,007
Demand Totals* 2,365 2,411 2,458 2,507 2,556
Difference: 443 596 549 501 451
* See Section 4.1.3 for demand projection methodology

7.1.3.2 Water Service Reliability – Single-Dry Year
Table 7-8 compares the total supply and demand for the 25-year projection under a single dry year. The demands and supplies are expected to be the same as normal year conditions.

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-13 Draft 2022 Urban Water
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Table 7-6. Single Dry Year Supply and Demand Comparison 2025 2030 2035 2040 2045
Supply Totals 2,807 3,007 3,007 3,007 3,007
Demand Totals* 2,365 2,411 2,458 2,507 2,556
Difference: 443 596 549 501 451
* See Section 4.1.3 for demand projection methodology

7.1.3.3 Water Service Reliability – Five Consecutive Dry Years Table 7-9 compares the total supply and demand under consecutive five-year drought conditions for the 25-year planning horizon. Supplies shown assume reductions in Lopez water as shown in Table 7-4. The City will continue to make planning efforts to limit its groundwater pumping to within sustainable amounts due to the threat of seawater intrusion but would have access to full entitlement during drought conditions, if needed. Therefore, the City anticipates keeping groundwater pumping under 557 AFY (357 AFY without Central Coast Blue) in the first three dry years but may increase pumping beyond 27% of its entitlement in the fourth and fifth dry years. It is additionally assumed that Central Coast Blue will provide an additional 200 AFY of groundwater protection and supply availability during normal and dry year conditions starting in 2026. Additionally, the City will continue to promote conservation and is pursuing multiple supply alternatives as discussed in Sections 6.3.1 and 6.7.4 and Appendix I . Additional information regarding the City’s water conservation and water shortage efforts is available in Section 9 and Appendix D. The City’s supplies will meet the projected demands even during consecutive dry years conditions.

Table 7-7. Multiple Dry Years Supply and Demand Comparison 2025 2030 2035 2040 2045
First
Year
Supply Totals 2,807 3,007 3,007 3,007 3,007
Demand Totals 2,365 2,411 2,458 2,507 2,556
Difference: 443 596 549 501 451
Second
Year
Supply Totals 3,007 3,007 3,007 3,007 N/A
Demand Totals 2,374 2,420 2,468 2,516 N/A

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-14 Draft 2022 Urban Water
Management Plan
2025 2030 2035 2040 2045
Difference: 633 587 539 491 N/A
Third
Year
Supply Totals 3,007 3,007 3,007 3,007 N/A
Demand Totals 2,383 2,430 2,478 2,526 N/A
Difference:
624 577 530 481 N/A
Fourth
Year
Supply Totals 2,778 2,778 2,778 2,778 N/A
Demand Totals 2,392 2,439 2,487 2,536 N/A
Difference: 386 339 291 242 N/A
Fifth
Year
Supply Totals 2,549 2,549 2,549 2,549 N/A
Demand Totals 2,402 2,449 2,497 2,546 N/A
Difference: 148 100 52 3 N/A
*N/A values reflect years beyond the UWMP planning horizon of 2045 and are not applicable. If needed in fourth and fifth dry years, the City will use a combination of conservation measures, Water Shortage Contingency Plan response actions (Appendix D ), surplus ("Carry Over" water as designated in the LRRP) or stored Lopez water available from the preceding years, increased groundwater pumping within the City’s entitlement, or other potential supply sources, such as SWP water. The City is pursuing multiple supply alternatives as discussed in Sections 6.3.1 and 6.7.4 and Appendix I .

7.1.4 Descriptions of Management Tools and Options
The City is currently working on implementing Central Coast Blue to create a local and droughtresistant water supply, which bolsters local groundwater reliability by creating a seawater intrusion barrier and enhancing recharge to the groundwater basin. The City is also continuing to promote conservation and is pursuing multiple supply alternatives as discussed in Sections

6.3.1 and 6.7.4 and Appendix I .

7.2 Drought Risk Assessment
New to the UWMP, CWC Section 10635 (b) now requires a drought risk assessment (DRA).

The DRA provides a quick snapshot of the anticipated surplus or deficit if a five-consecutive year drought were to occur in the next five years. The DRA can be modified or updated outside of the UWMP five-year plan cycle, so a description of the data, methodology, and basis for shortage conditions must be included in this UWMP. The DRA evaluates each water supply’s reliability and compares available water supplies and projected demands during a consecutive five-year drought scenario. This short-term analysis can help water suppliers foresee undesired

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-15 Draft 2022 Urban Water
Management Plan
risks, such as upcoming shortages, and provide time to evaluate and implement the necessary response actions needed to mitigate shortages in a less impactful manner to the community and environment.

7.2.1 Data, Methods, and Basis for Water Shortage Condition The DRA builds on the water service reliability analysis from Section 7.1, which incorporated assessment of historical consumption data by customer class, populated from billing records, and historical supply data by source from production reports. Based on this data, historical demand has never exceeded available supply. For this DRA analysis, normal year demand conditions and five-consecutive year drought supply conditions were considered for 2021-2025.

As described in Section 4, demands were estimated using a GPCD method that projected the annual demands based on the assumption that the future GPCD will trend toward the 2020 usage of 117 GPCD by 2025 and stay constant thereafter. An interpolation was completed to estimate the GPCD for 2023-2025 from actual 2021 and 2022 demand. The total demand was estimated by multiplying the GPCD times the projected populations for these years. Future demand could change due to a variety of factors and this UWMP projects demand to proactively develop water resources management strategies for these potential demands. The City is aware that future water use standards are under development by DWR, which will supersede older water use efficiency standards, and will likely require demands to be lower than previous requirements. Therefore, the City plans to continue encouraging and implementing water use efficiency measures to support meeting future water use standards and to enhance resiliency for drought and other water shortage conditions. As described in Section 7.1, supply is reliable under normal, single dry, and consecutive five-year drought.

7.2.2 DRA Individual Water Source Reliability
As described previously, the City is working to make their supply sustainable by promoting continued conservation. To support the City’s supply management and conservation efforts, the City will monitor precipitation, groundwater levels, production capacity, and State standards for efficient water use. More details are provided in the Water Shortage Contingency Plan (WSCP) in Appendix D and WSCP summary in Chapter 8 about how these factors are established, monitored, and used to make water resources management decisions. If certain criteria are met for these factors, shortage response actions from the City’s WSCP may be activated.

7.2.3 Total Water Supply and Use Comparison
On July 13, 2021, the San Luis Obispo County Board of Supervisors declared a local drought emergency and initiated the LRRP on August 24, 2021. Under the LRRP, the City is subject to a 10% reduction in Lopez deliveries, which retroactively applies to the entire year of 2021. The City responded to this shortage by adopting a Stage 1 Water Shortage Emergency through Resolution No. 5119 on October 12, 2021.

The Zone 3 2020 UWMP projected that municipal entitlements will remain constant at 4,530 AFY through 2045 during normal years. The Zone 3 2020 UWMP also projected supplying all

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-16 Draft 2022 Urban Water
Management Plan
contracted agencies with their requested entitlements in full during the first three of five consecutive dry years, with a 10% reduction in entitlements during single dry years and the fourth and fifth of five consecutive dry years. However, since the Zone 3 2020 UWMP was developed, storage levels went below 15,000 AF in 2021 and 2022, which resulted in a proactive and voluntary 20% entitlement reduction in anticipation of storage levels dropping below 10,000 AF. However, the Zone 3 Advisory Committee endorsed an end of LRRP and return to 100% Lopez Entitlements retroactive to April 1, 2022 following significant rainfall in January 2023. Therefore, it is assumed that without Zone 3 contractors’ proactive and voluntary entitlement reduction of 20% in 2022 and the significant amounts of rainfall in January 2023, the reservoir could have been below 10,000 AF, thus requiring a 20% entitlement reduction.

This DRA assumes that 2021-2025 could reflect a consecutive five-year drought period as follows:
• 2021 had shortage conditions historically experienced in the fourth and fifth dry years with a 10% reduction in Lopez deliveries. Actual production volumes are shown. • 2022 had shortage conditions historically experienced in the fourth and fifth dry years with a 10% reduction in Lopez deliveries for a majority of the water year and a voluntary and proactive 20% reduction, however there was a retroactive return to 100% Lopez Entitlements in January 2023 due to significant rainfall. Actual production volumes are shown.
• 2023-2025 are anticipated to have full entitlements of all supply sources. The City will continue to make planning efforts to limit its groundwater pumping to within sustainable amounts due to the threat of seawater intrusion but would have access to full entitlement during drought conditions, if needed. The City assumes 27% of the City’s SMGB groundwater entitlement (27% x 1,323 AFY = 357 AFY) can be pumped on a long-term basis without potentially inducing seawater intrusion (Geoscience 2019).

With 100% Lopez Entitlements and the implementation of continued conservation and pursuing multiple supply alternatives as discussed in Sections 6.3.1 and 6.7.4 and Appendix I , the City anticipates meeting projected demands within the next five years as shown in Table 7-10.

Additional information regarding the City’s water conservation and water shortage efforts is available in Section 9 and Appendix D.

Table 7-8. Five-Year Drought Risk Assessment
2021 Gross Water Use 2,311
Total Supplies 2,311
Surplus/Shortfall without WSCP Action 0
Planned WSCP Actions (Use Reduction and Supply Augmentation) WSCP (Supply Augmentation Benefit) 0
WSCP (Use Reduction Savings Benefit) 0
Revised Surplus/Shortfall 0
Resulting Percent Use Reduction from WSCP Action 0%

Section 7.0 Water Service Reliability and Drought Risk Assessment City of Arroyo Grande 7-17 Draft 2022 Urban Water
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2022 Gross Water Use 1,990
Total Supplies 1,990
Surplus/Shortfall without WSCP Action 0
Planned WSCP Actions (Use Reduction and Supply Augmentation) WSCP (Supply Augmentation Benefit) 0
WSCP (Use Reduction Savings Benefit) 0
Revised Surplus/Shortfall 0
Resulting Percent Use Reduction from WSCP Action 0%
2023 Gross Water Use 2,321
Total Supplies 2,807
Surplus/Shortfall without WSCP Action 486
Planned WSCP Actions (Use Reduction and Supply Augmentation) WSCP (Supply Augmentation Benefit) 0
WSCP (Use Reduction Savings Benefit) 0
Revised Surplus/Shortfall 486
Resulting Percent Use Reduction from WSCP Action 0%
2024 Gross Water Use 2,343
Total Supplies 2,807
Surplus/Shortfall without WSCP Action 465
Planned WSCP Actions (Use Reduction and Supply Augmentation) WSCP (Supply Augmentation Benefit) 0
WSCP (Use Reduction Savings Benefit) 0
Revised Surplus/Shortfall 465
Resulting Percent Use Reduction from WSCP Action 0%
2025 Gross Water Use 2,365
Total Supplies 2,807
Surplus/Shortfall without WSCP Action 443
Planned WSCP Actions (Use Reduction and Supply Augmentation) WSCP (Supply Augmentation Benefit) 0
WSCP (Use Reduction Savings Benefit) 0
Revised Surplus/Shortfall 443
Resulting Percent Use Reduction from WSCP Action 0%

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Section 8.0 Water Shortage Contingency Plan
City of Arroyo Grande 8-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

8.0 Water Shortage Contingency Plan
The WSCP is a detailed plan for how the City
intends to predict and respond to foreseeable
and unforeseeable water shortages. A water
shortage occurs when the water supply is
reduced to a level that cannot support typical
demand at any given time or reduction in
demand is otherwise needed.

IN THIS S ECTION
• Summary of the
WSCP

Section 8.0 Water Shortage Contingency Plan
City of Arroyo Grande 8-2
Draft 2022 Urban Water
Management Plan
The WSCP is used to provide guidance to the City, staff, and the public by identifying anticipated shortages and response actions to allow for efficient management of any water shortage with predictability and accountability. The WSCP is a detailed proposal for how the City intends to act in the case of an actual water shortage condition. The WSCP is not intended to provide absolute direction but rather to provide options to manage water shortages. Official water shortage declarations by the City may include any combination of components described in the WSCP.

Water shortages can be triggered by a hydrologic limitation in supply (i.e., a prolonged period of below normal precipitation), limitations or failure of supply and treatment infrastructure, compliance with State mandates for water use efficiency, or a combination of conditions. Hydrologic or drought limitations tend to develop and abate more slowly, whereas infrastructure failure tends to happen quickly and relatively unpredictably.

Water supplies may be interrupted or reduced significantly in several ways, such as during a drought that limits supplies, an earthquake that damages water delivery or storage facilities, a regional power outage, or a toxic spill that affects water quality. The WSCP is a standalone document that can be modified as needed and is included as Appendix D.

This WSCP describes the following:

Water Supply Reliability Analysis: Summarizes the City’s water supply analysis and reliability and identifies the key issues that may trigger a shortage condition.

Annual Water Supply and Demand Assessment Procedures: Describes the key data inputs, evaluation criteria, and methodology for assessing the system’s reliability for the coming year and the steps to formally declare any water shortage levels and response actions.

Six Standard Shortage Levels: Establishes water shortage levels to clearly identify and prepare for shortages.

Shortage Response Actions: Describes the response actions that may be implemented or considered for each level to reduce gaps between supply and demand as well as minimize social and economic impacts to the community.

Communication Protocols: Describes communication protocols under each level to ensure customers, the public, and local government agencies are informed of shortage conditions and requirements.

Compliance and Enforcement: Defines compliance and enforcement actions available to administer demand reductions.

Legal Authority: Lists the legal documents that grant the City the authority to declare a water shortage and implement and enforce response actions.

Financial Consequences of WSCP Implementation: Describes the anticipated financial impact of implementing water shortage levels and identifies mitigation strategies to offset financial burdens.

Section 8.0 Water Shortage Contingency Plan
City of Arroyo Grande 8-3
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Monitoring and Reporting: Summarizes the monitoring and reporting techniques to evaluate the effectiveness of shortage response actions and overall WSCP implementation. Results are used to determine if shortage response actions should be adjusted.

WSCP Refinement Procedures: Describes the factors that may trigger updates to the WSCP and outlines how to complete an update.

Special Water Features Distinctions: Defines considerations and definitions for water use for decorative features versus pools and spas.

Plan Adoption, Submittal, and Availability: Describes the WSCP adoption process, submittal, and availability after each revision.

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Section 9.0 Demand Management Measures
City of Arroyo Grande 9-1
Draft 2022 Urban Water
Management Plan
2022 URBAN WATER MANAGEMENT PLAN

9.0 Demand Management Measures
This section describes the City’s efforts to
promote water use efficiency, reduce demand
on water supply, and prepare for future
requirements.

IN THIS S ECTION
• Existing
Demand
Management
Measures
• Reporting
Implementation

Section 9.0 Demand Management Measures
City of Arroyo Grande 9-2
Draft 2022 Urban Water
Management Plan
This section describes the water conservation programs that the City has implemented for the past five years, is currently implementing, and plans to implement to continue meeting its SBX7-7 water use target and position for future State mandated water use efficiency standards that are currently under development by DWR. The section of the CWC addressing Demand Management Measures (DMM) was significantly modified in 2014, based on recommendations from the Independent Technical Panel (ITP) to the legislature.

The ITP was formed by DWR to provide information and recommendations to DWR and the Legislature on new DMMs, technologies and approaches to water use efficiency. The ITP recommended, and the legislature enacted, streamlining the requirements from the 14 specific measures reported on in the 2010 UWMP to six more general requirements plus an “other” category for measures agencies implemented in addition to the required elements. The required measures are summarized in Table 9-1 and the following sections.

Table 9-1. Demand Management Measures
Measure
1 Water waste prevention ordinances
2 Metering
3 Conservation pricing
4 Public education and outreach
5 Programs to assess and manage distribution system real loss 6 Water conservation program coordination and staffing
7 Other demand management measures

9.1 Water Waste Prevention Ordinances
According to the DWR 2020 UWMP Guidebook, a water waste ordinance explicitly states the waste of water is to be prohibited. The ordinance may prohibit specific actions that waste water, such as excessive runoff from landscape irrigation, or use of a hose outdoors without a shut off nozzle.

On April 7, 2017, the Governor’s Executive Order B-40-17 rescinded the April 25, 2014 Emergency Proclamation and Executive Orders B-26-14, B-28-14, B29-15, and B-36-15.

However, this order maintained several permanent prohibitions of wasteful practices as outlined in Order B-37-16.

Section 9.0 Demand Management Measures
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In Chapter 13.05 of the City’s Municipal Code (see Appendix D), which adopted water use restrictions consistent with State Water Resource Control Board Emergency Regulations defining mandatory water use prohibitions that are always in effect, which include:

1. All use of water which results in excessive gutter runoff.

2. Use of water for cleaning driveways, patios, parking lots, sidewalks, streets, or other such uses except as necessary to protect public health or safety.

3. Outdoor water use for washing vehicles shall be attended and have hand-controlled watering devices.

4. Limited days and times for outdoor irrigation. Additional requirements may apply as described in Appendix D and the most recently adopted water shortage emergency resolution. Resolution NO. 5119 is the latest adopted resolution at the time this report’s preparation.
o Outdoor irrigation is prohibited between the hours of ten (10) a.m. and four p.m. o Irrigation of private and public landscaping, turf areas and gardens is permitted at even-numbered addresses only on Mondays and Thursdays and at oddnumbered addresses only on Tuesdays and Fridays. No irrigation of private and public landscaping, turf areas and gardens is permitted on Wednesdays.

Irrigation is permitted at all addresses on Saturdays and Sundays however, in all cases customers are directed to use no more water than necessary to maintain landscaping.

5. Emptying and refilling of swimming pools and commercial spas is prohibited except to prevent structural damage and/or to protect public health or safety.

6. Use of potable water for compaction or dust control purposes in construction activities unless specifically approved by the City.

7. Hotel, motel or other commercial lodging establishment shall offer their patrons the option to forego the daily laundering of towels, sheets and linens.

