Atwater City Council
June 22, 2026

City of Atwater
2025 Urban Water Management Plan
June 2026
6-17

6.1.10.2 Quantification of Supplies
The actual (2025) water supplies for the City are summarized in Table 6-9 (DWR Table 6-8 Retail). The projected water supplies for the City are summarized in Table 6-10 (DWR Table 6-9 Retail).

Table 6-9 – Water Supplies – Actual (DWR Table 6-8 Retail) Submittal Table 6-8 Retail: Water Supplies — Actual
Water Code Section 10631(b)
Water Supply
Additional Description
(as needed)
2025
Drop down list
May use each category
multiple times. These are
the only water supply
categories that will be
recognized by the
WUEdata online submittal
tool
Potable or NonPotable
(after treatment
if treated)
(OPTIONAL)
Drop Down list
Actual
Volume
Total
Entitlement
(OPTIONAL)
See 'DWR
Notes' below
Add additional rules as needed
Groundwater (not
desalinated) Merced Subbasin Potable 6,812
Subtotal Potable 6,812 0
Subtotal Non-Potable 0 0
Total 6,812 0
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

Total Entitlement: e.g. Water Right, Groundwater Allocation, Contracted Amount.

NOTES: No additional notes.

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2025 Urban Water Management Plan
June 2026
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Table 6-10 – Water Supplies – Projected (DWR Table 6-9 Retail) Submittal Table 6-9 Retail: Water Supplies — Projected Water Code Section 10631 (b) Water Supply
Additional
Detail on
Water Supply
Potable or Non-Potable
(after treatment if
treated)
(OPTIONAL)
Drop Down list
Projected Water Supply (Report to the Extent Practicable) Drop down list
May use each category multiple
times. These are the only water
supply categories that will be
recognized by the WUEdata
online submittal tool
2030 2035 2040 2045 2050 (opt)
Reasonably
Available
Volume
Total
Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total
Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total
Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total
Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total
Entitlement
(OPTIONAL)
See "DWR Notes"
below
Add additional rows as needed
Groundwater (not
desalinated)
Merced
Subbasin Potable 3,915 3,940 3,966 3,991
Subtotal Potable 3,915 0 3,940 0 3,966 0 3,991 0 0 0
Subtotal Non-Potable 0 0 0 0 0 0 0 0 0 0
Total 3,915 0 3,940 0 3,966 0 3,991 0 0 0
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. Total Entitlement: e.g. Water Right, Groundwater Allocation, Contracted Amount.

NOTES: As the City receives it's water supply from a groundwater source, the projected supply available is equal to the projected demands.

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2025 Urban Water Management Plan
June 2026
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6.1.11 Special Conditions
Numerous special conditions may affect water supplies. Potential climate change impacts were discussed in Section 4.2.7. Water demand in the City has generally decreased over the past decade due to measures taken by the City that are further discussed in Chapter 9. Regulatory conditions and other locally applicable criteria are not anticipated to affect the City’s water supply.

6.2 Energy Use
Legal Requirements:

CWC Section 10631.2. (a):

In addition to the requirements of Section 10631, an urban water management plan shall include any of the following information that the urban water supplier can readily obtain:
(1) An estimate of the amount of energy used to extract or divert water supplies. (2) An estimate of the amount of energy used to convey water supplies to the water treatment plants or distribution systems.
(3) An estimate of the amount of energy used to treat water supplies. (4) An estimate of the amount of energy used to distribute water supplies through its distribution systems.
(5) An estimate of the amount of energy used for treated water supplies in comparison to the amount used for nontreated water supplies.
(6) An estimate of the amount of energy used to place water into or withdraw from storage. (7) Any other energy-related information the urban water supplier deems appropriate.

Water energy intensity represents the total amount of energy expended, calculated on a whole-system basis, to deliver water to customers. Energy intensity is expressed in kilowatt-hours per acre-foot and reflects the energy required to convey water from its source through treatment and distribution to the point of delivery. Evaluating whole-system energy intensity enables the City to make informed decisions in managing its water supplies and operating its facilities, including:
• Identifying opportunities to reduce energy consumption; • Estimating energy savings and greenhouse gas emission reductions associated with water conservation programs;
• Supporting applications for grants related to energy efficiency and water conservation initiatives; • Informing climate change mitigation and adaptation strategies; and • Benchmarking energy use across individual water supply, treatment, and distribution components and comparing performance with similar agencies.

Energy intensity was calculated using the tables provided by DWR. DWR Table O-1B was selected for reporting the water delivery product energy usage. The energy use tables for retail water delivery, wastewater, and recycled water are provided in Appendix E.

Energy intensity calculations for 2025 indicate that the City delivered approximately 6,812 AF of potable water using approximately 5.1 million kilowatt-hours (kWh) of energy, resulting in an energy intensity of approximately 2,296 kWh per MG. Energy consumption is primarily associated with groundwater extraction through well pumping and distribution operations.

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For wastewater operations, the City treated approximately 3,504 AF of wastewater using approximately

4.9 million kWh of energy, resulting in an energy intensity of approximately 4,280 kWh/MG. Energy use for wastewater operations is primarily related to pumping and treatment processes at the wastewater treatment plant. Because the City does not currently produce or distribute recycled water, recycled water energy use and associated energy intensity values are not applicable.

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2025 Urban Water Management Plan
June 2026
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7 Water Service Reliability and Drought Risk Assessment The UWMPA requires that the UWMP address the reliability of the City's long term water supplies. This includes a description of supply constraints which may impact the supply. Also included is a comparison between the City’s supply and demand for a normal year, single-dry year, and five-consecutive year drought.

7.1 Constraints on Water Sources
Legal Requirements:

CWC Section 10631 (b)(1):

A detailed discussion of anticipated supply availability under a normal water year, single dry year, and droughts lasting at least five years, as well as more frequent and severe periods of drought, as described in the drought risk assessment. For each source of water supply, consider any information pertinent to the reliability analysis conducted pursuant to Section 10635, including changes in supply due to climate change.

Water Code Section 10634
The plan shall include information, to the extent practicable, relating to the quality of existing sources of water available to the supplier over the same five-year increments as described in subdivision (a) of Section 10631, and the manner in which water quality affects water management strategies and supply reliability.

Water Code Section 10635 (b)(2)
A determination of the reliability of each source of supply under a variety of water shortage conditions.

This may include a determination that a particular source of water supply is fully reliable under most, if not all, conditions.

Water Code Section 10635 (b)(4)
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.

Evaluating the reliability of the City’s water supply is complex due to a variety of factors that can affect water source availability and dependability. These factors may include legal issues, environmental constraints, water quality, and climatic variations. The following sections describe these factors.

7.1.1 Legal
The supplies the City relies upon are neither in the process of adjudication nor the subject of any new legislation limiting them. Therefore, the City does not anticipate legal factors influencing the reliability of groundwater within the near term. However, if future stringent laws, regulations, or standards are introduced into the Merced’s Subbasin GSP that mitigate the usage of the Subbasin, this may lead to legal factors playing a larger role on the constraints of the City’s available water source.

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2025 Urban Water Management Plan
June 2026
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7.1.2 Environmental
The status of environmental regulation in California changes due to new legislation, endangered species statuses, and other factors. Should new environmental legislation come into existence, it could potentially impact the City's available supply. The recent water supply reductions in the Bay-Delta are an example of environmental water needs versus community water supplies. The City does not anticipate environmental factors influencing groundwater reliability.

7.1.3 Water Quality
Water quality testing, as summarized in the City’s Consumer Confidence Reports for 2021 – 2024 (provided in Appendix F) shows that the City consistently meets or surpasses all U.S. Environmental Protection Agency and State drinking water health standards with one exception: TCP.

The City historically has surpassed the newly established TCP maximum contaminant level (MCL) of 5 parts per trillion. The City has since installed treatment equipment to achieve compliance with the TCP MCL to prevent future incompliance with this water quality standard. Dibromochloropropane and ethylenedibromide have also been detected in the water supply but are not at high enough levels to be posed as a concern. Further monitoring of these constituents will continue to prevent surpassing their MCLs.

7.1.4 Climatic Factors
Climate change adds uncertainties to water supply planning. Changes to temperatures and precipitation patterns may impact water demands and supply availability. As discussed in Section 4.2.7, resource management strategies are being implemented to mitigate the effects of the potential impacts due to climate change.

7.2 Water Service Reliability Assessment (WSRA)
Legal Requirements:

CWC Section 10635(a):

Every urban water supplier shall include, as part of its urban water management plan, an assessment of the reliability of its water service to its customers during normal, dry, and multiple dry water years.

This water supply and demand assessment shall compare the total water supply sources available to the water supplier with the long-term total projected water use over the next 20 years, in five-year increments, for a normal water year, a single dry water year, and a drought lasting five consecutive water years. The water service reliability assessment shall be based upon the information compiled pursuant to Section 10631, including available data from state, regional, or local agency population projections within the service area of the urban water supplier.

Expected water service reliability pursuant to Section 10635 of the Water Code is assessed in the following sections.

7.2.1 WSRA Year-Type Characterization
This section addresses the reliability of the City’s water supply in average, single dry, and multiple dry water years. The City uses the following water year definitions from the UWMP Guidebook:

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2025 Urban Water Management Plan
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• Normal Year: a year, or an averaged range of years, that most closely represents the average water supply available to the agency. For the purposes of this UWMP, the terms “normal” and “average” are used interchangeably.
• Single-Dry Year: the year that represents the lowest water supply available to the agency. • Five-Consecutive-Year Drought: the driest five-year historical sequence for the Supplier (Water Code Section 10612).

Table 7-1 (DWR Table 7-1 Retail) shows the basis of water year data as a percentage of average supply.

The base years were selected using rainfall data from CIMIS. In addition, the available supply volume, and the percentage relative to the average year are listed. The average year was selected by evaluating the ten-year per capita water use and determining the year that best represents the average.

Table 7-1 – Basis of Water Year Data (DWR Table 7-1 Retail) Year Type
Base Year
If not using a
calendar year,
type in the last
year of the fiscal,
water year, or
range of years, for
example, water
year 2024-2025,
use 2025
Available Supplies if
Year Type Repeats
Check the box if quantification of available
supplies is not compatible with this table and
is provided elsewhere in the UWMP.

Location: Not Applicable
Quantification of available supplies is provided in
this table as either volume only, percent only, or
both.

Volume Available % of Average Supply
Average Year 2009 9,259 100%
Single-Dry Year 2015 70%
Consecutive Dry Years 1st Year 2014 70%
Consecutive Dry Years 2nd Year 2015 70%
Consecutive Dry Years 3rd Year 2016 70%
Consecutive Dry Years 4th Year 2017 80%
Consecutive Dry Years 5th Year 2018 90%
DWR NOTES: Supplier may use multiple versions of Submittal Table 7-1 R if different water sources have different base years and the supplier chooses to report the base years for each water source separately. If a Supplier uses multiple versions of Submittal Table 7-1 R, in the "Note" section of each submittal table, state that multiple versions of Submittal Table 7-1 R are being used and identify the particular water source that is being reported in each submittal table.

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table reports the units of measure reported in Submittal Table 2-3.

NOTES: Volume available was estimated based on the volume pumped for the base year listed. % of Average Water Supply is rounded to the nearest 10%.

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2025 Urban Water Management Plan
June 2026
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7.2.2 Service Reliability – Supply and Demand Comparison Legal Requirements:

CWC Section 10635(a):

Every urban water supplier shall include, as part of its urban water management plan, an assessment of the reliability of its water service to its customers during normal, dry, and multiple dry water years.

This water supply and demand assessment shall compare the total water supply sources available to the water supplier with the long-term total projected water use over the next 20 years, in five-year increments, for a normal water year, a single dry water year, and a drought lasting five consecutive water years. The water service reliability assessment shall be based upon the information compiled pursuant to Section 10631, including available data from state, regional, or local agency population projections within the service area of the urban water supplier.

The water service reliability for a Normal Year, Single-Dry Year, and Multiple Dry Years is discussed in the following sections.

7.2.2.1 Water Service Reliability – Normal Year
The availability of the City’s supplies in Normal Years is described in detail in Chapter 6.

As shown in Table 7-2 (DWR Table 7-2 Retail), the City’s Normal Year supplies are adequate to meet projected Normal Year demands through 2045.

Table 7-2 – Normal Year Supply and Use Comparison (DWR Table 7-2 Retail) Submittal Table 7-2 Retail: Normal Year Supply and Use Comparison Water Code Section 10635 (a)
2030 2035 2040 2045 2050
(Opt)
Supply totals
(autofill from Submittal
Table 6-9 R)
3,915 3,940 3,966 3,991 -
Use totals
(autofill from Submittal
Table 4-2 R)
3,915 3,940 3,966 3,991 -
Surplus/(shortfall) 0 0 0 0 0
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: No additional notes.

7.2.2.2 Water Service Reliability – Single-Dry Year
The City’s projected water supply and demand for a Single-Dry Year are assumed to equal 70% of the Normal Year’s projected water supply and demand as presented in Table 7-1 (DWR Table 7-1 Retail).

As shown in Table 7-3 (DWR Table 7-3 Retail), the City’s Single-Dry Year supplies are adequate to meet projected Single-Dry Year demands.

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2025 Urban Water Management Plan
June 2026
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Table 7-3 – Single Dry Year Supply and Use Comparison (DWR Table 7-3 Retail) Submittal Table 7-3 Retail: Single Dry Year Supply and Use Comparison Water Code Section 10635(a)
2030 2035 2040 2045 2050
(Opt)
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: As the City receives its water supply from a groundwater source, the projected supply available is equal to the projected demands.

7.2.2.3 Water Service Reliability –Multiple Dry Years
Per CWC Section 10612, the five-consecutive-year drought is the driest five-year historical sequence for the supplier. The City’s water supply and demand for the five-consecutive-year drought are assumed to follow the pattern presented in Table 7-1 (DWR Table 7-1 Retail). As shown in Table 7-4 (DWR Table 7-4 Retail), the City’s five-consecutive-year drought supplies are adequate to meet projected demands.

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2025 Urban Water Management Plan
June 2026
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Table 7-4 – Multiple Dry Years Supply and Use Comparison (DWR Table 7-4 Retail) Submittal Table 7-4 Retail: Multiple Dry Years Supply and Use Comparison Water Code Section 10635(a)
2030 2035 2040 2045 2050
(Opt)
First year
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
Second year
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
Third year
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
Fourth year
Supply totals 3,132 3,152 3,173 3,193 -
Use totals 3,132 3,152 3,173 3,193 -
Surplus/(shortfall) 0 0 0 0 0
Fifth year
Supply totals 3,523 3,546 3,569 3,592 -
Use totals 3,523 3,546 3,569 3,592 -
Surplus/(shortfall) 0 0 0 0 0
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Refer to Table 7-3 for explanation of Supply and Use Totals equal to each other. Refer to Table 7-1 for factor reductions on a yearly basis during multiple dry years.

7.2.3 Description of Management Tools and Options
Legal Requirements:

CWC Section 10620(f):

An urban water supplier shall describe in the plan water management tools and options used by that entity that will maximize resources and minimize the need to import water from other regions.

The City is implementing water management tools and options to maximize local resources and minimize the need to import water from other regions. These tools and options include membership in the Merced Irrigation-Urban GSA and participation in implementing the GSP, and resource management strategies, including studies to evaluate the feasibility of developing recycled water and surface water as alternative water sources.

Tables 7-2 through 7-4 (DWR Tables 7-2 through 7-4) indicate that the City does currently have sufficient water supply to meet projected demands during a five-year drought. Water supply totals assume sufficient groundwater will be available based on the well capacities in the City water system. This assumption should be re-evaluated regularly. The WSCP discusses measures for reducing water demands in case of water shortage conditions.

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2025 Urban Water Management Plan
June 2026
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7.3 Drought Risk Assessment
Legal Requirements:

CWC Section 10612
“Drought Risk Assessment” means a method that examines water shortage risks based on the driest five-year historic sequence for the agency’s water supply, as described in subdivision (b) of Section 10635.

CWC Section 10635(b):

Every urban water supplier shall include, as part of its urban water management plan, a drought risk assessment for its water service to its customers as part of information considered in developing the demand management measures and water supply projects and programs to be included in the urban water management plan. The urban water supplier may conduct an interim update or updates to this drought risk assessment within the five-year cycle of its urban water management plan update. The drought risk assessment shall include each of the following:
(1) A description of the data, methodology, and basis for one or more supply shortage conditions that are necessary to conduct a drought risk assessment for a drought period that lasts five consecutive water years, starting from the year following when the assessment is conducted. (2) A determination of the reliability of each source of supply under a variety of water shortage conditions. This may include a determination that a particular source of water supply is fully reliable under most, if not all, conditions.
(3) A comparison of the total water supply sources available to the water supplier with the total projected water use for the drought period.
(4) 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.

This section provides a Drought Risk Assessment (DRA) based on the five driest consecutive years on record and plausible changes in climate, regulations, and other locally applicable criteria. A description of the data and methods used, basis for the supply shortage conditions, determination of the reliability of each source, and comparison of total water supplies and uses during a drought is provided below.

7.3.1 DRA Data, Methods, and Basis for Water Shortage Conditions The data used for the DRA is historical well data for 2014-2018, the driest five-year historical sequence for the City, and other historical records regarding the water system. Historical groundwater production data were evaluated to assess changes in well performance and system reliability during drought conditions and to determine whether drought-related supply constraints occurred. Additional information is available in the Merced Subbasin GSP.

7.3.2 DRA Water Source Reliability
Based on historical well production data for 2014-2018, well production was not affected by drought conditions during a five-year drought period. Therefore, this DRA assumes that the total water supply is projected to be equivalent to a sustainable average groundwater production for each dry year.

Unforeseen water supply and quality issues, potential regulations on new contaminants, and changes in aquifer conditions may adversely affect the water supply and should be monitored closely.

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7.3.3 Total Water Supply and Use Comparison
The total water supply and use comparison is shown in Table 7-5 (DWR Table 7-5 Retail). The comparison indicates that the City has sufficient water supply to meet projected demands during a five-year drought and that no water shortage condition is projected during the five-year drought scenario evaluated. The WSCP discusses measures for reducing water demands in case of water shortage conditions.

Table 7-5 – Five-Year Drought Risk Assessment (DWR Table 7-5 Retail) Submittal Table 7-5 Retail: Five-Year Drought Risk Assessment Water Code Section 10635(b)(3)
2026 Total
Total Water Use 4,090
Total Supplies 4,090
Surplus/Shortfall w/o WSCP Action 0
2027 Total
Total Water Use 3,411
Total Supplies 3,411
Surplus/Shortfall w/o WSCP Action 0
2028 Total
Total Water Use 2,733
Total Supplies 2,733
Surplus/Shortfall w/o WSCP Action 0
2029 Total
Total Water Use 3,128
Total Supplies 3,128
Surplus/Shortfall w/o WSCP Action 0
2030 Total
Total Water Use 3,523
Total Supplies 3,523
Surplus/Shortfall w/o WSCP Action 0
DWR NOTES: Units of measure (AF, CCF, MG) must remain
consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Refer to Table 7-3 for explanation of Supply and Use Totals equal to each other. Refer to Table 7-1 for factor reductions on a yearly basis during multiple dry years.

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8 Water Shortage Contingency Plan
In response to the severe drought of 2012-2016, legislation was adopted in 2018 mandating that the UWMP include a WSCP that provides a detailed proposal for assessing water supply availability and response actions to water shortage conditions. The WSCP is to be a stand-alone document which will allow for amending the plan without amending the 2025 UWMP. The City WSCP is provided in Appendix G. Refer to the WSCP for the following DWR Tables:
• DWR Tables 8-1: Cross-Reference for Standard vs Supplier Shortage Levels • DWR Tables 8-2: Supply Augmentation and Other Actions • DWR Tables 8-3: Demand-Reduction Actions

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9 Demand Management Measures
This chapter describes the City’s historical and existing DMMs implemented to promote water conservation and reduce demands on available water supplies. The discussion includes past, current, and projected DMMs. These measures are a key component of the City’s long-term water supply planning and are also integral to the effectiveness of the WSCP, which is provided in Appendix G.

In prior UWMPs, water suppliers were required to provide extensive data documenting progress in implementing specific DMMs. However, AB 2067, enacted in 2014, simplified and updated DMM reporting requirements. The revised framework shifted the focus from detailed documentation of individual measures to implementation of core conservation actions designed to support compliance with the water use efficiency targets established under SB X7-7.

For retail water suppliers, the number of required DMMs was reduced to six standardized measures, along with an additional “other” category. Under the current requirements, agencies must provide a narrative description of the status of each DMM and explain how these measures contribute to achieving water efficiency goals; detailed quantitative data are no longer required.

The following sections summarize the City’s current and planned efforts to implement the applicable DMMs.

9.1 Report Implementation

9.1.1 Implementation over the Past Five Years
All DMM discussed in Section 9.2 have been implemented over the past five years and are continuing to be implemented. The City is committed to programs designed to conserve and protect the quantity and quality of its groundwater resource. The overall reduction of water and compliance with the SB X7-7 2020 target indicate that the programs adopted in the community have been effective. The detailed activities and expenditure information for each program have not been closely tracked in the past. The City is planning to track and record these activities and costs in the future to determine the effectiveness of each program.

9.1.2 Implementation to Achieve Water Use Targets
As discussed in Chapter 5, the City has met the SB X7-7 2020 target. The City will continue to implement the above described DMMs to reduce water demands and protect the groundwater supply.

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9.2 Existing Demand Management Measures for Retail Suppliers Legal Requirements:

CWC Section 10631:
(e)Provide a description of the supplier’s water demand management measures. This description shall include all of the following:
(1)(A) For an urban retail water supplier, as defined in Section 10608.12, a narrative description that addresses the nature and extent of each water demand management measure implemented over the past five years. The narrative shall describe the water demand management measure that the supplier plans to implement to achieve its water use targets pursuant to Section 10608.20. (B)The narrative pursuant to this paragraph shall include descriptions of the following water demand management measures:
(i)Water waste prevention ordinances.
(ii)Metering.
(iii)Conservation pricing.
(iv)Public education and outreach.
(v)Programs to assess and manage distribution system real loss. (vi)Water conservation program coordination and staffing support. (vii)Other demand management measures that have a significant impact on water use as measured in gallons per capita per day, including innovative measures, if implemented.

In accordance with Urban Water Management Plan requirements, this plan addresses the following six DMMs:
• Water waste prevention ordinances
• Metering
• Conservation-oriented pricing
• Public education and outreach
• Programs to assess and manage distribution system real losses • Water conservation program coordination and staffing support In addition, the City is required to describe any other DMMs that have been implemented and have had a significant effect on water use within the service area.

This section describes both the DMMs currently in place and those planned for future implementation.

For each DMM, the discussion includes a description of the existing program, an overview of implementation activities during the previous five-year period, and a summary of planned future actions.

9.2.1 Water-Waste Prevention Ordinances
The City enforces water waste prevention requirements throughout its service area pursuant to the City of Atwater Municipal Code, included as Appendix H, Chapter 13.13 – Water Conservation Program. This chapter defines prohibited uses of water, establishes standards for efficient water use, and declares certain nonessential water uses to be unlawful. Among other provisions, municipal code Section

13.13.030 prohibits water abuse including causing or allowing water delivered by the City’s system to flow off property into gutters, ditches, or across public rights-of-way and prohibits broken or defective plumbing, sprinklers, or irrigation systems that permit leakage. The code also includes irrigation day/time restrictions and other water use prohibitions intended to promote water efficiency year-round.

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City staff are authorized to enforce these requirements through administrative citations and penalties for violations, as specified in Municipal Code Section 13.13.040, which establishes escalating penalties for repeated noncompliance. The full text of the Water Conservation Program and related enforcement provisions is available through the City’s Municipal Code of Ordinances on the City’s website at:
https://www.atwater.org/.

The effectiveness of this Demand Management Measure is evaluated based on the number of reported or observed violations. Over the past five years, the City has not received any water waste complaints or recorded violations.

Implementation of this measure is ongoing. Although water savings associated with water waste prevention ordinances cannot be directly quantified, this measure is expected to support the City’s water use efficiency goals by discouraging nonessential water use and prioritizing water availability for critical needs such as human consumption, sanitation, and fire protection.

9.2.2 Metering
Legal Requirements:

CWC Section 526:
(a) Notwithstanding any other provisions of law, an urban water supplier that, on or after January 1, 2004, receives water from the federal Central Valley Project under a water service contract or subcontract... shall do both of the following:
(1) On or before January 1, 2013, install water meters on all service connections to residential and nonagricultural commercial buildings... located within its service area.

Water Code section 527
(a) An urban water supplier that is not subject to Section 526 shall do both the following:
(1) Install water meters on all municipal and industrial service connections located within its service area on or before January 1, 2025.

In accordance with CWC Section 526, the City of Atwater has required installation of water meters on all new or replaced services installed since January 1, 1992. Historically the City was only partially metered, with large industrial, commercial, multi-family, and landscape irrigation services metered and billed monthly on a volume-of-use basis.

As of the beginning of 2025, approximately half of the residential water services remained unmetered.

However, at the end of 2025, the City had made significant progress toward system-wide metering, with over 90 percent of all services, including residential, commercial, industrial, multi-family, and irrigation, equipped with water meters and billed based on metered usage.

The current water service rate structure is included in Appendix I. The rate structure is intended to raise sufficient funds to allow the City to properly maintain its water system. Funds to maintain and expand the system are also collected through development fees.

