Vernon City Council
June 16, 2026

RESOLUTION NO. 2026-033

A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF VERNON ADOPTING THE CITY OF VERNON 2025 URBAN WATER MANAGEMENT PLAN AND THE WATER

SHORTAGE CONTINGENCY PLAN
SECTION 1. Recitals.

A. The Urban Water Management Planning Act (Act), (California Water Code Section 10610, et seq.) requires designated urban water suppliers to prepare and adopt an Urban Water Management Plan (UWMP), and to update the Plan at least once every five years on or before July 1, in years ending in six and one.

B. The Act applies to public and privately-owned water suppliers that provide water for municipal purposes either directly or indirectly to more than 3,000 customers or that supply more than 3,000 acre-feet of water annually.

C. California Water Code Section 10609.60 requires water suppliers with 1,000 to 2,999 service connections to develop and maintain a Water Shortage Contingency Plan (WSCP).

D. The City is an urban water supplier within the scope of the Act and Water Code Section 10609.60, and is required to prepare, adopt, and periodically update its UWMP and its WSCP.

E. Pursuant to California Water Code Section 10621, the City has prepared an updated UWMP and WSCP, collectively referred to herein as the 2025 UWMP, in accordance with legal requirements and has undertaken certain coordination, public comment, and other procedures in relation to such UWMP and WSCP.

F. On June 1, 2026 and June 8, 2026, a public hearing of the proposed 2025 UWMP was published in the La Opinion Newspaper.

G. The City Council of the City of Vernon has heard and considered all evidence, both written and oral, presented in consideration of the proposed 2025 UWMP during its regular meeting on June 16, 2026, and finds that all persons have had the opportunity to be heard or to file written comments to the proposed plan.

NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF VERNON AS FOLLOWS:

SECTION 2. The City Council of the City of Vernon hereby finds and determines that the above recitals are true and correct.

SECTION 3. The City Council of the City of Vernon hereby finds that this action Resolution No. 2026-033

_______________________
is exempt under the California Environmental Quality Act (CEQA) in accordance with Water Code Section 10652, which exempts the preparation and adoption of the UWMP and WSCP from CEQA requirements, and CEQA Guideline Section 15061(b)(3), the general rule that CEQA only applies to activities that may have a significant effect on the environment, because the plans referenced herein are merely updates of the existing 2020 UWMP.

SECTION 4. The City Council of the City of Vernon further finds that all persons have had the opportunity to be heard or to file written comments to the proposed 2025 UWMP and, after due consideration of any and all evidence submitted at the public hearing, hereby adopts the City of Vernon 2025 UWMP, copies of which are attached hereto as Exhibit A.

SECTION 5. The City Council of the City of Vernon hereby authorizes and directs the General Manager of the Public Utilities Department to implement the 2025 UWMP and carry out effective and equitable water conservation programs.

SECTION 6. The City Council of the City of Vernon hereby authorizes and directs the General Manager of the Public Utilities Department to submit a copy of the 2025 UWMP within 30 days to the necessary parties in accordance with California Water Code Section 10644.

SECTION 7. All resolutions or parts of resolutions, specifically Resolution No. 2021-018, not consistent with or in conflict with this resolution are hereby repealed.

SECTION 8. Severability. If any provision of this Resolution or the application thereof to any person or circumstance is held invalid, such invalidity shall not affect other provisions or applications, and to this end, the provisions of this Resolution are declared to be severable.
/ / /
/ / /
/ / /
/ / /
Resolution No. 2026-033

_______________________
SECTION 9. The City Clerk, or Deputy City Clerk, shall certify the passage and adoption of this resolution and enter it into the book of original resolutions.

APPROVED AND ADOPTED June 16, 2026.

Melissa Ybarra, Mayor
ATTEST:

GENOVEVA ROCHA, City Clerk
APPROVED AS TO FORM:

ZAYNAH MOUSSA-MILWARD,
City Attorney
Resolution No. 2026-033

_______________________

CERTIFICATION

STATE OF CALIFORNIA )
COUNTY OF LOS ANGELES ) ss.

CITY OF VERNON )
I do hereby certify that the attached is a true copy of Resolution No. 2026-033 that was passed and adopted at the Regular Meeting held on June 16, 2026, by the following vote:

AYES:

NOES:

ABSENT:

ABSTAIN:
__________________________
GENOVEVA ROCHA, City Clerk
M AY 2026 FINAL D RAFT
Resolution No. 2026-033

___________________
Exhibit A
City of Vernon
2025
Urban Water Management Plan
Resolution No. 2026-033

___________________

TABLE OF CONTENTS
Page
i
CHAPTER 1 ............................................................................................................................ 1-1 URBAN WATER MANAGEMENT PLAN INTRODUCTION AND OVERVIEW ............................... 1-1 UPDATED GUIDANCE FOR 2025 URBAN WATER MANAGEMENT PLAN .......................... 1-4 SUBMITTAL TABLES .......................................................................................................... 1-5

1.2.1 INCLUSION OF SUBMITTAL TABLES .................................................................... 1-5

1.2.2 OPTIONAL PLANNING TOOL ............................................................................... 1-6 RECOMMENDED UWMP ORGANIZATION ....................................................................... 1-6 UWMPS IN RELATION TO OTHER EFFORTS ...................................................................... 1-7

1.4.1 DEMONSTRATION OF CONSISTENCY WITH THE DELTA PLAN FOR PARTICIPANTS IN COVERED ACTIONS ................................................................. 1-7 DEPARTMENT OF WATER RESOURCES’ REVIEW PROCESS .............................................. 1-9 UWMPS AND GRANT OR LOAN ELIGIBILITY ..................................................................... 1-9 TIPS FOR UWMP PREPARERS ......................................................................................... 1-11 CHAPTER 2 ............................................................................................................................ 2-1 URBAN WATER MANAGEMENT PLAN PREPARATION ........................................................... 2-1 BASIS FOR PREPARING A PLAN ........................................................................................ 2-2

2.1.1 SUPPLIERS WITH BOTH WHOLESALE AND RETAIL SALES .................................... 2-3

2.1.2 PUBLIC WATER SYSTEMS .................................................................................... 2-3 INDIVIDUAL OR REGIONAL PLANNING ............................................................................ 2-4

2.2.1 REGIONAL REPORTING ........................................................................................ 2-4 FISCAL OR CALENDAR YEAR AND UNITS OF MEASURE .................................................... 2-5

2.3.1 FISCAL OR CALENDAR YEAR ................................................................................ 2-5

2.3.2 UNITS OF MEASURE ............................................................................................ 2-5 COORDINATION AND OUTREACH .................................................................................... 2-6

2.4.1 WHOLESALE AND RETAIL COORDINATION ......................................................... 2-6

2.4.2 COORDINATION WITH OTHER AGENCIES AND THE COMMUNITY ..................... 2-6

2.4.3 NOTICE TO CITIES AND COUNTIES ...................................................................... 2-7 SUBMITTAL TABLES .......................................................................................................... 2-7

2.5.1 SUBMITTAL TABLE 2-1: PWSs ............................................................................. 2-8

2.5.2 SUBMITTAL TABLE 2-2: PLAN TYPE IDENTIFICATION .......................................... 2-9

2.5.3 SUBMITTAL TABLE 2-3: SUPPLIER INFORMATION ............................................ 2-10

2.5.4 SUBMITTAL TABLE 2-4: WATER SUPPLIER INFORMATION EXCHANGE ............ 2-11 CHAPTER 3 ............................................................................................................................ 3-1 SERVICE AREA DESCRIPTION ................................................................................................. 3-1 GENERAL DESCRIPTION .................................................................................................... 3-2 SERVICE AREA BOUNDARY MAPS .................................................................................... 3-3 SERVICE AREA CLIMATE ................................................................................................... 3-4 SERVICE AREA POPULATION AND DEMOGRAPHICS ........................................................ 3-6

3.4.1 SERVICE AREA POPULATION ............................................................................... 3-6

3.4.2 OTHER SOCIAL, ECONOMIC, AND DEMOGRAPHIC FACTORS ............................. 3-8 Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
Page
ii
LAND USES WITHIN SERVICE AREA .................................................................................. 3-9 SUBMITTAL TABLES ........................................................................................................ 3-10

3.6.1 SUBMITTAL TABLE 3-1: POPULATION - CURRENT AND PROJECTED ................. 3-10 CHAPTER 4 ............................................................................................................................ 4-1 WATER USE CHARACTERIZATION .......................................................................................... 4-1 NON-POTABLE VERSUS POTABLE WATER USE ................................................................ 4-2 PAST, CURRENT, AND PROJECTED WATER USE BY SECTOR ............................................. 4-2

4.2.1 WATER-USE SECTORS LISTED IN WATER CODE .................................................. 4-4

4.2.2 OPTIONAL WATER-USE SECTORS IN ADDITION TO THOSE LISTED IN WATER CODE ...................................................................................................... 4-5

4.2.3 PAST WATER USE ................................................................................................ 4-5

4.2.4 CURRENT WATER USE ......................................................................................... 4-6

4.2.5 PROJECTED WATER USE ...................................................................................... 4-7 DISTRIBUTION SYSTEM WATER LOSS ............................................................................. 4-17

4.3.1 PREVIOUS FIVE YEARS DISTRIBUTION SYSTEM LOSSES .................................... 4-18

4.3.2 PROGRESS TOWARD MEETING THE WATER LOSS PERFORMANCE STANDARD ........................................................................................................ 4-19 SUBMITTAL TABLES ........................................................................................................ 4-21

4.4.1 TABLE 4-1: TOTAL USES FOR POTABLE AND NON-POTABLE WATERACTUAL ............................................................................................................. 4-21

4.4.2 TABLE 4-2: TOTAL USES OF POTABLE AND NON-POTABLE WATER— PROJECTED ........................................................................................................ 4-22

4.4.3 TABLE 4-3: INCLUSION IN WATER-USE PROJECTIONS ...................................... 4-23

4.4.4 OPTIONAL TABLE 4-4: PASSIVE WATER SAVINGS PROJECTION ........................ 4-24

4.4.5 TABLE 4-5: WATER LOSS AUDIT REPORTING .................................................... 4-24

4.4.6 TABLE 4-6: PROGRESS TOWARD 2028 WATER LOSS STANDARD ..................... 4-25 CHAPTER 5 ............................................................................................................................ 5-1 SB X7-7 BASELINE, 2020 TARGETS, AND 2025 REPORTING .................................................... 5-1 REPORTING REQUIREMENTS FOR WHOLESALE SUPPLIERS ............................................. 5-2 REPORTING REQUIREMENTS FOR RETAIL SUPPLIERS ...................................................... 5-2

5.2.1 SUPPLIER WAS NOT AN URBAN RETAIL WATER SUPPLIER ................................. 5-3

5.2.2 SUPPLIER MET 2020 TARGET IN 2020 ................................................................. 5-3

5.2.3 SUPPLIER DID NOT MEET 2020 TARGET IN 2020—NO CHANGE TO SERVICE AREA ..................................................................................................... 5-4

5.2.4 SUPPLIER DID NOT MEET 2020 TARGET—CHANGE TO SERVICE AREA SINCE 2020 .......................................................................................................... 5-4

5.2.5 FUNDING ELIGIBILITY .......................................................................................... 5-4

5.2.6 NEXUS TO STATE WATER BOARD URBAN WATER-USE OBJECTIVES (NOT REQUIRED FOR UWMPs) ..................................................................................... 5-5 SUBMITTAL TABLES .......................................................................................................... 5-7 Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
Page
iii
CHAPTER 6 ............................................................................................................................ 6-1 NORMAL-YEAR WATER SUPPLY CHARACTERIZATION ........................................................... 6-1 WATER SUPPLY ANALYSIS OVERVIEW ............................................................................. 6-2

6.1.1 SPECIFIC ANALYSIS APPLICABLE TO ALL WATER SUPPLY SOURCES .................... 6-4

6.1.2 SPECIAL CONDITIONS .......................................................................................... 6-6 WATER SUPPLY CHARACTERIZATION ............................................................................... 6-7

6.2.1 PURCHASED OR IMPORTED WATER ................................................................... 6-7

6.2.2 GROUNDWATER................................................................................................ 6-10

6.2.3 SURFACE WATER ............................................................................................... 6-18

6.2.4 STORMWATER .................................................................................................. 6-18

6.2.5 WASTEWATER AND RECYCLED WATER............................................................. 6-19

6.2.6 DESALINATED WATER OPPORTUNITIES ............................................................ 6-25

6.2.7 WATER EXCHANGES AND TRANSFERS .............................................................. 6-25

6.2.8 SUPPLY FROM STORAGE ................................................................................... 6-27

6.2.9 OTHER ............................................................................................................... 6-27

6.2.10 FUTURE WATER PROJECTS ................................................................................ 6-27 ENERGY USE ................................................................................................................... 6-28 SUBMITTAL TABLES ........................................................................................................ 6-31

6.4.1 TABLE 6-1: GROUNDWATER VOLUME PUMPED ............................................... 6-31

6.4.2 TABLE 6-2: WASTEWATER COLLECTED WITHIN SERVICE AREA ........................ 6-32

6.4.3 TABLE 6-3: WASTEWATER TREATMENT AND OUTCOMES WITHIN UWMP SERVICE AREA IN 2025 ...................................................................................... 6-33

6.4.4 TABLE 6-4: RECYCLED WATER DIRECT BENEFICIAL USES WITHIN SERVICE AREA .................................................................................................................. 6-34