8. Restaurants or other commercial food service establishments shall not serve water except upon the request of a patron.

9.2 Metering
According to the DWR 2020 UWMP Guidebook, an agency that is fully metered must state this fact in the UWMP. If an agency is not yet full metered, it must discuss its plans for becoming fully metered by January 1, 2025 per CWC Section 527.

Currently all City water services are metered and billed based on volume of use. Meter replacements are performed based on a scheduled program for regular maintenance. The City will continue to require that water meters be installed on new service connections and will perform replacements to help optimize its metering program.

9.3 Conservation Pricing
According to the DWR 2020 UWMP Guidebook, retail water agencies need to describe the pricing structure that is used.

Section 9.0 Demand Management Measures
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The City applies variable water service rate structures by customer class. Rates based on volume of use encourage water conservation by customers.

Table 9-2 shows the water bi-monthly base rate and tiered consumption rates for single-family and multifamily customers with a unit defined as 100 cubic feet (HCF or 748 gallons).

Table 9-2. Single-Family & Multifamily Rate Structure
Units Rate
Base Fee ⅝ - $27.83 & ¾ - $30.57
0-10 HCF $4.06
11-22 HCF $4.83
22+ HCF $4.94
Non-residential customers pay a base rate dependent on meter size (Table 9-4) and a uniform rate based on their customer classification and metered consumption. Table 9-3 shows the uniform rate structure based on the customer classification.

Table 9-3. Non-residential Water Rates
Customer Class Rate (uniform)
Business $4.40
Irrigation $4.97
Hydrant $7.92
Wheeling $2.37
Table 9-4. Monthly Base Fees for Meter Size
Meter Size Base Fee
⅝” $27.83
¾” $30.57
1” $38.78

1.5” $49.73
2” $79.83
3” $301.53
4” $383.64
6” $575.23
8” $794.19

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9.4 Public Education and Outreach
In 2014, the City initiated a water conservation public education program in partnership with the City of Pismo Beach. This effort included:
• Conducted a survey of residents to help determine a marketing strategy • Creation and maintenance of a branded website (www.thinkh20now.com) • Creation and maintenance of Facebook and Twitter pages for the campaign • Water conservation pledge
• Broadcast advertising (e.g., Pandora, Regal Cinemas, Cable Channel 20) • Business outreach
• Community outreach
• Press releases
• Event flyers
The public education program has been well received and proved successful, as demonstrated in the reduction in per capita water use. Arroyo Grande and Pismo Beach staff currently maintain the social media accounts.

Finally, the City participates in a San Luis Obispo County regional collaborative to maintain a water wise gardening website (“GardenSoft”). This is a valuable resource to inspire and guide residents to save water outside the home. The customized website includes local garden tours, garden galleries, various plant lists, garden resources, water conservation tips, and watering guides. The website has been in place since 2011.

Along with the City’s joint conservation efforts along with the City of Pismo Beach, the City has also reestablished and allocated $100,000 in the budget for the previously discontinued “Cash for Grass” program. The City’s Cash for Grass Program helps property owners convert waterthirsty grass to a water efficient landscape.

The City holds a water school to enable people who have received a penalty for using more than their allotments under the Stage 1 Water Shortage Declaration to reduce the penalty by $50. The school describes ways to reduce water use and to monitor for leaks, etc.

9.5 Programs to Assess and Manage Distribution System
Real Losses
To ensure water losses are kept to a minimum, the City maintains an on-going program of meter testing and replacement that tracks the age and testing frequency of each City meter. Water for flushing operations and other maintenance procedures is also estimated and recorded. In order to minimize water loss, the City keeps adequate staff on duty to respond quickly to calls on pipe ruptures, leaks, and repairs and locates and utilizes all control/shut-off valves so that leaks can be corrected in a timely manner. Additionally, the City will continue to conduct annual AWWA Water Audits (see Appendix H).

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9.6 Water Conservation Program Coordination and
Staffing Support
Given the overlapping City department concerns and responsibilities related to conservation, the Water Conservation Coordinator role is met by an interdepartmental Drought Team consisting of Public Works, Community Development, and Administrative Services staff to coordinate water use reduction strategies. Efforts include adopting a Water Emergency Ordinance and declaring a Stage 1 Water Shortage Emergency with mandatory water reductions. The Drought Team and Public Works Department also provide monthly status reports to the City Council on water supply and demand.

9.7 Reporting Implementation

9.7.1 Implementation over the Past Five Years
The City is required to provide a narrative description addressing the nature and extent of each DMM implemented from 2016 through 2020.

The water waste prevention ordinance is an ongoing effort. Since the implementation of the water waste prevention ordinance, the City’s GPCD has continued to decrease.

The metering program is ongoing and helps staff identify significant leaks. Water losses have declined from about 6% in 2016 to a four-year average of approximately 3.6% from 2017-2020.

Conservation pricing discourages high water use.

The public education and outreach and the water conservation program are ongoing as described in Section 9.2.4.

The effectiveness of the plumbing retrofit program is summarized in Table 9-5.

Table 9-5: Plumbing Retrofit Program Effectiveness 2016-2020 2016
As of November 29, 2016, the Plumbing Retrofit Program has completed 2,093 single-family homes, 547 apartment units, 241 mobile homes, 243 motel rooms, 9 churches, 7 public facilities, and 154 commercial establishments. A total of 5,188 toilets, 4,172 faucet aerators, 1,891 showerheads and 421 pressure regulators have been installed or replaced. The estimated water consumption reduction is 177 acre-feet per year

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2017
During the month of November, five (5) homes were retrofitted. Nine (9) water conservation certificates were issued in the month of November as well. As of November 30, 2017, the Plumbing Retrofit Program has completed 2,142 single-family homes, 547 apartment units, 245 mobile homes, 260 motel rooms, 10 churches, 7 public facilities, and 165 commercial establishments. A total of .5,330 toilets, 4,195 faucet aerators, 1,927 showerheads and 430 pressure regulators have been installed or replaced. The estimated water consumption reduction is 177 acre-feet per year. 2018
During the month of November, four (4) homes were retrofitted, and twelve (12) water conservation certificates were issued. As of November 30, 2018, the Plumbing Retrofit Program has completed 2,176 single-family homes, 547 apartment units, 246 mobile homes, 260 motel rooms, 10 churches, 7 public facilities, and 167 commercial establishments. A total of 5,411 toilets, 4,213 faucet aerators, 1,952 showerheads and 438 pressure regulators have been installed or replaced. The estimated water consumption reduction is 205 acre-feet per year.
2019
During the month of December, three (3) homes were retrofitted, and four (4) water conservation certificates were issued. As of December 31, 2019, the Plumbing Retrofit Program has completed 2,197 single-family homes, 547 apartment units, 247 mobile homes, 260 motel rooms, 10 churches, 7 public facilities, and 167 commercial establishments. A total of 5,449 toilets, 4,226 faucet aerators, 1,961 showerheads and 444 pressure regulators have been installed or replaced. The estimated water consumption reduction is 205 acre-feet per year.
2020
During the month of December, one (1) home was retrofitted, and fourteen (14) water conservation certificates were issued. As of December 31, 2020, the Plumbing Retrofit Program has completed 2,213 single family homes, 547 apartment units, 247 mobile homes, 260 motel rooms, 10 churches, 7 public facilities, and 167 commercial establishments. The estimated water consumption reduction of all Water Conservation Programs (Plumbing Retrofit Program, Cash for Grass, and Washing Machine Rebates) is 255 acre-feet per year.

9.7.2 Water Use Objectives (Future Requirements)
The City has been consistently below its SBX7-7 water use target since 2014. While the City’s use of 117 GPCD in 2020 was below the SBX7-7 target, the City is aware that future water use standards are under development by DWR, which will supersede SBX7-7 standards, and will likely require demands to be lower than the SBX7-7 target. Therefore, the City plans to continue encouraging efficient water use and implementing water use efficiency measures to support meeting future water use standards and to enhance resiliency for drought and other water shortage conditions.

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References
City of Arroyo Grande REF-1
Draft 2022 Urban Water
Management Plan
References
Beacon Economics & SLOCOG Staff. June 2017. "2050 Regional Growth Forecast for San Luis Obispo County: Population, Housing, and Employment Projections." California Department of Water Resources. 2021. Urban Water Management Plan Guidebook 2020. Sacramento: California Department of Water Resources.

Carollo Engineers. May 2012. "San Luis Obispo County Master Water Report." Carollo Engineers, Inc. September 2011. "City of Pismo Beach 2010 Urban Water Management Plan."
CIMIS. 2021. https://cimis.water.ca.gov/WSNReportCriteria.aspx.

City of Arroyo Grande. December 2012. "Wastewater System Master Plan." Cleath & Associates. August 2003. "Ground Water Source Assessment Los Robles Del Mar Project Pismo Beach."
Fugro Consultants, Inc. April 2016. "Northern Cities Management Area 2015 Annual Montitoring Report."
Geoscience. 2019. "City of Pismo Beach and South San Luis Obispo County Sanitation District Central Coast Blue Phase 1B Hydrogeologic Evaluation."
Geoscience. 2019. "City of Pismo Beach and South San Luis Obispo County Sanitation District Central Coast Blue Phase 1B Hydrogeologic Evaluation."
GSI Water Solutions, Inc. April 13, 2022. "Northern Cities Management Area 2021 Annual Monitoring Report."
MKN. November 12, 2021. "City of Arroyo Grande Water Supply Alternatives Study Update." Resources, California Department of Water. November 1998. "California Water Plan Update Bulletin 160-98."
Resources, California Department of Water. October 2003. "California's Groundwater Bulletin 118 Update 2003."
SLOCOG. 2019. "2019 Regional Housing Needs Allocation Plan." October 2. https://www.dropbox.com/s/stbw4b26apatv3f/_2019%20RHNA%20Plan_adopted_final.p df?dl=0.

State of California Department of Water Resources. February 2016. "Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Use." Water Systems Consulting, Inc. September 2021. "San Luis Obispo County Flood Control and Water Conservation District 2020 Urban Water Management Plan." Western Hydrologics. 2021. Supplemental Contract Change Modeling.

References
City of Arroyo Grande REF-2
Draft 2022 Urban Water
Management Plan
Zone, San Luis Obispo County Flood Control and Water Conservation District. December 16, 2014. "Low Reservoir Response Plan."

DWR Checklist
City of Arroyo Grande A Draft 2022 Urban Water Management Plan A
DWR Checklist

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2020 Guidebook Location Water Code Section Summary as Applies to UWMP Subject 2020 UWMP Location (Optional Column for Agency Review Use)
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 Chapter 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.

Summary Chapter 1, Section 1.2 & Beginning
of Each Chapter
Section 2.2 10620(b) Every person that becomes an urban water supplier shall adopt an urban water management plan within one year after it has become an urban water supplier. Plan Preparation Not Applicable Section 2.6 10620(d)(2)
Coordinate the preparation of its plan with other appropriate agencies in the area, including other water suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable.

Plan Preparation Chapter 2, Section 2.2
Section 2.6.2 10642
Provide supporting documentation that the water 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 Chapter 1, Section 1.3 & Chapter 2,
Section 2.2
Section 2.6, Section 6.1 10631(h) Retail suppliers will include documentation that they have provided their wholesale supplier(s) - if any - with water use projections from that source. System Supplies Chapter 2, Section 2.2 & Appendix B
Section 2.6 10631(h)
Wholesale suppliers will include documentation that they have provided their urban water suppliers with identification and quantification of the existing and planned sources of water available from the wholesale to the urban supplier during various water year types.

System Supplies Not Applicable
Section 3.1 10631(a) Describe the water supplier service area. System Description Chapter 3, Section 3.1 Section 3.3 10631(a) Describe the climate of the service area of the supplier. System Description Chapter 3, Section 3.2 Section 3.4 10631(a) Provide population projections for 2025, 2030, 2035, 2040 and optionally 2045. System Description Chapter 3, Section 3.3 Section 3.4.2 10631(a) Describe other social, economic, and demographic factors affecting the supplier’s water management planning. System Description Chapter 3, Section 3.3 Sections 3.4 and 5.4 10631(a) Indicate the current population of the service area. System Description and Baselines and Targets Chapter 3, Section 3.3
Section 3.5 10631(a) Describe the land uses within the service area. System Description Chapter 3, Section 3.4 Section 4.2 10631(d)(1) Quantify past, current, and projected water use, identifying the uses among water use sectors. System Water Use Chapter 4, Section 4.1 Section 4.2.4 10631(d)(3)(C) Retail suppliers shall provide data to show the distribution loss standards were met. System Water Use Chapter 4, Section 4.1.2 Section 4.2.6 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 Chapter 4, Section 4.1.3 Section 4.2.6 10631(d)(4)(B) Provide citations of codes, standards, ordinances, or plans used to make water use projections. System Water Use Chapter 4, Section 4.1.3 Section 4.3.2.4 10631(d)(3)(A) Report the distribution system water loss for each of the 5 years preceding the plan update. System Water Use Chapter 4, Section 4.1.2 Section 4.4 10631.1(a) Include projected water use needed for lower income housing projected in the service area of the supplier. System Water Use Chapter 4, Section 4.3
Section 4.5 10635(b) Demands under climate change considerations must be included as part of the drought risk assessment. System Water Use Chapter 4, Section 4.4; Chapter 6, Section 6.1.8
Chapter 5 10608.20(e)
Retail suppliers shall provide baseline daily per capita water use, urban water use target, interim urban water use target, and compliance daily per capita water use, along with the bases for determining those estimates, including references to supporting data.

Baselines and Targets Chapter 5, Section 5.1 & Appendix F
Chapter 5 10608.24(a) Retail suppliers shall meet their water use target by December 31, 2020. Baselines and Targets Chapter 5, Section 5.1 & Appendix F
Section 5.1 10608.36
Wholesale suppliers shall include an assessment of present and proposed future measures, programs, and policies to help their retail water suppliers achieve targeted water use reductions.

Baselines and Targets Not Applicable
Section 5.2 10608.24(d)(2)
If the retail supplier adjusts its compliance GPCD using weather normalization, economic adjustment, or extraordinary events, it shall provide the basis for, and data supporting the adjustment.

Baselines and Targets Not Applicable
Section 5.5 10608.22
Retail suppliers’ per capita daily water use reduction shall be no less than 5 percent of base daily per capita water use of the 5 year baseline. This does not apply if the suppliers base GPCD is at or below 100.

Baselines and Targets Chapter 5, Section 5.1 & Appendix F
Section 5.5 and Appendix E 10608.4 Retail suppliers shall report on their compliance in meeting their water use targets. The data shall be reported using a standardized form in the SBX7-7 2020 Compliance Form. Baselines and Targets Chapter 5, Section 5.1 & Appendix F
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. System Supplies Chapter 6, Section 6.1 & Chapter 7 Sections 6.1 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 Chapter 6, & Chapter 7
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 Chapter 6, Section 6.1 Section 6.1.1 10631(b)(3) Describe measures taken to acquire and develop planned sources of water. System Supplies Chapter 6, Section 6.1.7 Section 6.2.8 10631(b) Identify and quantify the existing and planned sources of water available for 2020, 2025, 2030, 2035, 2040 and optionally 2045. System Supplies Chapter 6, Section 6.1.1 Section 6.2 10631(b) Indicate whether groundwater is an existing or planned source of water available to the supplier. System Supplies Chapter 6, Section 6.1.1 Section 6.2.2 10631(b)(4)(A)
Indicate whether a groundwater sustainability plan or groundwater management plan has been adopted by the water supplier or if there is any other specific authorization for groundwater management. Include a copy of the plan or authorization.

System Supplies Chapter 6, Section 6.1.1
Section 6.2.2 10631(b)(4)(B) Describe the groundwater basin. System Supplies Chapter 6, Section 6.1.1 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 Chapter 6, Section 6.1.1 Section 6.2.2.1 10631(b)(4)(B)
For unadjudicated basins, indicate whether or not the department has identified the basin as a high or medium priority. Describe efforts by the supplier to coordinate with sustainability or groundwater agencies to achieve sustainable groundwater conditions.

System Supplies Chapter 6, Section 6.1.1
Section 6.2.2.4 10631(b)(4)(C) Provide a detailed description and analysis of the location, amount, and sufficiency of groundwater pumped by the urban water supplier for the past five years System Supplies Chapter 6, Section 6.1.1 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 Chapter 6, Section 6.1.1 Section 6.2.7 10631(c) Describe the opportunities for exchanges or transfers of water on a short-term or long- term basis. System Supplies Chapter 6, Section 6.1.6
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) Chapter 6, Section 6.1.4
Section 6.2.5 10633(c) Describe the recycled water currently being used in the supplier's service area. System Supplies (Recycled Water) Chapter 6, Section 6.1.4.2
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) Chapter 6, Section 6.1.4.3
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 a description of the actual use of recycled water in comparison to uses previously projected.

System Supplies (Recycled
Water) Chapter 6, Section 6.1.4.3
Section 6.2.5 10633(f) Describe the actions which 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) Chapter 6, Section 6.1.4.3
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) Chapter 6, Section 6.1.4.4
Section 6.2.6 10631(g) Describe desalinated water project opportunities for long-term supply. System Supplies Chapter 6, Section 6.1.5 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) Chapter 6, Section 6.1.6
Section 6.2.8, Section 6.3.7 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 5 consecutive water years.

System Supplies Chapter 6, Section 6.1.7
Section 6.4 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 Chapter 6, Section 6.2
Section 7.2 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 Chapter 7, Section 7.1

Section 7.2.4 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 Chapter 7, Section 7.1
Section 7.3 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 water supplier with the total projected water use over the next 20 years.

Water Supply Reliability
Assessment Chapter 7, Section 7.1
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 Chapter 7, Section 7.2
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 5 consecutive years.

Water Supply Reliability
Assessment Chapter 7, Section 7.2
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 Chapter 7, Section 7.2
Section 7.3 10635(b)(3) Include a comparison of the total water supply sources available to the water supplier with the total projected water use for the drought period.