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9.2.3 Conservation Pricing
The City completed a comprehensive Water and Wastewater Rate Study in 2019 (2019 Rate Study), which is summarized in Appendix I. The objectives of the 2019 Rate Study were to ensure that water and wastewater rates generate sufficient revenue to meet operational and maintenance costs, fund planned capital improvements, and establish and maintain appropriate financial reserves.

The City customers are charged a monthly fixed service fee based on meter size and customer classification, which includes a base water allotment of 19,000 gallons per month. Water use in excess of this allotment is subject to a volumetric usage charge based on metered water consumption. Water use is billed in units of a thousand gallons (T-Gal). Volumetric water rates are established based on the costs associated with water distribution within the City’s service area.

At the time of this plan, customers exceeding the monthly allotment are billed a uniform volumetric rate of $2.04 per T-Gal. The use of this tiered volumetric pricing provides a direct financial incentive for customers to reduce water consumption and adopt efficient water use practices.

Implementation of this Demand Management Measure supports the City’s water use efficiency objectives by ensuring that customers pay rates that reflect the true cost of providing water service. This approach helps adequately fund system operations, maintenance, repair and replacement programs, and ongoing water conservation efforts. The City will continue to evaluate the effectiveness of its rate structure by monitoring trends in unit water use in response to rate adjustments.

9.2.4 Public Education and Outreach
The City seeks to promote lasting, sustainable changes in water use behavior through an active public education and outreach program, rather than relying solely on short-term responses during drought conditions. These efforts are designed to increase customer awareness of water resource limitations, encourage efficient water use practices, and support compliance with local and State conservation requirements.

9.2.4.1 Public Information
The City distributes public information regarding water issues in mass mailings to all water service customers, through the City's internet site, directly to walk-in customers at City Hall, and at the Public Works Department and the City Community Center. Also, when warranted, time-critical public information is dispersed through the local print media and radio station announcements.

Water use regulations and the annual Consumer Confidence Report are mailed each year to all customers.

The City takes advantage of these mailings to provide its customers additional information on water conservation and other demand management measures. Display cases and bulletin boards at City facilities augment the mailings by providing a permanent posting of the most current City mailings.

The City utility bill distributed to all water service customers is another vehicle used by Atwater for public education purposes. The bill mailing also contains public service announcements that are used to remind citizens of conservation and demand management measures. The City will be developing a system to track its future public information efforts and expenditures.

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2025 Urban Water Management Plan
June 2026
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9.2.4.2 School Education
The City has always welcomed local educational institutions and civic groups to tour City water production facilities and has made staff available for guidance and education during tours as requested. The City also encourages local educators to include demand management education in their curriculum where appropriate and provides materials and staff time for this effort whenever possible.

The effectiveness of the school education program is difficult to measure but educating the students at an early age regarding the value of water conservation and the need to protect the limited resource is essential in having an educated public that will participate in City water conservation programs, mandatory or voluntary. The City will develop a system to track its future school education efforts and expenditures.

9.2.5 Programs to Assess and Manage Distribution System Real Loss The City uses specialized equipment for leak detection as needed and has an ongoing program for maintenance and repair of its distribution system pipelines. The City's Supervisory Control and Data Acquisition system for the water production and distribution facilities provides significantly enhanced capabilities for accurately determining water production quantities. This information is invaluable in performing precise distribution system water audits. Conducting a complete water audit that compares actual water delivered and water produced is not possible at this time since not all connections are metered. The Public Works Department surveys and repairs pipelines on an as-needed basis. The City will begin tracking the amount of pipeline surveyed and repaired each year along with associated costs.

9.2.6 Water Conservation Program Coordination and Staffing Support The City has designated staff to actively develop, promote, enforce, and maintain water conservation programs. These employees are responsible for responding to water complaints, monitoring water waste, issuing warnings and violations, and checking for excess landscape water use.

The effectiveness of this DMM is evaluated in conjunction with the success of the City’s water conservation efforts. As the City grows and water resources become more limited and expensive, the water conservation programs will continue to expand and promote the importance of conservation.

Implementation of this DMM will continue to help the City achieve its water use targets by making implementation of the City’s water conservation program a top priority.

9.2.7 Other Demand Management Measures
In addition to the Demand Management Measures discussed above, the City implements several supplemental conservation programs that contribute to reduced water use, including residential conservation initiatives and large landscape irrigation efficiency programs.

9.2.7.1 Water Survey Programs
Upon request, City personnel will perform an interior and exterior inspection (audit) of a customer’s residence or facility to ascertain potential sources of water waste. City personnel will check for water leaks, nonmandatory control measures will be suggested, and education materials regarding the importance of water conservation will be provided. If available, the City will provide the customer with a water-conservation kit consisting of educational materials, faucet and shower aerators, toilet tank volume

City of Atwater
2025 Urban Water Management Plan
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9-6
displacer, and leak detection tablets. In addition, the City may perform water audits on high-consumption accounts that are flagged during the billing process.

The City will program customer irrigation timers upon request. The City also uses this opportunity to discuss water conservation measures with the customer and give them conservation materials as applicable.

9.2.7.2 Residential Plumbing Retrofit
The City Building Department duties include enforcement of plumbing efficiency standards, which include installation of low-flow water fixtures, as part of the routine plan check procedure. This enforcement process includes specification of appropriate retrofit for low-flow fixtures for remodels. There is no State requirement or City ordinance requiring all residences to retrofit plumbing fixtures with low-flow water fixtures.

9.2.7.3 Landscape Conservation Programs and Incentives
Large landscape water users are designated as commercial for billing purposes and are therefore subject to higher base water rates depending on the meter size. The City tracks high consumption accounts and performs periodic surveys (audits) of the systems as requested or as the accounts are flagged during the billing process due to high consumption.

The City will perform water surveys (audits) for all water customers, including customers with large landscapes, which may include irrigation scheduling assistance and information (Section 9.2.7.1). The City also offers assistance with programming of irrigation timers to its customers with large landscapes (Section 9.2.7.1). During these visits with the customers, the City staff reviews and offers assistance with irrigation scheduling and efficiency and provides the customers with educational materials to assist with these functions and to promote water conservation.

9.2.7.4 High-Efficiency Washing Machine Rebate Program
The City does not offer a rebate program associated with the purchase of high-efficiency clothes washing or dishwashing machines but the electrical service providers, Pacific Gas and Electric and MID have historically offered rebates for clothes washing machines and dishwashing machines.

9.2.7.5 Conservation Programs for Commercial, Industrial, and Institutional A portion of the City’s large commercial, industrial, and institutional water customers are metered and billed monthly. Also, as previously stated, trained City staff are available to conduct water surveys for these customers, including review of all interior and exterior water use. Also, high-consumption users are flagged for further review and possible audit. Water Division staff has the responsibility to educate commercial and industrial users that overuse water for irrigation purposes. The staff can provide a variety of resources to help a commercial or industrial consumer conserve, including staff expertise and written materials. The City’s wastewater treatment plant staff monitors effluent water volume and constituents for treatment purposes but also views this interaction as an opportunity to promote conservation on the discharge side, thereby indirectly promoting conservation on the consumption side.

All City-maintained median strips and traffic islands that require plantings are landscaped with droughttolerant plants. The City maintains a list of approved plantings for public right-of-way. Criteria for inclusion on the list include low water consumption and drought tolerance.

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As part of the normal City plan check process, project plans and specifications are reviewed for conformance with sound water conservation practices and compliance with all codes. Enforceable corrections or modifications are noted and returned with the plans and specifications. The Public Works Department staff member with appropriate expertise communicates non-enforceable recommendations directly to the responsible professional for the project. The project developer is also provided with a copy of the City’s list of approved plantings for public right-of-way. City staff also works with project developers to implement programs to separate potable water systems from irrigation systems whenever feasible.

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2025 Urban Water Management Plan
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10 UWMP Adoption, Submittal, and Implementation
This chapter provides information regarding addressing the CWC requirements for public hearing, the UWMP adoption process, submitting an adopted UWMP and making the document available to the public, plan implementation, and the process for amending an adopted UWMP.

10.1 Inclusion of All 2025 Data
As indicated in Chapter 2, the City uses a calendar year for water supply and demand accounting, and therefore this 2025 UWMP includes data through December 2025.

10.2 Notice of Plan Preparation
Legal Requirements:

CWC Section 10621:
(b) Every urban water supplier required to prepare a plan shall…at least 60 days prior to the public hearing on the plan…notify any city or county within which the supplier provides waters supplies that the urban water supplier will be reviewing the plan and considering amendments or changes to the plan.

As described in Section 2.4 of this plan, the City provided notice of its intent to prepare the 2025 UWMP and WSCP to cities and counties within its service area, as well as to other relevant public agencies that rely on the same water supplies. These notices were distributed on April 7, 2026, more than 60 days prior to adoption, which is in compliance with statutory requirements. Copies of the notices of preparation are included in Appendix C.

10.3 Notice of Public Hearing
Legal Requirements:

Water Code Section 10642:
…Prior to adopting either [the plan or water shortage contingency plan], the urban water supplier shall make both the plan and the water shortage contingency plan available for public inspection and shall hold a public hearing or hearings thereon. Prior to any of these hearings, notice of the time and place of the hearing shall be published within the jurisdiction of the publicly owned water supplier pursuant to Section 6066 of the Government Code [see below]. The urban water supplier shall provide notice of the time and place of a hearing to any city or county within which the supplier provides water supplies Notices by a local public agency pursuant to this section shall be provided pursuant to Chapter 17.5 (commencing with Section 7290) of Division 7 of Title 1 of the Government Code. A privately owned water supplier shall provide an equivalent notice within its service area.

Government Code Section 6066:

Publication of notice pursuant to this section shall be once a week for two successive weeks. Two publications in a newspaper published once a week or oftener, with at least five days intervening between the respective publication dates not counting such publication dates, are sufficient. The period of notice commences upon the first day of publication and terminates at the end of the fourteenth day, including therein the first day.

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2025 Urban Water Management Plan
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The City issued a Notice of Public Hearing and established a public review period prior to the planned adoption date of June 22, 2026, for the 2025 UWMP and WSCP. The notice was issued in accordance with California Government Code Section 6066 and was published in the Merced Sun-Star twice, for two successive weeks with seven days between publication dates. In addition, the notice was posted on the City website.

The Notice of Availability and Public Hearing included the date, time, and location of the public hearing, as well as information on where the draft plans could be reviewed by the public. A copy of the published notice is included in Appendix C.

Hard copies of the Draft 2025 UWMP were made available for public inspection at the City office, and an electronic version of the draft plan was also posted on the City website for public review.

The following interested parties and agencies also received notices of public hearing:
• County of Merced
• Merced Irrigation District
• Merced County Farm Bureau
• Atwater Elementary School District
• Merced Unified School District
Table 10-1 (DWR Table 10-1 Retail) provides confirmation that the notification was provided at least 60 days prior to the public hearing of the plan. Copies of notification letters are included in Appendix C.

Table 10-1 – Notification to Cities and Counties (DWR Table 10-1 Retail) Submittal Table 10-1 Retail: Notification to Cities and Counties Water Code Section 10621(b) and 10642
City Name 60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
Add additional rows as needed
County Name
Drop Down List
60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
Add additional rows as needed
Merced County Yes Yes
NOTES: No additional notes.

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2025 Urban Water Management Plan
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10.4 Public Hearing and Adoption
Legal Requirements:

CWC Section 10642:

Each urban water supplier shall encourage the active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of both the plan and the water shortage contingency plan. Prior to adopting either, the urban water supplier shall make both the plan and the water shortage contingency plan available for public inspection and shall hold a public hearing or hearings thereon…. After the hearing or hearings, the plan or water shortage contingency plan shall be adopted as prepared or as modified after the hearing or hearings.

Government Code Section 7291
…every local public agency… serving a substantial number of non-English-Speaking people, shall employ a sufficient number of qualified bilingual persons in public contact positions or as interpreters to assist those in such positions, to ensure provision of information and services in the language of the nonEnglish-speaking person.

The City has encouraged community involvement in the preparation of the 2025 UWMP and WSCP through public notices published in local newspapers and information posted on the City website. This section summarizes the public hearing process and formal adoption of the UWMP and WSCP.

10.4.1 Public Hearing
On June 22, 2026, the City Council Chambers at 750 Bellevue Road, Atwater, California, hosted a public hearing providing the City water users and members of the general public with an opportunity to review the 2025 UWMP and ask questions regarding the City’s strategies for maintaining a reliable, safe, and high-quality water supply, as well as its approach to managing potential water shortage conditions. The public hearing was held on June 22, 2026, in conjunction with a regularly scheduled City Board meeting.

During the public hearing, the City also presented information regarding its compliance with the Water Conservation Act of 2009, including an overview of baseline water use, water use efficiency targets, current compliance status, the WSCP, and implementation of the UWMP.

10.4.2 Adoption
Following the public hearing, the City Board adopted the 2025 UWMP and the WSCP on June 22, 2026.

The WSCP was adopted through a separate resolution to allow for future updates independent of the UWMP, as needed. Copies of the adopted resolutions are provided in Appendix J.

10.5 Plan Submittal
Legal Requirements:

CWC Section 10621:
(e) Each urban water supplier shall update and submit its 2025 plan to the department by July 1, 2026… CWC Section 10635:
(c) The urban water supplier shall provide that portion of its urban water management plan prepared pursuant to this article to any city or county within which it provides water supplies no later than 60 days after the submission of its urban water management plan.

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2025 Urban Water Management Plan
June 2026
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CWC Section 10644:
(a)(1) An urban water supplier shall submit to the department, the California State Library, and any city or county within which the supplier provides water supplies a copy of its plan no later than 30 days after adoption.

10.5.1 Submitting a UWMP and Water Shortage Contingency Plan to DWR A copy of this 2025 UWMP, including the WSCP, will be submitted electronically to DWR within 30 days of adoption.

10.5.2 Electronic Data Submittal
This 2025 UWMP, including the WSCP and associated data, will be submitted to DWR electronically using the WUEdata submittal tool.

10.5.3 Submitting a UWMP, including WSCP, to the California State Library The 2025 UWMP, including WSCP, will be submitted in electronic or hardcopy format to the California State Library within 30 days of adoption.

10.5.4 Submitting a UWMP to Cities and Counties
The 2025 UWMP, including the WSCP, will be submitted in electronic format to Merced County and other agencies listed in Section 10.3 within 30 days of adoption.

10.6 Public Availability
Legal Requirements:

CWC Section 10645:
(a) Not later than 30 days after filing a copy of its plan with the department, the urban water supplier and the department shall make the plan available for public review during normal business hours. (b) Not later than 30 days after filing a copy of its water shortage contingency plan with the department, the urban water supplier and the department shall make the plan available for public review during normal business hours.

Upon submittal to DWR, this 2025 UWMP will be available for public review at the City’s main office during normal business hours. An electronic copy of this UWMP as well as the WSCP will also be available for review and download on the City’s website (https://www.atwater.org/).

10.7 Notification to Public Utilities Commission
Legal Requirements:

CWC Section 10621 (c):

An urban water supplier regulated by the Public Utilities Commission shall include its most recent plan and water shortage contingency plan as part of the supplier’s general rate case filings.

The City is not regulated by the California Public Utilities Commission.

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2025 Urban Water Management Plan
June 2026
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10.8 Plan Implementation
Legal Requirements:

CWC Section 10643:

An urban water supplier shall implement its plan adopted pursuant to this chapter in accordance with the schedule set forth in its plan.

The 2025 UWMP will serve as the primary reference document for preparation of any SB 610 Water Supply Assessments or SB 221 Water Supply Verifications required for proposed projects between 2026 and 2030 that are subject to the California Environmental Quality Act and would result in water demands equal to or greater than those associated with a 500-dwelling-unit development. In addition, the 2025 UWMP provides guidance for the development of new local water supplies and the continued implementation of water conservation programs and recycled water initiatives necessary to meet future regulatory and conservation requirements.

10.9 Amending an Adopted UWMP or Water Shortage Contingency Plan Legal Requirements:

CWC Section 10621:
(d) The amendments to, or changes in, the plan shall be adopted and filed in the manner set forth in Article 3 (commencing with Section 10640).

CWC Section 10644:
(a)(1) Copies of amendments or changes to the plans shall be submitted to the department, the California State Library, and any city or county within which the supplier provides water supplies within 30 days after adoption.

10.9.1 Amending a UWMP
The plan may be updated at any time when the urban water supplier believes significant changes have occurred in population, land use, and/or water sources that may affect the contents of the plan. If major changes are made to the 2025 UWMP, the City will hold an additional public hearing and City Council will re-adopt the plan. Copies of amendments or changes to the plans will be submitted to DWR, the California State Library, and any city or county within which the supplier provides water supplies within 30 days after adoption.

10.9.2 Amending a Water Shortage Contingency Plan
Legal Requirements:

CWC Section 10644 (b):

If an urban water supplier revises its water shortage contingency plan, the supplier shall submit to the department a copy of its water shortage contingency plan prepared…no later than 30 days after adoption, in accordance with protocols for submission and using electronic reporting tools developed by the department.

If the City revises the WSCP after DWR has approved the 2025 UWMP, copies of amendments or changes to the plans will be submitted electronically to the DWR through the WUEdata Portal within 30 days of its adoption.

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2025 Urban Water Management Plan
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Copies of the amended WSCP will also be sent to the California State Library and any city or county within which the supplier provides water supplies within 30 days after adoption.

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11 References
[1] Atwater General Plan, City of Atwater, Updated in January 2022. [2] 2007 Atwater Water Master Plan Update, City of Atwater, Updated in March 2007. [3] Merced Subbasin Revised Groundwater Sustainability Plan, Merced Irrigation-Urban GSA, adopted July 2022.
[4] California Dept. of Finance Population Estimates. (https://dof.ca.gov) [5] CIMIS Website, Station 148 Merced, Monthly Report, Printed March 2026. (https://cimis.water.ca.gov)
[6] U.S. Census Bureau. "ACS Demographic and Housing Estimates." American Community Survey, ACS 5-Year Estimates Subject Tables, Table DP05,
https://data.census.gov/table/ACSDP5Y2024.DP05?q=Atwater+city,+California. Accessed on May 15, 2026.
[7] U.S. Census Bureau. "Financial Characteristics." American Community Survey, ACS 5-Year Estimates Subject Tables, Table S2503,
https://data.census.gov/table/ACSST5Y2024.S2503?q=Atwater+city,+California. Accessed on May 15, 2026.
[8] 2018 Merced Integrated Regional Water Management Plan Update, Merced Irrigation District, February 2019.

City of Atwater
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June 2026
A
Appendix A
DWR UWMP Tables

CA2410001 City of Atwater 7,821 6,812
Total 7,821 6,812
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Table 2-3.

NOTES: Unit of measure for volumes are in AF.

Add additional rows as needed
Submittal Table 2-1 Retail: Public Water Systems
Public Water System
Number
Public Water System
Name
Number of Municipal
Connections 2025
Volume of Water
Supplied 2025

Select
One or
Both
Name of Regional Alliance or
RUWMP (Drop Down List)
If Water Supplier is also a member of a SB X7-7
Regional Alliance, select name from the drop-down.

Regional Urban Water Management Plan (RUWMP)
If Supplier selected RUWMP, select name from the
drop-down.

NOTES: No additional notes.

Submittal Table 2-2: Plan Identification
Individual UWMP
Type of Plan

Supplier is a wholesale supplier
Supplier is a retail supplier
UWMP Tables are in calendar years
UWMP Tables are in fiscal years
Unit AF
Units of measure used in UWMP
(Select from the drop down list).

DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent
throughout the UWMP as reported in Submittal Table 2-3.

NOTES: No additional notes.

If using fiscal years provide month and date that the fiscal year begins (mm/dd)
Submittal Table 2-3: Supplier Identification
Type of Supplier (select one or both)
Fiscal or Calendar Year (select one)

Submittal Table 2-4 Retail: Water Supplier Information Exchange Water Code Section 10631(h)
The retail Supplier has informed the following wholesale supplier(s) of projected water use.

Wholesale Water Supplier Name
Add additional rows as needed
N/A
NOTES: No additional notes.

2025 2030 2035 2040 2045 2050(opt)
31,862 32,077 32,294 32,512 32,732
NOTES: 2025 population served is from DOF, Report E-5, Table 2 for 1/1/2025. Projected populations assume a growth rate of 0.677% every five years, based on the 5-year growth rate from 2020 - 2025 where population increased from 31,648 to 31,862.

Submittal Table 3-1 Retail: Population - Current and Projected Water Code Section 10631(a)
Population
Served

Use Type
Drop down list
May select each use multiple times
These are the only use types that will be recognized by the WUEdata online submittal tool
Potable or Non-Potable
(OPTIONAL)
Drop down list
Volume
Single Family Potable 3,092
Multi-Family Potable 334
Commercial Builder; Commercial; Utilities;
Construction; Manufacturing; Mining Potable 160
Institutional/Governmental Schools; City facilities Potable 124 Landscape City landscape irrigation Potable 11
Other Unbilled Unmetered Consumption Potable 9
Distribution System Water Loss Potable 3,082
6,812
0 6,812
Additional Description
(as needed)
2025 Actual Water Use
Add additional rows as needed
Subtotal Potable
Subtotal Non-Potable
Total
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

NOTES: Volume of Water Loss for 2025 was estimated based on water supplied and billed meter data and has not been audited. The "Other" water use category accounts for unbilled unmetered water consumption and is estimated as 0.25% of the total billed consumption, in accordance with the AWWA water loss audit form.

Submittal Table 4-1 Retail: Total Uses for Potable and Non-Potable Water — Actual Water Code Section 10631(d)(1)

Use Type
Drop down list
May select each use multiple times
These are the only Use Types that will be recognized
by the WUEdata online submittal tool
Potable or Non-Potable
(OPTIONAL)
Drop down list
2030 2035 2040 2045 2050 opt
Single Family Potable 3,113 3,134 3,156 3,177 -
Multi-Family Potable 336 339 341 343 -
Commercial
Builder; Commercial; Utilities;
Construction; Manufacturing;
Mining
Potable 161 162 163 164 -
Institutional/Governmental Schools; City facilities Potable 124 125 126 127 - Landscape City landscape irrigation Potable 11 11 11 11 - Other Unbilled Unmetered
Consumption
Potable 9 9 9 10
Distribution System Water Loss Potable 160 160 160 160 - 3,915 3,940 3,966 3,991 0
0 0 0 0 0
Total 3,915 3,940 3,966 3,991 0
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

NOTES: Similar to projected population increases, the projected water use values are based on the same percentage increase of 0.677% increase per every 5 years, except to distribution system water loss. For projected future water loss, the City is expecting to meet the 2028 Water Loss Standard set by the state and as such the maximum amount of water loss from the city is 160 AF per year by 2028 values. The "Other" water use category accounts for unbilled unmetered water consumption and is estimated as 0.25% of the total billed consumption, in accordance with the AWWA water loss audit form.

Subtotal Potable
Subtotal Non-Potable
Submittal Table 4-2 Retail: Total Uses for Potable, and Non-Potable Water — Projected Water Code Section 10631(d)(1)
Additional Description
(as needed)
Projected Water Use
(Report To the Extent that Records are Available)
Add additional rows as needed.

Are Future Water Savings Included in Projections?
Drop down list (y/n)
Yes
If "Yes" to above, state the section or page number, in the cell to the right, where citations of the codes, ordinances, or otherwise are utilized in demand projections are found.

Optional Suppliers may complete Optional Submittal Table 4-4 R to quantify the expected savings.
4-6
Are Lower Income Residential Demands Included In Projections? Drop down list (y/n)
Yes
Optional If the method for accounting Lower Income Residential Demands has been included, provide page number where this accounting can be found. 4-8 Submittal Table 4-3 Retail: Inclusion in Water Use Projections Water Code Section 10631 (a), 10631 (d)(4)(A), and 10631 (d)(4)(B) NOTES: No additional notes.

DWR NOTES: Additional guidance is provided in Appendix K.

Public Water System ID # Reported
in Table 2-1 R Reporting Period Submitted to DWR Water Loss Audit Program (yes/no) 2020 Yes
2021 Yes
2022 Yes
2023 Yes
2024 Yes
Submittal Table 4-5 Retail: Water Loss Audit Reporting
Water Code Section 10631(d)(3)(A)
Report submittal status for all five years for each Public Water System as available.

Add rows as needed
CA2410001
DWR NOTES: Suppliers will provide a link to the WUEdata submittals of their Water Loss Audit Reports.

NOTES: Water Loss Audits provided in Appendix D.

2028 Real Water Loss
Standard per Unit per
day
Units for Real
Water Loss
Drop down list
Number of Units
(Connections or Miles
corresponding with
units selected)
Volume of Total Real
Loss (from AWWA
Water Loss Audit)
2028 Apparent
Water Loss Standard
per Unit per Day
Units for
Apparent Water
Loss
Number of
Connections
Volume of Total
Apparent Loss
(from AWWA Water
Loss Audit)
CA2410001 Yes 12.82
Gallons per
Service
Connection per
Day (GPSCD)
7,885 1301.76 147.39 5.45
Gallons per
Service
Connection per
Day (GPSCD)
7,885 73.27 8.30
Submittal Table 4-6 Retail: Progress Towards 2028 Water Loss Standard Water Code Section 10631(d)(3)(C)
Public Water
System ID #
Reported in
Submittal Table
2-1 R
Did the Water Board Calculate a
Water Loss Standard for this
Public Water System? (y/n)
If no, Supplier will not complete
this row.

Real Water Loss Apparent Water Loss
State Water Board Standard Most Recent AWWA Water Loss Audit Real Water
Loss Per Unit
per Day
State Water Board Standard Most Recent AWWA Water Loss Audit Apparent Water
Loss Per Unit per
Day
Add additional rows as needed.