6.4.5 TABLE 6-5: 2020 UWMP RECYCLED WATER-USE PROJECTION COMPARED TO 2025 ACTUAL ........................................................................... 6-35

6.4.6 TABLE 6-6: METHODS TO ENCOURAGE FUTURE RECYCLED WATER USE ......... 6-36

6.4.7 TABLE 6-7: EXPECTED FUTURE WATER SUPPLY PROJECTS OR PROGRAMS ..... 6-37

6.4.8 TABLE 6-8: WATER SUPPLIES—ACTUAL ............................................................ 6-37

6.4.9 OPTIONAL TABLE 6-8DS: SOURCE DESALINATION BY SUPPLIER ...................... 6-39

6.4.10 TABLE 6-9: WATER SUPPLIES—PROJECTED ...................................................... 6-40 CHAPTER 7 ............................................................................................................................ 7-1 WATER SERVICE RELIABILITY AND DROUGHT RISK ASSESSMENT .......................................... 7-1 CONSTRAINTS ON WATER SOURCES CONSIDERATIONS .................................................. 7-3

7.1.1 SERVICE RELIABILITY – CONSTRAINTS ON WATER SOURCES .............................. 7-3 WATER SERIVCE RELIABILITY ASSESSMENT ..................................................................... 7-4

7.2.1 WSRA YEAR-TYPE CHARACTERIZATION .............................................................. 7-6

7.2.2 WSRA SUPPLY AND DEMAND COMPARISON ..................................................... 7-7

7.2.3 WSRA DESCRIPTION OF MANAGEMENT TOOLS AND OPTIONS ......................... 7-9 DROUGHT RISK ASSESSMENT ........................................................................................ 7-10

7.3.1 DRA, DATA, METHODS, AND BASIS FOR WATER SHORTAGE CONDITIONS ...... 7-11 Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
Page
iv

7.3.2 DRA INDIVIDUAL WATER SOURCE RELIABILITY ................................................ 7-13

7.3.3 DRA TOTAL WATER SUPPLY AND USE COMPARISON ....................................... 7-15 OPTIONAL PLANNING TOOL WORKBOOK ...................................................................... 7-15 SUBMITTAL TABLES ........................................................................................................ 7-16

7.4.1 OPTIONAL TABLE 7-1: BASIS OF WATER-YEAR DATA (WSRA) .......................... 7-16

7.4.2 TABLE 7-2: NORMAL-YEAR SUPPLY AND USE COMPARISON ............................ 7-17

7.4.3 TABLE 7-3: SINGLE-DRY-YEAR SUPPLY AND USE COMPARISON ....................... 7-18

7.4.4 TABLE 7-4: MULTIPLE DRY YEARS SUPPLY AND USE COMPARISON ................. 7-19

7.4.5 TABLE 7-5: FIVE-YEAR DROUGHT RISK ASSESSMENT ........................................ 7-20 CHAPTER 8 ............................................................................................................................ 8-1 WATER SHORTAGE CONTINGENCY PLAN .............................................................................. 8-1 WATER SUPPLY RELIABILITY ANALYSIS ............................................................................ 8-3 ANNUAL WATER SUPPLY AND DEMAND ASSESSMENT PROCEDURES ............................ 8-4

8.2.1 DECISION-MAKING PROCESS .............................................................................. 8-5

8.2.2 DATA METHODOLOGIES ..................................................................................... 8-6 SIX STANDARD WATER SHORTAGE LEVELS ...................................................................... 8-7 SHORTAGE RESPONSE ACTIONS ...................................................................................... 8-9

8.4.1 SUPPLY AUGMENTATION .................................................................................. 8-10

8.4.2 DEMAND REDUCTION ....................................................................................... 8-11

8.4.3 OPERATIONAL CHANGES .................................................................................. 8-22

8.4.4 ADDITIONAL MANDATORY RESTRICTIONS ....................................................... 8-23

8.4.5 EMERGENCY RESPONSE PLAN .......................................................................... 8-24

8.4.6 SEISMIC RISK ASSESSMENT AND MITIGATION PLAN ........................................ 8-26

8.4.7 SHORTAGE RESPONSE ACTION EFFECTIVENESS ............................................... 8-29 COMMUNICATION PROTOCOLS .................................................................................... 8-31 COMPLIANCE AND ENFORCEMENT ............................................................................... 8-32 LEGAL AUTHORITIES....................................................................................................... 8-33 FINANCIAL CONSEQUENCES OF WSCP .......................................................................... 8-34 MONITORING AND REPORTING ..................................................................................... 8-35 WSCP REFINEMENT PROCEDURES ................................................................................. 8-36 SPECIAL WATER FEATURE DISTINCTION ........................................................................ 8-37 PLAN ADOPTION, SUBMITTAL, AVAILABILITY, AND AMENDMENT PROCEDURES......... 8-38 RESOURCES AND REFERENCES....................................................................................... 8-39 SUBMITTAL TABLES ........................................................................................................ 8-40

8.14.1 TABLE 8-1: CROSS REFERENCE FOR STANDARD VS. SUPPLIER SHORTAGE LEVELS ............................................................................................................... 8-40

8.14.2 TABLE 8-2: SUPPLY AUGMENTATION AND OTHER ACTIONS ............................ 8-41

8.14.3 TABLE 8-3: DEMAND-REDUCTION ACTIONS ..................................................... 8-42 Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
Page
v
CHAPTER 9 ............................................................................................................................ 9-1 DEMAND MANAGEMENT MEASURES ................................................................................... 9-1 DEMAND MANAGEMENT MEASURES FOR RETAIL SUPPLIERS ........................................ 9-2

9.1.1 IMPLEMENTATION OVER THE PAST FIVE YEARS ................................................. 9-2

9.1.2 IMPLEMENTATION TO ACHIEVE WATER USE TARGETS ...................................... 9-4

9.1.3 REQUIRED DEMAND MANAGEMENT MEASURES ............................................... 9-5 DEMAND MANAGEMENT MEASURES FOR WHOLESALE SUPPLIERS ............................... 9-8 CHAPTER 10 ........................................................................................................................ 10-1 PLAN ADOPTION, SUBMITTAL, AND IMPLEMENTATION ..................................................... 10-1 PLAN COMPLETION TIMELINE ....................................................................................... 10-2 NOTICE OF PLAN PREPARATION .................................................................................... 10-2 NOTICE OF PUBLIC HEARING ......................................................................................... 10-3 PUBLIC HEARING AND ADOPTION ................................................................................. 10-4 PLAN SUBMITTAL ........................................................................................................... 10-5

10.5.1 SUBMITTING A UWMP AND WATER SHORTAGE CONTINGENCY PLAN TO DWR .................................................................................................................. 10-5

10.5.2 ELECTRONIC DATA SUBMITTAL......................................................................... 10-6

10.5.3 SUBMITTING A UWMP, INCLUDING WSCP, TO THE CALIFORNIA STATE LIBRARY ............................................................................................................. 10-6

10.5.4 SUBMITTING A UWMP TO CITIES AND COUNTIES ............................................ 10-7 PUBLIC AVAILABILITY ..................................................................................................... 10-7 NOTIFICATION TO PUBLIC UTILITIES COMMISSION ....................................................... 10-8 PLAN IMPLEMENTATION ............................................................................................... 10-8 AMENDING AN ADOPTED UWMP OR WATER SHORTAGE CONTINGENCY PLAN .......... 10-8

10.9.1 AMENDING A UWMP OR WSCP ........................................................................ 10-9

10.9.2 SUBMITTING REVISED WATER SHORTAGE CONTINGENCY PLAN ..................... 10-9

CALIFORNIA DEPARTMENT OF WATER RESOURCES REVIEW OF SUBMITTED PLANS ........................................................................................................................... 10-10 SUBMITTAL TABLES ...................................................................................................... 10-10

10.11.1 SUBMITTAL TABLE 10-1: NOTIFICATION TO CITIES AND COUNTIES ............... 10-11 Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
vi

LIST OF TABLES

Table 2-1 Public Water Systems ................................................................................................................... 2-8 Table 2-2 Plan Identification Type ................................................................................................................ 2-9 Table 2-3 Supplier Information ................................................................................................................... 2-10 Table 2-4 Water Supplier Information Exchange........................................................................................ 2-11 Table 3-1 Population - Current and Projected ............................................................................................ 3-10 Table 4-1 Total Uses for Potable and Non-Potable Water - Actual ............................................................ 4-21 Table 4-2 Total Uses of Potable and Non-Potable Water - Projected ........................................................ 4-22 Table 4-4 Passive Savings Projection .......................................................................................................... 4-24 Table 4-4 Water Loss Audit Report ............................................................................................................. 4-24 Table 4-6 Progress Toward 2028 Water Loss Standard .............................................................................. 4-25 Table 5-1 SB X7-7 2020 Target Progress ....................................................................................................... 5-7 Table 6-1 Groundwater Volume Pumped ................................................................................................... 6-31 Table 6-2 Wastewater Collected Within UWMP Service Area ................................................................... 6-32 Table 6-3 Wastewater Treatment and Outcome within Service Area in 2020 ........................................... 6-33 Table 6-4 Current and Projected Recycled Water Direct Beneficial Uses Within Service Area ................. 6-34 Table 6-5 2020 UWMP Recycled Water Use Projection Compared to 2025 Actual ................................... 6-35 Table 6-6 Methods to Encourage Future Recycled Water Use ................................................................... 6-36 Table 6-7 Expected Future Water Supply Projects or Programs ................................................................ 6-37 Table 6-8 Water Supplies – Actual .............................................................................................................. 6-39 Table 6-9 Water Supplies – Projected ........................................................................................................ 6-40 Table 7-1 Basis of Water-Year Data (Reliability Assessment) ..................................................................... 7-16 Table 7-2 Normal-Year Supply and Use Comparison .................................................................................. 7-17 Table 7-3 Single-Dry-Year Supply and Use Comparison ............................................................................. 7-18 Table 7-4 Multiple Dry Years Supply and Use Comparison ........................................................................ 7-19 Table 7-5 Five-Year Drought Risk Assessment ............................................................................................ 7-20 Table 8-1 Cross-Reference for Standard vs. Supplier Shortage Levels ....................................................... 8-40 Table 8-2 Supply Augmentation and Other Actions ................................................................................... 8-41 Table 8-3 Demand Reduction Actions ........................................................................................................ 8-42 Table 10-1 Notification to Cities and Counties ........................................................................................... 10-11

Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
vii

LIST OF FIGURES
Figure 1 Water Service Area
Figure 2 Water Service Area and City Boundaries
Figure 3 Central Basin Location

Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
viii

LIST OF APPENDICES
Appendix A DWR Standardized Tables
Appendix B Completed Plan Checklist
Appendix C Demonstration of Reduced Imported Water Reliance Appendix D 60-Day Notification Letters
Appendix E Resolution 2014-51 and Resolution 2015-34
Appendix F Climate Change Considerations (Cal-Adapt Data) Appendix G Central Basin Third Amended Judgment
Appendix H Ordinance No. 995
Appendix I Ordinance No. 115
Appendix J Ordinance No. 1161
Appendix K Water Conservation Chapter (Municipal Code)
Appendix L Local Hazard Mitigation Plan
Appendix M Los Angeles County All Hazard Mitigation Plan Appendix N City Water Rates
Appendix O Resolution Adopting 2025 Plan and WSCP

Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
ix

LIST OF ACRONYMS
AB Assembly Bill
AF Acre-feet
AFY Acre-feet per year
AWWA American Water Works Association
CBMWD Central Basin Municipal Water District
CBWQPP Central Basin Water Quality Protection Program
CIMIS California Irrigation Management Information System City City of Vernon
CWC California Water Code
DACs Disadvantaged Communities
DOF Department of Finance
DPW Department of Public Works
DRA Drought Risk Assessment
DWR Department of Water Resources
ERP Emergency Response Plan
ETo Evapotranspiration
FY Fiscal Year
GCMs General Circulation Models
GIS Geographical Information Systems
GPCD Gallons per capita per day
gpm Gallons per minute
GSP Groundwater Sustainability Plan
GWMA Gateway Water Management Authority
LACSD Los Angeles County Sanitation Districts
LBWRP Long Beach Water Reclamation Plant
LCWRP Los Coyotes Water Reclamation Plant
LVL Leo J. Vander Lans Advanced Water Treatment Facility M&I Municipal and Industrial
MCL Maximum Contaminant Level
MOU Memorandum of Understanding
MSL Mean Sea Level
MWD Metropolitan Water District of Southern California
PCE Perchloroethylene
PFAS Per- and Poly-Fluoroalkyl Substances
Plan Urban Water Management Plan
RCP Representative Concentration Pathway
RRA Risk and Resilience Assessment
SB Senate Bill
SCAG Southern California Association of Governments
SGMA Sustainable Groundwater Management Act
SWRCB State Water Resources Control Board
Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
x

SWRCB-DDW State Water Resources Control Board – Division of Drinking Water SWP State Water Project
TCE trichloroethylene
TDS Total Dissolved Solids
USEPA U.S. Environmental Protection Agency
UWMP Urban Water Management Plan
VOCs Volatile Organic Compounds
WIN Water Independence Now
WRCC Western Regional Climate Center
WRD Water Replenishment District of Southern California WSAP Water Supply Allocation Plan
WSCP Water Shortage Contingency Plan
WSRA Water Supply Reliability Assessment
WUCA Water Utility Climate Alliance
WUE Water Use Efficiency

Resolution No. 2026-033

___________________

TABLE OF CONTENTS
(Continued)
xi

<Page Intentionally Left Blank>
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-1
CHAPTER 1

URBAN WATER MANAGEMENT PLAN INTRODUCTION AND OVERVIEW

LAY DESCRIPTION - INTRODUCTION
An urban water supplier is defined (pursuant to Section 10617 of the California Water Code1) as “a supplier, either publicly or privately owned, providing water for municipal purposes either directly or indirectly to more than 3,000 customers or supplying more than 3,000 acre-feet of water annually. An urban water supplier includes a supplier or contractor for water, regardless of the basis of right, which distributes or sells for ultimate resale to customers.”
The City of Vernon (City) is classified as an urban water supplier because it supplies more than 3,000 acre-feet of water annually to its customers for municipal purposes.