Water Supply Reliability
Assessment Chapter 7
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 Chapter 7
Chapter 8 10632(a) Provide a water shortage contingency plan (WSCP) with specified elements below. Water Shortage Contingency Planning Chapter 8 & Appendix D
Chapter 8 10632(a)(1) Provide the analysis of water supply reliability (from Chapter 7 of Guidebook) in the WSCP Water Shortage Contingency Planning Appendix D, Section 1.1
Section 8.10 10632(a)(10)
Describe reevaluation and improvement procedures for monitoring and evaluation the water shortage contingency plan to ensure risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented.

Water Shortage Contingency
Planning Appendix D, Section 1.2, 1.9, 1.10
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 Appendix D, Section 1.2
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 Appendix D, Section 1.2
Section 8.3 10632(a)(3)(A)
Define six standard water shortage levels of 10, 20, 30, 40, 50 percent shortage and greater than 50 percent 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 Appendix D, Section 1.3
Section 8.3 10632(a)(3)(B) Suppliers with an existing water shortage contingency plan that uses different water shortage levels must cross reference their categories with the six standard categories.

Water Shortage Contingency
Planning Appendix D, Section 1.3
Section 8.4 10632(a)(4)(A) Suppliers with water shortage contingency plans that align with the defined shortage levels must specify locally appropriate supply augmentation actions.

Water Shortage Contingency
Planning Appendix D, Section 1.4.2
Section 8.4 10632(a)(4)(B) Specify locally appropriate demand reduction actions to adequately respond to shortages. Water Shortage Contingency Planning Appendix D, Section 1.4
Section 8.4 10632(a)(4)(C) Specify locally appropriate operational changes. Water Shortage Contingency Planning Appendix D, Section 1.4.3
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 Appendix D, Section 1.4.4
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 Appendix D, Section 1.4.1
Section 8.4.6 10632.5 The plan shall include a seismic risk assessment and mitigation plan. Water Shortage Contingency Plan Appendix D, Section 1.4.6
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 Appendix D, Section 1.5
Section 8.5 and 8.6 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 Appendix D, Section 1.5
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 Appendix D, Section 1.6
Section 8.7 10632(a)(7)(A) Describe the legal authority that empowers the supplier to enforce shortage response actions. Water Shortage Contingency Planning Appendix D, Section 1.7
Section 8.7 10632(a)(7)(B) Provide a statement that the supplier will declare a water shortage emergency Water Code Chapter 3.

Water Shortage Contingency
Planning Appendix D, Section 1.7
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 Appendix D, Section 1.7
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 Appendix D, Section 1.8
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 Appendix D, Section 1.8
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 Appendix D, Section 1.8
Section 8.9 10632(a)(9)
Retail suppliers must describe the monitoring and reporting requirements and procedures that ensure appropriate data is collected, tracked, and analyzed for purposes of monitoring customer compliance.

Water Shortage Contingency
Planning Appendix D, Section 1.9
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 Appendix D, Section 1.11
Sections 8.12 and 10.4 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.

Plan Adoption, Submittal, and
Implementation
Appendix D, Section 1.12; Chapter
10 Section 8.14 10632(c) Make available the Water Shortage Contingency Plan to customers and any city or county where it provides water within 30 after adopted the plan.

Water Shortage Contingency
Planning
Appendix D, Section 1.12; Chapter
10 Sections 9.1 and 9.3 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 Not Applicable Sections 9.2 and 9.3 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 Chapter 9
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
Chapter 10, Section 10.3; Appendix
D, Section 1.12
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 urban water supplier will be reviewing the plan and considering amendments or changes to the plan. Reported in Table 10-1.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.2
Section 10.4 10621(f) Each urban water supplier shall update and submit its 2020 plan to the department by July 1, 2021.

Plan Adoption, Submittal, and
Implementation
Chapter 10, Section 10.4; Appendix
D, Section 1.12
Sections 10.2.2, 10.3, and 10.5 10642
Provide supporting documentation that the urban water supplier made the plan and contingency plan available for public inspection, published notice of the public hearing, and held a public hearing about the plan and contingency plan.

Plan Adoption, Submittal, and
Implementation
Chapter 10, Section 10.5; Appendix
B
Section 10.2.2 10642 The water 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
Chapter 10, Section 10.2; Appendix
B
Section 10.3.2 10642 Provide supporting documentation that the plan and contingency plan has been adopted as prepared or modified.

Plan Adoption, Submittal, and
Implementation
Chapter 10, Section 10.4; Appendix
D, Section 1.12; Appendix C
Section 10.4 10644(a) Provide supporting documentation that the urban water supplier has submitted this UWMP to the California State Library.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.4
Section 10.4 10644(a)(1) Provide supporting documentation that the urban water supplier has submitted this UWMP to any city or county within which the supplier provides water no later than 30 days after adoption.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.5
Sections 10.4.1 and 10.4.2 10644(a)(2) The plan, or amendments to the plan, submitted to the department shall be submitted electronically.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.4
Section 10.5 10645(a)
Provide supporting documentation that, not later than 30 days after filing a copy of its plan with the department, the supplier has or will make the plan available for public review during normal business hours.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.5
Section 10.5 10645(b)
Provide supporting documentation that, not later than 30 days after filing a copy of its water shortage contingency plan with the department, the supplier has or will make the plan available for public review during normal business hours.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.5

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 Not Applicable
Section 10.7.2 10644(b) If revised, submit a copy of the water shortage contingency plan to DWR within 30 days of adoption.

Plan Adoption, Submittal, and
Implementation Chapter 10, Section 10.6

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Notification & Outreach Materials
City of Arroyo Grande B Draft 2022 Urban Water Management Plan B
Notification & Outreach Materials

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Resolution of Plan Adoption
City of Arroyo Grande C Draft 2022 Urban Water Management Plan C
Resolution of Plan Adoption

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This appendix to be updated upon UWMP finalization.

Water Shortage Contingency Plan
City of Arroyo Grande D Draft 2022 Urban Water Management Plan D
Water Shortage Contingency Plan

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Draft Water
Shortage
Contingency Plan
MAY 2023 CITY OF ARROYO GRANDE

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CITY OF ARROYO GRANDE
Draft Water Shortage
Contingency Plan
MAY 2023
Prepared by Water Systems Consulting, Inc

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Table of Contents
City of Arroyo Grande i
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Contingency Plan

TABLE OF CONTENTS

1.0 Water Shortage Contingency Plan................................................................................... 4

1.1 Water Supply Reliability Analysis...................................................................................... 5

1.2 Annual Water Supply and Demand Assessment............................................................... 6

1.2.1 Key Data Inputs and Evaluation Criteria..................................................................... 6

1.2.2 Annual Assessment Procedures ................................................................................ 8

1.3 Six Standard Water Shortage Levels ................................................................................ 9

1.4 Shortage Response Actions ............................................................................................12

1.4.1 Demand Reduction ...................................................................................................12

1.4.2 Supply Augmentation................................................................................................17

1.4.3 Operational Changes ................................................................................................18

1.4.4 Additional Mandatory Restrictions.............................................................................18

1.4.5 Emergency Response Plan.......................................................................................19

1.4.6 Seismic Risk Assessment and Mitigation Plan ..........................................................20

1.4.7 Shortage Response Action Effectiveness..................................................................20

1.5 Communication Protocols ................................................................................................23

1.6 Compliance and Enforcement..........................................................................................24

1.7 Legal Authorities..............................................................................................................25

1.8 Financial Consequences of WSCP..................................................................................25

1.9 Monitoring and Reporting.................................................................................................26

1.10 WSCP Refinement Procedures......................................................................................26

1.11 Special Water Feature Distinction..................................................................................27

1.12 Plan Adoption, Submittal, and Availability ......................................................................27

1.13 Resources and References ...........................................................................................28 Attachment 1: Municipal Code Chapter 13.07 ...........................................................................29 Attachment 2: 2019 San Luis Obispo County Multi-Jurisdictional Hazard Mitigation Plan .........30 Attachment 3: Adoption Resolution ...........................................................................................31

List of Tables
City of Arroyo Grande ii Draft Water Shortage
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LIST OF TABLES
Table 1-1. Key Data Inputs for the Annual Assessment. ............................................................ 8 Table 1-2. DWR 8-1 Water Shortage Contingency Plan Levels.................................................10 Table 1-3. Water Shortage Contingency – Mandatory Prohibitions ...........................................18 Table 1-4. Estimated Savings by Shortage Level......................................................................21 Table 1-5. DWR 8-3 Demand Reduction Actions ......................................................................22 Table 1-6. Water Shortage Contingency – Penalties and Charges............................................24

Acroynms & Abbreviations
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ACROYNMS & ABBREVIATIONS
2020 UWMP

GUIDEBOOK
Urban Water Management Plan Guidebook
AF Acre Foot
AWIA America’s Water Infrastructure Act
AWWA American Water Works Association
CALWARN California Water/Wastewater Agency Response Network CITY City of Arroyo Grande
CWC California Water Code
DRA Drought Risk Assessment
DWR California Department of Water Resources
ERP Emergency Response Plan
LRRP Low Reservoir Response Plan
NCMA Northern Cities Management Area
NIMS National Incident Management System
RRA Risk and Resilience Assessment
SEMS Standardized Emergency Management System
SMGB Santa Maria Valley Groundwater Basin
SWRCB State Water Resources Control Board
TAC Technical Advisory Committee
UWMP Urban Water Management Plan
WSAB Water Shortage Appeals Board
WSCP Water Shortage Contingency Plan

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1.0 Water Shortage Contingency Plan
This Water Shortage Contingency Plan (WSCP) is a detailed plan for how the City of Arroyo Grande (City) intends to predict and respond to foreseeable and unforeseeable water shortages. A water shortage occurs when the water supply is reduced to a level that cannot support typical demand at any given time or reduction in demand is otherwise needed.

This WSCP is used to provide guidance to the City, staff, and the public by identifying anticipated shortages and response actions to allow for efficient management of any water shortage with predictability and accountability. The WSCP is a detailed proposal for how the City intends to act in the case of an actual water shortage condition. This WSCP is not intended to provide absolute direction but rather to provide options to manage water shortages. Official water shortage declarations by the City may include any combination of components described in this WSCP.

Water shortages can be triggered by a hydrologic limitation in supply (i.e., a prolonged period of below normal precipitation), limitations or failure of supply and treatment infrastructure, compliance with State mandates for water use efficiency, or a combination of conditions.

Hydrologic or drought limitations tend to develop and abate more slowly, whereas infrastructure failure tends to happen quickly and relatively unpredictably. Water supplies may be interrupted or reduced significantly in several ways, such as during a drought that limits supplies, an earthquake that damages water delivery or storage facilities, a regional power outage, or a toxic spill that affects water quality.

This WSCP describes the following:

Water Supply Reliability Analysis: Summarizes the City’s water supply analysis and reliability and identifies the key issues that may trigger a shortage condition.

Annual Water Supply and Demand Assessment Procedures: Describes the key data inputs, evaluation criteria, and methodology for assessing the system’s reliability for the coming year and the steps to formally declare any water shortage levels and response actions.

Six Standard Shortage Levels: Establishes water shortage levels to clearly identify and prepare for shortages.

Shortage Response Actions: Describes the response actions that may be implemented or considered for each level to reduce gaps between supply and demand as well as minimize social and economic impacts to the community.

Communication Protocols: Describes communication protocols under each level to ensure customers, the public, and local government agencies are informed of shortage conditions and requirements.

Compliance and Enforcement: Defines compliance and enforcement actions available to administer demand reductions.

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Legal Authority: Lists the legal documents that grant the City the authority to declare a water shortage and implement and enforce response actions.

Financial Consequences of WSCP Implementation: Describes the anticipated financial impact of implementing water shortage levels and identifies mitigation strategies to offset financial burdens.

Monitoring and Reporting: Summarizes the monitoring and reporting techniques to evaluate the effectiveness of shortage response actions and overall WSCP implementation. Results are used to determine if shortage response actions should be adjusted.

WSCP Refinement Procedures: Describes the factors that may trigger updates to the WSCP and outlines how to complete an update.

Special Water Features Distinctions: Defines considerations and definitions for water use for decorative features versus pools and spas.

Plan Adoption, Submittal, and Availability: Describes the WSCP adoption process, submittal, and availability after each revision.

This WSCP was prepared in conjunction with the City’s 2022 Urban Water Management Plan (UWMP) (Water Systems Consulting Inc. 2023) and is a standalone document that can be modified as needed. This document is compliant with the California Water Code (CWC) Section 10632 and incorporated guidance from the State of California Department of Water Resources (DWR) UWMP Guidebook 2020 (Department of Water Resources 2020) and the American Water Works Association (AWWA) Manual of Water Supply Practices (M60) Drought Preparedness and Response (American Water Works Association (AWWA) 2019).

1.1 Water Supply Reliability Analysis
This section is consistent with CWC Section 10632(a)(1) and describes the key findings of the water supply reliability analysis conducted pursuant to CWC Section 10635, which is presented in Chapter 7 of the City’s 2022 UWMP. As part of the 2022 UWMP, water suppliers must perform long-term (2025-2045) water service reliability assessment to evaluate reliability under normal, single dry year, and five-year consecutive dry year periods and a short-term (2021- 2025) Drought Risk Assessment (DRA) to evaluate reliability under a five-year consecutive dry year period. Water supply reliability reflects the City’s ability to meet the water needs of its customers with water supplies under varying conditions. The analysis considers plausible hydrological and regulatory variability, infrastructure capacity, climate conditions, and other factors that affect the City’s water supply and demand. The City expects to meet demands under all water year scenarios while continuing to promote conservation.

The DRA analyzes historical data to allow the City to view patterns and more reliably determine if there could be any water shortages within a given time frame. The DRA looks at historical consumption data by customer class, populated from billing records, and historical supply data by source from production reports. Next, future demand and supply estimates for the planning period are analyzed to determine if there are any gaps between supply and demand. As

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mentioned above, the City does not anticipate a supply shortage. The City is committed to promoting conservation to increase its resiliency and subsequent reliability.

1.2 Annual Water Supply and Demand Assessment
As established by CWC Section 10632.1, urban water suppliers must conduct an Annual Water Supply and Demand Assessment (Annual Assessment) and submit an Annual Water Shortage Assessment Report to DWR beginning by July 1, 2022, and every year after. The City prepared and submitted its first Annual Water Shortage Report as required. The Annual Assessment is an evaluation of the short-term outlook for supplies and demands to determine whether the potential for a supply shortage exists and whether there is a need to trigger a WSCP shortage level and response actions to maintain supply reliability. The annual report should report the anticipated shortage level, triggered shortage response actions, compliance and enforcement actions, and communication actions that will be implemented to mitigate the shortage identified in the Annual Assessment.

1.2.1 Key Data Inputs and Evaluation Criteria
City staff monitor the current shortage situation, the amount of available water supply, and other inputs shown below on a monthly basis. The respective water shortage condition dictates the degree at which shortage response actions are implemented at any time in the City. Some of the potential reasons to change stages are listed as follows:
• Advancement to subsequent stage
o Emergency condition, such as failure of pumping equipment, etc., that requires a percentage of water consumption reduction greater than that of the current stage. o Regulatory action that requires a percentage reduction or compliance with a water consumption standard.
o Failure to maintain target water consumption reduction goal of a given stage. • Withdrawal to previous stage
o Emergency condition has been decreased in severity or resolved, so that the previous target goal may be utilized.
o Regulatory action or standard has been resolved or modified. o Water consumption reductions have been above that necessary to meet target goals of the current stage.

The City is responsible for supplying water for the health and safety needs of the community. If the City projects a potential supply shortage in the future, actions will be taken to encourage conservation, alternative supply management may be evaluated or implemented, or the City Council may declare a water supply shortage condition.

Key data inputs and their sources for the Annual Assessments are summarized in Table 1-1 and described in detail in Section 1.2.2. Evaluation criteria that can be used to determine and declare severity of supply shortages may include any, or combinations, of the following:

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• Historic rainfall: reflects changes to supply due to reduced supply availability or changes to water usage patterns influenced by weather
• Groundwater Conditions- reflects status of groundwater conditions, which may include groundwater levels and quality
• Surface Water Conditions- reflects status of Lopez Lake storage conditions and related stages of the Low Reservoir Response Plan (LRRP)
• Existing infrastructure capabilities and plausible constraints: reflects limited production and distribution capacity due to a variety of factors potentially including, but not limited to, man-made or natural catastrophic events
• Customer demands: reflects current year and one projected single dry year conditions for comparison to available supplies
• State mandates: reflects State orders and mandatory compliance with water use efficiency standards
• Other locally applicable evaluation criteria as necessary A shortage emergency may be declared when it is demonstrated that conditions threaten the ability to provide water for public health, safety, and welfare of the community. Furthermore, compliance with State mandates for water use efficiency can be declared during drought or in preparation for future droughts, such as in response to the Governor’s drought declarations in the 2012-2016 drought with a subsequent Executive Order B-37-16 and related legislation for Making Conservation a California Way of Life. The City’s current ordinances and related municipal code are described further in Sections 1.4 and 1.7.

Short-term and long-term supply shortages may be caused by constrained production capacity or natural or man-made catastrophic emergencies and include, but are not limited to, the following events: power outages, winter storms, wildfires, earthquakes, structural failures, contamination, and bomb threats. These types of emergencies may limit the City’s immediate ability to provide adequate water service to meet the requirements for human consumption, sanitation, and fire protection. Impacts of such emergencies vary in duration; thus, consumption reduction measures and prohibitions may differ for short-term and long-term shortages.

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Table 1-1. Key Data Inputs for the Annual Assessment.

Key Data Input Source
Rainfall
Monthly rainfall data. Rainfall sources for the City include weather stations at the SLO County Public Works Volunteer Precipitation Gauge Station (Arroyo Grande Creek #736) and Arroyo Grande Corp Yard Station #177.1.