Water Board's Calculated Water Loss Standards
DWR NOTES: Units of measure (AF, CCF, MG) for Water Loss MUST remain consistent with units reported in Submittal Table 2-3. The units reported in Submittal Table 2-3 are used in this table's calculations.

NOTES: FY 2024 Water Loss Audit is used.

Actual 2025 GPCD
(From SB X7-7
Compliance Form)
Did Supplier meet
the 2020 Target in
2025?
No Individual 254 241 Yes NA
Submittal Table 5-1 Retail: SB X7-7 2020 Target Progress Water Code Section 10608.40
Check the box if the Supplier was not an Urban Water Supplier during or before the 2020 UWMP reporting cycle.

Proceed to the next table.

Was Supplier part of
a merger or
consolidation since
2020?
Regional Alliance
Target or
Individual
Target?
Drop down list
2020 Target Actual 2020 GPCD
Did Supplier
Achieve Targeted
Reduction for
2020?
Only for suppliers that did not meet the
Target in 2020
See DWR NOTES below.

DWR NOTES:

Suppliers calculating a 2025 GPCD will need to complete and submit SB X 7-7 Compliance Tables to verify the use of SB X7-7 Methodologies.

Suppliers that were part of a merger or consolidation since 2020 see Chapter 5 and Appendix P for guidance.

NA=Not Applicable
NOTES: 2020 Target GPCD value was met in 2020. 2025 GPCD is not needed to be analyzed.

Groundwater Type
Drop Down List
May use each category
multiple times
Potable or
Non-Potable
(OPTIONAL)
Drop down list
Location or Basin Name 2021 2022 2023 2024 2025
Alluvial Basin Potable Merced Subbasin 8,056 7,348 7,121 6,801 6,812 8,056 7,348 7,121 6,801 6,812
Submittal Table 6-1 Retail: Groundwater Volume Pumped
Water Code Section 10631(4) and 10631(4)(c)
Check the box if the Supplier does not pump groundwater.

Proceed to the next table.

Check the box if all or part of the groundwater described below is desalinated. (OPTIONAL) Add additional rows as needed
Total
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

NOTES: No additional notes.

Name of Wastewater
Collection Agency
Wastewater
Volume Metered
or Estimated?

OPTIONAL
Drop Down List
Volume of Wastewater
Collected from UWMP
Service Area 2025
Name of Wastewater
Treatment Plant (WWTP) and
Place ID Number
Drop down list
Is WWTP Located
Within UWMP
Area?
Drop Down List
City of Atwater Metered 3,504
Atwater Regional WWTF, Place
ID 747519
No
3,504
Add additional rows as needed
Total Wastewater Received from UWMP
Service Area in 2025:

Submittal Table 6-2 Retail: Wastewater Collected Within Service Area Water Code Section 10633(a)
Check the box if there is no wastewater collection system.

Proceed to the next table.

Percentage of 2025 service area served by wastewater collection system (OPTIONAL) Percentage of 2025 service area population served by wastewater collection system (OPTIONAL)
Wastewater Collection Recipient of Collected Wastewater DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

Additional Guidance. See Appendix M, Section M.21 for detailed guidance on this table.

NOTES: Volume of wastewater collected includes wastewater from City of Atwater, Castle Airport, and the Winton Water and Sanitary District (WWSD).

Treatment Level
Drop down list
Volume Treatment Level
Drop down list
Volume Treatment Level
Drop down list
Volume Treatment Level
Drop down list
Volume Treatment Level
Drop down list
Volume Name of other
entity
0 0 0 0 0 0 0
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

IPR: Indirect Potable Reuse would have the treatment level of its end use requirement in the Level of Treatment drop-down.

Additional Guidance. See Appendix M, Section M.21 for detailed guidance on this table.

NOTES: Volume of wastewater treated includes wastewater from City of Atwater, Castle Airport, and the Winton Water and Sanitary District. Disinfected tertiary treated effluent is discharged into the Atwater Drain, which leads to various farming operations and a wildlife refuge area.

Required Discharge for
Instream Flow
(enter data as applicable)
Delivered to Another Entity for Additional
Treatment
(enter data as applicable)
Add additional rows as needed
Total
Submittal Table 6-3 Retail: Wastewater Treatment and Outcomes Within UWMP Service Area Water Code Section 10633(a)
Check the box if no wastewater is treated or disposed of within the UWMP service area.

Proceed to the next table.

Wastewater Treatment
Plant Name and Place ID
Number
Drop down list
Does This Plant
Treat
Wastewater
Generated
Outside the
UWMP Service
Area?
(OPTIONAL)
Drop down list
2025 Volume of
Wastewater
Received from
UWMP Service
Area
(As Reported in
Submittal Table
6-2 R )
Total 2025
Volume of
Water
Treated
2025 Outcomes of Treated Wastewater
Water Recycled Within
UWMP Service Area
(enter data as applicable)
Water Recycled Outside of
UWMP Service Area
(enter data as applicable)
Effluent Discharge that is
not a Permitted Recycled
Water Use
(enter data as applicable)

Volume Narrative page number
(OPTIONAL)
0 6-11; Section 6.1.5.4
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Supplemental Water Added in 2025 (volume) Include units (OPTIONAL) :

Source of 2025 Supplemental Water (OPTIONAL) :

Use Type
Drop down list
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop down list
Additional Information
(as needed)
Potential Recycled Water Use
2030 2035 2040 2045 2050
NOTES: No additional notes.

Subtotal Potable
Subtotal Non-Potable
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

Additional Guidance: See Appendix M, Section M.21 for detailed guidance on this table.

Potential recycled water use: a description of the feasibility of these uses must be included in the narrative.

Multiple Producers: If you have multiple recycled water producers, submit a separate table for each.

Add additional rows as needed
Total
Submittal Table 6-4 Retail: Recycled Water Direct Beneficial Uses Within Service Area Water Code Section 10633 (c),(d),(e)
Check box if recycled water is not used and is not planned for use within the service area of the supplier. The supplier will only complete the column on "Potential Recycled Water Use" and submit an accompanying narrative on the feasibility of that potential recycled water use.

Name(s) of Facility/ies Producing (Treating) the Recycled Water (OPTIONAL) :

Name of Supplier Operating the Recycled Water Distribution System (OPTIONAL) :
2025

2020 Projection
for 2025
2025 Actual
Use
0 0
Use Type
Drop Down list
Submittal Table 6-5 Retail: 2020 UWMP Recycled Water Use Projection Compared to 2025 Actual
Water Code Section 10633 (e)
Check the box if recycled water was not used in 2025 nor previously projected for use in 2020.

Proceed to the next table.

Add additional rows as needed
NOTES: No additional notes.

Total
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure reported in Submittal Table 2-3 Additional Guidance. See Appendix M, Section M.21 for detailed guidance on this table.

6-11
Name of Action Description Expected Increase in Recycled Water Use
0 0
Add additional rows as needed
Submittal Table 6-6 Retail: Methods to Encourage Future Recycled Water Use Water Code Section 10633 (f)
Check the box if the Supplier does not plan to expand recycled water use in the future. Supplier will not complete the table below but will provide narrative explanation.

Provide page location of narrative in the UWMP
DWR NOTES:

Units of measure (AF, CCF, MG) MUST remain consistent with units reported in Submittal Table 2-3. The units reported in Submittal Table 2-3 are used in this table's calculations.

The unit conversion to Acre Feet addresses the Water Code's requirement that this value be provided in acre-feet.

NOTES: No additional notes.

Planned Implementation Year
Total
Unit Conversion to AF

Drop Down
List
(yes/no)
If Yes, Supplier Name
Provide page location of narrative in the UWMP
Name of Future Projects
or Programs
Joint Project with other suppliers?
Additional Description
(as needed)
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop Down list
Planned
Implementation
Year
Planned for Use in
Year Type
Drop Down List
Expected
Increase in
Water Supply
to Supplier
(This may be a
range)
Add additional rows as needed
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure reported in Submittal Table 2-3.

NOTES: No additional notes.

Submittal Table 6-7 Retail: Expected Future Water Supply Projects or Programs Water Code Section 10631 (f)
Check the box if there are no expected future water supply projects or programs that provide a quantifiable increase to the agency's water supply.

Procees to the next table.

Check the box if some or all of the supplier's future water supply projects or programs are not compatible with this table and are described in a narrative format.

Water Supply
Drop down list
May use each category multiple times.

These are the only water supply
categories that will be recognized by the
WUEdata online submittal tool
Potable or Non-Potable
(after treatment if
treated)
(OPTIONAL)
Drop Down list
Actual Volume
Total Entitlement
(OPTIONAL)
See 'DWR Notes' below
Groundwater (not desalinated) Merced Subbasin Potable 6,812 6,812 0
0 0
6,812 0
Submittal Table 6-8 Retail: Water Supplies — Actual
Water Code Section 10631(b)
Additional Description
(as needed)
2025
Add additional rules as needed
Subtotal Potable
Subtotal Non-Potable
Total
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.

Total Entitlement: e.g. Water Right, Groundwater Allocation, Contracted Amount.

NOTES: No additional notes.

Water Supply
Reasonably
Available
Volume
Total Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total Entitlement
(OPTIONAL)
See "DWR Notes"
below
Reasonably
Available
Volume
Total Entitlement
(OPTIONAL)
See "DWR Notes"
below
Groundwater (not
desalinated)
Merced
Subbasin Potable 3,915 3,940 3,966 3,991
3,915 0 3,940 0 3,966 0 3,991 0 0 0
0 0 0 0 0 0 0 0 0 0
3,915 0 3,940 0 3,966 0 3,991 0 0 0
Additional
Detail on
Water
Supply
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop Down list
Projected Water Supply (Report to the Extent Practicable) Drop down list
May use each category multiple
times. These are the only water
supply categories that will be
recognized by the WUEdata online
submittal tool
2030 2035 2040 2045 2050 (opt)
Add additional rows as needed
Subtotal Potable
Subtotal Non-Potable
Total
DWR NOTES:

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

Total Entitlement: e.g. Water Right, Groundwater Allocation, Contracted Amount.

NOTES: As the City receives it's water supply from a groundwater source, the projected supply available is equal to the projected demands.

Submittal Table 6-9 Retail: Water Supplies — Projected
Water Code Section 10631 (b)

% of Average Supply
Average Year 2009 100%
Single-Dry Year 2015 70%
Consecutive Dry Years 1st Year 2014 70%
Consecutive Dry Years 2nd Year 2015 70%
Consecutive Dry Years 3rd Year 2016 70%
Consecutive Dry Years 4th Year 2017 80%
Consecutive Dry Years 5th Year 2018 90%
OPTIONAL Submittal Table 7-1 Retail: Basis of Water Year Data (Reliability Assessment) Year Type
Base Year
If not using a calendar
year, type in the last
year of the fiscal,
water year, or range
of years, for example,
water year 2024-
2025, use 2025
Available Supplies if
Year Type Repeats
Check the box if quantification of available supplies is not compatible with this table and is provided elsewhere in the UWMP.

Location: Not Applicable
Quantification of available supplies is provided in this table as either volume only, percent only, or both.

Volume Available
DWR NOTES: Supplier may use multiple versions of Submittal Table 7-1 R if different water sources have different base years and the supplier chooses to report the base years for each water source separately. If a Supplier uses multiple versions of Submittal Table 7-1 R, in the "Note" section of each submittal table, state that multiple versions of Submittal Table 7-1 R are being used and identify the particular water source that is being reported in each submittal table.

Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table reports the units of measure reported in Submittal Table 2-3.

NOTES: Volume available was estimated based on the volume pumped for the base year listed. % of Average Water Supply is rounded to the nearest 10%.
9,259

2030 2035 2040 2045 2050 (Opt)
Supply totals
(autofill from Submittal Table 6-
9 R)
3,915 3,940 3,966 3,991 0
Use totals
(autofill from Submittal Table 4-
2 R)
3,915 3,940 3,966 3,991 0
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation
benefit
WSCP - use reduction savings
benefit
Revised Surplus/(shortfall)
Submittal Table 7-2 Retail: Normal Year Supply and Use Comparison Water Code Section 10635 (a)
OPTIONAL Planned WSCP Actions
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: No additional notes.

2030 2035 2040 2045 2050 (Opt)
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply
augmentation benefit
WSCP - use reduction
savings benefit
Revised Surplus/(shortfall)
OPTIONAL Planned WSCP Actions
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: As the City receives it's water supply from a groundwater source, the projected supply available is equal to the projected demands.

Submittal Table 7-3 Retail: Single Dry Year Supply and Use Comparison Water Code Section 10635(a)

2030 2035 2040 2045 2050 (Opt)
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 2,740 2,758 2,776 2,794 -
Use totals 2,740 2,758 2,776 2,794 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 3,132 3,152 3,173 3,193 -
Use totals 3,132 3,152 3,173 3,193 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 3,523 3,546 3,569 3,592 -
Use totals 3,523 3,546 3,569 3,592 -
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Third year OPTIONAL Planned WSCP Actions
First year
Second year OPTIONAL Planned WSCP Actions
Fifth year OPTIONAL Planned WSCP Actions
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

Fourth year OPTIONAL Planned WSCP Actions
NOTES: Refer to Table 7-3 for explanation of Supply and Use Totals equal to each other. Refer to Table 7-1 for factor reductions on a yearly basis during multiple dry years.

OPTIONAL Planned WSCP Actions
Submittal Table 7-4 Retail: Multiple Dry Years Supply and Use Comparison Water Code Section 10635(a)

2026 Total
Total Water Use 4,090
Total Supplies 4,090
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
2027 Total
Total Water Use 3,411
Total Supplies 3,411
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
2028 Total
Total Water Use 2,733
Total Supplies 2,733
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
2029 Total
Total Water Use 3,128
Total Supplies 3,128
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
2030 Total
Total Water Use 3,523
Total Supplies 3,523
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Submittal Table 7-5 Retail: Five-Year Drought Risk Assessment Water Code Section 10635(b)(3)
OPTIONAL Planned WSCP Actions (use reduction and supply augmentation)
OPTIONAL Planned WSCP Actions (use reduction and supply augmentation)
OPTIONAL Planned WSCP Actions (use reduction and supply augmentation)
OPTIONAL Planned WSCP Actions (use reduction and supply augmentation)
OPTIONAL Planned WSCP Actions (use reduction and supply augmentation)
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Refer to Table 7-3 for explanation of Supply and Use Totals equal to each other. Refer to Table 7-1 for factor reductions on a yearly basis during multiple dry years.

Standard
Shortage
Levels
Percent Shortage
Range
Suppliers
Shortage
Levels
Percent
Shortage Range
1 Up to 10%
2 Up to 20%
3 Up to 30%
4 Up to 40%
5 Up to 50%
6 >50%
Submittal Table 8-1: Cross-reference for Standard vs
Supplier Shortage Levels
Water Code Section 10632(a)(3)(B)
Check the box if the Supplier uses the Standard
six levels of water shortage.

Proceed to the next table.

NOTES: Shortage Response Level 1 includes prohibition of outdoor water wasting activities, timely leak repair
requirements, and education campaigns.

Shortage Response Level 2 includes an increase of landscape irrigation limits.

Shortage Response Level 3 includes prohibition of the use of water which cause flooding, vehicle washing limitations, and no street cleaning.

Shortage Response Level 4 includes prohibition of a landscape irrigation.

Shortage Response Level 5 includes a requirement of water served upon request at restaurants, commercial lodging
establishment limitation, and decorative water feature
limitations.

Yes
Volume or
Percentage
Drop down
Shortage Gap
Reduction Value
(May be a range)
1-6 Other Actions Percentage 1-10%
Decrease line flushing. The City decreases the
frequency and duration of water system
flushing maintenance activities.
1-6 Other Actions Percentage 1-10%
Reduce system water loss. The City increases
efforts to correct water system losses,
including repairing leaks and eliminating illicit
connections.
1-6 Other Actions Percentage 1-10%
Increase water waste patrols. The City
conducts more frequent patrols to discourage
water wasting and correct water wasting
practices in the community.
1-6 Other Actions Percentage 1-10%
Increase frequency of meter reading. The City
may increase frequency of meter reading to
better track services that may have leaks or
usually high water consumption.

Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Supply Augmentation Methods and
Other Actions by Water Supplier
Drop down list
These are the only categories that will be
accepted by the WUEdata online submittal tool
How much is this going to reduce the
shortage gap?
Additional Explanation or Reference
(OPTIONAL)
Add additional rows as needed
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Shortage Levels 1-6 Supply Augmentation Actions are going to reduce the shortage gap up to the full shortage amount hence the Shortage Gap Reduction Value as a range. For example: If the City is mandating shortage level 3 demand reduction actions and are only reducing the amount of water usage by 27%, this supply augmentation actions will assist in reaching the specified reduction value.

Submittal Table 8-2 Retail: Supply Augmentation and Other Actions Water Code Section 10632(a)(4)(A),(C) and (E)

Yes
Volume or Percentage
Drop down
Shortage Gap
Reduction Value
(May be a range)
1 Expand Public Information Campaign Volume
Supports other
demand reduction
actions
Increases awareness of water shortage levels and
community's responsibility in abiding by set
reduction actions from the City. The City distributes
public information regarding water issues in mass
mailing to all water services customers, through the
City's Internet site, directly to walk-in customers at
City Hall, and at the Public Works Department and
the City Community Center.

No
1 Improve Customer Billing Volume
Supports other
demand reduction
actions
The City encourages water conservation through its
water and sewer service rate structure. No
1 Other Volume
Supports other
demand reduction
actions
Offers water use surveys. Upon request, the City
personnel will perform an interior and exterior
inspection of a customer's residence or facility in
order to ascertain potential sources of water waste.

No
1 Other - Customers must repair leaks,
breaks, and malfunctions in a timely
manner
Volume
Supports other
demand reduction
actions
Repair all water leaks within five (5) days of
notification by the City Public Works Department
unless other arrangements are made with the City
Public Works Dept.

Yes
1 Other - Require automatic shut of
hoses Volume
Supports other
demand reduction
actions
Use a hand-held hose equipped with a positive shutoff nozzle or bucket to water landscaped areas. Yes 1 Other Volume
Supports other
demand reduction
actions
Wash vehicle using a bucket, not exceeding 5 gallons
in capacity. Avoid washing during hot conditions
when additional water is required due to
evaporation.

Yes
1 Other - Prohibit use of potable water
for washing hard surfaces Volume
Supports other
demand reduction
actions
Exception allowed for alleviating safety or sanitation
hazards, in which case, areas shall be washed from
water contained in a bucket or container not
exceeding 5 gallons in capacity.

Yes
1 Other Volume 20 gpcd Complete installation of water meters to service connections.

No
1 Other Volume
Supports other
demand reduction
actions
Moratorium or net zero demand increase on new
connections. The City will temporarily limit or ban
new water service connections within the service
area.

Yes
2 Landscape - Limit landscape irrigation
to specific days Volume 25 gpcd 3 days/week. Yes
2 Landscape - Limit landscape irrigation
to specific times Volume
Supports other
demand reduction
actions
Customers shall not irrigate any lawn or landscape
area between the hours of 10:00 am and 5:00 pm on
any day of the week.

Yes
3 Landscape - Limit landscape irrigation
to specific days Volume 30 gpcd 2 days/week Yes
4 Landscape - Limit landscape irrigation
to specific days Volume 30 gpcd 1 day/week Yes
5-6
Landscape - Limit landscape irrigation
to specific days Volume 30 gpcd Prohibit all landscape irrigation. Yes 5-6
Water Features - Restrict water use for
decorative water features, such as
fountains
Volume
Supports other
demand reduction
actions
Stop operating ornamental fountains or similar
decorative water features unless recycled water is
used.

Yes
5-6
CII - Restaurants may only serve water
upon request
Volume
Supports other
demand reduction
actions
Serve and refill water in restaurants and other food
service establishments only upon request. Yes
5-6
Other water feature or swimming pool
restriction
Volume
Supports other
demand reduction
actions
Initial filling of swimming pools or otherwise of the
full capacity of a pool over 2,500 gallons is
prohibited. Emptying and refilling all pools is
prohibited.

Yes
5-6
CII - Lodging establishment must offer
opt out of linen service Volume
Supports other
demand reduction
actions
Offers guests in hotels, motels, and other
commercial lodging establishments the option of not
laundering towels and linens daily.

Yes
Submittal Table 8-3 Retail: Demand Reduction Actions
Water Code Section 10632(a)(4)(B) and (E)
Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction Actions
Drop down list
These are the only categories that will be
accepted by the WUEdata online submittal
tool. Select those that apply.

How much is this going to reduce the shortage
gap?
Additional Explanation or Reference
(OPTIONAL)
Penalty, Charge, or
Other
Enforcement?
For Retail Suppliers Only
Drop Down List
Add additional rows as needed

DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Shortage Gap Reduction Value units are in gpcd to effectively depict the volume of shortage on a per capita basis. For the first violation, the consumer shall be issued an administrative citation with a warning. For the second violation, the consumer shall be issued an administrative citation in the amount of $50. For the third violation, the consumer shall be issued an administrative citation in the amount of $75. For the fourth violation, the consumer shall be issued an administrative citation in the amount of $250.

City Name 60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
County Name
Drop Down List
60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
Merced County Yes Yes
Submittal Table 10-1 Retail: Notification to Cities and Counties Water Code Section 10621(b) and 10642
Add additional rows as needed
Add additional rows as needed
NOTES: No additional notes.

City of Atwater
2025 Urban Water Management Plan
June 2026
B
Appendix B
DWR UWMP Checklist

Retail
(x = required)
Wholesale
(x = required) Order 2025 Guidebook Location Water Code Section Summary as Applies to UWMP Subject Relevant Submittal Table 2025 UWMP Location x x 1 Chapter 1 10615 A plan shall describe and evaluate sources of supply, reasonable and practical efficient uses, reclamation  and demand management activities. Introduction and overview n/a Section 1.1 Page 1-1 x x 1 Chapter 1 10630.5
Each plan shall include a simple description of the Supplier’s plan including water availability, future requirements, a strategy for meeting needs, and other pertinent information. Additionally, a Supplier may also choose to include a simple description at the beginning of each chapter.

Plan preparation n/a Section 1.6 Page 1-4
x x 2.1 Section 2.1 10620(b) Every person that becomes a Supplier shall adopt UWMP within one year after it has become a Supplier. Plan preparation n/a Section 2.1.1 Page 2-1 x n/a 2.5 Section 2.5 10644 Supplier shall report the Public Water Systems number, volume of delivered water, and number of  connections that are included in this UWMP. Plan preparation 2-1 Section 2.1.1 Page 2-1 x x 2.5 Section 2.5 10644 Supplier shall report if this UWMP is an individual UWMP and whether the Supplier belongs to a regional  UWMP or regional alliance. Plan preparation 2-2 Section 2.2 Page 2-2x x 2.5 Section 2.5 10644 Supplier shall report whether the data is in fiscal or calendar years and the units of measure used for  reporting water volumes. Plan preparation 2-3 Section 2.3 Page 2-2x x 2.4 Section 2.4 10642 Provide supporting documentation that the Supplier has encouraged active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of the plan and contingency plan.

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

Plan preparation n/a Section 2.4 Page 2-3
x n/a 2.4 Section 2.4.1 10631(h) Retail Suppliers will include documentation that they have provided their Wholesale Supplier(s)—if  any—with water use projections from that source. Plan preparation 2-4 R Section 2.4.1 Page 2-4 n/a x 2.4 Section 2.4.1 10631(h)
Wholesale Suppliers will provide their Suppliers with identification and quantification of the existing and planned sources of water available from the Wholesale Supplier to the Supplier during various water year types.

Plan preparation 2-4 W N/A
x x 3 Chapter 3.0 10631(a) Describe the Supplier service area. System description n/a Section 3.2 Page 3-2x x 3.3 Section 3.3 10631(a) Describe the climate of the Supplier’s service area. System description n/a Section 3.3 Page 3-5 x x 3.4 Section 3.4.1 10631(a) Provide the current and projected service area populations for 2030, 2035, 2040, 2045 and optionally  2050. System description 3-1 Section 3.4.1 Page 3-6 x x 3.4 Section 3.4.2 10631(a) Describe other social, economic, and demographic factors affecting the Supplier’s water management  planning. System description n/a Section 3.4.2 Page 3-6 x x 3.5 Section 3.5 10631(a)
Describe the land uses within the service area… include the current and projected land uses within the existing or anticipated service area affecting the Supplier’s water management planning. Describe the land uses within the service area.

System description and baselines n/a Section 3.5 Page 3-7 x Optional 4.2 Sections 4.2.3 and 4.2.4 10631(d)(1) Quantify past, current, and projected water use, identifying the uses among water use sectors. System water use 4-1 and 4-2 Section 4.2 Page 4-1x Optional 4.3 Section 4.3.1 10631(d)(3)(A) Report the distribution system water loss for each of the five years preceding the plan update. System water use 4-5 Section 4.3 Page 4-9 x n/a 4.3 Section 4.3.2 10631(d)(3)(C) Retail Suppliers shall provide data to show the distribution loss standards were met. System water use 4-6 Section 4.4 Page 4-10x n/a 4.2 Section 4.2.5.4 10631.1(a) Include projected water use needed for lower income housing projected in the service area of the  Supplier. System water use 4-3 Section 4.2.6 Page 4-7 x n/a 4.2 Section 4.2.5.3 10631(d)(4)(A) In projected water use, include estimates of water savings from adopted codes, plans, and other policies  or laws. System water use 4-3 Section 4.2.6 Page 4-7x n/a 4.2 Section 4.2.5.3 10631(d)(4)(B) Provide citations of codes, standards, ordinances, or plans used to make water use projections. System water use 4-3 Section 4.2.6 Page 4-7x n/a 4.2 Section 4.2.5.3 10631(d)(4)(B)(ii) To the extent that a Supplier reports the information described in subparagraph (A), an urban water Supplier shall… Indicate the extent that the water use projections consider savings from codes, standards, ordinances, or transportation and land use plans. Water use projections that do not account for these water savings shall be noted of that fact.