In accordance with the “Urban Water Management Planning Act”, which was enacted by the California Legislature in 1983, every urban water supplier (including the City) is required to prepare and adopt an Urban Water Management Plan (UWMP), periodically review its UWMP, and incorporate updated and new information into an updated UWMP at least once every five years.

The City’s most recent update was its 2020 UWMP (or 2020 Plan) which was submitted to, and approved by, the California Department of Water Resources (DWR). Urban water suppliers (including the City) are required to complete and submit their 2025 UWMPs to DWR by July 1st, 2026.
1 References to CWC Sections in this 2025 UWMP were obtained from https://leginfo.legislature.ca.gov/ Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-2
The current requirements for preparing the UWMP are included in California Water Code (CWC) Sections 10608 through 10657. The City’s 2025 UWMP (or 2025 Plan) was prepared consistent with the CWC and the recommended organization provided in DWR’s Final “Urban Water Management Plan Guidebook 2025” (Final 2025 UWMP Guidebook), dated January 2026.

The UWMP provides urban water suppliers (including the City) with a reliable management action plan for long-term resource planning to ensure adequate water supplies are available to meet existing and future water supply needs. In addition, the 2025 Plan incorporates water supply reliability determinations resulting from potential prolonged drought, regulatory revisions, and/or changing climatic conditions.

The City’s 2025 Plan consists of the following Chapters:

Chapter 1 Urban Water Management Plan Introduction and Overview Chapter 2 Plan Preparation
Chapter 3 Service Area Description
Chapter 4 Water Use Characterization
Chapter 5 SB X7-7 Baselines, 2020 Targets, and 2025 Reporting Chapter 6 Normal-Year Water Supply Characterization
Chapter 7 Water Service Reliability and Drought Risk Assessment Chapter 8 Water Shortage Contingency Plan
Chapter 9 Demand Management Measures
Chapter 10 Plan Adoption, Submittal, and Implementation A lay description is presented at the beginning of each of these Chapters.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-3
LAY DESCRIPTION – CHAPTER 1

URBAN WATER MANAGEMENT PLAN INTRODUCTION AND OVERVIEW
Chapter 1 (Urban Water Management Plan Introduction and Overview) of the City’s 2025 Plan discusses and provides the following:
 An overall lay description of the 2025 Plan, including California Water Code and Urban Water Management Plan Act requirements, is provided. The City is required to prepare an Urban Water Management Plan.
 The City’s 2025 Plan was prepared consistent with the recommended organization provided in DWR’s Final “Urban Water Management Plan Guidebook 2025”, dated January 2026. A description regarding the organization of the 2025 Plan, including a summary of each Chapter, is provided. The City’s Water Shortage Contingency Plan (discussed in Chapter 8) is also included in the 2025 Plan.  The 2025 Plan incorporates DWR’s water use and supply tables (standardized Submittal Tables) for the reporting and submittal of UWMP data. Relevant Submittal Tables are included at the end of each Chapter in this 2025 Plan and in Appendix A.
 The City’s coordination efforts with other planning agencies are discussed, including coordination efforts with Central Basin Municipal Water District (CBMWD) and the Southern California Association of Governments  The City’s eligibility to receive grants and loans administered by the State of California and/or DWR, as a result of preparing the 2025 Plan, is discussed.  Information is provided which demonstrates the City’s prior, continued, and projected reduction on imported water supplies obtained (either directly or indirectly) from the Sacramento-San Joaquin Delta (Delta). The City has reduced Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-4
its reliance on imported water supplies for Calendar Year 2015, Calendar Year 2020, and Calendar Year 2025. In addition, the City is projected to continue reducing its reliance on imported water supplies through Calendar Year 2050.  The checklist developed by DWR and used by the City to incorporate the specific UWMP requirements is discussed. The completed checklist is provided in Appendix B.

UPDATED GUIDANCE FOR 2025 URBAN WATER MANAGEMENT PLAN
The City’s 2025 Plan was prepared consistent with the recommended organization provided in DWR’s Final “Urban Water Management Plan Guidebook 2025”, dated January 2026. DWR provided the following updated guidance for the preparation of the 2025 Plans (in comparison to the preparation of the 2020 Plans):
 There have been minor changes to the Water Code since the 2020 Plans were submitted; primarily, several definitions have been added (none of these change the requirements for 2025 Plans).
 DWR and the State Water Resources Control Board are using the same criteria to determine when a water supplier with multiple Public Water Systems is considered an Urban Water Supplier subject to UWMP requirements.  DWR has updated its submittal tables to reflect the current reporting year, improve accuracy of reporting, and more clearly identify information required by Water Code and optional information.
 There has been no change to the Water Code regarding water loss standard reporting since the 2020 Plans were submitted. However, water suppliers can report progress toward compliance with their 2028 Water Loss Standard in the 2025 Plans (see Table 4-6).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-5
 The State Water Resources Control Board has adopted regulations for the use of direct potable reuse (DPR) since the 2020 Plan reporting. To allow for reporting of DPR, minor changes have been made to the supply and demand tables in the 2025 Plans.
 While projections for lower-income housing were required in the 2020 Plans, additional guidance has been provided for optional reporting of the method used to project water use for lower-income housing.
 In previous years, the guidance for reporting water placed into storage did not differentiate between long-term storage (i.e., water placed into storage one year but extracted in a future year) and short-term storage (i.e., water that is placed into storage and extracted the same year). When a water supplier reports water placed into storage and then reports it was retrieved in the same year (short-term storage) it can cause a double counting error. Additional guidance has been provided recommending that water suppliers do not report water into and out of short-term storage.

SUBMITTAL TABLES

1.2.1 INCLUSION OF SUBMITTAL TABLES
CWC 10644.
(a)(2) The plan, or amendments to the plan, submitted to the department … shall include any standardized forms, tables, or displays specified by the department.

The City’s 2025 Plan includes the completion of DWR’s standardized Submittal Tables for the reporting and submittal of UWMP data. Relevant Submittal Tables are Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-6
included at the end of each Chapter in this 2025 Plan. In addition, all Submittal Tables are provided collectively in Appendix A.

1.2.2 OPTIONAL PLANNING TOOL
DWR has created an optional “Planning Tool Worksheet” for water suppliers to review and assess monthly water use trends. DWR has deemed the tool as optional and the City is not required by DWR to use the tool.

RECOMMENDED UWMP ORGANIZATION
The City’s 2025 Urban Water Management Plan (2025 Plan) was prepared consistent with the recommended organization provided in DWR’s Final “Urban Water Management Plan Guidebook 2025” (Final 2025 UWMP Guidebook), dated January 2026. The City’s 2025 Plan consists of the following Chapters:

Chapter 1 Urban Water Management Plan Introduction and Overview Chapter 2 Plan Preparation
Chapter 3 Service Area Description
Chapter 4 Water Use Characterization
Chapter 5 SB X7-7 Baselines, 2020 Targets, and 2025 Reporting Chapter 6 Normal-Year Water Supply Characterization
Chapter 7 Water Service Reliability and Drought Risk Assessment Chapter 8 Water Shortage Contingency Plan
Chapter 9 Demand Management Measures
Chapter 10 Plan Adoption, Submittal, and Implementation Pursuant to CWC requirements, the City’s 2025 Plan incorporates DWR’s water use and supply tables (standardized Submittal Tables) for the reporting and submittal of UWMP Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-7
data. DWR’s standardized Submittal Tables are provided within the body of the 2025 Plan text as well as in Appendix A.

The City’s 2025 Plan also provides supporting documents (appendices) including notification letters of the Plan update, public notice of the Plan hearing, and adoption resolution from the City’s governing body. Further discussions regarding these supporting documents are provided within the individual Chapters of the City’s 2025 Plan.

UWMPS IN RELATION TO OTHER EFFORTS
The City is a sub-agency of Central Basin Municipal Water District, a wholesale water agency. CBMWD prepared a 2025 Plan which is incorporated in the City’s 2025 Plan by reference. In addition, the City provided its 2025 Plan to CBMWD which includes water use projections in five-year increments for a normal year, a single dry year, and a five consecutive year drought over the next 25 years.

1.4.1 DEMONSTRATION OF CONSISTENCY WITH THE DELTA PLAN

FOR PARTICIPANTS IN COVERED ACTIONS

1.4.1.1 DEMONSTRATION OF CONSISTENCY WITH THE DELTA PLAN

FOR PARTICIPANTS IN COVERED ACTIONS
Pursuant to DWR, an urban water supplier that anticipates participating in or receiving water from a proposed project (or “covered action”) such as a multi-year water transfer, conveyance facility, or new diversion that involves transferring water through, exporting water from, or using water in the Sacramento-San Joaquin Delta (Delta) should provide information in their Plans for use in demonstrating consistency with Delta Plan Policy WR Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-8
P1, “Reduce Reliance on the Delta Through Improved Regional Water Self-Reliance”. In addition, pursuant to California Code of Regulations, Title 23, § 5003:
(c)(1) Water suppliers that have done all of the following are contributing to reduced reliance on the Delta and improved regional self-reliance and are therefore consistent with this policy:
(A) Completed a current Urban or Agricultural Water Management Plan (Plan) which has been reviewed by the California Department of Water Resources for compliance with the applicable requirements of Water Code Division 6, Parts 2.55, 2.6, and 2.8;
(B) Identified, evaluated, and commenced implementation, consistent with the implementation schedule set forth in the Plan, of all programs and projects included in the Plan that are locally cost effective and technically feasible which reduce reliance on the Delta; and
(C) Included in the Plan, commencing in 2015, the expected outcome for measurable reduction in Delta reliance and improvement in regional selfreliance. The expected outcome for measurable reduction in Delta reliance and improvement in regional self-reliance shall be reported in the Plan as the reduction in the amount of water used, or in the percentage of water used, from the Delta watershed. For the purposes of reporting, water efficiency is considered a new source of water supply, consistent with Water Code section 1011(a).

The City has reduced its reliance on the imported water supplies for Calendar Year (CY) 2015, CY 2020, and CY 2025. In addition, the City is projected to continue reducing its reliance on the imported water supplies through CY 2050. A further discussion which demonstrates the City’s measurable reduction in imported water reliance and improvement in regional self-reliance is provided in Appendix C.

1.4.1.2 PERMITTING FOR OCEAN DESALINATION PROJECTS
The City is currently not considering the development of a desalinated water project.

However, as discussed in Section 6.2.6, there may be opportunities for use of desalinated Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-9
ocean water as a potential water supply source in the future, if needed, through coordination with other agencies that have ocean desalination programs.

DEPARTMENT OF WATER RESOURCES’ REVIEW PROCESS
Section 10.5 discusses the process for a water supplier to submit the completed 2025 Plan to DWR, including electronic submittal through DWR’s online Water Use Efficiency Data (WUEdata) portal. DWR will subsequently review the 2025 Plans to ensure that they address the California Water Code requirements. Following DWR’s review, water suppliers will be notified of the results of the review via a formal review letter. These review letters will also be available to the public on DWR’s WUEdata portal. In cases where DWR finds that a Plan does not properly address item(s) in the Water Code, DWR will reach out to the water supplier to discuss needed corrections and correction procedures.

UWMPS AND GRANT OR LOAN ELIGIBILITY
CWC 10608.56.
(a) On and after July 1, 2016, an urban retail water supplier is not eligible for a water grant or loan awarded or administered by the state unless the supplier complies with this part. (c) Notwithstanding subdivision (a), the department shall determine that an urban retail water supplier is eligible for a water grant or loan even though the supplier has not met the per capita reductions required pursuant to Section 10608.24, if the urban retail water supplier has submitted to the department for approval a schedule, financing plan, and budget, to be included in the grant or loan agreement, for achieving the per capita reductions. The supplier may request grant or loan funds to achieve the per capita reductions to the extent the request is consistent with the eligibility requirements applicable to the water funds. (e) Notwithstanding subdivision (a), the department shall determine that an urban retail water supplier is eligible for a water grant or loan even though the supplier has not met the per capita reductions required pursuant to Section 10608.24, if the urban retail water supplier has Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-10
submitted to the department for approval documentation demonstrating that its entire service area qualifies as a disadvantaged community.
(f) The department shall not deny eligibility to an urban retail water supplier or agricultural water supplier in compliance with the requirements of this part and Part 2.8 (commencing with Section 10800), that is participating in a multiagency water project, or an integrated regional water management plan, developed pursuant to Section 75026 of the Public Resources Code, solely on the basis that one or more of the agencies participating in the project or plan is not implementing all of the requirements of this part or Part 2.8 (commencing with Section 10800).

CWC 10656.

An urban water supplier is not eligible for a water grant or loan awarded or administered by the state unless the urban water supplier complies with this part.

California Code of Regulations Title 23 Division 2 Chapter 5.1 Article 1, Section 596.1 (b)(2) “disadvantaged community” means a community with a median household income that is less than 80 percent of the statewide annual median household income.