Groundwater conditions Production data, water levels, input from the Northern Cities Management Area (NCMA) groundwater monitoring program
and annual reports
Surface water conditions Delivery data, storage levels, input from Zone 3 Technical Advisory Committee (TAC) and Monthly Operations Reports.

Infrastructure capabilities and
plausible constraints
Production data, input from the City’s Public Works Department staff.

Customer demands
Customer billing data, Water equivalency table, 2022 UWMP projections, input from the City’s Public Works Department staff.

State mandates
Executive Orders from the Governor, State Water Resources Control Board (SWRCB) orders and policies, input from the City’s Water Division staff.

1.2.2 Annual Assessment Procedures
City staff will perform the Annual Assessment each year and submit it to DWR by the deadline of July 1st, or on a more frequent basis if necessary. Steps to conduct the Annual Assessment are as follows:

1. City Staff gather the key inputs, compile historical data, and analyze potential supply and demand gaps.

2. Staff provide insight on demand trends, water supply conditions, and production capacity.

3. Based on water supply and water demand information, the City Council may order, by resolution, that the appropriate water shortage stage be implemented or terminated in accordance with the applicable provisions of this WSCP and the relevant provisions of the City’s municipal code, the Government Code, and the CWC. Findings and recommendations are presented to the City Council.

4. The City Council will declare the level of shortage required at the implementation or termination of each level and the declaration shall remain in effect until the City Council declares otherwise.

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5. When a resolution of the City Council has been issued to change the water stage, the public will be notified through publication of the resolution in the local newspaper, on the City’s website, and in billing statements.

6. The City will develop and/or implement appropriate communication protocols and applicable response actions.

7. The Annual Assessment started in 2022 with the first Annual Assessment Report submitted to DWR by July 1, 2022.

1.3 Six Standard Water Shortage Levels
This section summarizes how the City’s water shortage levels from Municipal Code 13.07 are consistent with CWC Section 10632(a)(2). Shortage levels indicate the gap between supply and demand compared to normal year conditions. Table 1-2 shows the City’s shortage stages and their representative shortages. As shown in Table 1-2, the water shortage stages include consideration of water shortages up to a Shortage Level 2, which includes a greater than 50% shortage range as required by the CWC. Each stage includes supply conditions and percent of normal water supply, which may vary based on the nature of water supply emergency. The percent of normal supply ranges, percent demand reduction target ranges, and shortage criteria shown in Table 1-2 are not currently incorporated in the Municipal Code but may be if approved or amended by City Council. Due to the dynamic nature of supply and demand conditions, the City intends to evaluate these shortage criteria and utilize adaptive management of supplies and shortage response actions to appropriately address a given shortage condition. The implementation of a shortage level is dependent on the cause, severity, and anticipated duration of the water supply shortage. Therefore, Table 1-2 provides potential ranges and criteria as guidelines to determine a shortage and appropriate responses, but ultimately a combination of shortage criteria could trigger use of a combination of water shortage response actions to address a shortage as discussed in Section 1.4.

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Table 1-2. DWR 8-1 Water Shortage Contingency Plan Levels Shortage
Level
Potential
Percent of
Normal Supply
Shortage
Range
Percent
Demand
Reduction
Target
Range
Shortage Criteria
1 0-30% 0-15%
- Total water supply at or below 2,500 AFY
considering adaptive management of
groundwater levels, stored Lopez water, and/or
supplemental supplies available; and/or
- Lopez Reservoir <15,000 AF in storage; and/or
- 3 of the previous 4 quarters of sentry well level
readings below the deep well index trigger level
of 7.5 feet; and/or
- Mandatory SWRCB water use reduction
1B 31-35% 16-35%
- Total water supply at or below 2,300 AFY
considering adaptive management of
groundwater levels, stored Lopez water, and/or
supplemental supplies available; and/or
- Lopez Reservoir <10,000 AF in storage; and/or
- 6 quarterly continuous events of sentry well
level readings below the deep well index trigger
level of 7.5 feet; and/or
- Mandatory SWRCB water use reduction
2 >36% >36%, 50%
& >50%
- Total water supply at or below 2,000 AFY
considering adaptive management of
groundwater levels, stored Lopez water, and/or
supplemental supplies available; and/or
- Lopez Reservoir <5,000 AF in storage; and/or
- SMGB seawater intrusion; and/or
- Catastrophic or emergency supply interruption
New to the CWC, water suppliers must now adopt water shortage levels that equivalently address six standard water shortage levels. DWR standardized six shortage levels to provide a consistent regional and statewide approach to measure water supply shortage conditions. The six shortage levels correspond to 10-, 20-, 30-, 40-, 50-percent, and greater than 50 percent shortage compared to the normal reliability conditions. However, a water supplier may use its own shortage levels if a crosswalk is included relating its existing shortage levels to the six standard levels. A crosswalk between the City’s water shortage stages and the six standard levels is shown in Figure 1-1.

City of Arroyo Grande 11 Draft Water Shortage
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Figure 1-1: WSCP Crosswalk to DWR’s Six Standard Shortage Levels

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1.4 Shortage Response Actions
This section is in accordance with CWC Section 10632(a)(4) and 10632.5(a) and describes the response actions that may be implemented or considered for each shortage level with emphasis to minimize social and economic impacts to the community. The City expects to mitigate supply shortages through a variety of response actions including demand reduction actions, supply augmentation, operational changes, and mandatory prohibitions.

This WSCP identifies various actions to be considered by the City during water shortage conditions. In the event of a water shortage, the City will evaluate the cause of the shortage to help inform which response actions should be implemented. Depending on the nature of the water shortage, the City can elect to implement a combination of response actions to mitigate the shortage and reduce gaps between supply and demand. It should be noted that all actions listed for Level 1 apply to Level 1B and Level 2. Likewise, Level 1B actions apply to Level 2. If necessary, the City may enact additional actions that are not listed in this WSCP. The following sections discuss the potential response actions for each of the City’s water shortage levels.

1.4.1 Demand Reduction
In the event of a water shortage, the City may implement voluntary and mandatory compliance measures to induce water conservation. The City’s Municipal Code Chapter 13.07 includes prohibitions on various wasteful water uses and potential restricted use of City water during a declared water supply shortage (Attachment 1). The City’s methods include supplementing its water conservation program during WSCP implementation with progressively reduced water use allocations for various customer types as higher stages of the WSCP are implemented. In addition to the Municipal Code Chapter 13.07 provisions summarized below, the City may choose to utilize different shortage criteria (see Table 1-2) or measures that are listed in Table 1-5, or other measures deemed appropriate, at various shortage levels. The City's first priority in the implementation of these regulations and restrictions will be the preservation of water to satisfy domestic consumptive needs, for adequate fire protection, and to preserve the health, safety, and welfare of the customers of the City.

Municipal Code Chapter 13.07.030- 13.07.080
Implementation of stages of action
A. Stage 1 Water Shortage Emergency and Historical Use Water Restrictions

1. After holding a noticed public hearing in accordance with the requirements of Water Code Section 350 et seq., the City Council may, by resolution, declare a Stage 1 Water Shortage Emergency based upon a determination that Triggering Conditions exist or there have been impacts to the City’s water supply, and/or it has been determined that it is imminent that the City’s water supply has or will become so limited that an emergency water shortage condition exists as far as the available water supply being less than projected demand necessitating the institution of reductions in water usage based upon Historical Use, as further set forth in subsection 2, below.

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Triggering Conditions may include, but not be limited to; a determination that the water level at the Lopez Reservoir is at or below 15,000 acre feet; there have been six (6) quarterly continuous events of sentry well level readings below the deep well index trigger level of 7.5 feet; and/or the imposition of mandatory reductions in water use by the City by the State Water Resources Control Board.

2. Upon adoption of a Stage 1 Water Shortage Emergency resolution, all residential customers will be assigned a baseline amount of water, based upon the amount of water used during the same billing period of the previous year prior to the adoption of the resolution. All residential customers shall reduce water usage by a percentage amount set forth in the resolution, which percentages may be modified or amended by the City Council as deemed necessary and appropriate. The percentage of required conservation shall increase depending on the billing Tier of the residential customer’s water use as provided in the City’s tiered water rate structure. The resolution shall include provisions for the imposition of mandatory financial penalties if the amount of water in each Tier is exceeded, which penalties may also be modified or amended by the City Council as deemed necessary and appropriate based upon a determination of the severity of the Water Shortage Emergency.

The following shall be used as a general framework for the resolution establishing the baseline units for billing Tiers and penalties, subject to such revisions deemed necessary in order to achieve the desired water savings:

Residential customers in Tier 1 shall be required to reduce consumption by the lowest percentage. Residential customers in Tier 2 shall be required to reduce consumption by a larger percentage than those in Tier 1. Residential Customers in Tier 3 shall be required to reduce consumption by an even larger percentage than those in Tier 1 and Tier 2. For example, Tier 1 customers may initially be required to conserve 10%, Tier 2 customers 20% and Tier 3 30%. As the emergency worsens, the City Council, may by resolution, increase the percentage reduction deemed necessary in order to achieve the projected amount of water savings established as necessary.

B. Stage 1B Water Shortage Emergency—Implementation of Additional Restrictions based upon the existence of Triggering Conditions

1. After holding a noticed public hearing in accordance with the requirements of Water Code Section 350 et seq., the City Council may, by resolution, find and determine that failure to adopt and impose additional restrictions on water use and deny new or additional water service connections for projects that do not participate in a water demand offset program, would place the community in a condition that is dangerous to the health, safety and welfare of its citizens due to the severe impact on the City’s water supply, if it is determined that any specified Triggering Conditions exist.

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Based upon such a determination, the City Council may declare a Stage 1B Water Shortage Emergency that will provide that when Triggering Conditions exist additional restrictions on water use, including but not limited to denial of new or additional water service connections for projects that do not participate in a water demand offset program, will be imposed in order to protect the public health, safety and welfare of the community.

The resolution may provide that the certification by the City Manager and Public Works Director that the Triggering Conditions set forth in subsection 2 below exist, which shall result in the immediate imposition of additional regulations and restrictions on the use of water in order to provide for the protection of the public’s health, safety and welfare, as set forth in the resolution.

2. If any one of the following water supply Triggering Conditions are determined to exist, the additional water use restrictions contained in subsection 4 below shall immediately be imposed.
a. The interruption of local water deliveries, the water delivery system or additional mandated reductions in water use by the State Water Resources Control Board. b. The water level at the Lopez Reservoir is at or below 10,000 acre feet. c. There have been six quarterly continuous events of sentry well level readings in the Santa Maria Ground Water Basin below the deep well index trigger level of

7.5 feet, or indications of sea water intrusion are detected.

3. In the event that any of the foregoing Triggering Conditions are determined to exist, the Public Works Director and City Manager shall Certify to its existence, immediately notify the City Council of such determination, post the Certification of the existence of the condition on the City website, and make additional notifications to alert the public that the additional Stage 1B restrictions are being implemented.

4. The following additional regulations and restrictions shall apply in addition to the restriction imposed in the Stage 1 Water Shortage Emergency:
a. Irrigation of City-owned non-sports field turf areas shall be reduced to 25% of the water used for such irrigation in a year as specified in the adopting resolution. b. The required residential customer water reductions established in Stage 1 pursuant to Section A 2, above, shall be increased by five (5) percent for each of the three water rate tiers.
c. There shall be no new or additional water connections for any project that does not have all required planning project approvals and entitlements at the time of the Certification that a Triggering Condition exists. Smaller projects of less than four residential units or less than 5,000 sq. feet of commercial space shall be exempt from this restriction. Notwithstanding this restriction, development projects may continue to be processed.
d. The City Council may provide that the restriction contained in subsection c. above, will not apply to any project that participates in the City’s approved water

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demand offset program by providing water savings that offset their project’s water demand by a ratio of 1:1.5.

5. The foregoing Stage 1B additional regulations and restrictions contained in this Section shall no longer apply upon Certification by the Public Works Director and the City Manager that the water level at the Lopez Reservoir is at or above 15,000 acre feet and increasing, and none of the other Triggering Conditions exist, or upon a determination by the City Council that these additional water use regulations and restrictions are no longer necessary to protect the City’s water supply.

C. Stage 2 Water Shortage Emergency and Household Allocation Water Restrictions.

1. After holding a noticed public hearing in accordance with the requirements of Water Code Section 350 et seq., the City Council may declare, by resolution, a Stage 2 Water Shortage Emergency based upon a determination that Triggering Conditions exist or that the projected City’s water supply condition is or will become equal to or less than amounts that have been determined necessary to meet basic minimum household health and safety requirements, and restrictions and limits through the implementation of water allocations are necessary for continued water use that is reliable and sustainable by providing a minimum supply for the most essential purposes for human consumption, sanitation, and fire protection during the emergency situation, in order to protect the public health, safety and welfare.

Triggering Conditions may include, but not be limited to: a determination that the water level at the Lopez Reservoir is at or below 5,000 acre feet; and/or seawater intrusion is occurring in the Santa Maria Groundwater Basin; and/or there has been a catastrophic or emergency interruption in the City’s water supply.

2. Upon adoption of a Stage 2 Water Shortage Emergency, restrictions and limits shall be imposed through the implementation of Household Allocations of water units for residential customers. All residential customers will be allocated units of water deemed necessary for an average household size (1 unit of water is equal to 100 cubic feet or 748 gallons). Any residential customer using over the assigned baseline unit amount may be subject to citation and shall be subject to the imposition of mandatory financial penalties, which shall be set forth in the resolution adopted by the City Council and be based upon the severity of the Water Shortage Emergency. Each household shall be allowed 12 units of water per two month billing period (which is equivalent to 150 gallons per household per day). Households with over 5 people will be allowed 20 units of water per two-month billing period (250 gallons per day). Households with over 7 people will be allowed 28 units of water per two-month billing period (350 gallons per day). The allocations contained herein may be adjusted by the City Council by resolution.

City of Arroyo Grande 16 Draft Water Shortage
Contingency Plan
Commercial Properties and Customers with Irrigation Meters During a Stage 1 Water Shortage Emergency commercial water customers shall not be subject to mandatory penalties for use except for those with irrigation meters as provided below.

Any customer with an irrigation meter account shall reduce water use by such percentages specified in the resolution declaring the Water Shortage Emergency, which percentage reductions may be increased by the City Council by resolution upon a determination that additional reductions are necessary. The resolution shall also establish mandatory financial penalties for failing to meet required water use reductions.

During a Stage 2 Water Shortage Emergency commercial water customers shall not use potable water for irrigation of outdoor landscaping. All irrigation meters shall be shut off and billing will be suspended.

Additional Requirements and Restrictions during Stage 1, Stage 1B or Stage 2 Water Shortage Emergency
Upon adoption of a resolution declaring a Stage 1, Stage 1B or Stage 2 Water Shortage Emergency the following shall apply:

1. Commercial, industrial or irrigation meter customers shall immediately follow any directive issued or declared by the City’s Water Department to conduct water use audits, prepare water conservation plans and immediately repair any identified water system leaks, including leaks attributable to faulty pipes or fixtures. Commercial customers shall not violate any other water use restrictions intended to preclude excessive water usage, as adopted by the City.

2. Residential customers shall not violate any water use/allocation or other water rationing regulation implemented by resolution of the City Council, including such regulations intended to preclude excessive water usage and specifying maximum water usage limitations, as otherwise provided by this Chapter.

Adjustments in Water Consumption Reduction Amounts, and Other Exceptions A. During a declared Water Shortage Emergency the Director, upon application made in writing by a customer on a form promulgated by the water department and accompanied by supporting documentation, shall be authorized to modify the percentage of water consumption reduction that is required by the customer, upon the customer’s production of substantial evidence demonstrating the existence of unusual circumstances, including but not limited to the household having been vacant during a portion of the comparison year billing period, resulting in the baseline water amount assigned to the household being lower than what would normally have been experienced.

B. The percentage of reduction in water consumption may also be adjusted if the existence of one or more of the following circumstances are shown and that are particular to that customer and which are not generally shared by other water department customers:

1. Failure to approve the requested exception would cause a condition having an adverse effect on the health, sanitation, fire protection, or safety of the customer.

City of Arroyo Grande 17 Draft Water Shortage
Contingency Plan

2. Alternative restrictions to which the customer is willing to adhere are available that would achieve the same level of demand reduction as the restriction for which an exception is being sought and such alternative restrictions are enforceable by the water department.

3. Circumstances concerning the customer’s property have changed since the implementation of the subject restriction warranting a change in the customer’s water usage allocation or required percentage of reduction in consumption.

C. In order to qualify for an exception, a customer may be required at the Director’s determination, to first complete a self-water audit pursuant to standards and procedures promulgated by the water department. This audit shall be made part of the customer’s exception application and water conservation measures indicated by the audit may be incorporated as conditions of approval to an exception in addition to any other conditions of approval imposed by the Director in connection with the Director’s approval of the customer’s exception application.

Water Shortage Appeals Board (WSAB)
A. Upon adoption of a resolution declaring a Water Shortage Emergency, the Utility Billing Adjustment Committee shall be empowered to act as the Water Shortage Appeal Board (WSAB). Thereafter, the Water Shortage Appeal Board will remain available to convene for as long as the Water Shortage Emergency remains in effect.

B. Any customer who considers an action taken by the Director or an enforcement official under the provisions of this Chapter, including action on adjustments to water consumption reduction amounts, and on exception application, or the assessment of administrative penalties which have been erroneously taken or issued, may appeal that action or penalty to the Water Shortage Appeals Board in the following manner:

1. The appeal shall be made in writing, shall state the nature of the appeal specifying the action or penalty that is being appealed and the basis upon which the action or penalty is alleged to be in error. Penalty appeals shall include a copy of the bill or any applicable notice of violation;

2. An appeal, to be effective, must be received by the Director not later than ten business days following the date of the notice of violation or the date that the Director took the action which is the subject of the appeal;

3. The Director shall schedule the appeal for consideration by the WSAB. The WSAB shall hear the appeal within ninety days of the date of the appeal and issue its decision within thirty days of the date of the hearing;

4. In ruling on appeals, the WSAB shall strictly apply the provisions of this Chapter, and shall not impose or grant terms and conditions not authorized by this Chapter.