System water use 4-3 Section 4.2.6 Page 4-7
x x 4.2 Section 4.2.5.6 10635(b) Demands under climate change considerations must be included as part of the drought risk assessment. System water use n/a Section 4.2.7 Page 4-8 n/a x 5.1 Section 5.1 10608.36 Wholesale Suppliers shall include an assessment of present and proposed future measures, programs,  and policies to help their Retail Suppliers achieve targeted water use reductions. Baselines and targets n/a N/A x n/a 5.2 Section 5.2 10608.4
Retail Suppliers shall report on their compliance in meeting their water use targets. Reporting requirements will vary depending on whether the Supplier:- Was considered an urban retail water supplier in 2020,- Met its 2020 target in 2020, or- Was part of a merger or consolidation since 2020.Chapter 5 Subsections 5.2.1, 5.2.2, and 5.2.3 address each of these situations.

Baselines and targets 5-1 Section 5.1 Page 5-1
x x 6.1 Section 6.1 10631(b)(2) When multiple sources of water supply are identified, describe the management of each supply in  relationship to other identified supplies. System supplies n/a Section 6.1 Page 6-1 x x 6.1 Sections 6.1 and 6.2 10631(b)(1)
Provide a discussion of anticipated supply availability under a normal, single dry year, and a drought lasting five years, as well as more frequent and severe periods of drought, including changes in supply due to climate change.

System supplies n/a Section 6.1.11 Page 6-19
x x 6.2 Section 6.2.2 10631(b)(4)(C)
Indicate whether groundwater is an existing or planned source of water available to the Supplier. If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.

Water supplies and recycled water 6-1 Section 6.1.2 Page 6-2 x x 6.2 Section 6.2.2 10631(b)(4)(A)
Indicate whether a groundwater sustainability plan or groundwater management plan has been adopted by the Supplier or if there is any other specific authorization for groundwater management. Include a copy of the plan or authorization.

System supplies n/a Section 6.1.2.1 Page 6-3
x x 6.2 Section 6.2.2 10631(b)(4)(B) Describe the groundwater basin. System supplies n/a Section 6.1.2.1 Page 6-3 x x 6.2 Section 6.2.2 10631(b)(4)(B) Indicate if the basin has been adjudicated and include a copy of the court order or decree and a  description of the amount of water the Supplier has the legal right to pump. System supplies n/a Section 6.1.2.1 Page 6-3 x x 6.2 Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… (include) information as to whether DWR has identified the basin as a high-  or medium-priority basin in the most current official departmental bulletin… Water supplies and recycled  water n/a Section 6.1.2.1 Page 6-3 x x 6.2 Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… describe efforts by the Supplier to coordinate with sustainability or  groundwater agencies to achieve sustainable groundwater conditions. Water supplies and recycled  water n/a Section 6.1.2.1 Page 6-3

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

System supplies n/a Section 6.1.2 Page 6-2
x x 6.2 Section 6.2.2 10631(b)(4)(D) Provide a detailed description and analysis of the amount and location of groundwater that is projected  to be pumped. System supplies 6-9 Section 6.1.10.2 Page 6-17 x x 6.1 Section 6.1 10631(b) Identify and quantify the existing and planned sources of water available for 2025, 2030, 2035, 2040,  2045 and optionally 2050. System supplies 6-8 and 6-9 Section 6.1.10.2 Page 6-17 x x 6.2 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 n/a Section 6.1.7 Page 6-14x n/a 6.2 Section 6.2.5 10633(a) Describe the wastewater collection and treatment systems in the Supplier’s service area with quantified  amount of collection and treatment and the disposal methods. System supplies (recycled water) 6-2 Section 6.1.5.2 Page 6-8 x x 6.2 Section 6.2.5 10633(b) Describe the quantity of treated wastewater that meets recycled water standards, is being discharged,  and is otherwise available for use in a recycled water project. System supplies (recycled water) 6-3 Section 6.1.5.2 Page 6-8x x 6.2 Section 6.2.5 10633(c) Describe the recycled water currently being used in the Supplier's service area. System supplies (recycled water) 6-4 Section 6.1.5.3 Page 6-11 x x 6.2 Section 6.2.5 10633(d) Describe and quantify the potential uses of recycled water and provide a determination of the technical  and economic feasibility of those uses. System supplies (recycled water) 6-4 Section 6.1.5.4 Page 6-11 x x 6.2 Section 6.2.5 10633(e) Describe the projected use of recycled water within the Supplier's service area at the end of 5, 10, 15,  and 20 years, and describe the actual use of recycled water in comparison to uses previously projected. System supplies (recycled water) 6-4 and 6-5 Section 6.1.5.4 Page 6-11 x x 6.2 Section 6.2.5 10633(f) Describe the actions that may be taken to encourage the use of recycled water and the projected results  of these actions in terms of acre-feet of recycled water used per year. System supplies (recycled water) 6-6 Section 6.1.5.5 Page 6-13 x x 6.2 Section 6.2.5 10633(g) Provide a plan for optimizing the use of recycled water in the Supplier's service area. System supplies (recycled water) n/a Section 6.1.5.5 Page 6-13 x x 6.2 Section 6.2.6 10631(g) Describe desalinated water project opportunities for long-term supply. System supplies 6-7 Section 6.1.6 Page 6-14 x x 6.2 Section 6.2.10 10631(f)
Describe the expected future water supply projects and programs that may be undertaken by the water Supplier to address water supply reliability in average, single-dry, and for a period of drought lasting five consecutive water years.

System supplies 6-7 Section 6.1.9 Page 6-15
x x 6.3 Section 6.3 and Appendix O 10631.2(a) The UWMP must include energy information, as stated in the code, that a Supplier can readily obtain. System suppliers, energy  intensity O-1A, O-1B, O-1C, and O-2 Section 6.2 Page 6-19 x 7.1 Section 7.1 10634 Provide information on the quality of existing sources of water available to the Supplier and the manner  in which water quality affects water management strategies and supply reliability. Water supply reliability  assessment n/a Section 7.1.3 Page 7-2 x x 7.2 Section 7.2 10635(a)
Service Reliability Assessment: Assess the water supply reliability during normal, dry, and a drought lasting five consecutive water years by comparing the total water supply sources available to the Supplier with the total projected water use over the next 20 years.

Water supply reliability assessment 7-2, 7-3, and 7-4 Section 7.2 Page 7-2 x x 7.2 Section 7.2.3 10620(f) Describe water management tools and options to maximize resources and minimize the need to import  water from other regions. Water supply reliability  assessment n/a Section 7.2.3 Page 7-6 x x 7.3 Section 7.3 10635(b) Provide a drought risk assessment as part of information considered in developing the demand  management measures and water supply projects. Water supply reliability  assessment n/a Section 7.3 Page 7-7x x 7.3 Section 7.3 10635(b)(1) Include a description of the data, methodology, and basis for one or more supply shortage conditions that are necessary to conduct a drought risk assessment for a drought period that lasts five consecutive years.

Water supply reliability assessment n/a Section 7.3.1 Page 7-7 x x 7.3 Section 7.3 10635(b)(2) Include a determination of the reliability of each source of supply under a variety of water shortage  conditions. Water supply reliability  assessment n/a Section 7.3.2 Page 7-7 x x 7.3 Section 7.3 10635(b)(3) Include a comparison of the total water supply sources available to the Supplier with the total projected  water use for the drought period. Water supply reliability  assessment 7-5 Section 7.3.3 Page 7-8x x 7.3 Section 7.3 10635(b)(4) Include considerations of the historical drought hydrology, plausible changes on projected supplies and demands under climate change conditions, anticipated regulatory changes, and other locally applicable criteria.

Water supply reliability assessment n/a Section 7.3.3 Page 7-8 x x 8 Chapter 8 10632(a) Provide a water shortage contingency plan (WSCP) with specified elements below. Water shortage contingency  planning n/a Appendix G x x 8 Chapter 8 10632(a)(1) Provide an analysis of water supply reliability (from Guidebook Chapter 7) in the WSCP. Water shortage contingency  planning n/a Appendix G Section 2 Page 3x x 8.2 Section 8.2 10632(a)(2)(A) Provide the written decision-making process and other methods that the Supplier will use each year to  determine its water reliability. Water shortage contingency  planning n/a Appendix G Section 3.1 Page 6x x 8.2 Section 8.2 10632(a)(2)(B) Provide data and methodology to evaluate the Supplier’s water reliability for the current year and one  dry year pursuant to factors in the code. Water shortage contingency  planning n/a Appendix G Section 3.2 Page 7x x 8.3 Section 8.3 10632(a)(3)(A) Define six standard water shortage levels of 10%, 20%, 30%, 40%, 50% shortage, and greater than 50% shortage. These levels shall be based on supply conditions, including percent reductions in supply, changes in groundwater levels, changes in surface elevation, or other conditions. The shortage levels shall also apply to a catastrophic interruption of supply.

Water shortage contingency planning n/a Appendix G Section 4 Page 10 x x 8.3 Section 8.3 10632(a)(3)(B) Suppliers with an existing WSCP that uses different water shortage levels must cross reference their  categories with the six standard categories. Water shortage contingency  planning 8-1 Appendix G Section 4 Page 10 x x 8.4 Section 8.4 10632(a)(4)(A) Suppliers with WSCPs that align with the defined shortage levels must specify locally appropriate supply  augmentation actions. Water shortage contingency  planning 8-2 Appendix G Section 5.1 Page 13x x 8.4 Section 8.4 10632(a)(4)(B) Specify locally appropriate demand reduction actions to adequately respond to shortages. Water shortage contingency  planning 8-3 Appendix G Section 5.2 Page 15x x 8.4 Section 8.4 10632(a)(4)(C) Specify locally appropriate operational changes. Water shortage contingency  planning 8-2 Appendix G Section 5.3 Page 23x x 8.4 Section 8.4 10632(a)(4)(D) Specify additional mandatory prohibitions against specific water use practices that are in addition to  State-mandated prohibitions are appropriate to local conditions. Water shortage contingency  planning Table 8-3 Appendix G Section 5.4 Page 23 x x 8.4 Section 8.4 10632(a)(4)(E) Estimate the extent to which the gap between supplies and demand will be reduced by implementation  of the action. Water shortage contingency  planning 8-2 and 8-3 Appendix G Section 5.2 Page 15x x 8.4 Section 8.4.6 10632.5 The UWMP shall include a seismic risk assessment and mitigation plan. Water shortage contingency plan n/a Appendix G Section 5.6 Page 24 x x 8.5 Section 8.5 10632(a)(5)(A) Suppliers must describe that they will inform customers, the public and others regarding any current or  predicted water shortages. Water shortage contingency  planning n/a Appendix G Section 6 Page 27 x x 8.5 Section 8.5 10632(a)(5)(B),  10632(a)(5)(C) Suppliers must describe that they will inform customers, the public and others regarding any shortage  response actions triggered or anticipated to be triggered and other relevant communications. Water shortage contingency  planning n/a Appendix G Section 6 Page 27 x n/a 8.6 Section 8.6 10632(a)(6) Retail Supplier must describe how it will ensure compliance with and enforce provisions of the WSCP. Water shortage contingency  planning n/a Appendix G Section 7 Page 29

x x 8.7 Section 8.7 10632(a)(7)(A) Describe the legal authority that empowers the Supplier to enforce shortage response actions. Water shortage contingency  planning n/a Appendix G Section 8 Page 30 x x 8.7 Section 8.7 10632(a)(7)(B) Provide a statement that the Supplier will declare a water shortage emergency per Water Code  Chapter 3. Water Shortage Emergencies. Water shortage contingency  planning n/a Appendix G Section 8 Page 30x x 8.7 Section 8.7 10632(a)(7)(C) Provide a statement that the Supplier will coordinate with any city or county within which it provides  water for the possible proclamation of a local emergency. Water shortage contingency  planning n/a Appendix G Section 8 Page 30x x 8.8 Section 8.8 10632(a)(8)(A) Describe the potential revenue reductions and expense increases associated with activated shortage  response actions. Water shortage contingency  planning n/a Appendix G Section 9 Page 31x x 8.8 Section 8.8 10632(a)(8)(B) Provide a description of mitigation actions needed to address revenue reductions and expense increases  associated with activated shortage response actions. Water shortage contingency  planning n/a Appendix G Section 9 Page 31x n/a 8.8 Section 8.8 10632(a)(8)(C) Retail Suppliers must describe the cost of compliance with Water Code Chapter 3.3, Excessive Residential Water Use During Drought. Water shortage contingency  planning n/a Appendix G Section 9 Page 31x n/a 8.9 Section 8.9 10632(a)(9) Retail Suppliers must describe the monitoring and reporting requirements and procedures that ensure  appropriate data are collected, tracked, and analyzed for purposes of monitoring customer compliance. Water shortage contingency  planning n/a Appendix G Section 10 Page 32 x x 8.10 Section 8.10 10632(a)(10) Describe reevaluation and improvement procedures for monitoring and evaluation the WSCP to ensure  risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented. Water shortage contingency  planning n/a Appendix G Section 11 Page 33 x n/a 8.11 Section 8.11 10632(b) Analyze and define water features that are artificially supplied with water, including ponds, lakes,  waterfalls, and fountains, separately from swimming pools and spas. Water shortage contingency  planning n/a Appendix G Section 12 Page 34 x x 8.12 Section 8.12 10632(c) Make available the WSCP to customers and any city or county where it provides water within 30 days  after adoption of the plan. Water shortage contingency  planning n/a Appendix G Section 13 Page 35x n/a 9.1 Sections 9.1 10631(e)(1) Retail Suppliers shall provide a description of the nature and extent of each demand management measure implemented over the past five years. The description will address specific measures listed in code.

Demand management measures n/a Section 9.1.1 Page 9-1
n/a x 9.2 Sections 9.2 10631(e)(2) Wholesale Suppliers shall describe specific demand management measures listed in code, their  distribution system asset management program, and Supplier assistance program. Demand management measures n/a N/A x n/a 10 Chapter 10 10608.26(a) Retail Suppliers shall conduct a public hearing to discuss adoption, implementation, and economic  impact of water use targets (recommended to discuss compliance). Plan adoption, submittal, and  implementation n/a Section 10.4 Page 10-3 x x 10.2 Section 10.2.1 10621(b)
Notify, at least 60 days prior to the public hearing, any city or county within which the Supplier provides water that the Supplier will be reviewing the UWMP and considering amendments or changes to the plan.

Plan adoption, submittal, and implementation 10-1 Section 10.3 Page 10-1 x x 10.4 Section 10.4 10621(f) Each urban water Supplier shall update and submit its 2025 plan  to DWR by July 1, 202 6. Plan adoption, submittal, and  implementation n/a Section 10.5.1 Page 10-4 x x 10.2 Sections 10.2.2, 10.3, and 10.5 10642 Provide supporting documentation that the Supplier made the UWMP and WSCP available for public  inspection, published notice of the public hearing, and held a public hearing about the UWMP and WSCP. Plan adoption, submittal, and  implementation n/a Section 10 Page 10-1 x x 10.2 Section 10.2.2 10642 The Supplier is to provide the time and place of the hearing to any city or county within which the  Supplier provides water. Plan adoption, submittal, and  implementation 10-1 Section 10.3 Page 10-1 x x 10.3 Section 10.3.2 10642 Provide supporting documentation that the UWMP and WSCP has been adopted as prepared or modified. Plan adoption, submittal, and  implementation n/a Section 10.4.2 Page 10-3x x 10.4 Section 10.4 10644(a) Provide supporting documentation that the Supplier has submitted their UWMP to the California State  Library. Plan adoption, submittal, and  implementation n/a Section 10.5.3 Page 10-4x x 10.4 Section 10.4 10644(a)(1) Provide supporting documentation that the Supplier has submitted their UWMP to any city or county  within which the Supplier provides water no later than 30 days after adoption. Plan adoption, submittal, and  implementation n/a Section 10.5.4 Page 10-4x x 10.4 Sections 10.4.1 and 10.4.2 10644(a)(2) The UWMP, or amendments to the UWMP, submitted to DWR shall be submitted electronically. Plan adoption, submittal, and  implementation n/a Section 10.9.1 Page 10-5x x 10.7 Section 10.7.2 10644(b) If revised, submit a copy of the WSCP to DWR within 30 days of adoption. Plan adoption, submittal, and  implementation n/a Section 10.9.1 Page 10-5x x 10.5 Section 10.5 10645(a) Provide supporting documentation that, not later than 30 days after filing a copy of its UWMP with DWR,  the Supplier has or will make the plan available for public review during normal business hours. Plan adoption, submittal, and  implementation n/a Section 10.6 Page 10-4 x x 10.5 Section 10.5 10645(b) Provide supporting documentation that, not later than 30 days after filing a copy of its WSCP with DWR,  the Supplier has or will make the plan available for public review during normal business hours. Plan adoption, submittal, and  implementation n/a Section 10.6 Page 10-4 x x 10.6 Section 10.6 10621(c) If Supplier is regulated by the Public Utilities Commission, include its plan and contingency plan as part  of its general rate case filings. Plan adoption, submittal, and  implementation n/a Section 10.7 Page 10-4

City of Atwater
2025 Urban Water Management Plan
June 2026
C
Appendix C
Agency and Public Notices

City of Atwater
2025 Urban Water Management Plan
June 2026
D
Appendix D
Water Loss Audits
(2020-2024)

Water Audit Report for:

Reporting Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:

Volume from own sources: 5 2,782.297 MG/Yr 3 MG/Yr
Water imported: n/a 0.000 MG/Yr MG/Yr
Water exported: n/a 0.000 MG/Yr MG/Yr
Enter negative % or value for under-registration
WATER SUPPLIED: 2,782.297 MG/Yr Enter positive % or value for over-registration .

AUTHORIZED CONSUMPTION
Billed metered: 3 1,264.018 MG/Yr
Billed unmetered: 3 1,195.137 MG/Yr
Unbilled metered: n/a 0.000 MG/Yr Pcnt: Value:

Unbilled unmetered: 5 34.779 MG/Yr 1.25% 24061 MG/Yr
AUTHORIZED CONSUMPTION: 2,493.934 MG/Yr
WATER LOSSES (Water Supplied - Authorized Consumption) 288.363 MG/Yr Apparent Losses Pcnt: Value:

Unauthorized consumption: 6.956 MG/Yr 0.25% MG/Yr
Customer metering inaccuracies: 3 12.768 MG/Yr 1.00% MG/Yr Systematic data handling errors: 5 0.000 MG/Yr 0.25% MG/Yr Apparent Losses: 19.724 MG/Yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 268.640 MG/Yr WATER LOSSES: 288.363 MG/Yr

NON-REVENUE WATER
NON-REVENUE WATER: 323.142 MG/Yr
= Water Losses + Unbilled Metered + Unbilled Unmetered

SYSTEM DATA
Length of mains: 9 97.6 miles
Number of active AND inactive service connections: 9 7,881 Service connection density: 81 conn./mile main
Yes
Average length of customer service line: 10 ft
Average operating pressure: 5 50.0 psi

COST DATA
Total annual cost of operating water system: 10 $4,888,986 $/Year Customer retail unit cost (applied to Apparent Losses): 5 $1.68 Variable production cost (applied to Real Losses): 5 $378.15 $/Million gallons WATER AUDIT DATA VALIDITY SCORE:

PRIORITY AREAS FOR ATTENTION:
1: Volume from own sources
2: Billed metered
3: Billed unmetered
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/1000 gallons (US)
Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 48 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 Systematic data handling errors are likely, please enter a positive, non-zero value; otherwise grade = 1 (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
Default option selected for Unbilled unmetered - a grading of 5 is applied but not displayed 2020-2021 7/2020 - 6/2021
City of Atwater (CA2410001)
<----------- Enter grading in column 'E' and 'J' ----------> ?
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? Click to access definition
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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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?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.

Copyright © 2014, All Rights Reserved.
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+
+
+
+
+
+
+
+
+
+
+
+
+
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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.

Use Customer Retail Unit Cost to value real losses
AWWA Free Water Audit Software v5.0 Reporting Worksheet 2

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 4 2,550.941 MG/Yr n g 8 percent MG/Yr under-registration VOSEA WI Water Imported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 2,550.941 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 930.870 MG/Yr
BUAC Billed Unmetered: n g 2 690.560 MG/Yr
UMAC Unbilled Metered: n g n/a 0.000 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 4.054 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 1,625.484 MG/Yr
WATER LOSSES 925.457 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 4.054 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 9.403 MG/Yr 1.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 4.054 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

17.510 MG/Yr
Real Losses
907.948 MG/Yr
925.457 MG/Yr

NON-REVENUE WATER
929.511 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 97.6 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 7,881 (active and inactive) Service connection density: 81 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 5 50.0 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $1.85
VPC Variable Production Cost: n g 9 $473.07 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Billed Unmetered (BUAC) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet
City of Atwater
Jul 01 2021 - Jun 30 2022
Water Supplied Error Adjustments
2022 Fiscal
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$4,982,023
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

Copyright © 2020, All Rights Reserved.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 2

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 4 2,234.849 MG/Yr n g 4 percent MG/Yr under-registration VOSEA WI Water Imported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 2,234.849 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 959.041 MG/Yr
BUAC Billed Unmetered: n g 2 715.174 MG/Yr
UMAC Unbilled Metered: n g n/a 0.000 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 4.186 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 1,678.400 MG/Yr
WATER LOSSES 556.449 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 4.186 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 9.687 MG/Yr 1.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 4.186 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

18.058 MG/Yr
Real Losses
538.391 MG/Yr
556.449 MG/Yr

NON-REVENUE WATER
560.635 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 97.6 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 7,885 (active and inactive) Service connection density: 81 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 5 50.0 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $2.04
VPC Variable Production Cost: n g 9 $605.35 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Billed Unmetered (BUAC) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet
City of Atwater
Jul 01 2022 - Jun 30 2023
Water Supplied Error Adjustments
2023 Fiscal
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$5,368,942
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

Copyright © 2020, All Rights Reserved.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 2

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 4 2,294.162 MG/Yr n g 8 volume MG/Yr over-registration VOSEA WI Water Imported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 2,249.359 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 1,056.150 MG/Yr
BUAC Billed Unmetered: n g 2 602.334 MG/Yr
UMAC Unbilled Metered: n g n/a 0.000 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 4.146 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 1,662.630 MG/Yr
WATER LOSSES 586.729 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 4.146 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 10.668 MG/Yr 1.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 4.146 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

18.961 MG/Yr
Real Losses
567.768 MG/Yr
586.729 MG/Yr

NON-REVENUE WATER
590.875 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 97.6 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 10 7,885 (active and inactive) Service connection density: 81 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 5 50.0 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $2.04
VPC Variable Production Cost: n g 8 $589.69 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Billed Unmetered (BUAC) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$5,472,089
Total Annual Operating Cost
Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet
City of Atwater

44.803
Jul 01 2023 - Jun 30 2024
Water Supplied Error Adjustments
2023 Fiscal
Real Losses:

WATER LOSSES:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

Copyright © 2020, All Rights Reserved.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 2

Water Audit Report for:

Audit Year:

All volumes to be entered as: MILLION GALLONS (US) PER YEAR WATER SUPPLIED choose entry option:

VOS Volume from Own Sources: n g 4 2,239.800 MG/Yr n g 8 percent MG/Yr under-registration VOSEA WI Water Imported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WIEA WE Water Exported: n g n/a 0.000 MG/Yr n g n/a percent MG/Yr select….. WEEA 2,239.800 MG/Yr
.

AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 8 1,479.008 MG/Yr
BUAC Billed Unmetered: n g 2 308.268 MG/Yr
UMAC Unbilled Metered: n g n/a 0.000 MG/Yr choose entry option:

UUAC Unbilled Unmetered: n g 3 4.468 MG/Yr 0.25% default MG/Yr 24061 Default option selected for Unbilled Unmetered, with automatic data grading of 3 1,791.744 MG/Yr
WATER LOSSES 448.056 MG/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:

SDHE Systematic Data Handling Errors: n g 3 4.468 MG/Yr 0.25% default MG/Yr CMI Customer Metering Inaccuracies: n g 2 14.939 MG/Yr 1.00% percent MG/Yr under-registration UC Unauthorized Consumption: n g 3 4.468 MG/Yr 0.25% default MG/Yr Default option selected for Unauthorized Consumption, with automatic data grading of 3

23.876 MG/Yr
Real Losses
424.180 MG/Yr
448.056 MG/Yr

NON-REVENUE WATER
452.524 MG/Yr

SYSTEM DATA
Lm Length of mains: n g 10 97.6 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 7,885 (active and inactive) Service connection density: 81 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 ft (average distance between property line and meter) AOP Average Operating Pressure: n g 5 50.0 psi

COST DATA
CRUC Customer Retail Unit Charge: n g 10 $2.04
VPC Variable Production Cost: n g 9 $762.00 $/Million gallons $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:

Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Volume from Own Sources (VOS) Unit Total Losses: gal/conn/day 2: Billed Unmetered (BUAC) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:

Worksheet
City of Atwater
Jul 01 2024 - Jun 30 2025
Water Supplied Error Adjustments
2025 Fiscal
Real Losses:

WATER LOSSES:

Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/1000 gallons (US)
$6,248,780
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:

If entering an
Error Adjustment,
select under- or overregistration
WATER SUPPLIED:

AUTHORIZED CONSUMPTION:

Apparent Losses:

Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.