Pursuant to DWR’s Final 2025 UWMP Guidebook:
“For a Supplier to be eligible for any water grant or loan administered by DWR, the Supplier must have a current UWMP on file that has been determined by DWR to address the requirements of the Water Code. A current UWMP must also be maintained by the Supplier throughout the term of any grant or loan administered by DWR. A UWMP may also be required to be eligible for other State funding, depending on the conditions that are specified in the funding guidelines. Suppliers are encouraged to seek guidance on the specifics of any State funding source from the respective funding agencies.”
The City’s 2025 UWMP has been prepared to meet eligibility requirements for grants and loans administered by the State and/or DWR.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 1-11

TIPS FOR UWMP PREPARERS
The City’s 2025 Plan (which includes the City’s 2025 Water Shortage Contingency Plan (WSCP)) is considered an update to the City’s 2020 UWMP. However, the 2025 Plan and the WSCP are considered stand-alone documents. As discussed in Section 1.3, the City’s 2025 Plan was prepared consistent with the recommended organization provided in DWR’s Final 2025 UWMP Guidebook. The City’s 2025 Plan was also prepared based on the tips provided in DWR’s Final 2025 UWMP Guidebook including the use of information from previous Plans and following the required Plan notification and adoption process.

In addition, a checklist of specific UWMP requirements is included in Appendix B. The checklist includes the page number where the required elements are addressed to assist in DWR’s review of the submitted Plan.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-1
CHAPTER 2

URBAN WATER MANAGEMENT PLAN PREPARATION
LAY DESCRIPTION – CHAPTER 2

PLAN PREPARATION
Chapter 2 (Plan Preparation) of the City’s 2025 Plan discusses and provides the following:
 The basis for preparing an Urban Water Management Plan is provided. The City is required to prepare the 2025 Plan because it is an “urban water supplier” (the City supplies more than 3,000 acre-feet of water annually to its customers for municipal purposes)
 The City is a “Public Water System” and is regulated by the State Water Resources Control Board - Division of Drinking Water. The City’s Public Water System number is provided in Table 2-1.
 The City’s Plan has been prepared as an “individual” plan rather than a “regional” plan in an effort to provide information specific to the City to best inform its employees, management and customers.
 Information presented in the City’s 2025 Plan is provided on “calendar year” basis which is from January 1 through December 31.
 Water quantities presented in the City’s 2025 Plan are provided on an “acre-foot” basis.
 The City’s coordination and outreach efforts with wholesale water agencies, other retail water agencies, and the community are described. The City coordinated the preparation of its 2025 Plan with the City of Vernon, the County of Los Angeles, Central Basin Municipal Water District, and the Water Replenishment District.  The City’s notification process to the cities and county within which the City provides water supplies to is discussed.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-2
As discussed in Section 1.3, the City’s 2025 Plan was prepared consistent with the recommended organization provided in DWR’s Final 2025 UWMP Guidebook.

Pursuant to CWC requirements, the City’s 2025 Plan incorporates DWR’s water use and supply tables (standardized Submittal Tables) for the reporting and submittal of UWMP data.

BASIS FOR PREPARING A PLAN
CWC 10617.
"Urban water supplier" means a supplier, either publicly or privately owned, providing water for municipal purposes either directly or indirectly to more than 3,000 customers or supplying more than 3,000 acre-feet of water annually. An urban water supplier includes a supplier or contractor for water, regardless of the basis of right, which distributes or sells for ultimate resale to customers.

This part applies only to water supplied from public water systems subject to Chapter 4 (commencing with Section 116275) of Part 12 of Division 104 of the Health and Safety Code.

CWC 10618.12.
(t) “Urban retail water supplier” means a water supplier, either publicly or privately owned, that directly provides potable municipal water to more than 3,000 end users or that supplies more than 3,000 acre-feet of potable water annually at retail for municipal purposes. (w) “Urban wholesale water supplier” means a water supplier, either publicly or privately owned, that provides more than 3,000 acre- feet of water annually at wholesale for potable municipal purposes.

CWC 10620.
(b) Every person that becomes an urban water supplier shall adopt an urban water management plan within one year after it has become an urban water supplier.

CWC 10621.
(a) Each urban water supplier shall update its plan at least once every five years on or before July 1, in years ending in six and one, incorporating updated and new information from the five years preceding each update.

The City’s 2025 Plan was prepared in accordance with the UWMP Act which was established in 1983. The UWMP Act requires every “urban water supplier” to prepare Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-3
and adopt a Plan, to periodically review its Plan at least once every five years and make any amendments or changes which are indicated by the review. An “Urban Water Supplier” is defined as a supplier, either publicly or privately owned, providing water for municipal purposes either directly or indirectly to more than 3,000 customers or supplying more than 3,000 acre-feet (AF) of water annually.

Section 10621(a) of the CWC states, “Each urban water supplier shall update its plan at least once every five years on or before July 1, in years ending in six and one, incorporating updated and new information from the five years preceding each update”.

As a result, DWR requires the 2025 Plans be submitted by July 1, 2026.

The City is an “urban water supplier” pursuant to Section 10617 of the CWC and supplies more than 3,000 acre-feet per year (AFY) of potable water at retail for municipal purposes.

The City’s 2025 Plan is an update to the City’s 2020 Plan.

2.1.1 SUPPLIERS WITH BOTH WHOLESALE AND RETAIL SALES
The City is a retail water supplier (and not a wholesale water supplier). The City’s 2025 Plan was prepared based on the CWC requirements pertaining to retail water suppliers.

The City relies on water supplies from wholesale water suppliers which are discussed in Section 2.4.1.

2.1.2 PUBLIC WATER SYSTEMS
California Health and Safety Code 116275.
(h) "Public water system" means a system for the provision of water for human consumption through pipes or other constructed conveyances that has 15 or more service connections or regularly serves at least 25 individuals daily at least 60 days out of the year.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-4
Pursuant to CWC requirements, the City’s 2025 Plan incorporates DWR’s standardized Submittal Tables for the reporting and submittal of UWMP data. The standardized Submittal Tables are provided within the body of the 2025 Plan text as well as in Appendix A. The City also submitted the UWMP data (from the Submittal Tables) electronically through DWR’s Online Submittal Tool.

In addition, the City is a Public Water System and is regulated by the State Water Resources Control Board - Division of Drinking Water (SWRCB-DDW). The SWRCBDDW requires water agencies provide the number of connections, water usage, and other information annually. The information provided to SWRCB-DDW indicates the City supplies more than 3,000 AFY. Table 2-1 provides the City’s Public Water System name and number. As indicated in Table 2-1, the City serves only a single Public Water System.

INDIVIDUAL OR REGIONAL PLANNING
The City has developed its 2025 Plan reporting solely on its service area to address all requirements of the California Water Code. The City’s 2025 Plan was not developed as a Regional Plan.

As shown in Table 2-2, the City’s 2025 Plan is an “Individual UWMP”. The City has developed its 2025 Plan reporting solely on its service area to address all requirements of the California Water Code, including water use targets and baselines pursuant to SB X7-7 Water Conservation Act of 2009 reporting (discussed further in Chapter 5). The City notified and coordinated with appropriate regional agencies and constituents (See Section 2.4).

2.2.1 REGIONAL REPORTING
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-5
CWC 10620.
(d)(1) An urban water supplier may satisfy the requirements of this part by participation in area wide, regional, watershed, or basin wide urban water management planning where those plans will reduce preparation costs and contribute to the achievement of conservation and efficient water use.

As indicated in Table 2-2, the City’s 2025 Plan was developed as an “Individual UWMP” and not part of a Regional Plan or a Regional Alliance.

FISCAL OR CALENDAR YEAR AND UNITS OF MEASURE
CWC 10608.20.
(a)(1) Urban retail water suppliers…may determine the targets on a fiscal or calendar year basis.

2.3.1 FISCAL OR CALENDAR YEAR
The data provided in the City’s 2025 Plan is reported on a calendar year basis, unless noted otherwise, as shown in Table 2-3. A calendar year begins on January 1st of every year.

2.3.2 UNITS OF MEASURE
As shown in Table 2-3, the data provided in the City’s 2025 Plan is reported in units of AF, unless noted otherwise.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-6

COORDINATION AND OUTREACH
CWC 10631.
(h) An urban water supplier that relies upon a wholesale agency for a source of water shall provide the wholesale agency with water use projections from that agency for that source of water in five-year increments to 20 years or as far as data is available. The wholesale agency shall provide information to the urban water supplier for inclusion in the urban water supplier’s plan that identifies and quantifies, to the extent practicable, the existing and planned sources of water as required by subdivision (b), available from the wholesale agency to the urban water supplier over the same five-year increments, and during various water-year types in accordance with subdivision (f). An urban water supplier may rely upon water supply information provided by the wholesale agency in fulfilling the plan informational requirements of subdivisions (b) and (f).

2.4.1 WHOLESALE AND RETAIL COORDINATION
The City is a sub-agency of the wholesale water agency CBMWD. As indicated in Table 2-4, the City has provided its 2025 Plan to CBMWD which includes water use projections in five-year increments for normal, single dry, and a five consecutive year drought conditions over the next 25 years.

2.4.2 COORDINATION WITH OTHER AGENCIES AND THE

COMMUNITY
CWC 10620.
(d)(3) Each urban water supplier shall coordinate the preparation of its plan with other appropriate agencies in the area, including other water suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable.

CWC 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…
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-7
The City is a retail water supplier that serves customers in the City of Vernon. The City is required to coordinate the preparation of the Plan with appropriate agencies in the area, including appropriate water suppliers that share a common source. Therefore, the City coordinated the preparation of its 2025 UWMP with Central Basin Municipal Water District. As discussed in Section 10.2, the City notified the cities and county within which the City provides water supplies, at least sixty (60) days prior to the public hearing of the preparation of the 2025 Plan and invited them to participate in the development of the 2025 Plan. A copy of the notification letters sent to these agencies is provided in Appendix D.

2.4.3 NOTICE TO CITIES AND COUNTIES
CWC 10621.
(b) Every urban water supplier required to prepare a plan pursuant to this part shall, at least 60 days before the public hearing on the plan required by Section 10642, notify any city or county within which the supplier provides water supplies that the urban water supplier will be reviewing the plan and considering amendments or changes to the plan.

As discussed in Section 10.2, notification was provided to the cities and county within which the City provides water supplies that the City was reviewing and considering amendments (updates) to the previous 2020 Plan, and as a result prepare the 2025 Plan.

The City provided notification to the City of Vernon and the County of Los Angeles.

Notification was provided at least 60 days prior to the public hearing (see Appendix D).

SUBMITTAL TABLES
The applicable standardized Submittal Tables referenced within Chapter 2 are provided below.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-8

2.5.1 SUBMITTAL TABLE 2-1: PWSs
Table 2-1 Public Water Systems

CA1910167 City of Vernon 1,215 4,879
1,215 4,879
Submittal Table 2-1 Retail: Public Water Systems
Add additional rows as needed
NOTES:

Volume of Water
Supplied 2025 (AF)
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
Public Water System
Number
Public Water System
Name
Number of Municipal
Connections 2025
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-9

2.5.2 SUBMITTAL TABLE 2-2: PLAN TYPE IDENTIFICATION
Table 2-2 Plan Identification Type

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-10

2.5.3 SUBMITTAL TABLE 2-3: SUPPLIER INFORMATION
Table 2-3 Supplier Information

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 2-11

2.5.4 SUBMITTAL TABLE 2-4: WATER SUPPLIER INFORMATION

EXCHANGE
Table 2-4 Water Supplier Information Exchange
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
Central Basin Municipal Water District
NOTES:

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-1
CHAPTER 3

SERVICE AREA DESCRIPTION
LAY DESCRIPTION – CHAPTER 3

SERVICE AREA DESCRIPTION
Chapter 3 (Service Area Description) of the City’s 2025 Plan discusses and provides the following:
 A description of the City’s service area is provided. The City’s water service area is approximately 4.2 square miles in size. The City is bounded by the Cities of Bell, Commerce, Huntington Park, Los Angeles, and Maywood and unincorporated areas of Los Angeles County.
 The location of the City’s water service area is provided in Figure 1.  A description regarding the City’s water service area climate is provided. The monthly historical average temperatures (including minimum and maximum), monthly historical average rainfall, and monthly evapotranspiration (ETo) in the vicinity of the City’s service area is summarized. The sources of the climate information are also discussed.
 The population within the City’s water service area is discussed and projected. The sources of the population information are also discussed. The City provides water service to an area with a current population of about 200. The City is projected to have a population of about 5,232 by CY 2050. Currently, the City’s service area is comprised predominately of commercial and industrial land uses.  A discussion of land use information used by the City to develop the 2025 Plan is provided. The City reviewed the current and projected land uses within its service area. The City also reviewed data provided by the Southern California Association of Governments, the Department of Finance, and the United States Census Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-2
Bureau and prepared for counties, cities, and unincorporated areas within Southern California.

GENERAL DESCRIPTION
CWC 10631.
(a) Describe the service area of the supplier, including current and projected population, climate, and other social, economic, and demographic factors affecting the supplier’s water management planning. The projected population estimates shall be based upon data from the state, regional, or local service agency population projections within the service area of the urban water supplier and shall be in five-year increments to 20 years or as far as data is available. The description shall include the current and projected land uses within the existing or anticipated service area affecting the supplier’s water management planning. Urban water suppliers shall coordinate with local or regional land use authorities to determine the most appropriate land use information, including, where appropriate, land use information obtained from local or regional land use authorities, as developed pursuant to Article 5 (commencing with Section 65300) of Chapter 3 of Division 1 of Title 7 of the Government Code.