5. Decisions of the WSAB shall be subject to appeal to the City Council in accordance with the procedures in Chapter 1.12 of this Code, including the requirement that decisions be first taken up with the City Manager.

1.4.2 Supply Augmentation
The City is pursuing Central Coast Blue as a local and drought-resistant supplemental supply, as discussed in Section 6 of the City’s 2022 UWMP. Given the City’s sufficient planned supply

City of Arroyo Grande 18 Draft Water Shortage
Contingency Plan
with Central Coast Blue, the City has no immediate plan to augment supply with any additional, long-term sources in response to shortages.

1.4.3 Operational Changes
During shortage conditions, operations may be affected by demand reduction responses.

Operational changes to address a short-term water shortage may be implemented based on the severity of the reduction goal. The City will maximize its supply by implementing operational strategies and demand reduction measures. As part of the Annual Assessment process, the City will consider their operational procedures at the time of a shortage to identify changes that can be implemented to address water shortage on a short-term basis, include but not limited to:
- Expeditious leak repair
- Decrease Line Flushing
- Reduce System Water Loss

1.4.4 Additional Mandatory Restrictions
In addition to the mandatory conservation and rationing measures imposed in Stages 1 through 2, the following water waste prohibitions are in effect at all times and will remain in effect during any declared water shortage emergency.

Table 1-3. Water Shortage Contingency - Mandatory Prohibitions Prohibitions Mandatory Prohibition Stage
All use of water which results in excessive gutter runoff. None, Stage 1, 1B & 2 Use of water for cleaning driveways, patios, parking lots, sidewalks, streets, or other such uses except as necessary to protect public health or safety.

None, Stage 1, 1B & 2
Outdoor water use for washing vehicles shall be attended and have hand-controlled watering devices. None, Stage 1, 1B & 2 Outdoor irrigation between the hours of 10 AM and 4 PM. None, Stage 1, 1B & 2 Limited days for outdoor irrigation None, Stage 1, 1B & 2 Use of potable water for compaction or dust control purposes in construction activities. None, Stage 1, 1B & 2
Hotel, motel or other commercial lodging establishment shall offer their patrons the option to forego the daily laundering of towels, sheets and linens.

None, Stage 1, 1B & 2

City of Arroyo Grande 19 Draft Water Shortage
Contingency Plan
Prohibitions Mandatory Prohibition Stage
Emptying and refilling of swimming pools and commercial spas is prohibited except to prevent structural damage and/or to protect public health or safety.

None, Stage 1, 1B & 2
Restaurants or other commercial food service establishments shall not serve water except upon the request of a patron. None, Stage 1, 1B & 2

1.4.5 Emergency Response Plan
In the event of a sudden and catastrophic loss of water supply, the City has written an Emergency Response Plan (ERP) to guide the City’s employees during disasters such as earthquakes, floods, wild land fires, dam failures, and terrorism. In addition to the emergency response guidelines established for City personnel, the Plan includes a Memorandum of Understanding between cities within San Luis Obispo County to offer assistance as available to neighboring cities during time of disaster.

The ERP contains detailed action items to the following list of events that might result in a drastic loss in supply.

1. Structural Damage from an Explosive Device

2. Power Outage

3. Natural Event (Flood)

4. Natural Event (Winter Storm)

5. Natural Event (Hurricane/Tropical Storm)

6. Natural Event (Earthquake)
The City is a member of the California Water/Wastewater Agency Response Network (CalWARN) to support and promote statewide emergency preparedness, disaster response, and mutual assistance processes for public and private water and wastewater utilities. The CalWARN Program provides its member utilities with:
• A standard omnibus mutual assistance agreement and process for sharing emergency resources among Signatories statewide.
• The resources to respond and recover more quickly from a disaster. • A mutual assistance program consistent with other statewide mutual aid programs and the Standardized Emergency Management System (SEMS) and the National Incident Management System (NIMS).
• A forum for developing and maintaining emergency contacts and relationships. • New ideas from lessons learned in disasters.

In the event of a power outage, the City’s response strategy is to first determine if the reason for the outage is local to the plant or regional, then estimate the time to return power. This will provide the City with the significance of the situation and will help assess the need to secure additional fuel for generators. The treatment process would be operated to minimize the effects of the power loss. The problem should be remedied as quickly as possible, however, if the supply cannot be returned and an eventual loss of supply occurs, customers shall be notified of how to proceed.

City of Arroyo Grande 20 Draft Water Shortage
Contingency Plan
The first response in the event of an earthquake is to perform a system audit to determine the extent of damage to utilities, piping, and processes. This audit will allow the City to concentrate staff and resources on issues that need to be addressed immediately. Additional staff will be required for sampling, analysis, equipment repair, manual equipment and process operation, and communication. A report of the damage will be issued to the Incident Commander followed by a list of supplies that are necessary for repairs.

In the event of an emergency that interrupts use of a surface water source, the City will be able to provide an average flow of 300 gallons per capita per day from the City well water.

In 2021, the City completed a Risk and Resilience Assessment (RRA) and Emergency Response Plan (ERP) in accordance with America’s Water Infrastructure Act (AWIA) of 2018.

The purpose of the RRA and ERP is to meet the AWIA compliance requirements and plan for long-term resilience of the City’s infrastructure. The RRA assesses the City’s water system to identify critical assets and processes that may be vulnerable to human and natural hazards, and to identify measures that can be taken to reduce risk and enhance resilience from service disruption for the benefit of customers. The RRA identifies and characterizes both infrastructurespecific and system-wide vulnerabilities and threats and quantifies the consequences of disruption. The RRA also identifies various options (and constraints) in addressing and mitigating risk. The RRA, in conjunction with the ERP, charts a course for water system resilience. The RRA also provided various recommendations to increase reliability of the City’s system. Since critical pieces of infrastructure and specific vulnerabilities are detailed in the RRA and ERP, the contents of the document are confidential and for use by the City’s staff only.

However, the City can confirm that these plans meet the requirements set forth by AWIA and evaluate seismic risks and mitigation actions to the City’s infrastructure.

In the event of a water shortage emergency resulting from equipment failure, power outage, or other catastrophe the City may implement its water shortage levels, as described above, with either voluntary or mandatory reductions depending on the severity of the shortage. For severe disasters, mandatory water use reductions are specified.

1.4.6 Seismic Risk Assessment and Mitigation Plan
Disasters, such as earthquakes, can and will occur without notice. The RRA and ERP analyze all critical City facilities for a seismic event and address mitigation strategies. Furthermore, the 2019 San Luis Obispo County Multi-Jurisdictional Hazard Mitigation Plan (Attachment 2) contains necessary Seismic Risk Assessment and Mitigation Plan procedures.

1.4.7 Shortage Response Action Effectiveness
The City’s primary mechanism of measuring water use and, subsequently, water use reduction, is through the use of water meters. Therefore, to measure actual reductions in water use in the course of carrying out a water supply shortage contingency plan, the City may perform water meter readings for individual connections.

Potable water production figures are recorded daily at the City Corporation Yard. The daily data is compiled into monthly reports and annual reports sent to the SWRCB and San Luis Obispo

City of Arroyo Grande 21 Draft Water Shortage
Contingency Plan
County. The City also maintains copies of all reports prepared. These reports can be used to compare monthly and annual water consumption to determine the efficiency of implemented water conservation measures. If the City determines that the desired level of water conservation is not being reached, additional conservation measures can be implemented with the direction of City Council.

Although it is difficult to estimate the volume of savings for each action, the City expects to meet required reductions through a combination of response actions in conjunction with outreach and communication efforts to the extent necessary to mitigate any impacts from a water shortage.

Estimates of the effectiveness for actions have been included in Table 1-4 and Table 1-5. It is assumed that a given required shortage to be addressed can be met by quantifiable measures and the remainder of shortage can be addressed by unquantifiable measures, operations changes and additional mandatory restrictions.

Table 1-4. Estimated Savings by Shortage Level
Level
SUPPLY

CONDITION/SHORTAGE,
%
Supply/
Demand
Target1,
AF
Required
Savings1,
AF
Estimated
Savings from
Quantifiable
Actions2, AF
Estimated
Savings from
Unquantifiable
Actions, AF
1 0%-10% Reduction 2,319 232 76 156
1B 11%-35% Reduction 1,507 812 812 0
2 36%->50% Reduction 1,136 1,183 1,183 0

1. For required savings estimation purposes, it is assumed the supply and demand in 2020 (2,319 AF) would need to be reduced by 35% in Level 1B and 51% in Level 2. Required savings may be met through a combination of quantifiable and unquantifiable actions. The City will only implement measures to the extent necessary to mitigate a water shortage, although estimates may indicate a greater savings is obtainable. It is anticipated that required savings will be met through quantifiable shortage response actions and through other unquantifiable actions, including outreach efforts.

2. Quantifiable savings are estimated based on various published sources and are provided as a guide.

The degree of implementation of actions can vary in each stage and can result in a wide range of savings. For a list of all the City’s specific shortage response actions and their maximum potential savings, refer to Table 1-5.

City of Arroyo Grande 22 Draft Water Shortage
Contingency Plan
Table 1-5. DWR 8-3 Demand Reduction Actions
Shortage
Level
Demand
Reduction
Actions
How much is
this going to
reduce the
shortage gap?
Additional Explanation or
Reference
Penalty,
Charge, or
Other
Enforcement
1 Landscape -
Restrict or prohibit
runoff from
landscape
irrigation
20 AF All use of water which results
in excessive gutter runoff. Yes
1 Other - Prohibit
use of potable
water for washing
hard surfaces

0.04 AF
Use of water for cleaning
driveways, patios, parking
lots, sidewalks, streets, or
other such uses except as
necessary to protect public
health or safety.

Yes
1 Other - Require
automatic shut of
hoses

0.04 AF
Outdoor water use for
washing vehicles shall be
attended and have handcontrolled watering devices.

Yes
1 Landscape - Limit
landscape
irrigation to
specific times
26 AF Outdoor irrigation between the
hours of 10 AM and 4 PM. Yes
1 Landscape - Limit
landscape
irrigation to
specific days
26 AF Limited days for outdoor
irrigation Yes
1 Other - Prohibit
use of potable
water for
construction and
dust control
1 AF
Use of potable water for
compaction or dust control
purposes in construction
activities.

Yes

City of Arroyo Grande 23 Draft Water Shortage
Contingency Plan
Shortage
Level
Demand
Reduction
Actions
How much is
this going to
reduce the
shortage gap?
Additional Explanation or
Reference
Penalty,
Charge, or
Other
Enforcement
1 CII - Lodging
establishment
must offer opt out
of linen service
1 AF
Hotel, motel or other
commercial lodging
establishment shall offer their
patrons the option to forego
the daily laundering of towels,
sheets and linens.

Yes
1 Pools - Allow filling
of swimming pools
only when an
appropriate cover
is in place.

2.4 AF
Emptying and refilling of
swimming pools and
commercial spas is prohibited
except to prevent structural
damage and/or to protect
public health or safety.

Yes
1 CII - Lodging
establishment
must offer opt out
of linen service

0.18 AF
Restaurants or other
commercial food service
establishments shall not serve
water except upon the request
of a patron.

Yes
1B Other 812 AF Water allocations by customer
class and usage tier.

Yes
2 Other 1,183 AF Water allocations by customer
class and usage tier.

Yes

1.5 Communication Protocols
This section is in accordance with CWC Section 10632(a)(5) and describes the communication protocols and procedures to inform customers, the public, and state and local officials of any current or predicted water shortages. When a shortage level is enacted or changed, a notice is sent to all water customers and the City’s website (https://www.thinkh2onow.com/) is updated.

Based on the severity of the shortage condition, the City website contains various brochures and links to ways water customers can conserve water indoors and outdoors. When the City moves to severely restricted water supply, notices are provided containing the mandatory water restrictions to all visitor serving facilities.

City of Arroyo Grande 24 Draft Water Shortage
Contingency Plan

1.6 Compliance and Enforcement
Any violation of the conservation regulations and restrictions on water use may result in termination of water service until the violation is corrected, and until all appropriate fees and penalties are paid in full. Table 1-6 lists the specifics of the penalties and in what stages they may occur in addition to the water conservation requirements contained in City Municipal Code Section 13.05 as described below.

Violation of any provision of City Municipal Code Section 13.05 may result in termination of water service until such violation is corrected, and until penalties are paid in full and will be subject to the following administrative procedure:

1. Written notice to the alleged offender, including the furnishing of informational material and advice where appropriate;

2. Recovery of all city staff costs, including overhead, or any second or greater offense within any one-year period;

3. Additional civil administrative penalties for any third or greater offense within any oneyear period;

4. The right to appeal first to the utility billing adjustment committee and then to the city council.

In addition to, and completely separate from, the civil enforcement provisions of the ordinance codified in the City’s Municipal Code, any person who knowingly and willfully violates the provisions of this chapter shall be guilty of a criminal misdemeanor as provided in the general penalty provisions of this code. All previous attempts by the City to obtain compliance by the defendant may be introduced as evidence of the offender's knowledge and willfulness.

Table 1-6. Water Shortage Contingency - Penalties and Charges Penalty/Charge1 Stage When Penalty
Takes Effect
Imposition of increasingly significant penalties so as to create a meaningful incentive to reduce water use. None, 1, 1B & 2 Criminal misdemeanor for any person who knowingly and willfully violates the provisions in the City’s Municipal code, and may result in the installation of a flow restriction device or disconnection of the customer’s property from the City’s water service system at the customer’s cost.

None, 1, 1B & 2

City of Arroyo Grande 25 Draft Water Shortage
Contingency Plan
Penalty/Charge1 Stage When Penalty
Takes Effect
In addition to any penalties, misdemeanor criminal prosecution and the installation of a water flow restrictor, during a Water Shortage Emergency the Director may disconnect a customer’s water service for willful violations of mandatory restrictions and regulations in the City’s Municipal Code.

None, 1, 1B & 2
A person or entity that as a result of violations of Municipal Code Chapter 13.07 has a flow restrictor installed or water service disconnected is responsible for payment of charges for installing and/or removing the flow-restricting device and for disconnecting and/or reconnecting service in accordance with the City’s fee schedule then in effect. The charge for installing and/or removing any flow restricting device must be paid before the device is removed. Nonpayment will be subject to the same remedies as nonpayment of basic water rates.
1, 1B & 2
1The foregoing penalties may also be modified or amended by the City Council as deemed necessary and appropriate based upon a determination of the severity of the Water Shortage Emergency.

1.7 Legal Authorities
The City’s Ordinance 669 was adopted on February 24, 2015. The City adopted Resolution 4659 on May 26, 2015 and Resolution 4766 on November 22, 2016 in order to further implement Ordinance 669. The City adopted a Stage 1 Water Shortage Emergency through Resolution 5119 on October 12, 2021. Therefore, Ordinance 669, Resolution 4659, Resolution 4766, and Resolution 5119 effectively comprise the City’s Water Conservation and Emergency Water Shortage Restrictions and Regulations. A copy of the City’s existing Municipal Code Chapter 13.07, representing the codified ordinances and resolutions is provided in Attachment

1. Under State law, the City is authorized after declaration of a water shortage emergency to restrict the water uses and to prohibit the waste or use of the City’s water during such periods for any purpose other than domestic use, sanitation, fire protection or such other uses as may be determined by the City Council.

The City shall coordinate with San Luis Obispo 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.

1.8 Financial Consequences of WSCP
The majority of the operating costs for most water agencies are fixed rather than a function of the amount of water sold. As a result, when significant conservation programs are undertaken, it

City of Arroyo Grande 26 Draft Water Shortage
Contingency Plan
is frequently necessary to raise water rates because the revenue generated is based on lower total consumption while the revenue required is basically fixed. In order to counteract the financial impact of conservation, the City may institute an increase in the rate structure so that lower projected water consumption would generate a new rate based on the revenue needed by the City’s Water Enterprise fund.

1.9 Monitoring and Reporting
This section is in accordance with CWC Section 10632(a)(9) and describes the reporting requirements and monitoring procedures to implement the WSCP and track and evaluate the response actions effectives.

As described in Section 1.2, the City intends to track its supplies and project demands on an annual basis, and if supply conditions described in Table 1-2 are projected, the City will enact a water shortage stage. Monitoring demands is essential to ensure the WSCP response actions are adequately meeting reductions and decreasing the supply/demand gap. This will help to analyze the effectiveness of the WSCP or identify the need to activate additional response actions.

The water savings from implementation of the WSCP will be determined based on monthly production reports which will be compared to the supply from prior months, the same period of the prior year, and/ or the allocation. At first, the cumulative consumption for the various sectors (e.g., residential, commercial, etc.) will be evaluated for reaching the target demand reduction level. Then, if needed, individual accounts will be monitored. Weather and other possible influences may be accounted for in the evaluation.

1.10 WSCP Refinement Procedures
This section is consistent with CWC Section 10632 (a)(10). The WSCP is best prepared and implemented as an adaptive management plan. The City will use results obtained from monitoring and reporting procedures (described in Section 1.9) to evaluate any needs for revisions. The WSCP is used to provide guidance to the City Council, staff, and the public by identifying response actions to allow for efficient management of any water shortage with predictability and accountability.

To maintain a useful and efficient standard of practice in water shortage conditions, the requirements, criteria, and response actions need to be continually evaluated and improved upon to ensure that its shortage risk tolerance is adequate, and the shortage response actions are effective and up to date based on lessons learned from implementing the WSCP. Potential changes to the WSCP that could warrant an update include, but are not limited to, any changes to shortage level triggers, changes to the shortage level structure, and/or changes to the response actions. Any prospective changes to the WSCP would need to be presented at a public hearing, staff would obtain any comments and the City Council would adopt the updated WSCP. The steps to formally amend the WSCP are discussed in Section 1.12.