To access definitions, click the input name
To edit water system info:

AWWA Free Water Audit Software v6.0 Worksheet 1

City of Atwater
2025 Urban Water Management Plan
June 2026
E
Appendix E
Energy Use Tables

Water Delivery Product
drop down list
(If delivering more than one type of product recommend using Table O-1C)
Retail Potable
Deliveries
Start Date of Reporting Period 1/1/2025
End Date of Reporting Period 12/31/2025
Is upstream embedded energy in the values reported? No
Units of Measure for Water AF Total Utility
See DWR NOTES Hydropower Net Utility
6,812 - 6,812
5,095,834 - 5,095,834
2,296 - 2,296
Quantity of Self-Generated Renewable Energy
0 kWh
Data Quality (Estimate, Metered Data, Combination of Estimates and Metered Data)Metered DataData Quality Narrative:

Narrative:(1) An estimate of the amount of energy used to extract or divert water supplies. 10631.2. (a) In addition to the requirements of Section 10631, an urban water management plan shall include any of the following information that the urban water supplier can readily obtain:

Optional Submittal Table O-1B: Recommended Energy Reporting - SINGLE DELIVERY PRODUCT - TOTAL UTILITY APPROACH Only for Water Delivery Products Under the Urban Water Supplier's Operational Control
Sum of All Water Management
Processes Non-Consequential Hydropower
Volume of Water Entering Process
Energy Consumed (kWh)
Energy Intensity (kWh/vol. converted to MG)
DWR NOTES: Total Utility:The volume of water entered in the “Total Utility” column should equal the volume of water entering the distribution system (excluding recycled water); in most cases, this is the total volume calculated in UWMP Table 4-1: 2025 Actual Total Uses for Potable and Non-Potable Water. Note if recycled water is included in your Submittal Table 4-1, you must exclude it from your volume in this table. The volume of water is the total amount of groundwater pumped in 2025. The total amount of energy used in 2025 was provided by the City.Energy is consumed during well pumping.NOTES: No additional notes.10631.2 (b) The Department shall include in its guidance for the preparation of urban water management plans a methodology for the voluntary calculation or estimation of the energy intensity of urban water systems. (2) An estimate of the amount of energy used to convey water supplies to the water treatment plants or distribution systems. (3) An estimate of the amount of energy used to treat water supplies. (4) An estimate of the amount of energy used to distribute water supplies though its distribution systems. (5) An estimate of the amount of energy used for treated water supplies in comparison to the amount used for nontreated water supplies. (6) An estimate of the amount of energy used to place water into or withdraw from storage. (7) Any other energy-related information the urban water supplier deems appropriate.

Start Date of Reporting Period 1/1/2025
End Date of Reporting Period 12/31/2025
Is upstream embedded energy in the values reported? No
Units of Measure for Water AF Collection / Conveyance Treatment Discharge / Distribution Total 0 3,504 0 3,504
0 4,885,779 0 4,885,779
0 4,280 0 4,280
0 0 0 0
0 0 0 0
0 0 0 0
Quantity of Self-Generated Renewable Energy related to recycled water and wastewater operations
0 kWh
Data Quality (drop down)
Metered Data
Data Quality Narrative:Narrative:NOTES: No additional notes.

Wastewater Energy Intensity (kWh/volume converted to MG) Volume of Wastewater Entering Process (volume units selected above) Wastewater Energy Consumed (kWh)
Volume of Recycled Water Entering Process (volume units selected above) Recycled Water Energy Consumed (kWh)
Recycled Water Energy Intensity (kWh/volume converted to MG) Optional Submittal Table O-2: Recommended Energy Reporting - WASTEWATER AND RECYCLED WATER Only for Water Delivery Products Under the Urban Water
Supplier's Operational Control
Water Management Process
The volume of wastewater and the total amount of energy used in 2025 was provided by the City.Energy is consumed during pumping and treatment as the wastewater treatment plant.

City of Atwater
2025 Urban Water Management Plan
June 2026
F
Appendix F
Consumer Confidence Reports
(2021-2024)

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SWS CCR Revised January 2023
2022 Consumer Confidence Report
Water System Information
Water System Name: City of Atwater
Report Date: 05/01/2023
Type of Water Source(s) in Use: Groundwater
Name and General Location of Source(s): Wells 13,14,15,16,17,18,19, and 21; Within City Limits Drinking Water Source Assessment Information: Community Time and Place of Regularly Scheduled Board Meetings for Public Participation: Second and Fourth Monday of every month at 6:00 P.M. at the Atwater Council Chambers For More Information, Contact: (209) 357-6370
About This Report
We test the drinking water quality for many constituents as required by state and federal regulations.

This report shows the results of our monitoring for the period of January 1 to December 31, 2022 and may include earlier monitoring data.

Importance of This Report Statement in Five Non-English Languages (Spanish, Mandarin, Tagalog, Vietnamese, and Hmong)
Este informe contiene información muy importante sobre su agua para beber. Favor de comunicarse City of Atwater a (209) 357-6370 para asistirlo en español. 这份报告含有关于您的饮用水的重要讯息。请用以下地址和电话联系 City of Atwater 以获得中文的帮
助: 470 Aviator Dr, Atwater, CA (209) 357-6370.

Ang pag-uulat na ito ay naglalaman ng mahalagang impormasyon tungkol sa inyong inuming tubig.

Mangyaring makipag-ugnayan sa City of Atwater 470 Aviator Dr, Atwater, CA o tumawag sa (209) 357-6370 para matulungan sa wikang Tagalog.

Báo cáo này chứa thông tin quan trọng về nước uống của bạn. Xin vui lòng liên hệ City of Atwater tại (209) 357-6370 để được hỗ trợ giúp bằng tiếng Việt.

Tsab ntawv no muaj cov ntsiab lus tseem ceeb txog koj cov dej haus. Thov hu rau City of Atwater ntawm (209) 357-6370 rau kev pab hauv lus Askiv.

Terms Used in This Report
Term Definition
Level 1 Assessment A Level 1 assessment is a study of the water system to identify potential problems and determine (if possible) why total coliform bacteria have been found in our water system.

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SWS CCR Revised January 2023
Term Definition
Level 2 Assessment A Level 2 assessment is a very detailed study of the water system to identify potential problems and determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have been found in our water system on multiple occasions.

Maximum Contaminant
Level (MCL)
The highest level of a contaminant that is allowed in drinking water.

Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.

Maximum Contaminant
Level Goal (MCLG)
The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the U.S.

Environmental Protection Agency (U.S. EPA).

Maximum Residual
Disinfectant Level
(MRDL)
The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

Maximum Residual
Disinfectant Level Goal
(MRDLG)
The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.

Primary Drinking Water
Standards (PDWS)
MCLs and MRDLs for contaminants that affect health along with their monitoring and reporting requirements, and water treatment requirements.

Public Health Goal
(PHG)
The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.

Regulatory Action Level
(AL)
The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.

Secondary Drinking
Water Standards
(SDWS)
MCLs for contaminants that affect taste, odor, or appearance of the drinking water. Contaminants with SDWSs do not affect the health at the MCL levels.

Treatment Technique
(TT)
A required process intended to reduce the level of a contaminant in drinking water.

Variances and
Exemptions
Permissions from the State Water Resources Control Board (State Board) to exceed an MCL or not comply with a treatment technique under certain conditions.

ND Not detectable at testing limit.
ppm parts per million or milligrams per liter (mg/L)
ppb parts per billion or micrograms per liter (µg/L)
ppt parts per trillion or nanograms per liter (ng/L)
ppq parts per quadrillion or picogram per liter (pg/L)
pCi/L picocuries per liter (a measure of radiation)

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SWS CCR Revised January 2023
Sources of Drinking Water and Contaminants that May Be Present in Source Water
The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.

Contaminants that may be present in source water include:
• Microbial contaminants, such as viruses and bacteria, that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. • Inorganic contaminants, such as salts and metals, that can be naturally-occurring or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming.
• Pesticides and herbicides, that may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.
• Organic chemical contaminants, including synthetic and volatile organic chemicals, that are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, agricultural application, and septic systems. • Radioactive contaminants, that can be naturally-occurring or be the result of oil and gas production and mining activities.

Regulation of Drinking Water and Bottled Water Quality
In order to ensure that tap water is safe to drink, the U.S. EPA and the State Board prescribe regulations that limit the amount of certain contaminants in water provided by public water systems.

The U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that provide the same protection for public health.

About Your Drinking Water Quality
Drinking Water Contaminants Detected
Tables 1, 2, 3, 4, 5, 6, and 8 list all of the drinking water contaminants that were detected during the most recent sampling for the constituent. The presence of these contaminants in the water does not necessarily indicate that the water poses a health risk. The State Board allows us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of the data, though representative of the water quality, are more than one year old. Any violation of an AL, MCL, MRDL, or TT is asterisked. Additional information regarding the violation is provided later in this report.

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SWS CCR Revised January 2023
Table 1. Sampling Results Showing the Detection of Coliform Bacteria Complete if bacteria are detected.

Microbiological
Contaminants
Highest No.
of
Detections
No. of
Months in
Violation
MCL MCLG Typical Source
of Bacteria
E. coli (In the year)
0 0 (a) 0 Human and
animal fecal
waste
(a) Routine and repeat samples are total coliform-positive and either is E. coli-positive or system fails to take repeat samples following E. coli-positive routine sample or system fails to analyze total coliform-positive repeat sample for E. coli.

Table 2. Sampling Results Showing the Detection of Lead and Copper Complete if lead or copper is detected in the last sample set. Lead and Copper Sample Date No. of Samples Collected 90th Percentile Level Detected No. Sites Exceeding AL AL PHG No. of Schools
Requesting
Lead SamplingTypical Source
of
Contaminant
Lead
(ppb)
07/12/2022 34 ND 0 15 0.2 [Enter No.] Internal corrosion of household water plumbing
systems; discharges from
industrial manufacturers;
erosion of natural deposits
Copper
(ppm)
07/12/2022 34 .220 0 1.3 0.3 Not
applicable
Internal corrosion of
household plumbing
systems; erosion of natural
deposits; leaching from
wood preservatives
Table 3. Sampling Results for Sodium and Hardness
Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections MCL PHG(MCLG)
Typical Source of
Contaminant
Sodium (ppm) 11/29/21 34 22/47 None None Salt present in the water and is generally
naturally occurring
Hardness (ppm) 11/29/21 78 28/150 None None Sum of polyvalent cations present in the
water, generally
magnesium and

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SWS CCR Revised January 2023
calcium, and are
usually naturally
occurring
Table 4. Detection of Contaminants with a Primary Drinking Water Standard Chemical or
Constituent
(and
reporting units)
Sample
Date
Level
Detected
Range of
Detections
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
Typical Source
of
Contaminant
Arsenic (µg/L) 11/29/21 4.7 ND/7.6 10 .004 Erosion of
natural
deposits; runoff
from orchards ;
glass and
electronics
wastes
Barium (mg/L) 11/29/21 .109 .048/.150 1 2 Discharge of oil drilling wastes
and from metal
refineries;
erosion of
natural deposits
Nitrate (mg/L) 10/11/22 4.3 1.7/8.1 10 10 Runoff and
leaching from
fertilizer use;
leaching from
septic tanks
and sewage;
erosion of
natural deposits
Fluoride (mg/L) 11/29/21 .10 .052/.16 2 1 Erosion of
natural
deposits; water
additive which
promotes
strong teeth;
discharge from
fertilizer and
aluminum
factories
Atrazine (µg/L) 1/25/21 .025 ND/.20 1 .15 Runoff from
herbicide used
on row crops
and along
railroad

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SWS CCR Revised January 2023
Gross Alpha
Particle Activity
(pCi/L)
3/23/23 7.35 5.98/8.71 15 0 Erosion of
natural deposits
Radium (pCi/L) 3/11/15 .18 ND/1.4 5 .019 Erosion of
natural deposits
Dibromochloroprop
ane [DBCP] (mg/L)
4/27/22 62 ND/120 200 1.7 Banned
nematocide that
may still be
present in soils
due to
runoff/leaching
from former use
on soybeans,
cotton,
vineyards,
tomatoes, and
tree fruit
TTHMs [Total
Trihalomethanes]
(µg/L)
9/13/22 .2 ND/.66 80 N/A Byproduct of
drinking water
disinfection
HAA5 [Sum of 5
Haloacetic Acids]
(µg/L)
9/13/22 .2 N/D/.59 60 N/A Byproduct of
drinking water
disinfection
Uranium (pCi/L) 12/5/15 2.6 ND/10.7 20 .43 Erosion of
natural deposits
Chlorine 12/27/22 .75 .64/.84 4 4 Drinking water
disinfectant
added for
treatment
1,2,3-
Trichloropropane
(µg/L)
12/06/22 59 1.2/130 5 .7 Discharge from
industrial and
agricultural
chemical
factories;
leaching from
hazardous
waste sites;
used as
cleaning and
maintenance
solvent, paint
and varnish
remover and
cleaning and
degreasing
agent;
byproduct

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SWS CCR Revised January 2023
during the
production of
other
compounds and
pesticides
Table 5. Detection of Contaminants with a Secondary Drinking Water Standard Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections SMCL PHG(MCLG)
Typical Source
of
Contaminant
Aluminum (µg/L) 11/29/21 6.8 ND/54 200 N/A Erosion of natural deposits; residual
from some surface
water treatment
processes
Color (Units) 11/29/21 1.25 1/2 15 N/A Naturally-occurring organic materials
Turbidity (Units) 11/29/21 .19 ND/.29 5 N/A Soil Runoff Total Dissolved
Solids [TDS]
(mg/L)
11/29/21 246 200/300 1000 N/A Runoff/leaching
from natural
deposits
Specific
Conductance
(µS/cm)
11/29/21 335 240/435 1600 N/A Substances that
form ions when in
water; seawater
influence
Chloride 11/29/21 12 6.1/17 500 N/A Runoff/leaching
from natural
deposits; seawater
influence
Sulfate 11/29/21 12 6.9/19 500 N/A Runoff/leaching
from natural
deposits; industrial
wastes
Table 6. Detection of Unregulated Contaminants
Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections
Notification
Level Health Effects
None
Additional General Information on Drinking Water

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SWS CCR Revised January 2023
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. EPA’s Safe Drinking Water Hotline (1-800-426-4791).

Some people may be more vulnerable to contaminants in drinking water than the general population.

Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. U.S. EPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (1-800-426-4791).

Lead-Specific Language: If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. [Enter Water System’s Name] is responsible for providing high quality drinking water but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. [Optional: If you do so, you may wish to collect the flushed water and reuse it for another beneficial purpose, such as watering plants.] If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline (1-800- 426-4791) or at http://www.epa.gov/lead.

Additional Special Language for Nitrate, Arsenic, Lead, Radon, and Cryptosporidium: [Enter Additional Information Described in Instructions for SWS CCR Document] State Revised Total Coliform Rule (RTCR): [Enter Additional Information Described in Instructions for SWS CCR Document]
Summary Information for Violation of a MCL, MRDL, AL, TT, or Monitoring and Reporting Requirement
Table 7. Violation of a MCL, MRDL, AL, TT or Monitoring Reporting Requirement Violation Explanation Duration Actions Taken to
Correct Violation
Health Effects
Language
None

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SWS CCR Revised January 2023
For Water Systems Providing Groundwater as a Source of Drinking Water Table 8. Sampling Results Showing Fecal Indicator-Positive Groundwater Source Samples Microbiological
Contaminants
(complete if fecalindicator detected)
Total No. of
Detections
Sample
Dates
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
Typical Source of
Contaminant
E. coli 2022
0 0 (0) Human and animal fecal
waste
Enterococci 2022
0 TT N/A Human and animal fecal
waste
Coliphage 2022
0 TT N/A Human and animal fecal
waste

Consumer Confidence Report Page 1 of 11
SWS CCR Revised January 2025
2024 Consumer Confidence Report
Water System Information
Water System Name: City of Atwater
Report Date: 5/28/25
Type of Water Source(s) in Use: Groundwater
Name and General Location of Source(s): Wells 13,14,15,16,17,18,19, and 21; Within City Limits Drinking Water Source Assessment Information: Community Time and Place of Regularly Scheduled Board Meetings for Public Participation: Second and Fourth Monday of every month at 6:00 P.M. at the Atwater Council Chambers For More Information, Contact: (209) 357-6370
About This Report
We test the drinking water quality for many constituents as required by state and federal regulations.

This report shows the results of our monitoring for the period of January 1 to December 31, 2024, and may include earlier monitoring data.

Importance of This Report Statement in Five Non-English Languages (Spanish, Mandarin, Tagalog, Vietnamese, and Hmong)
Language in Spanish: Este informe contiene información muy importante sobre su agua para beber.

Favor de comunicarse City of Atwater a (209) 357-6370 para asistirlo en español.

Language in Mandarin: 这份报告含有关于您的饮用水的重要讯息。请用以下地址和电话联系 City of Atwater以获得中文的帮助: 470 Aviator Dr, Atwater, CA (209) 357-6370.

Language in Tagalog: Ang pag-uulat na ito ay naglalaman ng mahalagang impormasyon tungkol sa inyong inuming tubig. Mangyaring makipag-ugnayan sa City of Atwater 470 Aviator Dr, Atwater, CA o tumawag sa (209) 357-6370 para matulungan sa wikang Tagalog.

Language in Vietnamese: Báo cáo này chứa thông tin quan trọng về nước uống của bạn. Xin vui lòng liên hệ City of Atwater tại (209) 357-6370 để được hỗ trợ giúp bằng tiếng Việt.

Language in Hmong: Tsab ntawv no muaj cov ntsiab lus tseem ceeb txog koj cov dej haus. Thov hu rau City of Atwater ntawm (209) 357-6370 rau kev pab hauv lus Askiv.

Terms Used in This Report
Term Definition
Level 1 Assessment A Level 1 assessment is a study of the water system to identify potential problems and determine (if possible) why total coliform bacteria have been found in our water system.

Consumer Confidence Report Page 2 of 11
SWS CCR Revised January 2025
Term Definition
Level 2 Assessment A Level 2 assessment is a very detailed study of the water system to identify potential problems and determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have been found in our water system on multiple occasions.

Maximum Contaminant
Level (MCL)
The highest level of a contaminant that is allowed in drinking water.

Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.

Maximum Contaminant
Level Goal (MCLG)
The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the U.S.

Environmental Protection Agency (U.S. EPA).

Maximum Residual
Disinfectant Level
(MRDL)
The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

Maximum Residual
Disinfectant Level Goal
(MRDLG)
The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.

Primary Drinking Water
Standards (PDWS)
MCLs and MRDLs for contaminants that affect health along with their monitoring and reporting requirements, and water treatment requirements.

Public Health Goal
(PHG)
The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.

Regulatory Action Level
(AL)
The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.

Secondary Drinking
Water Standards
(SDWS)
MCLs for contaminants that affect taste, odor, or appearance of the drinking water. Contaminants with SDWSs do not affect the health at the MCL levels.

Treatment Technique
(TT)
A required process intended to reduce the level of a contaminant in drinking water.

Variances and
Exemptions
Permissions from the State Water Resources Control Board (State Board) to exceed an MCL or not comply with a treatment technique under certain conditions.

ND Not detectable at testing limit.
ppm parts per million or milligrams per liter (mg/L)
ppb parts per billion or micrograms per liter (µg/L)
ppt parts per trillion or nanograms per liter (ng/L)
ppq parts per quadrillion or picogram per liter (pg/L)
pCi/L picocuries per liter (a measure of radiation)

Consumer Confidence Report Page 3 of 11
SWS CCR Revised January 2025
Sources of Drinking Water and Contaminants that May Be Present in Source Water
The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.

Contaminants that may be present in source water include:
• Microbial contaminants, such as viruses and bacteria, that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. • Inorganic contaminants, such as salts and metals, that can be naturally-occurring or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming.
• Pesticides and herbicides, that may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.
• Organic chemical contaminants, including synthetic and volatile organic chemicals, that are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, agricultural application, and septic systems. • Radioactive contaminants, that can be naturally-occurring or be the result of oil and gas production and mining activities.

Regulation of Drinking Water and Bottled Water Quality
In order to ensure that tap water is safe to drink, the U.S. EPA and the State Board prescribe regulations that limit the amount of certain contaminants in water provided by public water systems.

The U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that provide the same protection for public health.

About Your Drinking Water Quality
Drinking Water Contaminants Detected
Tables 1, 2, 3, 4, 5, 6, and 8 list all of the drinking water contaminants that were detected during the most recent sampling for the constituent. The presence of these contaminants in the water does not necessarily indicate that the water poses a health risk. The State Board allows us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of the data, though representative of the water quality, are more than one year old. Any violation of an AL, MCL, MRDL, or TT is asterisked. Additional information regarding the violation is provided later in this report.

Consumer Confidence Report Page 4 of 11
SWS CCR Revised January 2025
Table 1. Sampling Results Showing the Detection of Coliform Bacteria Complete if bacteria are detected.

Microbiological
Contaminants
Highest No.
of
Detections
No. of
Months in
Violation
MCL MCLG Typical Source
of Bacteria
E. coli No
Detections
0 (a) 0 Human and
animal fecal
waste
(a) Routine and repeat samples are total coliform-positive and either is E. coli-positive or system fails to take repeat samples following E. coli-positive routine sample or system fails to analyze total coliform-positive repeat sample for E. coli.

Table 2. Sampling Results Showing the Detection of Lead and Copper Complete if lead or copper is detected in the last sample set. Lead and Copper Sample Date No. of Samples Collected 90th Percentile Level Detected No. Sites Exceeding AL AL PHG
Typical Source
of
Contaminant
Lead
(ppb)
07/12/22 34 ND 0 15 0.2 Internal corrosion of household water plumbing systems;
discharges from industrial
manufacturers; erosion of
natural deposits
Copper
(ppm)
07/12/22 34 .220 0 1.3 0.3 Internal corrosion of household plumbing systems; erosion of
natural deposits; leaching from
wood preservatives
Table 3. Sampling Results for Sodium and Hardness
Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections MCL PHG(MCLG)
Typical Source of
Contaminant
Sodium (ppm) 11/26/24 32 22/43 None None Salt present in the water and is generally
naturally occurring
Hardness (ppm) 11/26/24 79 39/140 None None Sum of polyvalent cations present in the
water, generally
magnesium and
calcium, and are

Consumer Confidence Report Page 5 of 11
SWS CCR Revised January 2025
usually naturally
occurring
Table 4. Detection of Contaminants with a Primary Drinking Water Standard Chemical or
Constituent
(and
reporting units)
Sample
Date
Level
Detected
Range of
Detections
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
Typical Source
of
Contaminant
Arsenic (µg/L) 11/26/24 3.7 ND/6.8 10 .004 Erosion of
natural
deposits; runoff
from orchards;
glass and
electronics
production
wastes
Barium (mg/L) 11/26/24 .110 .071/.150 1 2 Discharges of oil drilling
wastes and
from metal
refineries;
erosion of
natural deposits
Chromium
(hexavalent) (µg/L)
11/26/24 2.6 1.5/4.5 10 .02 Erosion of
natural
deposits;
transformation
of naturally
occurring
trivalent
chromium to
hexavalent
chromium by
natural
processes and
human
activities such
as discharges
from
electroplating
factories,
leather
tanneries, wood
preservation,
chemical
synthesis,

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SWS CCR Revised January 2025
refractory
production, and
textile
Fluoride (mg/L) 11/26/24 .16 .12/.21 2.0 1 Erosion of
natural
deposits; water
additive that
promotes
strong teeth;
discharge from
fertilizer and
aluminum
factories
Nitrate (mg/L) 11/26/24 4.2 1.7/6.5 10 10 Runoff and
leaching from
fertilizer use;
leaching from
septic tanks
and sewage;
erosion of
natural deposits
Perchlorate (µg/L) 11/26/24 .3 ND/1.2 6 1 Perchlorate is an inorganic
chemical used
in solid rocket
propellant,
fireworks,
explosives,
flares, matches,
and a variety of
industries. It
usually gets
into drinking
water as a
result of
environmental
contamination
from historic
aerospace or
other industrial
operations that
used or use,
store, or
dispose of
perchlorate and
its salts.

Dibromochloroprop
ane [DBCP] (mg/L)
4/27/22 62 ND/120 200 1.7 Banned
nematocide that

Consumer Confidence Report Page 7 of 11
SWS CCR Revised January 2025
[DBCP] (ng/L)
may still be
present in soils
due to
runoff/leaching
from former use
on soybeans,
cotton,
vineyards,
tomatoes, and
tree fruit
1,2,3-
Trichloropropane
(ng/L)
12/17/25 ND ND 5 .7 Discharge from
industrial and
agricultural
chemical
factories;
leaching from
hazardous
waste sites;
used as
cleaning and
maintenance
solvent, paint
and varnish
remover, and
cleaning and
degreasing
agent;
byproduct
during the
production of
other
compounds and
pesticides.

Chlorine (mg/L) 12/26/24 .75 .72/.81 4 4 Some people
who use water
containing
chlorine well in
excess of the
MRDL could
experience
irritating effects
to their eyes
and nose.