The City of Vernon is located in the urbanized area of southern Los Angeles County, a few miles south of downtown Los Angeles. The City’s water service area is approximately

4.2 square miles in size. The City is bounded by the Cities of Bell, Commerce, Huntington Park, Los Angeles, and Maywood and unincorporated areas of Los Angeles County.

City founders recognized the significance of the three major railroads running through the area. The founders convinced railroad executives to run spur tracks off the main lines and later incorporated the adjacent three miles as an "exclusively industrial" city named after a dirt road, Vernon Avenue, crossing its center.

The City provides water service to most of the area within the City of Vernon’s municipal boundaries, however California Water Service Company (East Los Angeles District, Commerce System) serves some of the northeast portion of the City, and a small Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-3
portion of southeast Vernon is serviced by the Maywood Mutual Water Company Number

3. The service areas of the three water suppliers serving within the City of Vernon’s municipal boundaries are shown in the figure below.

The City currently produces potable water supply from seven (7) groundwater wells that produce water from the Central Basin (including Wells 11, 15, 16, 19, 20, 21, and 22).

The total capacity of the City’s groundwater wells is approximately 9,200 gallons per minute (gpm). A discussion of the City’s sources of water supply is provided in Chapter

6. SERVICE AREA BOUNDARY MAPS
As discussed in Section 3.1, the City’s service area covers approximately 4.2 square miles encompassing the majority of the City of Vernon. A service area boundary map is Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-4
provided on Figure 1. The City’s water service area boundary relative to the City of Vernon’s municipal boundary is also provided in Figure 2.

The City’s service area boundary was originally created in a Geographical Information Systems (GIS) shape file format and converted into a KML format. To the extent information was available, metadata was included in the KML file (including map projection, contact information, start and end dates for which the map is valid, constraints, attribute table definitions, and digitizing base).

SERVICE AREA CLIMATE
CWC 10631.
(a) Describe the service area of the supplier, including … “climate…” CWC 10630.

It is the intention of the Legislature, in enacting this part, to permit levels of water management planning commensurate with the numbers of customers served and the volume of water supplied, while accounting for impacts from climate change.

The monthly historical average temperatures (including minimum and maximum), monthly historical average rainfall, and monthly ETo in the vicinity of the City’s service area is summarized in the tabulation below. Historical climate information was obtained from the Western Regional Climate Center (WRCC), Los Angeles County Department of Public Works (DPW), and from DWR’s California Irrigation Management Information System (CIMIS).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-5
Service Area Climate Information

Month
Average
Temperature
Average
Minimum
Temperature
Average
Maximum
Temperature
Average Total
Precipitation ETo
(F) (F) (F) (Inches) (Inches)

January 58.6 47.8 69.6 3.2 2.1
February 60.2 48.8 71.4 3.2 2.7
March 61.6 50.4 72.9 2.2 3.9
April 65.5 53.3 77.6 1.0 4.8
May 68.3 57.3 79.4 0.2 5.1
June 72.5 60.9 84.0 0.1 5.5
July 76.5 64.2 88.6 0.0 6.3
August 77.2 65.1 89.5 0.1 6.1
September 75.6 63.6 87.7 0.3 4.7
October 70.6 58.5 82.9 0.5 3.6
November 63.4 51.5 75.4 1.4 2.3
December 59.0 47.4 70.5 2.0 1.7

Annual 67.0 55.3 79.1 14.5 48.8

Source: Historical average monthly precipitation information was obtained from the Western Regional Climate Center (http://www.wrcc.dri.edu/) and is based on data collected from Station 049660 (Whittier City Yard, California) from 1949 through 2014. Historical average monthly temperature information was obtained from the Western Regional Climate Center (http://www.wrcc.dri.edu/) and is based on data collected from Station 045790 (Montebello, California) from 1979 through 2011.

Historical monthly average ETo information was obtained from the California Irrigation Management Information Systems (http://wwwcimis.water.ca.gov) and is based on the weighted average of data collected from Station 174 (Long Beach) and Station 223 (North Hollywood).

The historical average rainfall in the vicinity of the City’s service area is 14.5 inches. The City’s service area has a dry climate and summers can reach average maximum daily temperatures in the high 80s. Although changes in climatic conditions may have an impact (as discussed in Section 4.5), the projected water supply demands will be based on average year, single dry year and a five consecutive year drought, based on historical data and projected demands. Precipitation within the vicinity of the City’s service area is discussed further in Section 7.2.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-6
A discussion of the City’s sources of supply, how those sources may be impacted by climate change, and the proactive actions the City and other local/regional water managers may take to address the potential climate change on water supplies is provided in Section 4.2.5.6.

SERVICE AREA POPULATION AND DEMOGRAPHICS

3.4.1 SERVICE AREA POPULATION
CWC 10631.
(a) Describe the service area of the supplier, including current and projected population… The projected population estimates shall be based upon data from the state, regional, or local service agency population projections within the service area of the urban water supplier and shall be in five-year increments to 20 years or as far as data is available.

The City provides water service to an area with a current population of about 200. Table 3-1 presents the current and projected population of the area encompassed by the City’s service area from CY 2025 to CY 2050. The City is projected to have a population of about 5,232 by CY 2050. Currently, the City’s service area is comprised predominately of commercial and industrial land uses. However, the City anticipates an additional 2,000 residential units will be added within the next five years.

A GIS analysis using census tracts was performed to estimate the current population (CY 2025) within the City’s service area. The City’s service area is comprised of individual census tracts which represent smaller statistical areas for which population data is available. The smaller census tracts were combined to more accurately represent the total area within the City’s service area.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-7
Current census tract information was obtained in a GIS format from the advanced demographics dataset developed by Esri which includes source material supplied by the U.S. Census Bureau and the U.S. Census Bureau's American Community Survey.

The City’s service area boundary in a GIS format was overlayed on the census tract GIS layer. Each census tract located within the City’s service area was identified (including the entire census tract or a portion of). For a census tract located entirely within the service area, the entire population (i.e. 100 percent) associated with the census tract was incorporated. For a census tract located partially within the service area, the portion (or percentage) of the census tract located geographically within the service area was determined through GIS. The percentage was then applied to the census tract’s population in order to estimate the population of the census tract within the service area.

The total population within the City’s service area was then estimated based on the sum of the populations within these census tracts.

The City anticipates rapid population expansion within its service area over the next several years. The City anticipates an additional 500 residential units will be built over the next two to three years, with an additional 2,000 residential units total built over the next five years. The projected total population within the City’s service area was also based on growth rate projections included in the Southern California Association of Governments (SCAG) “Connect SoCal 2024, Demographics and Growth Forecast” report dated April 2024. The SCAG report incorporates demographic trends, existing land use, general plan land use policies, and input and projections through the year 2050 from the Department of Finance (DOF) and the U.S. Census Bureau for counties, cities and unincorporated areas within Southern California. Annual growth rate projections within the City’s service area were estimated based on the SCAG report and applied to the City’s current population to estimate projected populations through 2050.

Moving forward, the City of Vernon will continue planning for the Regional Housing Needs Assessment (RHNA) allocations and future planned developments including the addition Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-8
of apartment units and accessory dwelling units (ADUs) as the means of affordable housing.

Pursuant to the California State Housing Law, every jurisdiction (including the City of Vernon) is required to plan for its RHNA allocation in the Housing Element of its General Plan. RHNA is a representation of future housing needs for all income levels in a jurisdiction. SCAG’s “6th Cycle Final RHNA Allocation” was adopted March 2021 (and modified in July 2021) and covers the planning period from October 2021 through October 2029. The total RHNA allocation of housing within the City of Vernon through 2029 is nine (9 )units including five (5) “very-low” income units and four (4) “low” income units (with no “moderate” and “above moderate” income units). The City of Vernon must identify adequate sites and establish policies and programs that will accommodate the estimated growth, however the City of Vernon is not obligated to produce, construct, or develop these allocated units.

3.4.2 OTHER SOCIAL, ECONOMIC, AND DEMOGRAPHIC FACTORS
CWC 10631.
(a) Describe the service area of the supplier, including… other social, economic, and demographic factors affecting the supplier’s water management planning.

No other demographic factors affect the City’s water management planning. However, increased population will have an impact on water demand.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-9

LAND USES WITHIN SERVICE AREA
CWC 10631.
(a) ...The description shall include the current and projected land uses within the existing or anticipated service area affecting the supplier’s water management planning. Urban water suppliers shall coordinate with local or regional land use authorities to determine the most appropriate land use information, including, where appropriate, land use information obtained from local or regional land use authorities…
The City reviewed the current and projected land uses within its service area during the preparation of this 2025 Plan. Information regarding current and projected land uses is included in the Vernon General Plan updated in 2015. The existing land uses within the City’s service area include residential (single and multi-family), commercial, and industrial. The projected land uses within the City’s service area are expected to remain similar to the existing land uses. In addition, although mostly built-out, the projected population within the City’s service area is anticipated to increase (as discussed in Section 3.4). A discussion of the existing and projected water uses for the individual water use sectors within the City’s service area, which includes the different land uses, is provided in Section 4.2. As discussed in Section 2.4, the City coordinated the preparation of the 2025 Plan with the City of Vernon, the County of Los Angeles, and other agencies.

As discussed in Section 3.4, the City obtained data from the Southern California Association of Governments document entitled “Connect SoCal 2024, Demographics and Growth Forecast”, dated April 2024.Projected populations in the City’s service area were based on growth rate projections developed by SCAG. The data provided by SCAG incorporates demographic trends, existing land use, general plan land use policies, and input and projections through the year 2050 from the Department of Finance and the U.S.

Census Bureau for counties, cities and unincorporated areas within Southern California.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 3-10

SUBMITTAL TABLES
The applicable standardized Submittal Table referenced within Chapter 3 is provided below.

3.6.1 SUBMITTAL TABLE 3-1: POPULATION - CURRENT AND PROJECTED Table 3-1 Population - Current and Projected
2025 2030 2035 2040 2045 2050(opt)
200 1,451 5,208 5,216 5,224 5,232
Submittal Table 3-1 Retail: Population - Current and Projected Water Code Section 10631(a)
Population
Served
NOTES:

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-1
CHAPTER 4

WATER USE CHARACTERIZATION
LAY DESCRIPTION – CHAPTER 4

WATER USE CHARACTERIZATION
Chapter 4 (Water Use Characterization) of the City’s 2025 Plan discusses and provides the following:
 The City provides water service to individual “water use sectors”. These water use sectors include single and multi-family residential, commercial, and industrial.

Individual descriptions for these water use sectors are provided in Section 4.2.1.  The City’s total water demands (including potable and recycled water) over the past 15 years have ranged from 4,879 AFY to 8,756 AFY, with an average of 7,345 AFY. The City currently measures its water use through meter data and billing records.
 The City conducts an annual water loss audit to identify distribution system water losses. Water losses can result from pipeline leaks and inaccurate metering due to faulty meters. Water loss estimates are incorporated into the City’s projected water demands.
 The City’s current and projected water demands are provided in five-year increments over the next 25 years are provided (through Calendar Year 2050) as shown on Table 4-3.
 The City’s water demand projections incorporate passive savings from water savings which are the result of implementation of codes, water conservation standards, and/or ordinances.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-2
 The projected water demands for lower income households are identified and are included in the City’s total projected water demands
 The City’s sources of water supply and how those sources may be impacted by climate change are discussed. The proactive actions the City and other local/regional water managers may take to address the potential climate change impacts on water supplies are also discussed.

NON-POTABLE VERSUS POTABLE WATER USE
The Water Code requires a description and quantification of water uses within the City’s service area, including both non-potable and potable water. Recycled water (non-potable) uses are addressed in Section 6.2.5; however, a summary is provided in Table 4-1 and 4-2. Furthermore, Chapter 4 addresses the City’s potable water demands.

PAST, CURRENT, AND PROJECTED WATER USE BY SECTOR
CWC 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.

CWC 10631.
(d)(1) For an urban retail water supplier, quantify, to the extent records are available, past and current water use, over the same five-year increments described in subdivision (a), and projected water use, based upon information developed pursuant to subdivision (a), identifying the uses among water use sectors, including, but not necessarily limited to, all of the following…
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-3
(2) The water use projections shall be in the same five-year increments described in subdivision (a).
(4)(A) Water use projections, where available, shall display and account for the water savings estimated to result from adopted codes, standards, ordinances, or transportation and land use plans identified by the urban water supplier, as applicable to the service area. (4)(B) To the extent that an urban water supplier reports the information described in subparagraph (A), an urban water supplier shall do both of the following:
(i) Provide citations of the various codes, standards, ordinances, or transportation and land use plans utilized in making the projections.
(ii) 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.

The City’s current and projected water demands are provided in five-year increments over the next 25 years (CY 2050) in Tables 4-1 and 4-2. The City’s total water demands were projected based on a review of the “2020 Water Use Target” pursuant to SB X7-7 calculations (discussed in Section 5.2), current water use factors based on recent water demands, Urban Water Use Objective standards (discussed in Section 5.2.6), and the total population projections based on land use trends within the City (discussed in Section

3.4).