City of Arroyo Grande 27 Draft Water Shortage
Contingency Plan
Potential refinements will be documented and integrated in the next WSCP update. If new response actions are identified by staff or public, these could be advertised as voluntary actions until these are formally adopted as mandatory.

1.11 Special Water Feature Distinction
The CWC Section 10623 (b) now requires that suppliers 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. Non-pool or non-spa water features may use or be able to use recycled water, whereas pools and spas must use potable water for health and safety considerations so limitations to pools and spas may require different considerations compared to non-pool or nonspa water features. As described previously for Stages 1, 1B and 2, emptying and refilling of swimming pools and commercial spas is prohibited except to prevent structural damage and/or to protect public health or safety.

1.12 Plan Adoption, Submittal, and Availability
This section was completed pursuant to CWC Section 10632(a)(c).

This WSCP was presented for adoption to the City Council at the Month XX, 202X City Council meeting. Notifications were sent to all necessary Cities, Counties, and Cities 60 days prior to the Month XX, 202X public board meeting. To comply with the notice to the public, the City published notices in the local newspaper two weeks in advance with 5 days between publications. Copies of the 60-day notices and public hearing newspaper notices are provided in the City’s 2022 UWMP Appendix B. The WSCP was also made available in advance of the public hearing.

The WSCP was formally adopted on Month XX, 202X by the City Council through Resolution XX-XX, included as Attachment 3. The WSCP was made available to all staff, customers, and any affected cities, counties, or other members of the public at the City and online within 30 days of the adoption date.

City of Arroyo Grande 28 Draft Water Shortage
Contingency Plan

1.13 Resources and References
American Water Works Association (AWWA). 2019. "Manual of Water Supply Practices, Drought Preparedness and Response."
Department of Water Resources. 2020. "Urban Water Management Plan Guidebook 2020." Water Systems Consulting Inc. 2023. "City of Arroyo Grande 2022 UWMP."

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City of Arroyo Grande 29 Draft Water Shortage
Contingency Plan
Attachment 1: Municipal Code Chapter

13.07

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City of Arroyo Grande 29 Draft Water Shortage
Contingency Plan
Attachment 2: 2019 San Luis Obispo
County Multi-Jurisdictional Hazard
Mitigation Plan
Available at https://www.slocounty.ca.gov/Departments/Planning-Building/FormsDocuments/Plans-and-Elements/Elements/Local-Hazard-Mitigation-Plan.aspx

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City of Arroyo Grande 30 Draft Water Shortage
Contingency Plan
Attachment 3: Adoption Resolution
To be included in Final WSCP

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Selected Figures from the NCMA 2021 Annual Monitoring Report City of Arroyo Grande E Draft 2022 Urban Water Management Plan E
Selected Figures from the NCMA 2021
Annual Monitoring Report

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Santa
Maria
Guadalupe
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Arroyo
Grande
Grover
Beach
Pismo
Beach
Orcutt
Northern
Cities
Management
Area
San Luis Obispo County
Santa Barbara County
£¤101
Nipomo Mesa
Management
Area
Santa Maria
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Management Area
Date: January 28, 2020
Data Sources:

LEGEND
Northern Cities Management Area
Nipomo Mesa Management Area
Santa Maria Valley Management Area
Santa Maria Groundwater Basin (DWR 2019)
County Borders
Santa Maria Groundwater Basin
FIGURE 1
Northern Cities Management Area
San Luis Obispo County, California
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8 FIGURE 5. ANNUAL PRECIPITATION 1950 TO 2021
Northern Cities Management Area
San Luis Obispo County, California
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-10
0 10
20 30
40 50
60 70 Cumulative Departure from Average, Inches
0 10
20 30
40 50 Annual Precipitation, Inches
Drought
Drought
Average Precipitation
1950-2021: 15.6 Inches
Wet Period
Alternating Wet and Dry Years Wet Period
Normal

20 FIGURE 7. MONTHLY AND AVERAGE PRECIPITATION AND EVAPOTRANSPIRATION Northern Cities Management Area
San Luis Obispo County, California Page 501 of 699
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Meadow Creek
Los Berros Creek
Oceano Fault
Wilmar Avenue Fault
Date: February 26, 2020
Data Sources:

LEGEND
!> NCMA Monitoring Wells
Northern Cities Management Area
Faults
Streams
Locations of Monitoring Wells
FIGURE 3
Northern Cities Management Area
San Luis Obispo County, California
Document Path: Y:\_nonGISP\0672_Northern_Cities_Management_Area\Source_Figures\006_2019_Annual_Report\Annual_Report\Figure03_NCMA_Monitoring_Wells.mxd o0 1
Miles
Pacific
Ocean

14 FIGURE 4. DEPTHS OF MONITORING WELLS
Northern Cities Management Area
San Luis Obispo County, California
P:\Portland\672-Northern Cities Management Area\005-2018 Annual Report\03 Annual Report\0 Admin Draft\Figures\Parts Fig 7 NCMA Depths of Monitoring Wells.grf -700
-600
-500
-400
-300
-200
-100
0 Elevation, feet NAVD88 XD1.7
XD2.7
XD3.5
XD4.4
XD4.6
XD6.5
Well
Well Screen
Transducer
North Beach
Campground
24B
01 02 03
Highway 1
30F
01 02 03
Pier Avenue
30N
01 02 03
Oceano Dunes
36L
01 02
OCSD
Green Blue Silver Yellow
31H
H10 H11 H12 H13
County MW#3
32C03
XD
Notes:

NAVD88 - North American Vertical Datum of 1988
OCSD - Oceano Community Services District

15 FIGURE 10. SELECTED HYDROGRAPHS
Northern Cities Management Area
San Luis Obispo County, California
1990 1995 2000 2005 2010 2015 2020 2025
-20
-10
0 10
20 30
40 50
-20
-10
0 10
20 30
40 50
-20
-10
0 10
20 30
40 50
-20
-10
0 10
20 30
40 50
60 P:\Portland\672-Northern Cities Management Area\008-2021 Annual Report\03 Annual Report\0 Admin Draft\Figures\Parts Fig 10 NCMA Selected Hydrographs.grf Well 32D03
Well 32D11 Water Elevation, feet NAVD88
32D03 and 32D11
28K02
30K03
33K03
Notes:

NAVD88 - North American Vertical Datum of 1988

31 FIGURE 11. SENTRY WELL HYDROGRAPHS
Northern Cities Management Area
San Luis Obispo County, California
1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025 0 5
10 15
20 5
10 15
20 5
10 15
20 5
10 15
20 P:\Portland\672-Northern Cities Management Area\008-2021 Annual Report\03 Annual Report\0 Admin Draft\Figures\Parts Fig 11 NCMA Sentry Well Hydrographs.grf Well 24B03
Well 24B02 Water Elevation, feet NAVD88
North Beach Campground
Highway 1
Pier Avenue
Oceano Dunes
Well 30F03
Well 30F02
Well 30N02
Well 30N03
Well 36L01
Well 36L02
Flowing Artesian
Flowing Artesian
Flowing Artesian
Notes:

NAVD88 - North American Vertical Datum of 1988

32 FIGURE 12. HYDROGRAPH OF DEEP WELL INDEX ELEVATION
Northern Cities Management Area
San Luis Obispo County, California
1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 -5
-4
-3
-2
-1
0 1
2 3
4 5
6 7
8 9
10 11
12 13
14 15
16 17
18 19
20 Deep Well Index Elevation, feet NAVD88Deep Well Index Elevation (Wells 24B03, 30F03 and 30N02)
0 100
200
300
400
500
600
700
800 Chloride, mg/LWell 30N02
Well 24B03
Well 30F03
Deep Well Index Threshold: 7.5 feet
Deep Well Index is the average of groundwater
elevations in the deep wells of Sentry Well clusters
24B, 30F, and 30N (see Figure 3 for locations of
monitoring wells and Figure 4 for well depths).

P:\Portland\672-Northern Cities Management Area\008-2021 Annual Report\03 Annual Report\0 Admin Draft\Figures\Parts Fig 12 Hydrograph of Deep Well Index Level.grf Notes:

NAVD88 - North American Vertical Datum of 1988
mg/L - milligrams per liter

35 FIGURE 27. MUNICIPAL WATER USE BY SOURCE
Northern Cities Management Area
San Luis Obispo County, California
Notes:

AFY - Acre-feet per year
SWP - California State Water Project

78 This page is intentionally blank for double-sided printing.

SMGB Management Agreement & Judgment
F
SMGB Management Agreement &
Judgment

This page is intentionally blank for double-sided printing.

JAN 2 5 2008

SUPERIOR COURT OF CALIFORNIA

COUNTY OF SANTA CLARA

SANTA MARIA VALLEY WATER

CONSERVATION DISTRICT,
Plaintiff,

SANTA MARIA GROUNDWATER

LITIGATION
Lead Case No. 1-97-CV-770214
(CONSOLIDATED FOR ALL

PURPOSES)
VS. [Consolidated With Case Numbers:

CITY OF SANTA MARIA, ET AL.. CV 784900; CV 785509; CV 785522; CV 787150; CV 784921; CV 78551 1;
CV 785936; CV 787151; CV 784926;
Defendants. CV 785515; CV 786791; CV 787152;
1-05-CV-0364101
I I 1 San Luis Obispo County Superior I

AND RELATED CROSS-ACTIONS AND

ACTIONS CONSOLIDATED FOR ALL

PURPOSES
Court Case Nds. 990738 and 990739

JUDGMENT AFTER TRIAL
This matter came on for trial in five separate phases. Following the third phase of trial, a large number of parties entered into a written stipulation dated June 30, 2005 to resolve their 1 differences and requested that the cow approve the settlement and make its terms binding on 1 them as a part of any final judgment entered in this case. Subsequent to the execution of the stipulation by the original settling parties, a number of additional parties have agreed to be I I bound by the stipulation - their signatures are included in the attachments to this judgment. I Case No. 1-97-CV-770214
Judgment After Trial Page 517 of 699
The June 30, 2005 Stipulation is attached as Exhibit "1;" and all exhibits to the ,tipulation are separately attached as Exhibits "1A" through "1H". The Stipulating Parties are ientified on Exhibit "IA." The court approves the Stipulation, orders the Stipulating Parties nly to comply with each and every term thereof, and incorporates the same herein as though et forth in full. No non-stipulating party is bound in any way by the stipulation except as the ourt may otherwise independently adopt as its independent judgment a term or terms that are le same or similar to such term or provision of the stipulation.

As to all remaining parties, including those who failed to answer or otherwise appear, le court heard the testimony of witnesses, considered the evidence found to be admissible by le court, and heard the arguments of counsel. Good cause appearing, the court finds and rders judgment as follows.

As used in this Judgment, the following terms shall have the meanings herein set forth:
- The groundwater basin described in the Phase I and I1 orders of the court, as lodified, with attachments and presented in Exhibit "1B".

Defaultinn Parties - All persons or entities listed on Exhibit "3".

Imuorted Water - Water within the Basin received from the State Water Project, riginating outside the Basin, that absent human intervention would not recharge or be used in le Basin.

LOG Parties - All persons or entities listed on Exhibit "2:" listed under the subheading LOG Parties".

Non-Stipulatin~ Parties - All Parties who did not sign the Stipulation, including the )efaulting Parties and the LOG and Wineman Parties.

Pavties - All parties to the above-referenced action, including Stipulating Parties, Nontipulating Parties, and Defaulting Parties.

Public Water Producers - City of Santa Maria, Golden State Water Company, Rural Vater Company, the "Northern Cities" (collectively the Cities of Arroyo Grande, Pismo teach, and Grover Beach, and Oceano Community Services District), and the Nipomo 'ommunity Services District.
ase No. 1-97-CV-770214
~dgment After Trial Page 518 of 699
Return Flows - All water which recharges the Basin after in~tial use, through the use of percolation ponds and others means, derived from the use and recharge of imported water delivered through State Water Project facilities.

Stipulating Parties - All Parties who are signatories to the Stipulation.

Stipulation - The Stipulation dated June 30, 2005 and incorporated herein as Exhibit "1," with each of its Exhibits separately identified and incorporated herein as Exhibits "1A" through " 1 H".

Storage Space - The portion of the Basin capable of holding water for subsequent reasonable and beneficial uses.

W~nernan Parties - All persons or entities listed on Exhibit "2," under the subheading "Wineman Parties".

The following Exhibits are attached to this Judgment:

1. Exhibit "I, "June 30, 2005 Stipulation and the following exhibits thereto:
a. Exhibit "IA, " list identifying the Stipulating Parties and the parcels of land bound by the Stipulation.
b. Exhibit "IB, " Phase I and I1 Orders, as modified, with attachments. c. Exhibit "IC," map of the Basin and boundaries of the three Management Areas.
d. Exhibit "ID," map identifying those lands as of January I, 2005: 1) within the boundaries of a municipality or its sphere of influence, or within the process of inclusion in its sphere of influence; or 2) within the certificated service area of a publicly regulated utility; and a list of selected parcels that are nearby these boundaries which are excluded from within these areas.
e. Exhibit "IE, " 2002 Settlement Agreement between the Northern Cities and Northern Landowners.
f. Exhibit "IF," the agreement among Santa Maria, Golden State and Guadalupe regarding Twitchell Project and the Twitchell Management Authority. g. Exhibit "lG," the court's Order Concerning Electronic Service of Case No. 1-9743-7702 14
Judgment After Trial Page 519 of 699
'leadings and Electronic Posting of Discovery Documents dated June 27,2000. h. Exhibit "lH, " the form of memorandum of agreement to be recorded.

2. Exhibit "2, " List of Non-Stipulating LOG and Wineman Parties and recorded eed numbers of property they owned at the time of trial.

3. Exhibit "3, " List of Defaulting parties.

A declaratory judgment and physical solution are hereby adjudged and decreed s follows:

1. As of the time of trial, LOG and Wineman Parties owned the real property, sted by assessor's parcel numbers, as presented in Exhibit 2.

2. The City of Santa Maria and Golden State Water Company are awarded rescriptive rights to ground water against the non-stipulating parties, which rights shall be leasured and enforced as described below.

3. The City of Santa Maria and Golden State Water Company have a right to use le Basin for temporary storage and subsequent recapture of the Return Flows generated from leir importation of State Water Project water, to the extent that such water adds to the supply f water in the aquifer and if there is storage space in the aquifer for such return flows, lcluding all other native sources of water in the aquifer. The City of Santa Maria's Return lows represent 65 percent of the amount of imported water used by the City. Golden State Vater Company's Return Flows represent 45 percent of the amount of imported water used by iolden State in the basin.

4. (a) The Northern Cities have a prior and paramount right to produce 7,300 acre- :et of water per year from the Northern Cities Area of the Basin; and (b) the Non-Stipulating arties have no overlying, appropriative, or other right to produce any water supplies in the Iorthern Cities Area of the Basin.

5. The Groundwater Monitoring Provisions and Management Area Monitoring rograms contained in the Stipulation, including Sections IV(D) (All Management Areas); '(B) (Santa Maria Management Area), VI(C) (Nipomo Mesa Management Area), and VII (1) Vorthern Cities Management Area), inclusive, are independently adopted by the court as ase No. I -97-CV-7702 14
~dgment After Trial Page 520 of 699
necessary to manage water production in the basin and are incorporated herein and made terms of this Judgment. The Non-Stipulating Parties shall participate in, and be bound by. the applicable Management Area Monitoring Program. Each Non-Stipulating Party also shall monitor their water production, maintain records thereof, and make the data available to the court or its designee as may be required by subsequent order of the court.

6. No Party established a pre-Stipulation priority right to any portion of that increment of augmented groundwater supply within the Basin that derives from the Twitchell Project's operation.

7. The court determines that there is a reasonable likelihood that drought and overdraft conditions will occur in the Basin in the foreseeable future that will require the exercise of the court's equity powers. The court therefore retains jurisdiction to make orders enforcing the rights of the parties hereto in accordance with the terms of this judgment. a. Groundwater
I. The overlying rights of the LOG and Wineman Parties shall be adjusted by amounts lost to the City of Santa Maria and Golden State Water Company by prescription. The prescriptive rights of the City of Santa Maria and Golden State Water Company must be measured against the rights of all overlying water producers pumping in the acquifer as a whole and not just against the LOG and Wineman Parties because adverse pumping by the said water producers was from the aquifer as a whole and not just against the non-stipulating parties. The City of Santa Maria established total adverse appropriation of 5100 acre feet per year and Golden State Water Company established adverse appropriation of 1900 acre feet a year, measured against all usufructuary rights within the Santa Maria Basin.

The City of Santa Maria and Goldcn State Water Company having waived the right to seek prescription against the other stipulating parties, may only assert such rights against the non stipulating parties in a proportionate quantity. To demonstrate the limited right acquired by the City of Santa Maria and Golden State Water Company, by way of example, if the cumulative usufructuary rights of the LOG and Wineman Parties were 1,000 acre-feet and the cumulative usufructuary rights of all other overlying groundwater right holders within the 5 Case No. 1-97-CV-770214
Judgment After Trial Page 521 of 699
Basin were 100,000 acre-feet, the City of Santa Maria and Golden State Water Company would each be entitled to enforce 1% of their total prescriptive right against the LOG and Wineman Parties. That is, Golden State Water Company could assert a prescriptive right of 19 annual acre-feet, and the City of Santa Maria 51 annual acre-feet, cumulatively against the LOG and Wineman Parties, each on a proportionate basis as to each LOG and Wineman Party's individual use.
ii. The Defaulting Parties failed to appear at trial and prove any usuhctuary water rights. The rights of the Defaulting Parties, if any, are subject to the prescriptive rights of the City of Santa Maria and Golden State Water Company, as well as the other rights of said parties as established herein.
b. Imported Water
The City of Santa Maria and Golden State Water Company shall have rights to Return Flows in the amount provided above.
c. Northern Cities
The rights of all Parties in the Northern Cities Management Area shall be governed as described above on page 4, lines 21 to 24.