Some people
who drink water
containing
chlorine well in
excess of the
MRDL could

Consumer Confidence Report Page 8 of 11
SWS CCR Revised January 2025
experience
stomach
discomfort
Table 5. Detection of Contaminants with a Secondary Drinking Water Standard Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections SMCL PHG(MCLG)
Typical Source
of
Contaminant
Color (Units) 11/26/24 .6 ND/5 15 NA Naturally-occurring organic materials
Foaming Agents
[MBAS] (µg/L)
11/26/24 6.7 ND/53 500 NA Municipal and
industrial waste
discharges
Turbidity (Units) 11/26/24 .13 ND/.20 5 NA Soil runoff
Total Dissolved
Solids [TDS]
(mg/L)
11/26/24 236 190/280 1000 NA Runoff/leaching
from natural
deposits
Specific
Conductance
(µS/cm)
11/26/24 320 280/400 1600 NA Substances that
form ions when in
water; seawater
influence
Chloride (mg/L) 11/26/24 10.4 5.8/14 500 NA Runoff/leaching from natural
deposits; seawater
influence
Sulfate (mg/L) 11/26/24 13.4 8.3/20 500 NA Runoff/leaching from natural
deposits; industrial
wastes
Table 6. Detection of Unregulated Contaminants
Chemical or
Constituent (and
reporting units)
Sample
Date
Level
Detected
Range of
Detections
Notification
Level Health Effects
1H,1H, 2H, 2Hperfluorooctane
sulfonic acid
(6:2FTS) (µg/L)
5/7/2024 .002 ND/.013 .005
perfluorobutanoic
acid (PFBA) (µg/L)
5/7/2024 .001 ND/.008 .005
perfluorobutanesul
fonic acid (PFBS)
(µg/L)
5/7/2024 .002 ND/.0078 .003 Perfluorobutane
sulfonic acid
exposures resulted
in decreased thyroid

Consumer Confidence Report Page 9 of 11
SWS CCR Revised January 2025
hormone in pregnant
female mice.
perfluoroheptanoic
acid (PFHpA)
(µg/L)
5/7/2024 .002 ND/.012 .003
perfluorohexanoic
acid (PFHxA)
(µg/L)
5/7/2024 .005 ND/.025 .003
perfluorohexanesu
lfonic acid
(PFHxS) (µg/L)
5/7/2024 .012 ND/.059 .003 Perfluorohexane
sulfonic acid
exposures resulted
in decreased total
thyroid hormone in
male rats.
perfluorooctanoic
acid (PFOA) (µg/L)
5/7/2024 .005 ND/.033 .004 Perfluorooctanoic
acid exposures
resulted in increased
liver weight and
cancer in laboratory
animals.
perfluorooctanesul
fonic acid (PFOS)
(µg/L)
5/7/2024 .007 ND/.045 .004 Perfluorooctanesulfo
nic acid exposures
resulted in immune
suppression and
cancer in laboratory
animals.
perfluoropentanoic
acid (PFPeA)
(µg/L)
5/7/2024 .006 ND/.027 .003
perfluoropentanes
ulfonic acid
(PFPeS) (µg/L)
5/7/2024 .002 ND/.0082 .004
Additional General Information on Drinking Water
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. EPA’s Safe Drinking Water Hotline (1-800-426-4791).

Some people may be more vulnerable to contaminants in drinking water than the general population.

Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. U.S. EPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (1-800-426-4791).

Consumer Confidence Report Page 10 of 11
SWS CCR Revised January 2025
Lead-Specific Language: If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. City of Atwater is responsible for providing high quality drinking water but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. [Optional: If you do so, you may wish to collect the flushed water and reuse it for another beneficial purpose, such as watering plants.] If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline (1-800-426-4791) or at http://www.epa.gov/lead.

A service line inventory has been prepared and can be obtained at the City of Atwater Corporation Yard at 470 Aviator Dr, Atwater, CA. During this inventory, the city found no lead service lines.

State Revised Total Coliform Rule (RTCR): [Enter Additional Information Described in Instructions for SWS CCR Document]
Summary Information for Violation of a MCL, MRDL, AL, TT, or Monitoring and Reporting Requirement
Table 7. Violation of a MCL, MRDL, AL, TT or Monitoring Reporting Requirement Violation Explanation Duration Actions Taken to
Correct Violation
Health Effects
Language
None
For Water Systems Providing Groundwater as a Source of Drinking Water Table 8. Sampling Results Showing Fecal Indicator-Positive Groundwater Source Samples Microbiological
Contaminants
(complete if fecalindicator detected)
Total No. of
Detections
Sample
Dates
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
Typical Source of
Contaminant
E. coli No
Detections
0 (0) Human and animal fecal
waste
Enterococci No
Detections
TT N/A Human and animal fecal
waste
Coliphage No
Detections
TT N/A Human and animal fecal
waste

Consumer Confidence Report Page 11 of 11
SWS CCR Revised January 2025
Summary Information for Fecal Indicator-Positive Groundwater Source Samples, Uncorrected Significant Deficiencies, or Violation of a Groundwater TT Special Notice of Fecal Indicator-Positive Groundwater Source Sample: None Special Notice for Uncorrected Significant Deficiencies: None Table 9. Violation of Groundwater TT
Violation Explanation Duration Actions Taken to
Correct Violation
Health Effects
Language
None

City of Atwater
2025 Urban Water Management Plan
June 2026
G
Appendix G
Water Shortage Contingency Plan

City of Atwater
Water Shortage Contingency Plan
DRAFT
JUNE 2026
Prepared for:

CITY OF ATWATER
1350 Broadway Avenue
Atwater, CA 95301
(209) 357-6310
Prepared by:

BLACK WATER CONSULTING ENGINEERS, INC.
602 Lyell Drive
Modesto, CA 95356
(209) 322-1820

City of Atwater
Water Shortage Contingency Plan
June 2026
i

TABLE OF CONTENTS
1 Introduction .......................................................................................................................................... 1 2 Water Supply Reliability Analysis .......................................................................................................... 3

2.1 Seismic Risk Considerations .......................................................................................................... 4

2.2 Ongoing Reliability Evaluation ...................................................................................................... 4 3 Annual Water Supply and Demand Assessment Procedures ............................................................... 5

3.1 Decision-Making Process .............................................................................................................. 6

3.2 Key Data Inputs and Methodologies ............................................................................................. 7

3.3 Evaluation Criteria ......................................................................................................................... 8

3.4 Water System ................................................................................................................................ 8

3.5 Unconstrained Customer Demand ............................................................................................... 8

3.6 Infrastructure Considerations ....................................................................................................... 9

3.7 Other Factors ................................................................................................................................ 9

3.8 Evaluation of Water Supply and Demands ................................................................................... 9 4 Six Standard Water Shortage Levels ................................................................................................... 10 5 Shortage Response Actions ................................................................................................................ 12

5.1 Supply Augmentation Actions ..................................................................................................... 13

5.2 Demand Reduction Actions ........................................................................................................ 15

5.3 Operational Changes ................................................................................................................... 23

5.4 Additional Mandatory Prohibitions ............................................................................................ 23

5.5 Emergency Response Plan .......................................................................................................... 24

5.6 Seismic Risk Assessment and Mitigation Plan ............................................................................ 24

5.7 Shortage Response Action Effectiveness .................................................................................... 25 6 Communication Protocols .................................................................................................................. 27

6.1 Communication for Foreseeable Events ..................................................................................... 27

6.2 Communication for Unforeseeable Events ................................................................................. 28 7 Compliance and Enforcement ............................................................................................................ 29 8 Legal Authorities ................................................................................................................................. 30 9 Financial Consequences of WSCP ....................................................................................................... 31 10 Monitoring and Reporting .................................................................................................................. 32 11 WSCP Refinement Procedures ............................................................................................................ 33 12 Special Water Feature Distinction ...................................................................................................... 34 13 Plan Adoption, Submittal and Availability .......................................................................................... 35

LIST OF TABLES
Table 3-1 – AWSDA Key Responsibilities ...................................................................................................... 6 Table 4-1 – WSCP Levels (DWR Table 8-1) .................................................................................................. 11 Table 5-1 – Supply Augmentation and Other Actions (DWR Table 8-2 Retail) ........................................... 14 Table 5-2 – Demand Reduction Actions (DWR Table 8-3) .......................................................................... 15 Table 5-3 – Historical Water Production Data ............................................................................................ 22 Table 5-4 – Shortage Gap Estimates ........................................................................................................... 22

City of Atwater
Water Shortage Contingency Plan
June 2026
ii

LIST OF FIGURES
Figure 3-1 – Example AWSDA and AWSAR Timeline .................................................................................... 7

APPENDICES
Appendix A – Merced County Multi-Jurisdictional Hazard Mitigation Plan Appendix B – Notices to Public and Public Outreach Efforts Appendix C – City Resolution adopting WSCP

City of Atwater
Water Shortage Contingency Plan
June 2026
iii

LIST OF ACRONYMS AND ABBREVIATIONS
AWSDA Annual Water Supply and Demand Assessment
AWSAR Annual Water Shortage Assessment Report
City City of Atwater
AMC Atwater Municipal Code
CWC California Water Code
DWR Department of Water Resources
ERP Emergency Response Plan
FYE Fiscal Year End
gpcd gallons per capita per day
MG Million Gallons
MJHMP Multi-Jurisdictional Hazard Mitigation Plan
SB Senate Bill
UWMP Urban Water Management Plan
WSCP Water Shortage Contingency Plan

City of Atwater
Water Shortage Contingency Plan
June 2026
1 1 Introduction
Water agencies across California face increasing challenges in reliably meeting customer demands due to a combination of population growth, climate change, prolonged droughts, regulatory constraints, and the potential for catastrophic natural or human-caused events. A water shortage occurs when the available water supply is insufficient to meet normally expected customer water use at a given point in time. Recent history, including the severe statewide drought from 2012 through 2016, demonstrated the vulnerability of many water systems and underscored the importance of proactive planning and preparedness.

In response to these challenges, the California State Legislature enacted Assembly Bill 1668 and Senate Bill 606, collectively known as the 2018 Water Conservation Legislation. Among other requirements, this legislation mandates that Urban Water Management Plans (UWMPs) include a Water Shortage Contingency Plan (WSCP) pursuant to California Water Code (CWC) Section 10632. The WSCP establishes a comprehensive, actionable framework for evaluating water supply reliability and implementing response actions during varying levels of water shortage. While the WSCP is submitted as part of the 2025 UWMP, it is structured as a stand-alone document that may be updated or amended independently, as needed, without requiring amendment of the UWMP itself.

Water shortage contingency planning is a strategic and forward-looking process intended to prepare for and respond to both foreseeable and unforeseeable water supply disruptions. Even where the probability of shortage appears low, a WSCP serves as an essential component of drought and emergency management policy by improving preparedness and reducing the severity of impacts should shortages occur. Drought, regulatory actions, infrastructure failures, seismic events, wildfires, floods, and other natural or man-made disasters may occur with little warning, making advanced planning critical.

The WSCP functions as the Supplier’s operational manual for managing water shortages. It enables near real-time assessment of water supply availability and provides structured, pre-planned response actions aligned with defined levels of shortage. During drought or emergency conditions, the WSCP serves as a roadmap for decision-makers, staff, and the public, allowing for predictable, transparent, and accountable implementation of water shortage response measures. Importantly, Water Code Section 10632.3 directs the State Water Resources Control Board, during a drought emergency, to defer to locally adopted WSCPs to the extent practicable, reinforcing the role of the WSCP in supporting local decision-making.

The WSCP is developed based on a thorough understanding of the Supplier’s water supply reliability, including existing and projected demands, hydrologic variability, regulatory constraints, infrastructure vulnerabilities, and the availability of alternative or supplemental supplies. By anticipating both shortterm and long-term risks to supply, the WSCP identifies feasible and locally appropriate actions to manage shortages, minimize service disruptions, and protect public health and safety. In addition, the analysis and response framework documented in the WSCP may support justification for future projects, policies, and programs intended to reduce vulnerability to water shortages.

City of Atwater
Water Shortage Contingency Plan
June 2026
2 Pursuant to CWC Section 10632, the WSCP is required to include the following elements:
• Key attributes of the water supply reliability analysis conducted pursuant to CWC Section 10632(a)(1), which evaluates the Supplier’s ability to meet demands under varying hydrologic and operational conditions.
• Six standard water shortage levels corresponding to progressive shortages of up to 10, 20, 30, 40, and 50 percent, and shortages greater than 50 percent. [CWC Section 10632(a)(3)(A)] • Locally appropriate shortage response actions for each shortage level, including supply augmentation, demand reduction, operational changes, and mandatory water-use prohibitions, along with estimates of the extent to which each action addresses the supply-demand gap. [CWC Section 10632(a)(4)]
• Procedures for conducting an Annual Water Supply and Demand Assessment (AWSDA), including the data and methods used to evaluate supply reliability. Urban water suppliers are required to submit an Annual Water Shortage Assessment Report (AWSAR) to the California Department of Water Resources (DWR) by July 1 of each year, beginning in the year following adoption of the 2020 UWMP. [CWC Sections 10632(a)(2) and 10632.1]
• Communication protocols and procedures to inform customers, the public, and government entities of current or anticipated water shortages and associated response actions. [CWC Section 10632(a)(5)]
• Customer compliance, enforcement, appeal, and exemption procedures for triggered shortage response actions. [CWC Section 10632(a)(6)]
• Legal authorities, including the authority to implement/enforce shortage response actions, the statement that the supplier shall declare a water shortage emergency under Water Code section 350 et seq., and coordination with cities/counties for possible local emergency proclamation.[CWC Section 10632(a)(7)]
• Financial consequences of and responses to drought conditions, including potential revenue reductions/expense increases, mitigation actions, and, the cost of compliance with Chapter 3.3 regarding excessive residential water use during drought[CWC Section 10632(a)(8)] • Monitoring and reporting procedures to ensure appropriate data collection, track customer compliance, evaluate the effectiveness of response actions, and meet applicable state reporting requirements. [CWC Section 10632(a)(9)]
• A re-evaluation and improvement process to periodically assess the performance and functionality of the WSCP and to make adjustments based on observed conditions, monitoring results, and evolving risks. [CWC Section 10632(a)(10)]

City of Atwater
Water Shortage Contingency Plan
June 2026
3 2 Water Supply Reliability Analysis
Legal Requirements:

Water Code Section 10632(a)(1)
The analysis of water supply reliability conducted pursuant to Section 10635.

Water Code Section 10632.5(a)
In addition to the requirements of paragraph (3) of subdivision (a) of Section 10632, beginning January 1, 2020, the plan shall include a seismic risk assessment and mitigation plan to assess the vulnerability of each of the various facilities of a water system and mitigate those vulnerabilities.

In accordance with CWC Section 10632(a)(1), this section presents findings from the City of Atwater’s (City) water system reliability analysis and identifies the key factors that may contribute to future water shortage conditions. This evaluation incorporates projected water use trends from Chapter 4 of the UWMP, the inventory of current and planned water supply sources outlined in Chapter 6, and the water supply reliability and drought risk assessments presented in Chapter 7. The reliability assessment spans the years 2030 through 2050, while the drought risk assessment covers the five-year period from 2026 to 2030. Together, these elements provide a comprehensive understanding of the City’s water resource capacity and its preparedness to respond to potential shortage scenarios.

When water supply shortfalls are anticipated or observed, the City may declare a water shortage level in accordance with this WSCP, as described in Section 4. In response to identified reliability challenges, the City continues to evaluate additional supply, operational, and water management strategies, as documented in Chapter 7 of the City’s 2025 UWMP.

In addition to hydrologic variability, water supply reliability may be affected by factors beyond the City’s direct control, including statewide water supply conditions, actions taken by upstream or neighboring agencies, regulatory changes, and emergency events. A water shortage condition occurs when the available potable water supply is insufficient to meet ordinary water demands necessary to protect public health and safety. While some water shortages may be foreseeable through planning and monitoring, unforeseen or sudden emergency events, such as power outages, infrastructure failures, or seismic events, may also disrupt water supplies.

The City's sole source of drinking water is from the groundwater aquifer underlying the community. The City currently obtains groundwater from approximately nine (9) wells. The City’s wells pump from a nonadjudicated groundwater basin (Merced Subbasin) with no limits on pumping. However, the Merced Subbasin has been identified as being in a critical state of overdraft. Therefore, the future reliability of the groundwater supply will depend on the long-term balance of groundwater extraction and recharge for the Merced Subbasin as a whole.

The City’s 2025 UWMP evaluates the long-term (20-year) and near-term (5-year) supply reliability of the City’s water system, including consideration for a normal year, single dry year, and a 5-year dry period.

Constraints on the water supply reliability for the City are primarily water quantity, water quality, and climate change. The 2025 UWMP estimates that the reliability of the City’s water supply is sufficient to meet long-term and near-term demands based on available information for the groundwater and positive impacts from State requirements for sustainable groundwater management.

City of Atwater
Water Shortage Contingency Plan
June 2026
4 2.1 Seismic Risk Considerations
The City relies on water supplies conveyed through the Sacramento–San Joaquin Delta, which is recognized as vulnerable to seismic events that could disrupt water conveyance, degrade water quality, or result in prolonged supply interruptions. Rather than duplicating a seismic risk assessment within this WSCP, the City satisfies the seismic risk assessment and mitigation requirements of CWC Section 10632.5 by reference to its adopted multi-jurisdictional hazard mitigation planning documents.

The City participates in the Merced County Multi-Jurisdictional Hazard Mitigation Plan (MJHMP), which evaluates regional seismic hazards, identifies vulnerabilities of critical infrastructure, and outlines mitigation strategies intended to reduce risk and improve system resilience. The MJHMP includes assessment of earthquake hazards applicable to the City and provides mitigation actions relevant to water supply and other essential infrastructure. The applicable hazard mitigation plan is included as Appendix A.

2.2 Ongoing Reliability Evaluation
Consistent with Water Code Section 10632(a)(2), the City will conduct an AWSDA to evaluate near-term water supply reliability under prevailing hydrologic, regulatory, and operational conditions. These AWSDAs will inform the need for implementation, adjustment, or escalation of water shortage response actions under this WSCP as discussed in Section 3. The analyses and response framework contained in this WSCP have been developed in the context of the City’s existing water supply portfolio and reliability evaluations.

City of Atwater
Water Shortage Contingency Plan
June 2026
5 3 Annual Water Supply and Demand Assessment Procedures Legal Requirements:

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

Water Code Section 10632.1.

An urban water supplier shall conduct an annual water supply and demand assessment pursuant to subdivision (a) of Section 10632 and, on or before July 1 of each year, submit an annual water shortage assessment report to the department with information for anticipated shortage, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the supplier’s water shortage contingency plan. An urban water supplier that relies on imported water from the State Water Project or the Bureau of Reclamation shall submit its annual water supply and demand assessment within 14 days of receiving its final allocations, or by July 1 of each year, whichever is later.

Beginning in 2022, CWC Section 10632.1 requires the City to conduct an AWSDA on or before July 1 of each year and to submit an AWSAR to the California DWR by July 1 annually. The purpose of the AWSDA and AWSAR is to evaluate near-term water supply reliability for the upcoming year and to ensure that appropriate water shortage response actions are identified and implemented in a timely manner, if warranted.

This section of the WSCP describes the procedures used by the City to prepare the AWSDA and AWSAR.

These procedures are intended to establish a clear, consistent process for the annual evaluation of water supply and demand conditions, including the timing, data sources, analytical steps, and decision-making framework used to determine water supply reliability and potential shortage conditions.

City of Atwater
Water Shortage Contingency Plan
June 2026
6 The AWSAR will incorporate the results of the AWSDA and identify any recommended water shortage response actions for the current year, consistent with the shortage levels and response actions defined in this WSCP.

The AWSDA will include the following components:

1. Data and methodologies

2. Evaluation criteria

3. Description of the water system

4. Unconstrained customer demand

5. Infrastructure considerations

6. Other relevant factors

7. Water supply and demand evaluation
The specific information and analyses included within each of these components are described in this chapter. Based on the findings of the AWSDA, the AWSAR will document whether water shortage conditions are anticipated and will recommend any triggered shortage response actions in accordance with the WSCP.

3.1 Decision-Making Process
The City Department of Public Works will be responsible for preparation, obtaining formal approval, and submitting the AWSAR to the DWR. Key responsibilities for preparation of the AWSDA and AWSAR are listed in Table 3-1. Early in the process, the key team members will be selected and assigned responsibilities to ensure accurate and timely completion of the documents. Each AWSAR should include a summary of the key members involved and their roles and responsibilities.

Table 3-1 – AWSDA Key Responsibilities
# Activity
1 Convene AWSDA and AWSAR team
2 Information collection and review (see Section 3.2, Key Data Inputs and Methodologies) 3 Prepare draft AWSAR
4 Finalize AWSAR
5 Submit AWSAR to DWR
An example timeline for the decision-making process is provided in Figure 3-1. Actual dates for each activity may vary, however the AWSDA is required to be formally approved and submitted to DWR by July 1 each year.

City of Atwater
Water Shortage Contingency Plan
June 2026
7 Figure 3-1 – Example AWSDA and AWSAR Timeline

3.2 Key Data Inputs and Methodologies
Planned water supplies will be used as inputs to the City, which may be used to evaluate the water system reliability for the current year, while considering that the year to follow will be a dry year. To be consistent with the most recently prepared 2025 UWMP, the current year is defined as the calendar year (January 1 – December 31) for the year in which the document is prepared and the year to follow is defined as the subsequent calendar year.

In evaluating available water supplies, the City will consider the following factors:
• Summary of active water supply sources and their capacities; • Monthly water production data for the previous calendar year; • Available weather data for the previous calendar year and current year; • Population data for the previous calendar year and current year; • Growth projections in terms of land use and/or population for the current year; • Recently completed documents and studies related to the water system and water supply sources;
• Recent regulatory documents;
• Water quality data for the previous calendar year;
• Water system improvements completed in the previous calendar year and planned for the next two years;
• Information on issues encountered in water system for the previous calendar year. Issues may include exceeding contaminant limits, breaks in pipeline, and decreased well production; • Current and projected hydrological conditions; and
• Other data which affects the water system.

Planned water supply sources and quantities will be described and will be reasonably consistent with the supply projections presented in Chapter 6 (Normal-Year Water Supply Characterization) of City’s most recent UWMP. If water supply sources or projected quantities differ significantly from those identified in the UWMP, the City will document and explain the basis for the differences.

City of Atwater
Water Shortage Contingency Plan
June 2026
8 Planned unconstrained water demands will be used as inputs to the AWSDA for the current year and the subsequent dry year. Unconstrained water demand represents customer demand in the absence of water shortage response actions or conservation measures.

In evaluating water demand, the City will consider the following factors:
• Weather conditions;
• Water year type;
• Population changes, including those associated with development projects; • Anticipated new demands, such as changes in land use; • Pending policy changes that may affect water use; and • Infrastructure operations.

Planned water demand types and quantities will be described and will be reasonably consistent with the demand projections presented in Chapter 4 (Water Use Characterization) of the City’s most recent UWMP.

If projected demands differ significantly from those identified in the UWMP, the City will document and explain the reasons for the differences.

3.3 Evaluation Criteria
In preparing the AWSDA, the City will apply the assessment methodology and evaluation criteria described in this section to evaluate water supply reliability for the current year and one subsequent dry year.

Available water supplies and projected water demands will be compared to assess the reliability of the City’s water supply for the current year and the subsequent dry year. Water supply for a given year will be considered reliable if available supplies are equal to or greater than projected unconstrained water demands. If available supplies are insufficient to meet anticipated demands in either the current year or the subsequent dry year, the magnitude of the supply shortfall will be quantified and used to determine the applicable water shortage condition.

Based on the results of the AWSDA, the City will identify and evaluate appropriate water shortage response actions consistent with the water shortage levels and response actions established in this WSCP.

3.4 Water System
This section of the Annual Assessment should describe the water system, including the water supply facilities and distribution and storage facilities. Information on water quality and historical issues should be included.

3.5 Unconstrained Customer Demand
Unconstrained customer demand for the current year will be developed in this section. The methodology for the calculations should be described in detail. References for the sources and assumptions used should be provided. Unconstrained customer demands for subsequent years may be calculated and included.

Various methods could be used to calculate unconstrained customer demand. The method should be consistent with previous City documents, including the 2025 UWMP. If an alternative method is used, reasons for the change in approach shall be provided. The most common methods will either involve the

City of Atwater
Water Shortage Contingency Plan
June 2026
9 use of population projections and a per capita water demand or water demand factors for various types of land uses and estimates for developed areas, by land use type.

3.6 Infrastructure Considerations
This section should include an evaluation of how the City's infrastructure capabilities and constraints may affect its ability to deliver supplies to meet customer demand in the coming year. Anticipated capital projects that may influence capabilities, such as repairs that may constrain capabilities (e.g., planned treatment plant upgrades) or new projects that may add capacity (e.g., a new groundwater well or system intertie), should be described.

3.7 Other Factors
Other factors that can influence or disrupt the water supply, along with unique local considerations should be described in this portion of the Annual Assessment. These factors may include recent regulatory requirements, documents and studies related to the water system and water supply sources, and weather conditions.

3.8 Evaluation of Water Supply and Demands
This section of the assessment will summarize the projected available water supply for the current year based on the information provided in previous sections of the Annual Assessment. The evaluation criteria will be applied to determine if the available water supply is sufficient to meet unconstrained customer demands.