The City provides water service to individual “water use sectors” as identified by the California Water Code. The water use sectors supplied by the City are discussed in Section 4.2.1. The water use for each of these sectors during CY 2025 is provided in Table 4-1. The projected water use for each individual water use sector through CY 2050 is provided in Table 4-2 and is based on the percentage breakdown of water use from each individual water use sector in CY 2025 (the percentages were then applied to the projected total water use).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-4

4.2.1 WATER-USE SECTORS LISTED IN WATER CODE
CWC 10631.
(d)(1) For an urban retail water supplier, quantify, to the extent records are available, past and current water use, over the same five-year increments described in subdivision (a), and projected water use, based upon information developed pursuant to subdivision (a), identifying the uses among water use sectors, including, but not necessarily limited to, all of the following:
(A) Single-family residential.
(B) Multifamily.
(C) Commercial.
(D) Industrial.
(E) Institutional and governmental.
(F) Landscape.
(G) Sales to other agencies.
(H) Saline water intrusion barriers, groundwater recharge, or conjunctive use, or any combination thereof.
(I) Agricultural.
(J) Distribution system water loss.

As shown in Table 4-1, the City’s service area includes the following water use sectors listed in the California Water Code:
 Single-family residential
(A single-family dwelling unit is a lot with a free-standing building containing one dwelling unit that may include a detached secondary dwelling. Single-family residential water demands are included in retail demands.)  Multi-family
(Multiple dwelling units are contained within one building or several buildings within one complex. Multi-family residential water demands are included in retail demands.)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-5
 Commercial
(Commercial users are defined as water users that provide or distribute a product or service)
 Industrial
(Industrial users are defined as water users that are primarily a manufacturer or processor of materials as defined by the North American Industry Classification System (NAICS) code sectors 31 to 33, inclusive, or an entity that is a water user primarily engaged in research and development. Industrial water demands are included in retail demands.)
 Distribution system losses
(Distribution system losses represent the potable water losses from the pressurized water distribution system and water storage facilities, up to the point of delivery to the customers. Additional information is discussed in Section 4.2.4)

4.2.2 OPTIONAL WATER-USE SECTORS IN ADDITION TO THOSE

LISTED IN WATER CODE
The City’s service area does not include other water demand sectors which are not listed in the California Water Code (including exchanges, transfers, wetlands or wildlife habitat, and surface water storage).

4.2.3 PAST WATER USE
Chapter 6 provides a discussion of the sources of water supply the City uses to meet its water demands. Section 6.1 provides a tabulation of the City’s historical annual water demands for each water supply source. Over the past 15 years, the City’s total water demands (including potable and recycled water) have ranged 4,879 AFY to 8,756 AFY, Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-6
with an average of 7,345 AFY. In addition, the City previously experienced a five consecutive year drought within its service area from CY 2011 to CY 2015. The City reviewed its historical water demands to determine the projected water demands and water supply reliability (discussed in Chapter 7). The City is able to provide sufficient water supplies to meet the projected water demands of its customers, including during a five consecutive year drought period.

4.2.4 CURRENT WATER USE
CWC 10631.
(d)(1) For an urban retail water supplier, quantify, to the extent records are available, past… water use… based upon information developed pursuant to subdivision (a), identifying the uses among water use sectors…
The City currently measures its water use through meter data and billing records. The water use for the City’s individual water use sectors during CY 2025 are provided in Table 4-1. Recycled water uses are addressed separately in Section 6.5; however, a summary of projected recycled water uses is provided in Table 4-2.

DWR has created an optional “Planning Tool Worksheet” for water suppliers to review and assess monthly water use trends. DWR has deemed the tool as optional and the City is not required by DWR to use the tool. Section 6.1 provides a tabulation of the City’s historical annual water uses for each water supply source. During the past 15 years, the City experienced a five consecutive year drought within its service area from CY 2011 to CY 2015. Historical records indicate the City’s annual water demands had been greater prior to CY 2011. The City has been able to provide sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands. In addition, the City has been able to provide water service to meet maximum day water demands for these years, including during the summer months. A further Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-7
discussion regarding the reliability of the City’s water supply sources is provided in Chapter 7.

4.2.5 PROJECTED WATER USE

4.2.5.1 GENERAL GUIDANCE ON PROJECTIONS
CWC 10631.
(d)(1) For an urban retail water supplier, quantify, to the extent records are available, … projected water use, based upon information developed pursuant to subdivision (a), identifying the uses among water use sectors…
CWC 10633.

The plan shall provide, to the extent available, information on recycled water...and shall include all of the following:...
(e) The projected use of recycled water within the supplier’s service area at the end of 5, 10, 15, and 20 years, and a description of the actual use of recycled water in comparison to uses previously projected pursuant to this subdivision...

CWC 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.

CWC 10631.
(h) An urban water supplier that relies upon a wholesale agency for a source of water shall provide the wholesale agency with water use projections from that agency for that source of water in five-year increments to 20 years or as far as data is available… As discussed above, the City’s current and projected water demands are provided in fiveyear increments over the next 25 years (through CY 2050) in Tables 4-1 and 4-2. The Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-8
City’s total water demands were projected based on a review of the “2020 Water Use Target” pursuant to SB X7-7 calculations (discussed in Section 5.2), current water use factors based on recent water demands, Urban Water Use Objective state standards (discussed in Section 5.2.6), and the total population projections based on land use trends within the City (discussed in Section 3.4). Chapter 6 provides a discussion of the sources of water supply the City will use to meet the projected water demands (including recycled water use). The City’s projected water demands and water supplies during a normal year, a single dry year, and a five consecutive year drought are provided in Chapter 7.

Because the City relies on wholesale water supplies, the City has provided its 2025 Plan to CBMWD as discussed in Section 2.4.1.

4.2.5.2 WATER-USE PROJECTIONS BY SECTOR
CWC 10631.
(d)(1) For an urban retail water supplier, quantify, to the extent records are available … projected water use based upon information developed pursuant to subdivision (a), The City provides water service to individual “water use sectors” as identified by the California Water Code. The water use sectors supplied by the City are discussed in Section 4.2.1. The water use for each of these sectors during CY 2025 is provided in Table 4-1. The projected water use for each individual water use sector through CY 2050 is provided in Table 4-2 and is based on the percentage breakdown of water use from each individual water use sector in CY 2025 (the percentages were then applied to the projected total water use).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-9

4.2.5.3 STANDARDS, CODES, ORDINANCES, AND PLANS
CWC 10631.
(d)(4)(A) Water use projections, where available, shall display and account for the water savings estimated to result from adopted codes, standards, ordinances, or transportation and land use plans identified by the urban water supplier, as applicable to the service area. (d)(4)(B) To the extent that an urban water supplier reports the information described in subparagraph (A), an urban water supplier shall do both of the following:
(i) Provide citations of the various codes, standards, ordinances, or transportation and land use plans utilized in making the projections.
(ii) 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.

The City’s projected water demands are provided in five-year increments over the next 25 years (through CY 2050) in Table 4-2. The City’s projected water demands and water supplies during a normal year, a single dry year, and a five consecutive year drought are provided in Chapter 7. The projected water demands for each of the City’s water use sectors are provided in Table 4-2. As discussed in the following Section, the City’s water demand projections incorporate “passive savings” which are the result of implementation of codes, standards, and/or ordinances.

4.2.5.4 RETAIL ONLY
The City’s total water demands were projected based on a review of the “2020 Water Use Target” pursuant to SB X7-7 calculations (discussed in Section 5.2), current water use factors based on recent water demands, Urban Water Use Objective standards (discussed in Section 5.2.6), and the total population projections based on land use trends within the City (discussed in Section 3.4). The projected water demands for the water use sectors were based on the percentage breakdown of water demands from each individual Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-10
water use sector in CY 2025 (the percentages were then applied to the projected total water demands). A discussion of the City’s water supplies from CBMWD, a wholesaler, are discussed in Section 6.2. As discussed in Section 2.4.1, the City has coordinated its water demand projections with CBMWD for each water use sector.

The City’s water demand projections incorporate water savings from “passive savings” which are the result of implementation of codes, standards, and/or ordinances. The City adopted Resolution 2014-51 in August 2014 and Resolution 2015-34 in in June 2015 which declared a water supply shortage and provided methods reduction in water use and water waste. Prior to adoption of these Resolutions (provided in Appendix E), the City’s water use rate ranged from approximately 89,630 gallons per capita day to 109,197 gallons per capita day (from CY 2000 to CY 2008). As identified in Section 5.2.2, the City’s actual water use rate during CY 2020 was 59,814 gallons per capita per day which is a decrease of up to 49,383 gallons per capita per day from the recent historical water use and includes passive savings. The City’s projected water demands, incorporate water use targets less than its established SB X7-7 water use target for 2020 and incorporate ongoing water passive savings and reduced water use. As indicated in Table 4-3, estimated future water savings have been considered as part of the City’s water use projections.

4.2.5.5 LOWER-INCOME HOUSEHOLDS
CWC 10631.1.
(a) The water use projections required by Section 10631 shall include projected water use for single-family and multifamily residential housing needed for lower income households, as defined in Section 50079.5 of the Health and Safety Code, as identified in the housing element of any city, county, or city and county in the service area of the supplier. (b) It is the intent of the Legislature that the identification of projected water use for single-family and multifamily residential housing for lower income households will assist a supplier in complying with the requirement under Section 65589.7 of the Government Code to grant a priority for the provision of service to housing units affordable to lower income households.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-11
California Health and Safety Code 50079.5.
(a) "Lower income households" means persons and families whose income does not exceed the qualifying limits for lower income families… In the event the federal standards are discontinued, the department shall, by regulation, establish income limits for lower income households for all geographic areas of the state at 80 percent of area median income, adjusted for family size and revised annually.

The City’s water demands projections provided in Table 4-2 include projected water demands for lower income single-family and multi-family households. A lower income household is defined as a household with an income less than 80 percent of the "area median income”, adjusted for family size. For the purpose of this evaluation, the entire Los Angeles County was used for the “area median income”. The total number of lower income households within the City’s service area was estimated based on billing records provided by the City, a review of the Vernon General Plan, a review of median household income range statistics provided by the US Census Bureau (https://data.census.gov/cedsci/), and a review of GIS maps of Disadvantaged Communities2 (DACs), including block groups, tracts, and places, provided by DWR. The estimated number of lower income households located within the City’s service area is 57.1 percent of the total number of households. As indicated in Table 4-2, the total projected residential (single and multifamily) water demands within the City in CY 2050 is estimated at about 479 AFY. Based on a 57.1 percent use factor of total residential (single and multi-family) water demands, the projected water demand for lower income households will be about 274 AFY by the CY 2050. The projected water demands for lower income households were included in the City’s total projected water demands, as indicated in Table 4-3. 2 GIS information for DACs is based on data from the US Census showing census block groups, tracts, and places identified as disadvantaged communities (less than 80 percent of the State's median household income) or severely disadvantaged communities (less than 60 percent of the State's median household income)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-12

4.2.5.6 CLIMATE CHANGE CONSIDERATIONS
CWC 10630.

It is the intention of the Legislature, in enacting this part, to permit levels of water management planning commensurate with the numbers of customers served and the volume of water supplied, while accounting for impacts from climate change.

CWC 10635.
(b) Every urban water supplier shall include, as part of its urban water management plan, a drought risk assessment… (and) shall include each of the following… (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.

Climate is defined as “the average course or condition of the weather at a place usually over a period of years as exhibited by temperature, wind velocity and precipitation3”. A change in the climate which produces a greater amount of precipitation (i.e. more runoff and/or snowpack) and lower temperatures is generally a benefit to water supplies.

However, drought conditions which may result in decreased precipitation, decreased runoff, and increased temperature may adversely affect an urban water supplier’s ability to meet demands by potentially impacting supplies. Consequently, the focus of impacts of climate change is on these adverse consequences.

Section 6.2 of this Plan describes the City’s sources of water supply, management practices associated with those sources, and the long-term reliability of those sources.

Section 7.3 includes a Drought Risk Assessment which considers the potential impacts of climate change to the City’s water supply sources. Chapter 8 provides a detailed discussion of the City’s Water Shortage Contingency Plan, including but not limited to, the six standard water shortage levels in the event climate change results in a reduction 3 www.merriam-webster.com
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-13
to water supplies associated with a periodic drought condition. The following is a discussion of the City’s sources of supply, how those sources may be impacted by climate change, and the proactive actions the City and other local/regional water managers may take to address the potential climate change impacts on water supplies.

Imported Water Supplies
The City receives treated imported water as discussed in Section 6.2.1 and relies on the Water Replenishment District of Southern California (WRD) to manage groundwater supplies of the Central Basin. Consequently, the City directly and/or indirectly relies on the Metropolitan Water District of Southern California for those imported water supplies.

MWD has prepared a Regional 2025 Urban Water Management Plan which includes a discussion (Section 2.4.1 in MWD’s 2025 UWMP) of the reliability of its water supplies and the impacts of climate change and is incorporated by reference in this Plan.

Furthermore, the City is a sub-agency of the Central Basin Municipal Water District which has also provided a discussion of climate change considerations and that discussion is included by reference. The following is a brief summary of MWD’s efforts:

Resource Planning
 MWD has established the Robust Decision Making (RDM) approach to identify vulnerabilities to its water supplies. Climate change information was applied to MWD’s simulated water supply scenarios to demonstrate the vulnerability of water supplies to climate change.
 MWD altered the inflow hydrology scenarios on the Colorado River simulation model to reflect modified inflow to MWD’s Colorado River aqueduct.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-14
Knowledge Sharing and Research Support
 MWD is an active and founding member of the Water Utility Climate Alliance (WUCA) which includes 12 nationwide partners collaborating on climate change considerations. As such, MWD shares agency actions on climate change and adaptation. WUCA has also released numerous research papers on climate change.

Implementation of Programs and Policies
 MWD’s programs include the use of solar energy, use of ride share programs, and reduction of greenhouse emissions. Collectively these actions are intended to impact the effects of climate change.