8. The LOG and Wineman Parties have failed to sustain the burden of proof in their action to quiet title to the quantity of their ground water rights as overlying owners. All other LOG and Wineman party causes of action having been dismissed, judgment is hereby entered in favor of the Public Water Producers as to the quiet title causes of action brought by the LOG and the Wineman Parties. Legal title to said real property is vested in the Log and Wineman Parties and was not in dispute in this action.

9. Each and every Party, their officers, agents, employees, successors and assigns, are enjoined and restrained from exercising the rights and obligations provided through this Judgment in a manner inconsistent with the express provisions of this Judgment.

10. Except upon further order of the court. each and every Party and its officers, agents, employees, successors and assigns, is enjoined and restrained from transporting groundwater to areas outside the Basin, except for those uses in existence as of the date of this 6 Case No. 1-97-CV-7702 14
Judgment After Trial Page 522 of 699
Judgment; provided, however. that groundwater may be delivered for use outside the Basin as long as the wastewater generated by that use of water is discharged within the Basin, or agricultural return flows resulting from that use return to the Basin.

11. Jurisdiction, power and authority over the Stipulating Parties as between one another are governed exclusively by the Stipulation. The court retains and reserves jurisdiction as set forth in this Paragraph over all parties hereto. The court shall make such further or supplemental orders as may be necessary or appropriate regarding interpretation and enforcement of all aspects of this Judgment, as well as clarifications or amendments to the Judgment consistent with the law.

12. Any party that seeks the court's exercise of reserved jurisdiction shall file a noticed motion with the court. Any noticed motion shall be made pursuant to the court's Order Concerning Electronic Service of Pleadings and Electronic Posting of Discovery Documents dated June 27,2000.

13. The court shall exercise de novo review in all proceedings. The actions or decisions of any Party, the Monitoring Parties, the TMA, or the Management Area Engineer shall have no heightened evidentiary weight in any proceedings before the court.

14. As long as the court's electronic filing system remains available, all court filings shall be made pursuant to court's Order Concerning Electronic Service of Pleadings and Electronic Posting of Discovery Documents dated June 27, 2000, or any subsequent superseding order. If the court's electronic filing system is eliminated and not replaced, the Parties shall promptly establish a substitute electronic filing system and abide by the same rules as contained in the court's Order.

15. Nothing in this Judgment shall be interpreted as relieving any Party of its responsibilities to comply with state or federal laws for the protection of water quality or the provisions of any permits, standards, requirements, or order promulgated thereunder.

16. Each Party shall designate the name, address and e-mail address, if any, to be used for purposes of all subsequent notices and service by a designation to be filed within thirty days after entry of this Judgment. This designation may be changed from time to time 7 Case No. 1-97-CV-770214
Judgment After Trial Page 523 of 699
)y filing a written notice with the court. Any Party desiring to be relieved of receiving notices nay file a waiver of notice on a form approved by the court. The court shall maintain at all imes a current list of Parties to whom notices are to be sent and their addresses for purposes )f service. The court shall also maintain a full current list of names, addresses, and e-mail rddresses of all Parties or their successors, as filed herein. Copies of such lists shall be wailable to any Person. If no designation is made, a Party's designee shall be deemed to be, in rder of priority: i) the Party's attorney of record; ii) if the Party does not have an attorney of ecord, the Party itself at the address specified.

17. All real property owned by the Parties within the Basin is subject to this ludgment. The Judgment will be binding upon and inure to the benefit of each Party and their espective heirs, executors, administrators, trustees, successors, assigns, and agents. Any )arty, or executor of a deceased party, who transfers property that is subject to this judgment ;hall notify any transferee thereof of this judgment and shall ensure that the judgment is ecorded in the line of title of said property. This Judgment shall not bind the Parties that :ease to own property within the Basin, and cease to use groundwater. Within sixty days ollowing entry of this Judgment, the City of Santa Maria, in cooperation with the San Luis Ibispo entities and Golden State, shall record in the Office of the County Reporter in Santa 3arbara and San Luis Obispo Counties, a notice of entry of Judgment.

The Clerk shall enter this Judgment.

SO ORDERED, ADJUDGED, AND DECREED.
>ate& January 25,2008
Juqge $the Superior Court
:ase No. 1-97-CV-770214
udgment After Trial Page 524 of 699
SBX7-7 Verification and Compliance Forms
G
SBX7-7 Verification and Compliance
Forms

This page is intentionally blank for double-sided printing.

SB X7‐7 Table 0: Units of Measure Used in 2020 UWMP*
(select one from the drop down list)
Acre Feet
*The unit of measure must be consistent throughout the UWMP, as reported in Submittal Table 2‐3.

NOTES:

NOTES: The City adjusts the DOF to account for some connections served by OCSD within City Limits and some connections served outside of City Limits.

SB X7‐7 Table 2:  Method for 2020 Population Estimate
Method Used to Determine 2020 Population
(may check more than one)

1. Department of Finance  (DOF) or
American Community Survey (ACS)

3. DWR Population Tool

4. Other
DWR recommends pre‐review

2. Persons‐per‐Connection Method

2020                                            17,641
SB X7‐7 Table 3: 2020 Service Area Population
2020 Compliance Year Population
NOTES: The City adjusts the DOF to account for some
connections served by OCSD within City Limits and some
connections served outside of City Limits.

Exported
Water *
Change in
Dist. System
Storage*
(+/‐)
Indirect
Recycled
Water
This column will
remain blank
until SB X7‐7
Table 4‐B is
completed.

Water
Delivered
for
Agricultural
Use*
Process Water
This column will
remain blank
until SB X7‐7
Table 4‐D is
completed.
2,319 ‐             ‐                                       ‐    ‐                                         ‐                            2,319 NOTES:

SB X7‐7 Table 4: 2020 Gross Water Use
2020 Volume
Into
Distribution
System
This column will
remain blank until
SB X7‐7 Table 4‐A
is completed.
2020 Gross Water
Use
2020 Deductions
*  Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP,  as reported in SB X7‐7 Table 0 and Submittal Table 2‐3.

Compliance
Year 2020

Volume   Entering
Distribution System 1
Meter Error
Adjustment 2
Optional
(+/‐)
Corrected Volume
Entering
Distribution System
77                                                       ‐ 77 Volume   Entering
Distribution System 1
Meter Error
Adjustment 2
Optional
(+/‐)
Corrected Volume
Entering
Distribution System
2,242 2,242
This water source is (check one) :

The supplier's own water source
NOTES:

SB X7‐7 Table 4‐A:  2020 Volume Entering the Distribution System(s), Meter Error Adjustment
Complete one table for each source.

Name of Source Lopez
Name of Source
SB X7‐7 Table 4‐A:  2020 Volume Entering the Distribution System(s) Meter Error Adjustment
Complete one table for each source.
1   Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP,  as reported in SB X7‐7 Table 0 and Submittal Table 2‐3.                                                                                                    2 Meter Error Adjustment  ‐ See guidance in Methodology 1, Step 3 of Methodologies Document NOTES
This water source is (check one) :

The supplier's own water source
A purchased or imported source
SMGB
Compliance Year
2020
A purchased or imported source
1 Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP,  as reported in SB X7‐7 Table 0 and Submittal Table 2‐3.                                                                               2 Meter Error Adjustment ‐  See guidance in Methodology 1, Step 3 of Methodologies Document Compliance Year
2020

2020 Gross Water
Fm SB X7‐7 Table 4
2020 Population Fm
SB X7‐7 Table 3
2020 GPCD
2,319                         17,641                            117 SB X7‐7 Table 5: 2020 Gallons Per Capita Per Day
(GPCD)
NOTES:

Extraordinary
Events1
Weather
Normalization1
Economic
Adjustment1
117                         ‐                               ‐                          ‐                       ‐                    117 153 YES NOTES:
1 All values are reported in GPCD                                                                                                                                                                                        2 2020 Confirmed Target GPCD is taken from the Supplier's SB X7‐7 Verification Form Table SB X7‐7, 7‐F.

SB X7‐7 Table 9: 2020 Compliance
Optional Adjustments to 2020 GPCD
Did Supplier
Achieve
Targeted
Reduction for
2020?
Actual 2020
GPCD1
2020  Confirmed
Target GPCD 1, 2 TOTAL
Adjustments1
Adjusted 2020
GPCD 1
(Adjusted if
applicable)
Enter "0" if Adjustment Not Used

This page is intentionally blank for double-sided printing.

AWWA Water Audits
H
AWWA Water Audits

This page is intentionally blank for double-sided printing.

P a g e | 1
CA-NV AWWA Water Loss Technical Assistance Program
Wave 4 Water Audit Level 1 Validation Document
Audit Information:

Utility: Arroyo Grande PWS ID: 4010001
System Type: Potable Audit Period: Calendar 2016
Utility Representation: Shane Taylor, Tim Schmidt
Validation Date: 9/12/2017 Call Time: 9:00 am PT Sufficient Supporting Documents Provided: Yes Validation Findings & Confirmation Statement:

Key Audit Metrics:

Data Validity Score: 50 Data Validity Band (Level): Band II (26-50) ILI: 0.84 Real Loss: 12.20 (gal/conn/day) Apparent Loss: 4.52 (gal/conn/day) Non-revenue water as percent of cost of operating system: 3.2% Certification Statement by Validator:

This water loss audit report has been Level 1 validated per the requirements of California Code of Regulations Title 23, Division 2, Chapter 7 and the California Water Code Section 10608.34.

All recommendations on volume derivation and Data Validity Grades were incorporated into the water audit. ☒ Validator Information:

Water Audit Validator: Steve Cavanaugh / Larry Lewison (support) Validator Qualifications: Contractor for CA-NV AWWA Water Loss TAP
Validator Provided

Water Audit Report for:

Reporting Year:

All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 4 244.000 acre-ft/yr 3 acre-ft/yr Water imported: 3 1,704.400 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr n/a acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 1,948.400 acre-ft/yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 6 1,822.800 acre-ft/yr
Billed unmetered: n/a 0.000 acre-ft/yr
Unbilled metered: 8 0.500 acre-ft/yr Pcnt: Value:

Unbilled unmetered: 5 4.871 acre-ft/yr 1.25% acre-ft/yr AUTHORIZED CONSUMPTION: 1,828.171 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 120.229 acre-ft/yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 4.871 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 3 23.080 acre-ft/yr 1.25% acre-ft/yr Systematic data handling errors: 4.557 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 32.508 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 87.721 acre-ft/yr WATER LOSSES: 120.229 acre-ft/yr

NON-REVENUE WATER
NON-REVENUE WATER: 125.600 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 9 88.0 miles
Number of active AND inactive service connections: 8 6,421 Service connection density: 73 conn./mile main
Yes
Average length of customer service line: ft
Average operating pressure: 4 65.0 psi

COST DATA
Total annual cost of operating water system: 10 $7,166,755 $/Year Customer retail unit cost (applied to Apparent Losses): 5 $7.14 Variable production cost (applied to Real Losses): 5 $1,412.94 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Billed metered
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
<----------- Enter grading in column 'E' and 'J' ----------> Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 50 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:

Reporting Worksheet

4.871
2016 1/2016 - 12/2016
City of Arroyo Grande (4010001)
?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property boundary,
that is the responsibility of the utility)
Use buttons to select
percentage of water supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+ Use Customer Retail Unit Cost to value real losses
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

P a g e | 1
AWWA 2017 Water Audit Level 1 Validation – Review Document Audit Information:

Utility: Arroyo Grande PWS ID: 4010001
System Type: Potable Audit Period: Calendar 2017
Utility Representation: Shane Taylor, Tim Schmidt, Mike Robles Validation Date: 9/13/2018 Call Time: 11:30 am Sufficient Supporting Documents Provided: Yes Validation Findings & Confirmation Statement:

Key Audit Metrics:

Data Validity Score: 55 Data Validity Band (Level): Band III (51-70) ILI: 0.57 Real Loss: 8.34 (gal/conn/day) Apparent Loss: 5.14 (gal/conn/day) Non-revenue water as percent of cost of operating system: 3.1%

Certification Statement by Validator:

This water loss audit report has been Level 1 validated per the requirements of California Code of Regulations Title 23, Division 2, Chapter 7 and the California Water Code Section 10608.34.

All recommendations on volume derivation and Data Validity Grades were incorporated into the water audit. ☒ Validator Information:

Water Audit Validator: Drew Blackwell Validator Qualifications: Contractor for California Water Loss TAP Validator Provided

P a g e | 2

P a g e | 3
#
AWWA Water
Audit Input Code FinalDVG Basis on Input Derivation Basis on Data Validity Grade 1 Volume from
Own Sources VOS 5
Supply meter profile: Eight ground water wells (all but Well 7 ran in 2017, Well 11 new but not in production during 2017) of which are in an adjudicated basin. Groundwater is utilized after “take or pay” volume is purchased. Meters are turbine meters with pulse output.

VOS input derived from: SCADA reads from production meters as archived.

Comments: Input derivation from supporting documents confirmed.

Exclusion of non-potable volumes confirmed.

Percent of own supply metered: 100%
Signal calibration frequency: None.

Volumetric testing frequency: Within last 5 years but less than annually.

Volumetric testing method: Pump efficiency test.

Percent of own supply tested and/or calibrated: n/a.

Comments: Grade of 4 based on occasional volumetric testing frequency.
2 VOS Master
Meter & Supply
Error Adjustment
VOS
MMSEA 3
Input derivation: Left blank in absence of available test data.

Net storage change included in MMSEA input: No.

Comments: Consider incorporating storage volume change at beginning and end of audit period directly into this input. As accuracy test results become available in the future, incorporate in to the calculation of this input.

Supply meter read frequency: Continuous.

Supply meter read method: Automatic logging via SCADA
telemetry.

Frequency of data review for trends & anomalies: Each
business day.

Storage levels monitored in real-time: Yes.

Comments: Net storage change as limiting criteria for DVG. 3 Water Imported WI 3
Import meter profile: Purchase water from San Luis Obispo County through 2 connections, each with 10” meters owned by the County. These meters were recently replaced.

WI input derived from: Input from Lopez (County) SCADA totalization.

Totalization of volumes per manual weekly reads and daily SCADA redundant meter reads by utility.

Comments: Input derivation from supporting documents confirmed.

Exclusion of non-potable volumes confirmed.

Percent of import supply metered: 100%
Signal calibration frequency: None.

Volumetric testing frequency: None.

Volumetric testing method: n/a.

Percent of import supply tested and/or calibrated: n/a.

Comments: Consider further communication with the County regarding testing / calibration methods & frequency and obtain documented results for review in future audits. Grade of 3 based no records of electronic calibration or volumetric testing.
4 WI Master Meter
& Supply Error
Adjustment
WI
MMSEA 3
Input derivation: Left blank in absence of available test data.

Comments: Testing & data mgmt. provision in supply agreement:

Agreement states AG can ask for testing to be completed if there is concern over the accuracy
Import meter read frequency: Weekly.

Import meter read method: Manual and automatic logging.

Frequency of data review for trends & anomalies: Monthly.

Comments: Grade of 3 based on limited knowledge of any
necessary corrections from the data review by the exporter. 5 Water Exported WE n/a
Export meter profile: Emergency interties: City of Grover Beach (physical connection), Pismo Beach (air gap separation)

P a g e | 4
#
AWWA Water
Audit Input Code FinalDVG Basis on Input Derivation Basis on Data Validity Grade 6 WE Master Meter
& Supply Error
Adjustment
WE
MMSEA n/a

7 Billed metered BMAC 6
Customer meter profile:

Age profile: Meter age varies, oldest meters are 20 years old based on replacement policy
Reading system: Touch.

Read frequency: Read Monthly. Billing Bi-Monthly
Comments: Lag-time correction is not employed in input derivation.

Input derivation from supporting documents confirmed (refer to spreadsheets “monthly water audits”. Input prorated for lag-time adjustment: Bi-monthly consumptions are split evenly between the two months. Exclusion of non-potable volumes confirmed. Billed metered consumption includes City facilities.

Percent of customers metered: 100%
Small meter testing policy: Reactive - complaint based or flagged-consumption testing only.

Number of small meters tested/year: Not quantified but
known to be small. Approximately 5-10 per cycle.

Large meter testing policy: Targeted testing is conducted annually for meters 2” and larger.

Number of large meters tested/year: Not quantified but
known to be small.

Meter replacement policy: Small meters based on a 20-year age threshold per A/G guidelines. Large meter replacement varies per test results.

Number of replacements/year: Not quantified but known to be small.

Billing data auditing: Standard billing QC, plus review of volumes by use type each billing cycle.

Comments: Meter testing per AWWA guidelines on meters
1” and larger. Grade of 6 is limited by small meter testing practices.
8 Billed unmetered BUAC 10 Hydrant hits only. SCADA reads exactly when hydrant is hit, and the estimation method is site specific.
9 Unbilled metered UMAC 8
Profile: Street sweeping, sewer truck and Parks water truck are filled utilizing hydrant meter.

Input derivation: Direct from monthly meter readings.

Comments: Input derivation from supporting documents confirmed.

Policy for billing exemptions: Limited to own facilities.

Comments: Grade of 8 based on limited city uses that are metered and read monthly.
0 50
100
150
200
250

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
supply-consumption
supply ac

P a g e | 5
#
AWWA Water
Audit Input Code FinalDVG Basis on Input Derivation Basis on Data Validity Grade 10 Unbilled
unmetered UUAC 5
Profile: Operational flushing (‘Other’) and fire department usage.

Comments: Flushing activities greatly scaled back due to drought. Custom California default of 0.25%xWS utilized.

Comments: Default grade applied.
11 Unauthorized
consumption UC 5 Comments: Default input applied. Comments: Default grade applied. 12 Customer
metering
inaccuracies
CMI 3
See BMAC comments regarding meter testing & replacement activities.