City of Atwater
Water Shortage Contingency Plan
June 2026
10 4 Six Standard Water Shortage Levels
Legal Requirements:

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

Shortage levels shall also apply to catastrophic interruption of water supplies, including, but not limited to, a regional power outage, an earthquake, and other potential emergency events. (B) An urban water supplier with an existing water shortage contingency plan that uses different water shortage levels may comply with the requirement in subparagraph (A) by developing and including a cross-reference relating its existing categories to the six standard water shortage levels.

To provide a consistent regional and statewide framework for communicating the severity of water supply shortage conditions, the 2018 Water Conservation Legislation requires urban water suppliers to define six standard water shortage levels corresponding to progressive ranges of water supply shortages. CWC Section 10632(a)(3) requires these shortage levels to be based on the supplier’s water supply conditions and may consider factors such as percentage reductions in available water supply, changes in groundwater levels, changes in surface water elevations, land subsidence, or other hydrologic or local conditions indicative of the water supply available for use.

In accordance with these requirements, the City adopted the six standard water shortage levels established by the California DWR for inclusion in WSCPs in 2025. These standard shortage levels correspond to progressive water supply shortages of up to 10 percent, 20 percent, 30 percent, 40 percent, 50 percent, and greater than 50 percent from normal reliability conditions. The standard water shortage levels used by the City are consistent with those presented in Table 4-1 (DWR Table 8-1). The water shortage levels and corresponding response actions adopted by the City apply to both foreseeable water supply shortages, such as drought or regulatory curtailments, and unforeseeable supply interruptions, including infrastructure failures or other emergency conditions.

City of Atwater
Water Shortage Contingency Plan
June 2026
11 Table 4-1 – WSCP Levels (DWR Table 8-1)
Submittal Table 8-1: Cross-reference for Standard vs Supplier Shortage Levels Water Code Section 10632(a)(3)(B)
Check the box if the Supplier uses the Standard six levels of water shortage.

Proceed to the next table.

Standard Shortage
Levels
Percent Shortage
Range
Suppliers Shortage
Levels
Percent Shortage
Range
1 Up to 10%
2 Up to 20%
3 Up to 30%
4 Up to 40%
5 Up to 50%
6 >50%
NOTES: Shortage Response Level 1 includes prohibition of outdoor water wasting activities, timely leak repair requirements, and education campaigns.

Shortage Response Level 2 includes an increase in landscape irrigation limits.

Shortage Response Level 3 includes prohibition of the use of water which causes flooding, vehicle washing limitations, and no street cleaning.

Shortage Response Level 4 includes prohibition of landscape irrigation.

Shortage Response Level 5 includes a requirement of water served upon request at restaurants, commercial lodging establishment limitation, and decorative water feature limitations.

Each water shortage level provides the basis for implementing graduated water shortage response actions, as described in subsequent sections of this WSCP.

City of Atwater
Water Shortage Contingency Plan
June 2026
12 5 Shortage Response Actions
Legal Requirements:

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

Water Code Section 10632.2
An urban water supplier shall follow, where feasible and appropriate, the prescribed procedures and implement determined shortage response actions in its water shortage contingency plan, as identified in subdivision (a) of Section 10632, or reasonable alternative actions, provided that descriptions of the alternative actions are submitted with the annual water shortage assessment report pursuant to Section 10632.1. Nothing in this section prohibits an urban water supplier from taking actions not specified in its water shortage contingency plan, if needed, without having to formally amend its urban water management plan or water shortage contingency plan.

CWC Section 10632(a)(4) requires shortage response actions that align with the shortage levels defined in Table 4-1 (DWR Table 8-1) and include locally appropriate supply augmentation actions, demand reduction actions, operational changes, and additional mandatory prohibitions against specific water use practices. An estimate of the extent to which the gap between supplies and demand will be reduced by implementation of the actions must be provided.

The City intends to implement a balanced and flexible approach to water shortage response, integrating demand reduction, supply augmentation, and operational adjustments to address the identified water supply shortfall and the associated shortage level. Response actions will be selected and implemented to reduce the gap between available water supplies and projected demands and to achieve the water use reduction objectives associated with the declared water shortage level.

The City relies on system-wide water metering to monitor water production and customer water use and to evaluate the effectiveness of shortage response actions. The water system is nearly fully metered with over 90% of all services metered, allowing the City to compare current water use to historical use and to establish demand reduction targets.

City of Atwater
Water Shortage Contingency Plan
June 2026
13 Water production and customer water use may be evaluated by customer sector or individual account and compared to prior periods to assess trends and compliance with demand reduction goals. This ongoing monitoring allows the City to adjust shortage response actions, as needed, to balance water demands with available supplies. For example, the City may increase public outreach efforts or enhance enforcement of water use restrictions if demand reduction targets are not being met. Conversely, outreach frequency or enforcement intensity may be reduced if demand reductions exceed established targets.

The shortage response actions described in subsequent sections are intended to provide the City with a range of tools to respond effectively to water shortage conditions. Response actions are initiated at the shortage levels identified and may continue or intensify at higher shortage levels. Because the City may continuously monitor conditions and adjust response actions over time, the extent to which individual actions reduce the gap between water supply and demand may be difficult to quantify precisely and is therefore provided as an estimate. Certain response actions, such as public outreach, education, and enforcement, support the effectiveness of other measures and may not have a directly quantifiable water savings when implemented independently.

5.1 Supply Augmentation Actions
The City solely relies on groundwater from wells to supply all water demand in the City and does not currently have alternate water sources for normal or emergency conditions. However, it is likely that in the future, certain groundwater wells will be inactive except during a water shortage event. Table 5-1 (DWR Table 8-2 Retail) lists the supply augmentation strategies that the City currently uses.

City of Atwater
Water Shortage Contingency Plan
June 2026
14 Table 5-1 – Supply Augmentation and Other Actions (DWR Table 8-2 Retail) Submittal Table 8-2 Retail: Supply Augmentation and Other Actions Water Code Section 10632(a)(4)(A),(C) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Supply Augmentation
Methods and Other
Actions by Water
Supplier
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal tool
How much is this going to
reduce the shortage gap?
Additional Explanation or
Reference
(OPTIONAL) Volume or
Percentage
Drop down
Shortage Gap
Reduction
Value
(May be a range)
(%)
Add additional rows as needed
1-6 Other Actions Percentage 1-10%
Decrease line flushing. The
City decreases the frequency
and duration of water system
flushing maintenance
activities.
1-6 Other Actions Percentage 1-10%
Reduce system water loss.

The City increases efforts to
correct water system losses,
including repairing leaks and
eliminating illicit connections.
1-6 Other Actions Percentage 1-10%
Increase water waste patrols.

The City conducts more
frequent patrols to
discourage water wasting and
correct water wasting
practices in the community.
1-6 Other Actions Percentage 1-10%
Increase frequency of meter
reading. The City may
increase frequency of meter
reading to better track
services that may have leaks
or usually high water
consumption.

DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Shortage Levels 1-6 Supply Augmentation Actions are going to reduce the shortage gap up to the full shortage amount hence the Shortage Gap Reduction Value as a range. For example: If the City is mandating shortage level 3 demand reduction actions and are only reducing the amount of water usage by 27%, this supply augmentation actions will assist in reaching the specified reduction value.

City of Atwater
Water Shortage Contingency Plan
June 2026
15 5.2 Demand Reduction Actions
During water shortage conditions, the City will reduce customer water demand through implementation of the demand reduction actions identified in Table 5-2 (DWR Table 8-3 Retail). Demand reduction actions are organized by water shortage level, and each action includes an estimate of the extent to which its implementation is expected to reduce the gap between available water supply and projected demand.

For each demand reduction action, Table 5-2 (DWR Table 8-3 Retail) also identifies whether compliance measures, such as penalties, charges, or other enforcement mechanisms, may be applied. Demand reduction actions are initiated at the water shortage levels identified and may continue to be implemented or intensified at higher shortage levels, as appropriate.

Table 5-2 – Demand Reduction Actions (DWR Table 8-3)
Submittal Table 8-3 Retail: Demand Reduction Actions
Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
Add additional rows as needed
1 Expand Public Information
Campaign Volume
Supports
other
demand
reduction
actions
Increases
awareness of
water shortage
levels and
community's
responsibility in
abiding by set
reduction
actions from
the City. The
City distributes
public
information
regarding
water issues in
mass mailing to
all water
services
customers,
through the
No

City of Atwater
Water Shortage Contingency Plan
June 2026
16 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
City's Internet
site, directly to
walk-in
customers at
City Hall, and at
the Public
Works
Department
and the City
Community
Center.
1 Improve Customer Billing Volume
Supports
other
demand
reduction
actions
The City
encourages
water
conservation
through its
water and
sewer service
rate structure.

No
1 Other Volume
Supports
other
demand
reduction
actions
Offers water
use surveys.

Upon request,
the City
personnel will
perform an
interior and
exterior
inspection of a
customer's
residence or
facility in order
to ascertain
potential
No

City of Atwater
Water Shortage Contingency Plan
June 2026
17 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
sources of
water waste.
1 Other - Customers must
repair leaks, breaks, and
malfunctions in a timely
manner
Volume
Supports
other
demand
reduction
actions
Repair all water
leaks within
five (5) days of
notification by
the City Public
Works
Department
unless other
arrangements
are made with
the City Public
Works Dept.

Yes
1 Other - Require automatic
shut of hoses Volume
Supports
other
demand
reduction
actions
Use a handheld hose
equipped with
a positive shutoff nozzle or
bucket to
water
landscaped
areas.

Yes
1 Other Volume
Supports
other
demand
reduction
actions
Wash vehicle
using a bucket,
not exceeding
5 gallons in
capacity. Avoid
washing during
hot conditions
when
Yes

City of Atwater
Water Shortage Contingency Plan
June 2026
18 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
additional
water is
required due to
evaporation.
1 Other - Prohibit use of
potable water for washing
hard surfaces
Volume
Supports
other
demand
reduction
actions
Exception
allowed for
alleviating
safety or
sanitation
hazards, in
which case,
areas shall be
washed from
water
contained in a
bucket or
container not
exceeding 5
gallons in
capacity.

Yes
1 Other Volume 20 gpcd
Complete
installation of
water meters
to service
connections.

No
1 Other Volume
Supports
other
demand
reduction
actions
Moratorium or
net zero
demand
increase on
new
connections.

The City will
temporarily
Yes

City of Atwater
Water Shortage Contingency Plan
June 2026
19 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
limit or ban
new water
service
connections
within the
service area.
2 Landscape - Limit
landscape irrigation to
specific days
Volume 25 gpcd 3 days/week. Yes
2 Landscape - Limit
landscape irrigation to
specific times
Volume
Supports
other
demand
reduction
actions
Customers shall
not irrigate any
lawn or
landscape area
between the
hours of 10:00
am and 5:00
pm on any day
of the week.

Yes
3 Landscape - Limit
landscape irrigation to
specific days
Volume 30 gpcd 2 days/week Yes
4 Landscape - Limit
landscape irrigation to
specific days
Volume 30 gpcd 1 day/week Yes
5-6
Landscape - Limit
landscape irrigation to
specific days
Volume 30 gpcd
Prohibit all
landscape
irrigation.

Yes
5-6
Water Features - Restrict
water use for decorative
water features, such as
fountains
Volume
Supports
other
demand
reduction
actions
Stop operating
ornamental
fountains or
similar
decorative
water features
Yes

City of Atwater
Water Shortage Contingency Plan
June 2026
20 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
unless recycled
water is used.
5-6 CII - Restaurants may only
serve water upon request
Volume
Supports
other
demand
reduction
actions
Serve and refill
water in
restaurants and
other food
service
establishments
only upon
request.

Yes
5-6 Other water feature or
swimming pool restriction Volume
Supports
other
demand
reduction
actions
Initial filling of
swimming
pools or
otherwise of
the full
capacity of a
pool over 2,500
gallons is
prohibited.

Emptying and
refilling all
pools is
prohibited.

Yes
5-6
CII - Lodging establishment
must offer opt out of linen
service
Volume
Supports
other
demand
reduction
actions
Offers guests in
hotels, motels,
and other
commercial
lodging
establishments
the option of
not laundering
Yes

City of Atwater
Water Shortage Contingency Plan
June 2026
21 Submittal Table 8-3 Retail: Demand Reduction Actions Water Code Section 10632(a)(4)(B) and (E)
Yes Is the Supplier completing this table using the standard six levels? (yes/no) Shortage
Level
Demand Reduction
Actions
Drop down list
These are the only categories
that will be accepted by the
WUEdata online submittal
tool. Select those that apply.

How much is this going to
reduce the shortage gap?
Additional
Explanation or
Reference
(OPTIONAL)
Penalty,
Charge, or
Other
Enforcement?
For Retail
Suppliers Only
Drop Down List
Volume or
Percentage
Drop down
Shortage
Gap
Reduction
Value
(May be a
range)
towels and
linens daily.

DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES: Shortage Gap Reduction Value units are in gpcd to effectively depict the volume of shortage on a per capita basis. For the first violation, the consumer shall be issued an administrative citation with a warning. For the second violation, the consumer shall be issued an administrative citation in the amount of $50. For the third violation, the consumer shall be issued an administrative citation in the amount of $75. For the fourth violation, the consumer shall be issued an administrative citation in the amount of $250.

Water use reductions for each demand reduction action included in Table 5-2 (DWR Table 8-3 Retail) were estimated based on information from water conservation studies and an analysis of historical per capita water production data for the City between 2021 and 2025. Most of the demand reduction is assumed to occur from restrictions on landscape irrigation.

Water use reduction associated with the demand reduction actions for shortage levels 1 and 2 was primarily assigned to limiting landscape irrigation to a three-day water schedule and estimated to be the difference between the 2020 target per capita gross water use of 254 gallons per capita per day (gpcd) from the Senate Bill (SB) X7-7 tables in the 2025 UWMP and the average per capita baseline water use of 203 gpcd, achieved between 2021 and 2025. SB X7-7 refers to the Water Conservation Act of 2009 which required that all California water suppliers increase their water use efficiency, including achieving a 20 percent reduction in urban in per capita water use by December 31, 2020.

Water use reduction associated with reducing landscape irrigation by one day was estimated by comparing the average water use for the three lowest months of each year with the annual average water use for the year on a per capita basis for 2021 – 2025, and assuming that outdoor water use was occurring three days per week. The overall difference between outdoor water use and baseline water use was divided by three to estimate landscape irrigation water use per day. Tables 5-3 and 5-4 summarize the calculations for estimating the impacts of the demand reduction actions.

City of Atwater
Water Shortage Contingency Plan
June 2026
22 Table 5-3 – Historical Water Production Data
Water Pumped (Million Gallons (MG))
Year
Month # of days 2021 2022 2023 2024 2025
January 31 120.6 71.5 110.8 106.0 111.6
February 28 146.2 133.4 97.9 96.4 98.5
March 31 160.6 181.1 109.9 123.1 109.3
April 30 236.3 199.9 169.9 159.5 170.8
May 31 280.3 269.1 226.9 214.0 238.0
June 30 289.9 304.5 284.1 274.0 268.3
July 31 339.1 311.6 332.3 298.1 280.9
August 31 324.1 290.3 310.1 227.1 285.2
September 30 284.1 230.7 233.5 239.3 251.5
October 31 195.3 128.4 185.1 225.2 182.2
November 30 134.4 155.3 133.1 144.4 120.0
December 31 114.4 119.0 127.1 109.1 103.4
Total 2,625.4 2,394.8 2,320.6 2,216.4 2,219.8
Population 31,996 31,735 31,592 31,921 31,862
Average water use, gpcd 225 207 201 190 191
5-year average water use, gpcd 203
Baseline water use(lowest 3 months), MG 369.4 318.9 318.5 311.5 311.3 Baseline, gpcd 125 108 112 108 109
5-year baseline water use, gpcd 113
Estimated outdoor water use, gpcd 99 99 89 82 82
5-year average outdoor water use, gpcd 90
Table 5-4 – Shortage Gap Estimates
# Description Value
(1) Average Water Use without Demand Reduction Actions, gpcd (SB X7-7 2020 Target)
254
(2) Average Water Use after Shortage Level 1 and 2 Actions, gpcd (Average water use, 2021-2025)
203
(3) Estimated Reduction in Shortage Gap from Level 1 and 2 Actions, gpcd 51 (4) Average outdoor water use (3-day watering schedule), gpcd 90 (5) Reduction in Shortage Gap by one day reduction in watering schedule, gpcd 30 Notes:
(2) Average Water Use after Shortage Level 1 and 2 Actions = Average water use from Table 5-3. (3) Estimated Reduction in Shortage Gap from Level 1 and 2 Actions = (1) Average Water Use without Demand Reduction Actions - (2) Average Water Use after Shortage Level 1 and 2 Actions. (4) Average outdoor water use (3-day watering schedule) = Average outdoor water use from Table 5-3. (5) Reduction in Shortage Gap by one day reduction in watering schedule = (4) ÷ 2, rounded.

City of Atwater
Water Shortage Contingency Plan
June 2026
23 5.3 Operational Changes
During a water shortage at any declared level, the City may implement operational measures to support effective implementation of this WSCP. Operational changes may include, but are not limited to:
• Expand public information campaign.
• Implement or modify drought rate structure or surcharge. • Offer water use surveys.
• Decrease line flushing.
• Increase water waste patrols.

Operational measures may support a range of functions, including conducting water waste patrols, implementing communication and public outreach protocols, responding to customer service inquiries, scheduling and conducting site assessments and consultations, processing incentive or rebate applications, and carrying out compliance monitoring and enforcement activities.

In addition, the City may implement operational adjustments intended to reduce non-essential water use, such as limiting routine water main flushing activities where operationally feasible and restricting potable water use for fire department training drills, consistent with public health and safety requirements.

Operational changes will be evaluated at each water shortage level to determine the appropriateness, timing, and duration of implementation, based on prevailing water supply conditions, operational needs, and system reliability considerations.

5.4 Additional Mandatory Prohibitions
Chapter 13 Section 13.030 of the Atwater Municipal Code (AMC) includes the following mandatory prohibitions for all users:

1. Water abuse is prohibited. It shall be unlawful for any person to knowingly or willingly cause or allow any water delivered by the City water system and received by such person to become water waste runoff and to flow away from property owned or occupied by such person in any gutter, ditch, or other manner over the surface of the ground. The definition of water abuse is excessive water flowing over the curb resulting in water running in the gutter a distance of 50 feet or directly into a catch basin.

2. Water waste runoff shall mean water flowing away from property caused by excessive application(s) of water delivered by the City water system beyond reasonable or practical flow rates, water volumes or duration of application.

3. Broken or defective plumbing, sprinklers, watering, or irrigation systems which permit the escape or leakage of water are prohibited. Repair all water leaks within five days of notification by the City Public Works Department unless other arrangements are made with the City Public Works Department.

4. The use of water in any manner which causes, allows, or permits the flooding of any premises, or any portion thereof, is prohibited.

5. All uses of non-potable water without the permission of the Public Works Department are prohibited.

6. Stop washing down paved surfaces, including but not limited to sidewalks, driveways, parking lots, tennis courts, or patios, except when it is necessary to alleviate safety or sanitation hazards, in

City of Atwater
Water Shortage Contingency Plan
June 2026
24 which case, such areas shall be washed from water contained in a bucket or container not exceeding five gallons in capacity.

7. Use a hand-held hose equipped with a positive shut-off nozzle or bucket to water landscaped areas, including trees and shrubs located on residential and commercial properties that are not irrigated by a landscape irrigation system.

8. Stop operating ornamental fountains or similar decorative water features unless recycled water is used.

9. Wash vehicles using a bucket, not exceeding five gallons in capacity, and a hand-held hose with positive shut-off nozzle, mobile high pressure/low volume wash system, or at a commercial site that re-circulates (reclaims) water on-site. Avoid washing during hot conditions when additional water is required due to evaporation.

10. Serve and refill water in restaurants and other food service establishments only upon request.

11. Offer guests in hotels, motels, and other commercial lodging establishments the option of not laundering towels and linens daily.

12. Initial filling of new swimming pools or otherwise of the full capacity of a pool is allowed with permit. Draining and refilling pools are allowed for maintenance and cleaning with permit.

13. The application of water from public water supply to outdoor landscapes during or within 48 hours after any measurable rainfall is prohibited.

Chapter 13.13.030 of the AMC also includes additional mandatory prohibitions applicable to gardens and landscaping and new plantings. While the AMC establishes enforceable water-waste prohibitions applicable at all times, formal water shortage levels and associated response actions are defined in this WSCP pursuant to CWC Section 10632.

5.5 Emergency Response Plan
The water shortage levels described in Section 4 apply to both foreseeable and unforeseeable water supply shortage conditions, including catastrophic water supply emergencies.

The City maintains an Emergency Response Plan (ERP) to address catastrophic and unanticipated water supply disruptions. Emergency response activities related to water supply shortages are coordinated, as appropriate, with the Merced County Office of Emergency Services. The ERP outlines response procedures for a range of unforeseen incidents, including but not limited to water supply contamination, seismic events, major infrastructure failures, and other emergencies that may disrupt water system operations.

The ERP identifies actions to be implemented in advance of, during, and following emergency events to support continuity of service, protect public health and safety, and facilitate system recovery. For security and operational reasons, the ERP is maintained as a confidential document and is not included as an appendix to this WSCP.

5.6 Seismic Risk Assessment and Mitigation Plan
Legal Requirements:

Water Code Section 10632.5
(a) In addition to the requirements of paragraph (3) of subdivision (a) of Section 10632, beginning January 1, 2020, the plan shall include a seismic risk assessment and mitigation plan to assess the vulnerability of each of the various facilities of a water system and mitigate those vulnerabilities.

City of Atwater
Water Shortage Contingency Plan
June 2026
25 (b) An urban water supplier shall update the seismic risk assessment and mitigation plan when updating its urban water management plan as required by Section 10621. (c) An urban water supplier may comply with this section by submitting, pursuant to Section 10644, a copy of the most recent adopted local hazard mitigation plan or multihazard mitigation plan under the federal Disaster Mitigation Act of 2000 (Public Law 106-390) if the local hazard mitigation plan or multihazard mitigation plan addresses seismic risk.

CWC Section 10632.5(a) requires UWMPs to include a seismic risk assessment and mitigation plan to evaluate and address a water system’s potential seismic vulnerabilities. This requirement may be satisfied by incorporating an adopted Local Hazard Mitigation Plan or a Risk and Resilience Assessment, provided the document addresses seismic risk.

The City is located within Merced County and is included within the 2021-2026 County’s MJHMP. A copy of the 2021-2026 MJHMP is included in Appendix A. The plan was prepared in coordination with the Health and Safety Element of the Merced County General Plan, as the planning effort covers common overlapping issues. The plan is a multi-jurisdictional plan that covers the City of Atwater, City of Livingston, City of Los Banos, and the unincorporated Merced County. The plan addresses seismic risk and satisfies the requirement of CWC Section 10632.5(a).

5.7 Shortage Response Action Effectiveness
The effectiveness of the City’s shortage response actions will be evaluated through ongoing monitoring of water supply conditions, customer water use, and compliance with adopted water use restrictions.

Because water shortage conditions may result from a variety of foreseeable and unforeseeable circumstances, the effectiveness of individual response actions may vary depending on the severity, duration, timing, and cause of the shortage.

The City will use water production and customer water use data collected through its metered water system to compare actual water use against projected demands and the demand reduction targets associated with each declared water shortage level.

Certain shortage response actions are expected to result in measurable reductions in water demand.

Other actions, including public outreach, education, and communication efforts, support the overall effectiveness of the City’s water shortage response but may not be independently quantifiable. These supporting actions are nonetheless essential to promoting public awareness, encouraging voluntary conservation, and reinforcing mandatory requirements.

The City will evaluate the effectiveness of shortage response actions using multiple indicators, including, but not limited to:
• Progress toward achieving the demand reduction targets associated with the declared water shortage level;
• Trends in total system water use and water use by customer sector; • The number and nature of reported or observed water waste violations; • Customer compliance rates and enforcement outcomes; and • Input and feedback from City staff and the public.

City of Atwater
Water Shortage Contingency Plan
June 2026
26 If monitoring indicates that implemented shortage response actions are not sufficient to address the identified supply shortfall, the City may intensify existing actions, implement additional measures identified in this WSCP, or advance to a higher water shortage level, as appropriate. Conversely, if water supply conditions improve or demand reductions exceed targets, the City may modify or relax response actions while continuing to ensure water supply reliability.

The results of this evaluation will inform the City’s AWSDA, ongoing operational decision-making, and future refinements to the WSCP, consistent with the adaptive management approach described in Section

11.

City of Atwater
Water Shortage Contingency Plan
June 2026
27 6 Communication Protocols
Legal Requirements:

Water Code Section 10632 (a)(5)
Communication protocols and procedures to inform customers, the public, interested parties, and local, regional, and state governments, regarding, at a minimum, all of the following:
(A) Any current or predicted shortages as determined by the annual water supply and demand assessment described pursuant to Section 10632.1.
(B) Any shortage response actions triggered or anticipated to be triggered by the annual water supply and demand assessment described pursuant to Section 10632.1. (C) Any other relevant communications
In the event of a water shortage, the City will provide timely and effective communication to customers, the general public, interested parties, and relevant local, regional, and state agencies. Clear and consistent communication is essential to ensure appropriate response actions, public awareness, and regulatory coordination during both foreseeable and unforeseeable water shortage conditions.

This section describes City’s communication protocols for anticipated water shortages identified through planning and assessment activities, as well as for unanticipated emergency events.

6.1 Communication for Foreseeable Events
Water shortage conditions may be foreseeable when identified through the AWSDA, as described in Section 3. When the potential for a water shortage is identified, the City’s Council may determine and declare a water shortage emergency in accordance with the AMC.