Groundwater Supplies – Central Basin
The City relies on groundwater produced from the Central Basin as noted in Section 6.2.2 of this UWMP. The Central Basin has been identified by DWR as a very low-priority groundwater basin partially due to the fact it is adjudicated. In that regard, the Central Basin is actively managed by the Water Replenishment District of Southern California which serves as the Central Basin Watermaster and those management activities are described in detail in Section 6.2.2.

Recognizing the potential impacts of climate change on the Central Basin groundwater supplies (decreased local runoff and replenishment, along with increased groundwater production, may lead to decreased groundwater levels), the City has used climate tools available on the California Energy Commission’s Cal-Adapt website (https://cal-adapt.org/) \to identify potential future climate change cycles for the Central Basin. The Cal-Adapt website has been developed by the Geospatial Innovation Facility at the University of Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-15
California, Berkeley with funding and advisory oversight by the California Energy Commission and California Strategic Growth Council.

To address the uncertainty in future greenhouse gas emissions, Cal-Adapt has developed a Representative Concentration Pathway 4.5 (RCP 4.5) scenario and a Representative Concentration Pathway 8.5 (RCP 8.5) scenario. RCP 4.5 represents a scenario in which greenhouse gas emissions peak around 2040, then decline and stabilize. RCP 8.5 represents a scenario in which emissions continue to strongly rise through 2050 and plateau around 2100. RCP 4.5 is a “medium” emissions scenario that models a future in which there is an effort made by societies to reduce greenhouse gas emissions, whereas RCP 8.5 is a “business-as-usual” scenario. For the City’s climate change analysis, the RCP 4.5 scenario was selected.

The Cal-Adapt climate tools also incorporate several General Circulation Models (GCMs), which represent physical processes in the atmosphere, ocean, and land surface. These GCMs projected future climates under conditions such as warm/dry, cooler/wetter, and average simulations. For the City’s climate change analysis, the average condition GCM (CanESM2) was selected.

The climate tools available on the Cal-Adapt website were used to simulate projected annual precipitation and annual average maximum temperature in the Central Basin. An electronic boundary of the Central Basin was submitted online through the Cal-Adapt website in a “KML” file format (i.e. Google Earth format) and data using several of the available climate tools was generated.

Based on the data generated by the Cal-Adapt simulations (see Appendix F), the average annual rainfall in the Central Basin is projected to be 16.5 inches through 2099, compared to historical average of 15.1 inches (from 1961 through 1990). In addition, the average maximum temperature is projected to be 80.3 degrees Fahrenheit compared to a historical average of 74.7 degrees Fahrenheit. Although there may be more precipitation Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-16
in the future, it may be more likely to fall as rainfall compared to snowfall. The simulations do not denote the duration or intensity of storms contributing to the annual precipitation.

Notwithstanding, the San Gabriel River watershed includes a complex and interconnected series of dams, reservoirs and replenishment basins to capture stormwater runoff. In an average to below average year of precipitation, over 95 percent of the precipitation in the watershed is retained within the watershed and is not lost to the ocean. Consequently, most if not all precipitation (whether it is rain or snowfall) likely will be captured for use in the Central Basin area and not adversely impacted by a potentially higher average annual temperature.

Recognizing these potential impacts to local hydrology resulting from climate change and the resultant impacts to the groundwater supplies, WRD has taken (and may reinstate as needed) the following proactive actions to anticipate and circumvent the potential impacts of climate change. These actions will enable the City to use rely on the Central Basin as a reliable source of supply.

Recycled Water Groundwater Replenishment
The WRD has actively used recycled water for groundwater replenishment for many decades. Historically the recycled water replenishment was supplemented with untreated imported water replenishment as part of Central Basin management. However, WRD has also established the Water Independence Now (WIN) program. The WIN program includes a treatment facility (previously referred to as the Groundwater Reliability Improvement Program) which includes ultrafiltration, reverse osmosis, and ultraviolet disinfection and advanced oxidation to treat recycled water by significantly reducing the total dissolved solids concentration. This action with gradually help to improve the water quality of the Central Basin, plus reduce or eliminate the future need to purchase untreated imported water.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-17
Water Storage Programs
The Central Basin Adjudication allows Parties to the Judgment to pump up to 20 percent more of its annual Allowed Pumping Allocation plus any carry-over water rights as described in Section 6.2.2. In addition, the Central Basin Judgment includes an amendment which implemented a water storage program. A party may store up to 50 percent of the party’s Allowed Pumping Allocation in an Individual Storage Account and 150 percent of the party’s Allowed Pumping Allocation in a Community Storage Account if space is available. The amendments also allow parties to convert unused Allowed Pumping Allocation to stored water and revised the amount of carryover to be equal to 60 percent of the party’s Allowed Pumping Allocation minus the amount of carryover water set aside for storage. The purpose of the storage program creates an added reliability in water supply from the Central Basin.

DISTRIBUTION SYSTEM WATER LOSS
CWC 10631.
(d)(3)(A) The distribution system water loss shall be quantified for each of the five years preceding the plan update, in accordance with rules adopted pursuant to Section 10608.34. (B) The distribution system water loss quantification shall be reported in accordance with a worksheet approved or developed by the department through a public process. The water loss quantification worksheet shall be based on the water system balance methodology developed by the American Water Works Association.
(C) In the plan due July 1, 2021, and in each update thereafter, data shall be included to show whether the urban retail water supplier met the distribution loss standards enacted by the board pursuant to Section 10608.34.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-18

4.3.1 PREVIOUS FIVE YEARS DISTRIBUTION SYSTEM LOSSES
Distribution system water losses represent the potable water losses from the pressurized water distribution system and water storage facilities, up to the point of delivery to the customers. Sources of distribution system water loss can include: inaccurate metering due to faulty meters; water use not metered such as firefighting, flushing of the water system; and pipeline leaks.

The California Water Code Section 10608.34 requires “On or before January 1, 2024, and on or before January 1 of each year thereafter, each urban retail water supplier shall submit a completed and validated water loss audit report for the previous calendar year or the previous fiscal year...” The water loss audits must follow American Water Works Association (AWWA) guidance and be validated by a certified water audit validator. The City has completed the annual water loss audit process through January 1, 2026, as required by the California Water Code. As shown in Table 4-5, the City has completed water loss audits for the past five years representing Fiscal Year 2020-21 through Fiscal Year 2024-25. The City’s water loss audits were prepared and validated pursuant to DWR requirements. The annual water loss audit reports submitted by retail water agencies in California, including the City, are available on DWR’s WUEdata website (https://wuedata.water.ca.gov/awwa_plans).

The City’s annual water loss audits identify real water losses (e.g. leaks and main failures) and apparent water losses (e.g. customer meter inaccuracies, systematic data handling errors in customer billing systems, and unauthorized consumption). The City’s distribution system water losses are based on the sum of the real and apparent water losses. Over the past five years, the City’s average distribution system water losses represent approximately 7.2 percent of its total water demands. This average water loss factor was incorporated into the City’s total potable water demand projections (Tables 4-2 and 4-3).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-19

4.3.2 PROGRESS TOWARD MEETING THE WATER LOSS PERFORMANCE

STANDARD
Consistent with the California Code of Regulations, Title 23, Sections 980 through 986, retail water suppliers are required to comply with Real Water Loss Performance Standards by January 1, 2028 (pursuant to SWRCB requirements). Until then, a supplier may, when calculating its Urban Water Use Objective (discussed further in Section 5.2.6), use real losses reported in the water loss audits provided to the Department of Water Resources (discussed in Section 4.3.1), rather than the standard-based budget calculated according to the equation described Section 970 of the California Code of Regulations.

Pursuant to the California Water Code Section 10631(d)(3)(C), a retail water supplier is required to provide data in its 2025 Plan demonstrating whether the retail water supplier met its Water Loss Performance Standard. The California Code of Regulations includes the following methods for compliance:
• Retail suppliers may have met their Real Water Loss Performance Standard if their 2025 or 2026 annual water loss audits (currently not available) show actual real water loss at or below the standard (California Code of Regulations Section 981[b]). • Retail suppliers may still meet the Real Water Loss Performance Standard if, by January 1, 2028, their 2027 annual water loss audit shows actual real water loss at or below the standard (California Code of Regulations Section 981[a] and [b]). • Apparent Water Loss Performance Standards are evaluated at the time compliance with the Real Water Loss Performance Standard is assessed (California Code of Regulations Section 981[d]).

The City’s 2025 water loss audit is due by January 1, 2027 and was not available during the preparation, completion, and submittal of the City’s 2025 Plan. However, Table 4-6 presents the City’s Real Water and Apparent Loss Performance Standard, as well as Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-20
the real and apparent water losses included in the City’s most recent 2024 water loss audit.

The City will continue to improve data collection for assessing and reducing water losses while performing proactive measures to minimize real losses. City field personnel are trained to spot leaks and verify if water from fire hydrants is metered, permitted, or if the water is taken without authorization.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-21

SUBMITTAL TABLES
The applicable standardized Submittal Tables referenced within Chapter 4 are provided below.

4.4.1 TABLE 4-1: TOTAL USES FOR POTABLE AND NON-POTABLE

WATER-ACTUAL
Table 4-1 Total Uses for Potable and Non-Potable Water – Actual

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 NonPotable
(OPTIONAL)
Drop down list
Volume (AF)
Single Family Potable 7
Multi-Family Potable 11
Commercial Potable 3,174
Industrial Potable 948
Other (optional) Recycled Water for Malburg
Power Plant Non-Potable 408
Other (optional) Non-Residential Potable 10
Distribution System Water Loss Potable 321
4471
408
Total 4,879
Submittal Table 4-1 Retail: Total Uses for Potable and Non-Potable Water — Actual Water Code Section 10631(d)(1)
NOTES:

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. 2025 Actual Water Use
Add additional rows as needed
Subtotal Potable
Subtotal Non-Potable
Additional Description
(as needed)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-22

4.4.2 TABLE 4-2: TOTAL USES OF POTABLE AND NON-POTABLE
WATER—PROJECTED
Table 4-2 Total Uses of Potable and Non-Potable Water – Projected

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 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 opt (AF)
Single Family Potable 11 11 11 11 11
Multi-Family Potable 129 466 466 467 468
Commercial Potable 4,926 4,926 4,926 4,926 4,926
Industrial Potable 1,471 1,471 1,471 1,471 1,471
Other (optional) Recycled Water for Malburg
Power Plant Non-Potable 500 500 500 500 500
Other (optional) Non-Residential Potable 16 16 16 16 16 Distribution System Water Loss Potable 499 499 499 499 499 7,052 7,389 7,389 7,390 7,391
500 500 500 500 500
7,552 7,889 7,889 7,890 7,891
Add additional rows as needed.

Submittal Table 4-2 Retail: Total Uses for Potable, and Non-PotableWater — Projected Water Code Section 10631(d)(1)
Projected Water Use
(Report To the Extent that Records are Available)
Additional Description
(as needed)
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 selected in Submittal Table 2-3.

Subtotal Non-Potable
Subtotal Potable
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-23

4.4.3 TABLE 4-3: INCLUSION IN WATER-USE PROJECTIONS
Table 4-3 Inclusion in Water Use Projections

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.

Section 4.2.5
and Chapter
8 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.

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:

DWR NOTES: Additional guidance is provided in Appendix K.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-24

4.4.4 OPTIONAL TABLE 4-4: PASSIVE WATER SAVINGS PROJECTION DWR has deemed Table 4-4 to be optional.

Table 4-3 Passive Savings Projection

4.4.5 TABLE 4-5: WATER LOSS AUDIT REPORTING
Table 4-4 Water Loss Audit Report

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)
DWR NOTES: Suppliers will provide a link to the WUEdata submittals of their Water Loss Audit Reports.

NOTES:

Report submittal status for all five years for each Public Water System as available.

Add rows as needed
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 4-25

4.4.6 TABLE 4-6: PROGRESS TOWARD 2028 WATER LOSS STANDARD Table 4-5 Progress Toward 2028 Water Loss Standard
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)
(AF)
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)
(AF)
CA1910167 Yes 661.8
Gallons per
Mile per Day
(GPMD)
51 82.83 1,449.9 183.8
Gallons per
Service
Connection per
Day (GPSCD)
1215 111.719 82.1
Gallons per
Service
Connection per
Day (GPSCD)
Gallons per
Service
Connection per
Day (GPSCD)
Submittal Table 4-6 Retail: Progress Towards 2028 Water Loss Standard Water Code Section 10631(d)(3)(C)
NOTES:

Apparent Water Loss
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
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.

Public Water
System ID #
Reported in
Submittal Table 2-
1 R
Add additional rows as needed.

Most Recent AWWA Water Loss Audit
Real Water
Loss Per Unit
per Day
Most Recent AWWA Water Loss Audit
Apparent Water
Loss Per Unit per
Day
State Water Board Standard State Water Board Standard
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-1
CHAPTER 5
SB X7-7 BASELINE, 2020 TARGETS, AND 2025 REPORTING
LAY DESCRIPTION – CHAPTER 5
SB X7-7 BASELINES, 2020 TARGETS, AND 2025 REPORTING
Chapter 5 (SB X7-7 Baselines, 2020 Targets, and 2025 Reporting) of the City’s 2025 Plan discusses and provides the following:
 The Water Conservation Act of 2009 (or SB X7-7) required the State of California achieve a 20 percent reduction in urban water use by the year 2020.  SB X7-7 required urban water suppliers, including the City, to develop a “2020 Water Use Target” to assist the State of California to achieve the 20 percent reduction. The 2020 Water Use Target represents the amount of water each person should use per day (i.e. gallons per capita per day or GPCD) by the year 2020.
 The City previously determined its 2020 Water Use Target during the preparation of its 2015 Plan by completing standardized tables (or the SB X7-7 Verification Form) to demonstrate compliance with the Water Conservation Act of 2009. The City’s 2020 Water Use Target was 89,809 GPCD.
 The City’s per-capita water use during Calendar Year 2020 was 59,814 GPCD.