Input derivation: Rudimentary estimate. Input revised to 1.25% based on newer meter changeouts.

Comments: Large meter testing program results are available but not utilized in guiding a statistical testing program. Older large meters are being replaced by new technology meters.

Characterization of meter testing: Limited (upon request AND consumption flag only). Some proactive on large meters.

Characterization of meter replacement: Routine (proactive), but limited.

Comments: Grade of 3 based on the estimated input.
13 Systematic data
handling errors SDHE 5 Comments: Default input applied. Comments: Default grade applied. 14 Length of mains Lm 9
Input derivation: Totaled from GIS based map.

Hydrant leads included: Yes.

Comments: No additional comments.

Mapping format: Digital.

Asset management database: In place and integrated with GIS system.

Map updates & field validation: Accomplished through normal work order processes.

Comments: Grade of 9 based on using GIS along with an
updated asset management database.
15 Number of
service
connections
Ns 8
Input derivation: Standard report run from billing system.

Basis for database query: Location or other premise-based ID.

Comments: Inactive service connections confirmed.

CIS updates & field validation: Accomplished through normal meter reading processes.

Estimated error of total count within: 2%.

Comments: Grade of 8 based on thorough billing service
records and procedures. Internal audits by finance
department.
16 Ave length of
cust. service line Lp 10 Comments: Default input and grade applied, as customer meters are typically located at the property boundary given California climate. 17 Average
operating
pressure
AOP 4
Number of zones, general profile: Total of seven zones with the main zone gravity fed from the primary water source connection. Moderate elevation variability in terrain.

Typical pressure range: 30 to 105
Input derivation: Calculated as simple average from analysis of field data.

Extent of static pressure data collection: Hydrant pressures taken during routine system flushing and/or hydrant testing.

Characterization of real-time pressure data collection: Basic - telemetry or pressure logging at boundary points (supply locations, tanks, PRVs, boosters).

P a g e | 6
#
AWWA Water
Audit Input Code FinalDVG Basis on Input Derivation Basis on Data Validity Grade Comments: Consider utilizing available pressure data to perform weighted average by each zone (customer connections, etc) to inform overall input.

Hydraulic model: In place and calibrated within the last 5 years.

Comments: Grade of 4 based on the basic collection of
telemetry pressure data.
18 Total annual
operating cost TAOC 10
Input derivation: From official financial reports.

Comments: Confirmed costs limited to water only, and water debt service included.

Frequency of internal auditing: Annually.

Frequency of third-party CPA auditing: Annually.

Comments: No additional comments.
19 Customer retail
unit cost CRUC 8
Input derivation: Total consumptive revenue divided by Billed Metered Authorized Consumption. Sewer charges are not based on water meter readings. Sewer revenues are not applicable.

Comments: Multiple classes, residential includes tiers. The initial calculation ($7.75 per ccf) included penalty fees. This revenue was omitted and the CRUC recalculated to show $7.18 per ccf
Characterization of calculation: Weighted average composite of all rates. Input calculations have not been reviewed by an M36 water loss expert.

Comments: No additional comments.
20 Variable
production cost VPC 5
Supply profile: Import supply only (power and chemical costs deemed negligible).

Primary costs included: Purchase costs and supply & distribution power.

Secondary costs included: None currently included.

Comments: No additional comments.

Characterization of calculation: Primary costs only. Input calculations have not been reviewed by an M36 water loss expert.

Comments: Grade of 5 based on using primary costs only.

Consider any secondary cost applicability on future audits:

Pumping depreciation, liability, residuals, expansion of supply

P a g e | 7
Key Audit Metrics
(~) VALIDITY Data Validity Score: 55 Data Validity Band (Level): Band III (51-70) (#) VOLUME ILI: 0.57 Real Loss: 8.34 (gal/conn/day) Apparent Loss: 5.14 (gal/conn/day) ($) VALUE Annual Cost of Real Losses: $92,239 Annual Cost of Apparent Losses: $116,207 Infrastructure & Water Loss Management Practices:

Infrastructure age profile: 33 years average Infrastructure replacement policy (current, historic): Based on CIP and Water master plan Estimated main failures/year: Not discussed Estimated service failures/year: Not discussed Extent of proactive leakage management: None currently in place.

Other water loss management comments: Have leak detection equipment for necessary applications.

Comments on Audit Metrics & Validity Improvements
The Infrastructure Leakage Index (ILI) of 0.57 describes a system that experiences leakage at 0.57 times the modeled technical minimum for its system characteristics. While this system may experience low volumes of leakage, the ILI after level 1 validation indicates that advanced validation may be warranted before conclusions can be made regarding the system's leakage. At least one of the following scenarios may contribute to this result:
 Water Supplied (both Own Source and Imported Water) may be understated. This can occur if supply meters are under-registering more significantly than is currently reflected in the Master Meter Error & Supply Adjustment (MMSEA). This can also occur if the supply volumes include uncorrected inaccuracies in the data archives due to data gaps or SCADA formula errors.  Authorized consumption may be overstated. This can occur if sales volumes have not been pro-rated to align consumption with dates of actual use instead of the dates of meter reads. This can also occur if the BMAC input includes any non-potable volumes or duplication/exclusion of potable volumes.  The estimate of average operating pressure may be too high, thereby overestimating the technical minimum volume of leakage for the system.

The Data Validity Score falling within Band III (51-70) suggests that next steps may be focused simultaneously on improving data reliability and evaluating costeffective interventions for water & revenue loss recovery. Opportunities to improve the reliability of audit inputs and outputs include:
 Improved understanding of Supply Meter (Own or Import) Master Meter Error: consider adopting or increasing the rigor of a source meter volumetric testing and calibration program, informed by the guidance provided in AWWA Manual M36 – Appendix A. o Assess the feasibility of annual volumetric accuracy testing and/or electronic calibration  Improved estimation of CMI: consider a customer meter testing program which tests a sample of random meters whose stratification (by size, age, or other characteristics) represents the entire customer meter stock.  Temporal alignment of Billed Metered Authorized Consumption with Water Supplied: consider pro-rating the first and last months of the audit period to better align consumption with actual dates of use and using read date as basis for reporting.  Customized estimate of Unbilled Unmetered Authorized Consumption: consider producing itemized, agency-specific estimates of unbilled unmetered (operational) uses, rather than using the default. Ensure leakage estimates are excluded.

Water Audit Report for:

Reporting Year:

All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 5 134.100 acre-ft/yr 3 acre-ft/yr Water imported: 3 2,059.600 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 2,193.700 acre-ft/yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 6 2,088.870 acre-ft/yr
Billed unmetered: 10 1.340 acre-ft/yr
Unbilled metered: 8 0.590 acre-ft/yr Pcnt: Value:

Unbilled unmetered: 5 5.484 acre-ft/yr 1.25% acre-ft/yr AUTHORIZED CONSUMPTION: 2,096.284 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 97.416 acre-ft/yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 3 5.484 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 3 26.449 acre-ft/yr 1.25% acre-ft/yr Systematic data handling errors: 5 5.222 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 37.155 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 60.261 acre-ft/yr WATER LOSSES: 97.416 acre-ft/yr

NON-REVENUE WATER
NON-REVENUE WATER: 103.490 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 9 89.0 miles
Number of active AND inactive service connections: 8 6,454 Service connection density: 73 conn./mile main
Yes
Average length of customer service line: ft
Average operating pressure: 4 65.0 psi

COST DATA
Total annual cost of operating water system: 10 $6,944,500 $/Year Customer retail unit cost (applied to Apparent Losses): 8 $7.18 Variable production cost (applied to Real Losses): 5 $1,530.67 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Billed metered
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
<----------- Enter grading in column 'E' and 'J' ----------> Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 55 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:

Reporting Worksheet

5.484
2017 1/2017 - 12/2017
City of Arroyo Grande (4010001)
?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property boundary,
that is the responsibility of the utility)
Use buttons to select
percentage of water supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+ Use Customer Retail Unit Cost to value real losses
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

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2018 AWWA Water Audit Level 1 Validation
Water System Name:

City of Arroyo Grande
Water Audit & Water Loss Improvement Steps:

Water System ID Number:

CA4010001
Water Audit Period:

Calendar 2018
Steps taken in preceding year to increase data validity, reduce real loss and apparent loss as informed by the annual validated water audit:
«Information to be completed by Utility»
Replaced/repaired 37 water services. Repaired 2 water mains. Replaced (6) 2" water meters. Replaced 260 residential meters.

Certification Statement by Utility Executive:

This water loss audit report meets the requirements of California Code of Regulations Title 23, Division 2, Chapter 7 and the California Water Code Section 10608.34 and has been prepared in accordance with the method adopted by the American Water Works Association, as contained In their manual, Water Audits and Loss Control Programs, Manual M36, Fourth Edition and In the Free Water Audit Software version 5. _~« • r-k11e w::r Ta Y/4.r /
Executive Name (Print)
Ut,/·1t�5 /fie,,,",_,,,, 0
Executive Position s� I / (�9
,r /

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Cl.I
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Q.
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0 -"'
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>
/,, ...... �·

CAVANAUGH
Stewanfsnip Through Innovation
AWWA 2018 Water Audit Level 1 Validation-· Review Document Audit Information:

Utility: Arroyo Grande
System Type: Potable
PWS ID: CA4010001
Audit Period: Calendar 2018
Utility Representation: Shane Taylor, Tim Schmidt
Validation Date: 8/28/2019 Call Time: 10:30 am Sufficient Supporting Documents Provided: Yes Validation Findings & Confirmation Statement:

Key Audit Metrics:

Data Validity Score: 58 Data Validity Band (Level): Band Ill (51-70) Ill: 0.18 Real Loss: 2.66 (gal/conn/day) Apparent Loss: 7.49 (gal/conn/day) Non-revenue water as percent of cost of operating system: 3.2% Certification Statement by Validator:

This water loss audit report has been Level 1 validated per the requirements of California Code of Regulations Title 23, Division 2, Chapter 7 and the California Water Code Section 10608.34.

All recommendations on volume derivation and Data Validity Grades were incorporated into the water audit. � Validator Information:

Water Audit Validator: Larry Lewison, Will Jernigan P.E. Validator Qualifications: Contractor for California Water Loss TAP

Water Audit Report for:

Reporting Year:

All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 3 49.400 acre-ft/yr 5 acre-ft/yr Water imported: 3 2,163.100 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 2,212.500 acre-ft/yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 5 2,132.730 acre-ft/yr
Billed unmetered: 10 0.080 acre-ft/yr
Unbilled metered: 8 0.420 acre-ft/yr Pcnt: Value:

Unbilled unmetered: 8 5.531 acre-ft/yr 1.25% acre-ft/yr AUTHORIZED CONSUMPTION: 2,138.761 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 73.739 acre-ft/yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 5.531 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 3 43.534 acre-ft/yr 2.00% acre-ft/yr Systematic data handling errors: 5 5.332 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 54.397 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 19.342 acre-ft/yr WATER LOSSES: 73.739 acre-ft/yr

NON-REVENUE WATER
NON-REVENUE WATER: 79.690 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 10 89.0 miles
Number of active AND inactive service connections: 8 6,485 Service connection density: 73 conn./mile main
Yes
Average length of customer service line: ft
Average operating pressure: 5 65.0 psi

COST DATA
Total annual cost of operating water system: 10 $7,029,700 $/Year Customer retail unit cost (applied to Apparent Losses): 8 $7.80 Variable production cost (applied to Real Losses): 10 $1,562.00 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Billed metered
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
<----------- Enter grading in column 'E' and 'J' ----------> Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 58 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:

Reporting Worksheet

5.531
2018 1/2018 - 12/2018
City of Arroyo Grande (CA4010001)
?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property boundary,
that is the responsibility of the utility)
Use buttons to select
percentage of water supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+ Use Customer Retail Unit Cost to value real losses
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

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2019 AWWA Water Audit Level 1 Validation
Water System Name: Water Svstem ID Number:

C,,7 oF Arru.!:/"' 6�1't-cle... CA1-/0 /&oo/
Water Audit & Water Loss Improvement Steps:

Water Audit Period:

C0rlehclar
i:I20l9
Steps taken in preceding year to increase data validity. reduce real loss and apparent loss as informed by the annual validated water audit:
«Information to be completed by Utility»
') 2 bC) t,,v<-1 f,r h21-l--ers
'?:..) 2(; WCl f.e._, S �c.n·c�s
3) 2 t.,...rq_,/-4.r n-1,o.,·,,,�
Certification Statement by Utility Executive:
vv�e.. rrl"r-e / �,rl.
l,v "-.r-e.. r-e� I" c-e ,/�
t.--e._r� rejJ Ce ,'-d• J,_
n ,@(.A,,I P1 �-l�s...

This water loss audit report meets the requirements of California Code of Regulations Title 23, Division 2, Chapter 7 and the California Water code Section 10608.34 and has been prepared In accordance with the method adopted by the American Water Works Association, as contained ln their manual, Water Audits and loss Control Programs, Manual M36, Fourth Edition and in the Free Water Audit Software version 5.

S/4 llf //4 h'es /f1an:J er
Executive Position Signature
✓� l;-?-2o
Date

"'

CAVANAUGH
Water Audit Level 1 Validation - Review Document
Audit Information:

Utility: Arroyo Grande
System Type: Potable
PWS ID: CA4010001
Audit Period: Calendar 2019
Utility Representation: Shane Taylor, Tim Schmidt
Validation Date: 7/22/2020 Call Time: 8:30 am
Valldatlon Findings & Confirmation Statement:

Key Audit Metrics:

Sufficient Supporting Documents Provided: Yes
Data Validity Score: S6
Ill: 0.34
Data Validity Band (Levell: Band Ill (S1-70)
Real Loss: 4.97 (gal/conn/day) Apparent Loss: 7.16 (gal/conn/day) Non-revenue water as percent of cost of operating system: 2.0% Certification Statement by Validator:
s-dolilpllwurThis water loss audit report has been Level 1 valfdated per the requirements of California Code of Regulations rn:le 23, Division 2, Chapter 7 and the California Water Code Section 10608.34.

All recommendations on volume derivation and Data Validity Grades were incorporated into the water audit. 181 Validator Information:

Water Audit Validator: Drew Blackwell Validator Qualifications: Certified Water Audit Validator (CA)

Water Audit Report for:

Reporting Year:

All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 3 104.780 acre-ft/yr 5 acre-ft/yr Water imported: 3 2,034.100 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 2,138.880 acre-ft/yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 5 2,048.310 acre-ft/yr
Billed unmetered: 10 0.771 acre-ft/yr
Unbilled metered: 8 0.241 acre-ft/yr Pcnt: Value:

Unbilled unmetered: 8 1.000 acre-ft/yr 1.25% acre-ft/yr AUTHORIZED CONSUMPTION: 2,050.322 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 88.558 acre-ft/yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 5.347 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 3 41.807 acre-ft/yr 2.00% acre-ft/yr Systematic data handling errors: 5 5.121 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 52.275 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 36.283 acre-ft/yr WATER LOSSES: 88.558 acre-ft/yr

NON-REVENUE WATER
NON-REVENUE WATER: 89.799 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 10 90.0 miles
Number of active AND inactive service connections: 8 6,522 Service connection density: 72 conn./mile main
Yes
Average length of customer service line: ft
Average operating pressure: 5 65.0 psi

COST DATA
Total annual cost of operating water system: 10 $7,543,000 $/Year Customer retail unit cost (applied to Apparent Losses): 5 $3.78 Variable production cost (applied to Real Losses): 10 $1,635.00 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Billed metered
Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:

Reporting Worksheet

1.000
2019 1/2019 - 12/2019
City of Arroyo Grande (CA4010001)
*** YOUR SCORE IS: 56 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
<----------- Enter grading in column 'E' and 'J' ----------> Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property boundary,
that is the responsibility of the utility)
Use buttons to select
percentage of water supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

Copyright © 2014, All Rights Reserved.
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To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1

Water Audit Report for:

Reporting Year:

All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 3 76.900 acre-ft/yr 8 0.00% acre-ft/yr Water imported: 3 2,241.600 acre-ft/yr 4 0.00% acre-ft/yr Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 2,318.500 acre-ft/yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 8 2,165.156 acre-ft/yr
Billed unmetered: 10 0.980 acre-ft/yr
Unbilled metered: 4 2.130 acre-ft/yr Pcnt: Value:

Unbilled unmetered: 8 1.000 acre-ft/yr 1.25% acre-ft/yr AUTHORIZED CONSUMPTION: 2,169.266 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 149.234 acre-ft/yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 5.796 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 2 38.603 acre-ft/yr 1.75% acre-ft/yr Systematic data handling errors: 5 5.413 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 49.812 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 99.421 acre-ft/yr WATER LOSSES: 149.234 acre-ft/yr

NON-REVENUE WATER
NON-REVENUE WATER: 152.364 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 10 89.0 miles
Number of active AND inactive service connections: 5 6,582 Service connection density: 74 conn./mile main
Yes
Average length of customer service line: ft
Average operating pressure: 9 65.0 psi

COST DATA
Total annual cost of operating water system: 10 $7,476,818 $/Year Customer retail unit cost (applied to Apparent Losses): 5 $7.14 Variable production cost (applied to Real Losses): 9 $1,589.00 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Unbilled metered
Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:

Reporting Worksheet

1.000
2020 1/2020 - 12/2020
City of Arroyo Grande (CA 4010001)
*** YOUR SCORE IS: 55 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
<----------- Enter grading in column 'E' and 'J' ----------> Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed ?
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Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
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(length of service line, beyond the property boundary,
that is the responsibility of the utility)
Use buttons to select percentage of water supplied
OR
value
Click here: ?
for help using option
buttons below
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WAS v5.0
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American Water Works Association.

Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+ Use Customer Retail Unit Cost to value real losses
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.

AWWA Free Water Audit Software v5.0 Reporting Worksheet 1