The City will hold a duly noticed public meeting to present the current or projected water shortage conditions identified through the AWSDA. At the public meeting, the City Council will determine whether a water shortage emergency exists, the severity of the shortage, and the applicable water shortage level.

The City Council will also consider the shortage response actions triggered or anticipated to be triggered by the declared shortage level and may take action to adopt a resolution declaring a water shortage emergency, establishing the applicable shortage level, and authorizing implementation of response actions.

For foreseeable water shortage events, the City may implement one or more of the following communication actions at any water shortage level, as appropriate:

1. Coordinate internally and with regional water service providers and Merced County regarding the potential proclamation of a local emergency.

2. Issue public notice of City Council meetings at which AWSDA findings and recommendations related to water shortage conditions and response actions will be presented.

3. Communicate water shortage conditions, response actions, and customer responsibilities through a combination of bill inserts, newsletters, the City website, social media, press releases, and blog posts.

City of Atwater
Water Shortage Contingency Plan
June 2026
28 4. Communicate with relevant local, regional, and state agencies and officials, primarily through email correspondence.

6.2 Communication for Unforeseeable Events
Water shortages may also result from unforeseeable events such as earthquakes, fires, infrastructure failures, civil unrest, or other catastrophic incidents. In these circumstances, communication protocols and procedures outlined in City’s ERP will guide notification and public information activities. Depending on the nature and severity of the event, the City may implement communication actions at any water shortage level.

City of Atwater
Water Shortage Contingency Plan
June 2026
29 7 Compliance and Enforcement
Legal Requirements:

Water Code Section 10632 (a)(6)
For an urban retail water supplier, customer compliance, enforcement, appeal, and exemption procedures for triggered shortage response actions as determined pursuant to Section 10632.2.

Chapter 13 Section 13.040 of the AMC describes enforcement, appeal, and exemption procedures for City water code violations which apply to violations of City shortage response actions. Violations are declared a public nuisance and may be subject to misdemeanor prosecution, administrative citations, and monetary penalties. Each day a violation continues constitutes a separate offense. Administrative enforcement follows a progressive approach, beginning with a warning for a first violation and escalating penalties for repeated violations within a one-year period. For chronic violations, the City may require installation of a water meter at the property owner's expense where one does not already exist.

Any person receiving an administrative citation may appeal the action by submitting a written request to the City Clerk within ten days of service of the citation. Appeals are heard by a hearing officer appointed by the City Manager, whose decision constitutes the City's final administrative determination. Exemptions from shortage response actions may be granted by the City in accordance with applicable provisions of the AMC and this Water Shortage Contingency Plan.

City of Atwater
Water Shortage Contingency Plan
June 2026
30 8 Legal Authorities
Legal Requirements:

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

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

Chapter 13 Section 13 of the AMC provides the City the authority to implement and enforce its shortage response actions. When the conditions deem it necessary, the City shall declare a water shortage emergency in accordance with Water Code Chapter 3 (commencing with Section 350) of Division 1 general provision regarding water shortage emergencies. Because the City is also the water supplier, City staff can coordinate the possible proclamation of a local emergency under California Government Code, California Emergency Services Act (Article 2, Section 8558).

CWC Division 1, Section 350 provides that:
“…The governing body of a distributor of a public water supply…shall declare a water shortage emergency condition to prevail within the area served by such distributor whenever it finds and determines that the ordinary demands and requirements of water consumers cannot be satisfied without depleting the water supply of the distributor to the extent that there would be insufficient water for human consumption, sanitation, and fire protection.”
Declaration of a water shortage emergency under this authority triggers implementation of the communication protocols described in Section 6 and the compliance and enforcement procedures described in Section 7 of this WSCP.

City of Atwater
Water Shortage Contingency Plan
June 2026
31 9 Financial Consequences of WSCP
Legal Requirements:

Water Code Section 10632(a)(8)
A description of the financial consequences of, and responses for, drought conditions, including, but not limited to, all of the following:
(A) A description of potential revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4).
(B) A description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4). (C) A description of the cost of compliance with Chapter 3.3 (commencing with Section 365) of Division

1. Revenues required to operate and maintain the City’s water system are generated through customer water rates. The City has adopted a water rate that was effective on February 1, 2019. Rate increases were increased on July 1st each year of the notice period from fiscal year end (FYE) 2019 to FYE 2023. The adopted water rate consists of fixed charges for metered and non-metered customers and water commodity rates.

During periods when water shortage response actions are implemented, overall water sales revenues are expected to decline as a result of reduced water consumption. However, the costs for operating the water system will not correspondingly decrease. There may also be additional costs associated with implementing the shortage response actions and enforcing compliance. The City annually adopts a budget for the upcoming fiscal year for the water enterprise funds. The budget summarizes the projected revenues and expenses for the City’s water production and distribution system for the upcoming fiscal year and the amended budget for the previous fiscal year. To mitigate reductions in revenue and increases in expenses associated with reduced consumption, the City may decide to use financial reserves, defer capital replacement projects or operations and maintenance activities, and/or re-evaluate the water rates to implement a drought rate structure or surcharge.

Compliance costs associated with Chapter 3.3 (commencing with Section 365) of Division 1 of the CWC are not anticipated to be significant. If necessary, the City may implement additional financial strategies to address potential revenue shortfalls resulting from reduced water sales. These strategies may include the use of financial reserves, deferral of capital improvement projects, reductions in current and future operation and maintenance expenditures, and completion of a future water rate study.

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Water Shortage Contingency Plan
June 2026
32 10 Monitoring and Reporting
Legal Requirements:

Water Code Section 10632(a)(9)
For an urban retail water supplier, monitoring and reporting requirements and procedures that ensure appropriate data is collected, tracked, and analyzed for purposes of monitoring customer compliance and to meet state reporting requirements.

The City’s water system has over 90 percent of all services equipped with water meters through individual customer connections. Metering data are used as primary tools for monitoring water use, assessing compliance with water shortage response actions, and supporting reporting requirements associated with this WSCP.

Water use data will be evaluated regularly to determine whether demand reduction goals associated with declared water shortage levels are being achieved. If reduction targets are not met during implementation of the WSCP at any water shortage stage, the City Council will be notified and recommended additional or more aggressive response actions, as appropriate.

Monitoring results may also be used to evaluate the effectiveness of WSCP measures and to identify opportunities for improvement. If revisions to the WSCP are determined to be necessary to better achieve demand reduction objectives or address changing conditions, the City will update the WSCP in accordance with the procedures described in Section 11 and make the revised plan available as described in Section

13.

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Water Shortage Contingency Plan
June 2026
33 11 WSCP Refinement Procedures
Legal Requirements:

Water Code Section 10632(a)(10)
Reevaluation and improvement procedures for systematically monitoring and evaluating the functionality of the water shortage contingency plan in order to ensure shortage risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented as needed.

This WSCP is intended to function as an adaptive management document and may be refined as necessary to ensure that City’s shortage response actions and mitigation strategies remain effective and achieve the intended outcomes. Based on monitoring activities described in Section 10, and the compliance and enforcement results described in Section 7, the City may adjust response actions and revise this WSCP to address changing conditions, implementation challenges, or observed performance.

When revisions to the WSCP are proposed, the updated plan will undergo the adoption process described in Section 13, including consideration by the City Council and distribution to Merced County, City customers, and the general public, as applicable.

Feedback from the City staff and the public is an important component of the WSCP refinement process.

The City will seek input from staff who regularly interact with customers and implement water shortage response actions to assess the practicality and effectiveness of existing measures and to identify potential improvements or new actions.

Customer water use data may be evaluated by customer sector or by individual account to assess the effectiveness of demand reduction measures and compliance trends. The City will track water use violations and may evaluate their frequency and characteristics to identify restrictions that may be difficult for customers to comply with, as well as demand reduction actions that are particularly effective.

The City will also seek input from customers and the general public through its website and during regularly scheduled City Council meetings to inform future refinements to the WSCP.

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Water Shortage Contingency Plan
June 2026
34 12 Special Water Feature Distinction
Legal Requirements:

Water Code Section 10632 (b)
For purposes of developing the water shortage contingency plan pursuant to subdivision (a), an urban water supplier shall analyze and define water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas, as defined in subdivision (a) of Section 115921 of the Health and Safety Code.

In accordance with Water Code Section 10632 (b), swimming pools and spas are considered different from other water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains. The City follows the definition of a swimming pool found in the Swimming Pool Safety Act.

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Water Shortage Contingency Plan
June 2026
35 13 Plan Adoption, Submittal and Availability
Legal Requirements:

Water Code Section 10632(c)
The urban water supplier shall make available the water shortage contingency plan prepared pursuant to this article to its customers and any city or county within which it provides water supplies no later than 30 days after adoption of the water shortage contingency plan.

Water Code Section 10642
…Prior to adopting either [UWMP and WSCP], the urban water supplier shall make both the plan [UWMP] and water shortage contingency plan available for public inspection and shall hold a public hearing or hearings thereon…After the hearing or hearings, the plan [UWMP] or water shortage contingency plan shall be adopted as prepared or as modified after the hearing or hearings.

Water Code Section 10640
(b) …The supplier shall likewise periodically review the water shortage contingency plan as required by paragraph (10) of subdivision (a) of Section 10632 and any amendments or changes required as a result of that review shall be adopted pursuant to this article [Article 3 Sections 10640 -10645] Water Code Section 10644(a)(2)(b)
If an urban water supplier revises its water shortage contingency plan the supplier shall submit to the department a copy of it water shortage contingency plan prepared pursuant to subdivision (a) of Section 10632 [required elements of a WSCP] no later than 30 days after adoption, in accordance with protocols for submission and using electronic reporting tools developed by the department.

This WSCP is adopted concurrently with the City’s 2025 UWMP, by separate resolution. Prior to adoption, a duly noticed public hearing was conducted on June 22, 2026, at the City Council Chambers at 750 Bellevue Road, Atwater, California. During this hearing, City water users and members of the general public were given an opportunity to review the 2025 WSCP and ask questions. A hard copy and electronic copy of this WSCP will be submitted to DWR within 30 days of adoption. Refer to Appendix B for public notices and outreach efforts along with the notices’ submittal dates in accordance with CWC requirements.

No later than 30 days after submittal to DWR, copies of this WSCP will be available at the City’s offices. A copy will also be provided to Merced County. An electronic copy of this WSCP will also be available for public review and download on the City’s website. A copy of the City resolution is included in Appendix C.

City of Atwater
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June 2026
A
Appendix A
Merced County Multi-Jurisdictional Hazard Mitigation Plan

MULTI-JURISDICTIONAL

HAZARD MITIGATION PLAN
2021-2026

Merced County Multi-Jurisdictional Hazard Mitigation Plan Table of Contents
2021-2026 Update Page i

TABLE OF CONTENTS
1 Introduction .......................................................................................................................................................................1-1

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

1.2 State and Local Regulatory Framework .................................................................................................1-1

1.3 Background and Scope.................................................................................................................................1-1

1.4 Multi-Jurisdictional Planning......................................................................................................................1-3

1.5 Plan Organization............................................................................................................................................1-3 2 Community Profile and Capability Assessment...................................................................................................2-1

2.1 History .................................................................................................................................................................2-1

2.2 Geography and Climate................................................................................................................................2-3

2.3 Economy .............................................................................................................................................................2-3

2.4 Population..........................................................................................................................................................2-4

2.5 County’s Mitigation Capabilities ...............................................................................................................2-5

2.5.1 Regulatory Mitigation Capabilities ..........................................................................................2-6

2.5.2 Administrative and Technical Mitigation Capabilities......................................................2-9

2.5.3 Fiscal Mitigation Capabilities .................................................................................................. 2-11

2.5.4 Other Mitigation Programs and Partnerships.................................................................. 2-11

2.5.5 Opportunities for Enhancement............................................................................................ 2-12 3 Planning Process ..............................................................................................................................................................3-1

3.1 Background on Mitigation Planning in Merced County..................................................................3-1

3.2 What’s New in the Plan Update ................................................................................................................3-1

3.2.1 Plan Section Review and Analysis – 2021 Update.............................................................3-2

3.3 Multi-Jurisdictional Participation ..............................................................................................................3-4

3.4 Planning Process .............................................................................................................................................3-5

3.4.1 Phase 1: Organize Resources.....................................................................................................3-6

3.4.2 Planning Step 3: Coordinate with Other Departments and Agencies .................... 3-12

3.4.3 Phase 2: Assess Risks.................................................................................................................. 3-15

3.4.4 Phase 3: Develop the Mitigation Plan ................................................................................. 3-16

3.4.5 Phase 4: Implement the Plan and Monitor Progress..................................................... 3-16 4 Hazard Identification and Risk Assessment...........................................................................................................4-1

4.1 Hazard Identification .....................................................................................................................................4-2

4.1.1 Overall Hazard Significance Summary ...................................................................................4-3

4.1.2 Non-Profiled Hazards ...................................................................................................................4-4

4.1.3 Disaster Declaration History.......................................................................................................4-5

4.1.4 Climate Change Considerations Summary...........................................................................4-6

4.1.5 Overview of Hazard Identification and Risk Assessment................................................4-7 Asset Summary .................................................................................................................................................................4-8

4.1.6 Assets Exposure...............................................................................................................................4-8

4.2 Hazard Analysis and Risk Summary...................................................................................................... 4-21

4.2.1 Dam Incidents............................................................................................................................... 4-21

4.2.2 Drought........................................................................................................................................... 4-35

4.2.3 Earthquake ..................................................................................................................................... 4-47

4.2.4 Flood & Levee Failure................................................................................................................ 4-67

4.2.5 Landslide......................................................................................................................................... 4-87

4.2.6 Severe Weather: General .......................................................................................................... 4-93

4.2.7 Severe Weather: Extreme Temperatures: Freeze and Extreme Heat....................... 4-94

4.2.8 Severe Weather: Dense Fog ..................................................................................................4-101

Merced County Multi-Jurisdictional Hazard Mitigation Plan Table of Contents
2021-2026 Update Page ii

4.2.9 Severe Weather: Heavy Rain .................................................................................................4-106

4.2.10 Severe Weather: High Wind/Tornado...............................................................................4-115

4.2.11 Subsidence...................................................................................................................................4-127

4.2.12 Wildfire ..........................................................................................................................................4-133

4.2.13 Hazardous Materials Incidents.............................................................................................4-151

4.2.14 Cyber Attack ................................................................................................................................4-160

4.2.15 Agricultural Pests and Disease .............................................................................................4-165

4.2.16 Pandemics/Epidemics..............................................................................................................4-171 5 Mitigation Strategy .........................................................................................................................................................5-1

5.1 Mitigation Goals and Objectives...............................................................................................................5-1

5.1.1 Continued Compliance with the National Flood Insurance Program (NFIP) ..........5-3

5.2 Identification and Analysis of Mitigation Actions ..............................................................................5-4

5.2.1 Prioritization Process.....................................................................................................................5-5

5.3 Mitigation Strategy Action Plan ................................................................................................................5-7

5.3.1 Progress on Previous Mitigation Actions..............................................................................5-7

5.3.2 Updated Action Plan .....................................................................................................................5-8 6 Plan Adoption, Implementation, and Maintenance ...........................................................................................6-1

6.1 Adoption.............................................................................................................................................................6-1

6.2 Implementation ...............................................................................................................................................6-1

6.2.1 Role of the Hazard Mitigation Planning Team in Implementation and Maintenance .....................................................................................................................................................6-2

6.3 Maintenance .....................................................................................................................................................6-2

6.3.1 Maintenance Schedule.................................................................................................................6-2

6.3.2 Maintenance and Evaluation Process.....................................................................................6-3

6.3.3 Incorporation into Existing Planning Mechanisms............................................................6-4

6.3.4 Continued Public Involvement..................................................................................................6-5 7 Plan Adoption ...................................................................................................................................................................7-1

7.1 Element E.1 Formal Adoption Documentation....................................................................................7-1 8 References ..........................................................................................................................................................................8-1

LIST OF APPENDICES
Appendix A: Planning Team
Appendix B: Planning Process Documentation
Appendix C: Approval and Adoption
Appendix D: Mitigation Categories and Alternatives
Appendix E: Annual Progress Meeting Agenda and Report Template Appendix F: Outreach Strategy

LIST OF ANNEXES
Annex A: City of Atwater
Annex B: City of Dos Palos
Annex C: City of Gustine
Annex D: City of Livingston
Annex E: City of Los Banos
Annex F: City of Merced

Merced County Multi-Jurisdictional Hazard Mitigation Plan Introduction
2021-2026 Update Page 1-1
1 INTRODUCTION

1.1 Purpose of Plan
Merced County including the participating jurisdictions of the have prepared this multi-jurisdictional hazard mitigation plan (MJHMP) to guide hazard mitigation planning to better protect the people and property of the County from the effects of hazard events. This plan demonstrates the community’s commitment to reducing risks from hazards and serves as a tool to help decision makers direct mitigation activities and resources. This plan was also developed to make Merced County and the participating jurisdictions eligible for certain federal disaster assistance, specifically, the Federal Emergency Management Agency’s (FEMA) Hazard Mitigation Assistance (HMA) grants including the Hazard Mitigation Grant Program (HMGP), Flood Mitigation Assistance (FMA) and Building resilient Infrastructure and Communities program, as well as to make the County and jurisdictions more disaster resistant. This plan demonstrates the County’s commitment to reducing risks from hazards and serves as a tool to help decision makers direct mitigation activities and resources.

1.2 State and Local Regulatory Framework
The MJHMP was prepared consistent with the Health and Safety Element of the Merced County General Plan, as the planning effort covers common overlapping natural hazard issues and mutually reinforcing policies and implementation programs. The MJHMP and Health and Safety Element are considered complimentary documents that address natural hazards, and both planning documents contain goals, policies, and project actions or implementation programs to enhance the County’s mitigation efforts related to public safety.

California Government Code Section 65302.10, also referred to as Assembly Bill (AB) 2140 encourages California counties and cities to adopt their current, FEMA-approved LHMPs into the Safety Element of their General Plan. This adoption by reference or incorporation of the MJHMP into the Safety Element of the General Plan follows plan approval and makes Merced County and each participating jurisdiction eligible to be considered for part or all of its local share costs on eligible public assistance funding to be provided by the state through the California Disaster Assistance Act (CDAA). The CDAA allows the state to pay up to 18.75 percent of the non-federal share that would otherwise fall upon the county or city to pay for public assistance projects. The legislature passed AB 2140 to provide additional funding after a disaster occurs. The local share is 25 percent of the total project cost; therefore, the legislation allows city and counties that comply to be eligible for only the remaining local share (6.25 percent).

AB 2140 is an optional state incentive to help counties and cities become more resilient to natural hazards. Compliance with AB 2140 also expires when the MJHMP expires, and the County must re-adopt the plan into the Safety Element during update cycles to ensure continued compliance and funding eligibility. Additionally, each participating jurisdiction in Merced County must adopt their annex into their own General Plan Safety Element, as the annex jurisdictions are not covered under the County’s General Plan Safety Element adoption.

1.3 Background and Scope
Each year in the United States, disasters take the lives of hundreds of people and injure thousands more.

Nationwide, taxpayers pay billions of dollars annually to help communities, organizations, businesses, and individuals recover from disasters. These monies only partially reflect the true cost of disasters, because

Merced County Multi-Jurisdictional Hazard Mitigation Plan Introduction
2021-2026 Update Page 1-2
additional expenses to insurance companies and nongovernmental organizations are not reimbursed by tax dollars. Many disasters are predictable, and much of the damage caused by these events can be alleviated or even eliminated.

Hazard mitigation is defined by FEMA as “any sustained action taken to reduce or eliminate long-term risk to human life and property from a hazard event.” The results of a three-year, congressionally mandated independent study to assess future savings from mitigation activities provides evidence that mitigation activities are highly cost-effective. On average, each dollar spent on mitigation saves society an average of $6 in avoided future losses in addition to saving lives and preventing injuries (Natural Hazard Mitigation Saves: 2017 Interim Report).

Hazard mitigation planning is the process through which hazards that threaten communities are identified; likely impacts are determined, prioritized and implemented. This plan continues the hazard mitigation planning process for Merced County, the unincorporated county, and the participating cities of Atwater, Dos Palos, Gustine, Livingston, Los Banos, and Merced. The plan identifies natural and human caused hazards and risks within Merced County, and identifies the hazard mitigation strategy to reduce vulnerability and make the communities of Merced County more disaster resistant and sustainable.

Information in this plan can be used to help guide and coordinate mitigation activities and local land use decisions. Proactive mitigation planning will help reduce the cost of disaster response and recovery to the community and its property owners by protecting critical community facilities, reducing liability exposure, and minimizing overall community impacts and disruption. The Merced County planning area has been affected by hazards in the past and is thus committed to reducing future disaster impacts and maintaining eligibility for federal funding.

This plan underwent a comprehensive update in 2021 in fulfillment of the five-year update requirement.

Several factors underscore the need for this planning effort:
● Merced County is exposed to hazards that have caused past damage. ● Limited local resources make it difficult to be pre-emptive in reducing risk. Eligibility for federal financial assistance is paramount to promote successful hazard mitigation in the area. ● Merced County and its partners participating in this plan want to be proactive in preparing for the probable impacts of natural hazards.

This MJHMP was originally prepared in 2014, pursuant to the requirements of the Disaster Mitigation Act of 2000 (Public Law 106-390) and the implementing regulations set forth by the Interim Final Rule published in the Federal Register on February 26, 2002 (44 CFR §201.6) . Hereafter, these requirements and regulations will be referred to collectively as the Disaster Mitigation Act, or DMA. While the act emphasized the need for mitigation plans and more coordinated mitigation planning and implementation efforts, the regulations established the requirements that local hazard mitigation plans (LHMPs) must meet in order for a local jurisdiction to be eligible for certain federal disaster assistance and hazard mitigation funding under the Robert T. Stafford Disaster Relief and Emergency Act (Public Law 93-288).

Because the Merced County planning and response area is subject to many kinds of hazards, access to these programs is vital. As a result, the County and their participating jurisdictions completed a comprehensive plan update process in 2021 to bring the MJHMP into compliance with recent legislation related to climate change and to address new human health and natural hazards and emerging concerns.

Information in this plan will be used to help guide and coordinate mitigation activities and decisions for local land use policy in the future. Proactive mitigation planning will help reduce the cost of disaster response and recovery to the community and its property owners by protecting critical community facilities, reducing liability exposure, and minimizing overall community impacts and disruption. The Merced County planning area has been affected by hazards in the past and is thus committed to reducing future disaster impacts and maintaining eligibility for federal funding.

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2021-2026 Update Page 1-3
This hazard mitigation plan identifies resources, information, and strategies for reducing risk from natural hazards. Elements and strategies in the plan were selected because they meet a program requirement and because they best meet the needs of the planning partners and their citizens. One of the benefits of multi-jurisdictional planning is the ability to pool resources and eliminate redundant activities within a planning area that has uniform risk exposure and vulnerabilities. FEMA encourages multi-jurisdictional planning under its guidance for the DMA. This plan will help guide and coordinate mitigation activities throughout the planning area. The plan was developed to meet the following objectives:
● Meet or exceed requirements of the DMA.
● Enable all planning partners to use federal grant funding to reduce risk through mitigation. ● Meet the needs of each planning partner as well as state and federal requirements. ● Create a risk assessment that focuses on Merced County hazards of concern. ● Create a single planning document that integrates all planning partners into a framework that supports partnerships within the County and puts all partners on the same planning cycle for future updates.
● Meet the planning requirements of FEMA’s Community Rating System (CRS), allowing planning partners that may choose to participate in the CRS program to enhance their CRS classifications. ● Coordinate existing plans and programs so that high-priority initiatives and projects to mitigate possible disaster impacts are funded and implemented.

1.4 Multi-Jurisdictional Planning
All citizens and businesses of Merced County are the ultimate beneficiaries of this MJHMP. The plan reduces risk for those who live in, work in, and visit the County. It also provides a viable planning framework for all foreseeable natural hazards that may impact the County. Participation in development of the plan by key stakeholders in the County helps ensure that outcomes will be mutually beneficial. The resources and background information in the plan are applicable countywide, and the plan’s goals and recommendations can lay groundwork for the development and implementation of local mitigation activities and partnerships.

The Merced County MJHMP is a multi-jurisdictional plan that geographically covers everything within Merced County’s jurisdictional boundaries (hereinafter referred to as the planning area). Unincorporated Merced County and the following jurisdictions participated in the 2021 update planning process:
● Merced County
● City of Atwater
● City of Dos Palos
● City of Gustine
● City of Livingston
● City of Los Banos
● City of Merced
The cities of Dos Palos and Gustine are new participating jurisdictions as part of the 2021 MJHMP update process, and this is their first hazard mitigation plan. The City of Merced also prepared a stand-alone LHMP in 2015 and is now participating in the MJHMP update process.

1.5 Plan Organization
● Section 1: Introduction
● Section 2: Community Profile and Capability Assessment ● Section 3: Planning Process

Merced County Multi-Jurisdictional Hazard Mitigation Plan Introduction
2021-2026 Update Page 1-4
● Section 4: Hazard Identification and Risk Assessment (HIRA) ● Section 5: Mitigation Strategy
● Section 6: Plan Adoption, Implementation and Maintenance ● Appendix A: Planning Team
● Appendix B: Planning Process Documentation
● Appendix C: Approval and Adoption
● Appendix D: Mitigation Categories and Alternatives
● Appendix E: Annual Progress Meeting Agenda and Report Template ● Appendix F: Outreach Strategy
● Appendix G: Annexes