The City’s confirmed 2020 Water Use Target was 89,809 GPCD. The City’s percapita water use during Calendar Year 2020 met the 2020 Water Use Target.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-2

REPORTING REQUIREMENTS FOR WHOLESALE SUPPLIERS
CWC 10608.12.
(aj) “Urban wholesale water supplier,” means a water supplier, either publicly or privately owned, that provides more than 3,000 acre-feet of water annually at wholesale for potable municipal purposes.

CWC 10608.36.

Urban wholesale water suppliers shall include in the urban water management plans required pursuant to Part 2.6 (commencing with Section 10610) an assessment of their present and proposed future measures, programs, and policies to help achieve the water use reductions required by this part.

The City is not a wholesale agency and is not required by DWR to complete Section 5.1.

REPORTING REQUIREMENTS FOR RETAIL SUPPLIERS
CWC 10608.40.

Urban water retail suppliers shall report to the department on their progress in meeting their urban water use targets as part of their urban water management plans submitted pursuant to Section 10631.

CWC 10608.12.
(af) “Urban retail water supplier” means a water supplier, either publicly or privately owned, that directly provides potable municipal water to more than 3,000 end users or that supplies more than 3,000 acre-feet of potable water annually at retail for municipal purposes.

The Water Conservation Act of 2009 (or SB X7-7) required the State of California achieve a 20 percent reduction in urban water use by the year 2020. SB X7-7 required urban water suppliers, including the City, to develop a “2020 Water Use Target” to assist the Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-3
State of California to achieve the 20 percent reduction. The 2020 Water Use Target represents the amount of water each person should use per day (i.e. gallons per capita per day or GPCD) by the year 2020.

The City previously determined its 2020 Water Use Target during the preparation of its 2015 Plan by completing standardized tables (or the SB X7-7 Verification Form) to demonstrate compliance with the Water Conservation Act of 2009. The City’s SB X7-7 Verification Form was also included in its 2020 Plan. The City’s 2020 Water Use Target was 89,809 GPCD.

5.2.1 SUPPLIER WAS NOT AN URBAN RETAIL WATER SUPPLIER
Section 5.2.1 is not applicable to the City.

The City was an urban retail water supplier during and before the 2020 Plan cycle.

5.2.2 SUPPLIER MET 2020 TARGET IN 2020
The City previously calculated its “2020 Water Use Target” in its 2015 Plan pursuant to the methodology provided by DWR. The City’s 2020 Water Use Target was confirmed to be 89,809 GPCD.

As discussed in the City’s 2020 Plan, the City’s per-capita water use during CY 2020 was 59,814 GPCD. As shown in Table 5-1, the City’s per-capita water use during CY 2020 meets the 2020 Water Use Target. The City also demonstrated compliance with the 2020 Water Use Target by completing the SB X7-7 2020 Compliance Form (included in the 2020 Plan).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-4

5.2.3 SUPPLIER DID NOT MEET 2020 TARGET IN 2020—NO CHANGE TO

SERVICE AREA
Section 5.2.3 is not applicable to the City.

As indicated in Section 5.2.2, the City previously met its 2020 Water Use Target as part of the 2020 Plan.

5.2.4 SUPPLIER DID NOT MEET 2020 TARGET—CHANGE TO SERVICE AREA SINCE 2020
Section 5.2.4 is not applicable to the City.

As indicated in Section 5.2.2, the City previously met its 2020 Water Use Target as part of the 2020 Plan. In addition, the City has not had any changes to its service area since 2020.

5.2.5 FUNDING ELIGIBILITY
CWC 10608.56.
(a) On and after July 1, 2016, an urban retail water supplier is not eligible for a water grant or loan awarded or administered by the state unless the supplier complies with this part.

If a retail water supplier does not achieve its 2020 Water Use Target, the retail water supplier is not eligible to receive a water grant or loan from the State of California until it complies. The following two exceptions to this are provided:

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-5
 Water Code Section 10608.56(c) states that a water supplier shall be eligible for a water loan or grant if it “has submitted to the department for approval a schedule, financing plan, and budget, to be included in the grant or loan agreement, for achieving the per-capita reductions.”
 Water Code Section 10608.56(e) states that a water supplier can also be eligible for a water loan or grant if it “has submitted to the department for approval documentation demonstrating that its entire service area qualifies as a disadvantaged community.”
As indicated in Section 5.2.2, the City previously met its 2020 Water Use Target as part of the 2020 Plan.

5.2.6 NEXUS TO STATE WATER BOARD URBAN WATER-USE
OBJECTIVES (NOT REQUIRED FOR UWMPs)
SWRCB’s “Making Conservation A Way of Life Regulation” (under the California Code of Regulations, Title 23, Section 965 et seq) requires urban retail water suppliers to annually calculate and comply with an Urban Water Use Objective (UWUO); carry out commercial, industrial, and institutional (CII) performance measures; and provide progress reports.

The regulation is expected to reduce inefficient water use and protect water supplies from the effects of rising temperatures and drier conditions due to climate change.

The Urban Water Use Objective is the sum of standard-based water use budgets for efficient residential indoor use, residential outdoor use, CII landscapes with dedicated irrigation meters (DIMs), and real water losses. Each budget is the product of the applicable standard and the water supplier’s unique characteristics (e.g., population).

Water suppliers will be assessed for compliance with their overall objective, not each standards-based budget.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-6
The residential indoor water use standard is based on 55 GPCD (until December 31, 2024), 47 GPCD (from January 1, 2025 to January 1, 2030), and 42 GPCD (beginning January 1, 2030). The residential outdoor water standard is based on a landscape efficiency factor (representing plant factors and irrigation efficiency) of 0.80 (until June 30, 2035), 0.63 (from July 1, 2035 to June 30, 2040), and 0.55 (beginning July 1, 2040). The standard for commercial, industrial, and institutional (CII) landscapes is based on a landscape efficiency factor of 0.80 (until June 30, 2035), 0.63 (from July 1, 2035 to June 30, 2040), and 0.45 (beginning July 1, 2040). Urban retail water suppliers are also required to comply with real water loss standards by January 1, 2028.

DWR has indicated that compliance with the Urban Water Use Objective requirements are under the authority of the SWRCB and that the requirements are not part of Urban Water Management Plan content requirements. However, the SWRCB uses the 2020 Water Use Targets as a back stop for the Urban Water Use Objective calculations. The Urban Water Use Objectives, together with excluded demands, are to be more efficient than the 2020 Water Use Targets.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 5-7

SUBMITTAL TABLES
The applicable standardized Submittal Table referenced within Chapter 5 is provided below.

Table 5-1 SB X7-7 2020 Target Progress
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-1
CHAPTER 6

NORMAL-YEAR WATER SUPPLY CHARACTERIZATION
LAY DESCRIPTION – CHAPTER 6

NORMAL-YEAR WATER SUPPLY CHARACTERIZATION
Chapter 6 (Normal-Year Water Supply Characterization) of the City’s 2025 Plan discusses and provides the following:
 The City’s water supply sources include: groundwater pumped from the Central Basin, imported water purchased from MWD through CBMWD, and recycled water purchased from the Sanitation Districts of Los Angeles County through CBMWD.  A tabulation of the City’s historical water supplies is provided in Section 6.1.  A discussion regarding the City’s imported water supplies from CBMWD is provided. Information regarding imported water connections, capacities, reliability, and historical production is provided.
 A discussion regarding the City’s groundwater supplies from the Central Basin is provided. Information regarding basin location, adjudication, management, water levels, water quality, water rights, and historical production is provided.  A discussion regarding the City’s recycled water supplies is provided. The City’s recycled water supplies are produced by CBMWD. The City provides recycled water to the Malburg Power Plant for cooling and process water.  The City’s proposed future projects to maximize its water supply resources are discussed.
 The City’s “energy intensity” is discussed and represents the quantity of energy consumed, measured in kilowatt hours, divided by the volume of water, measured Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-2
in acre-feet over a one-year period. The total energy intensity associated with the City’s water management processes was estimated during CY 2025.

In this Chapter, the City will identify and describe each of its sources of water supply. In addition, the City will describe the following:
 Management of each water supply source;
 Current provisions of a basin adjudication or Groundwater Sustainability Plan (GSP), as applicable, pertaining to management of groundwater supplies;  Measures the City is taking to develop potential new sources of water supply (as applicable); and
 Opportunities for exchanges and transfers on a long- or short-term basis.

The characterization of the City’s water supply sources will account for the anticipated availability during a normal year, a single dry year, a five consecutive year drought, along with projections through CY 2050.

WATER SUPPLY ANALYSIS OVERVIEW
CWC 10631.
(b) Identify and quantify, to the extent practicable, the existing and planned sources of water available to the supplier over the same five-year increments described in subdivision (a), providing supporting and related information, including all of the following:
(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. (2) When multiple sources of water supply are identified, a description of the management of each supply in correlation with the other identified supplies.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-3
(3) For any planned sources of water supply, a description of the measures that are being undertaken to acquire and develop those water supplies.

CWC 10631.
(h) … The wholesale agency shall provide information to the urban water supplier for inclusion in the urban water supplier’s plan that identifies and quantifies, to the extent practicable, the existing and planned sources of water as required by subdivision (b), available from the wholesale agency to the urban water supplier over the same five-year increments, and during various water-year types in accordance with subdivision (f). An urban water supplier may rely upon water supply information provided by the wholesale agency in fulfilling the plan informational requirements of subdivisions (b) and (f).

The City’s source of water supply includes: groundwater pumped from the Central Basin; treated, imported water from Metropolitan Water District of Southern California through Central Basin Municipal Water District; and recycled water purchased from the Sanitation Districts of Los Angeles County through Central Basin Municipal Water District. The City’s main sources of water supplies is groundwater pumped from the Central Basin. A tabulation of the City’s historical water supplies is provided below.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-4
Calendar
Year
System Water Supply Sources (AF)
Total
Potable Water
Recycled
Groundwater Water
Central Basin
Imported Water
CBMWD
2011 6,919 1,115 671 8,705
2012 7,262 699 711 8,672
2013 7,321 644 791 8,756
2014 6,860 687 847 8,395
2015 6,678 774 765 8,217
2016 6,098 1,060 804 7,962
2017 6,566 449 729 7,744
2018 6,569 188 585 7,342
2019 5,852 972 618 7,442
2020 6,147 573 773 7,494
2021 6,682 2 756 7,440
2022 6,221 0 598 6,819
2023 4,812 0 420 5,232
2024 4,656 0 424 5,081
2025 4,471 0 408 4,879
Source: Data provided by the City

6.1.1 SPECIFIC ANALYSIS APPLICABLE TO ALL WATER SUPPLY

SOURCES
The section below provides a discussion of the following information to the extent practical:
 The City’s existing and planned sources of water supply are identified;  Each source of supply is quantified in five-year increments through CY 2050;  The anticipated supply availability under normal, single dry, and five consecutive dry years, and any other water year conditions included in the Drought Risk Assessment (see Chapter 7) are described;
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-5
 The management of each water supply in correlation with other identified supplies is described.
 Information pertinent to the reliability analysis, including climate change effects, is considered.

The City historically has relied on groundwater pumped from the Central Basin; treated, imported water from Metropolitan Water District of Southern California through Central Basin Municipal Water District; and recycled water purchased from the Sanitation Districts of Los Angeles County through Central Basin Municipal Water District. The following descriptions summarize the City’s sources of supply (detailed descriptions are provided in Section 6.2).

Existing and Planned Sources of Supply
Purchased Treated Imported Water
The City has historically purchased treated imported water from the Central Basin Municipal Water District, as described in Section 6.2.1. In addition, Section 6.2.1 provides a detailed discussion of the existing and planned supply of the treated imported water, including a description of the management and reliability of those treated imported water supplies. Table 6-8 summarizes the actual treated imported water supply for CY 2025. In addition, Table 6-9 summarizes the projected water supply, in five-year increments, through FY 2050 under varying water supply conditions.

Groundwater
The City has historically pumped groundwater directly from the Central Basin as described in Section 6.2.2. In addition, Section 6.2.2 provides a detailed discussion of the existing and planned supply of the groundwater, including a description of the Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-6
management and reliability of those groundwater supplies. Table 6-8 summarizes the actual groundwater supplies for CY 2025. In addition, Table 6-9 summarizes the projected water supply, in five-year increments, through CY 2050 under varying water supply conditions.

Storm Water
The City has historically received groundwater from the Central Basin. Management and use of the stormwater runoff by WRD, which is crucial to groundwater management, is described in Section 6.2.4. However, the City currently does not have its own program to beneficially use stormwater runoff as a direct source of supply.

Wastewater and Recycled Water
The City has historically purchased recycled water supplies from Sanitation Districts of Los Angeles County through Central Basin Municipal Water District as described in Section 6.2.5. In addition, Section 6.2.5 provides a detailed discussion of the existing and planned use of the recycled water, including a description of the management and reliability of those recycled water supplies. Table 6-8 summarizes the actual recycled water supplies for CY 2025. In addition, Table 6-9 summarizes the projected recycled water supply, in five-year increments, through CY 2050 under varying water supply conditions.

6.1.2 SPECIAL CONDITIONS
The City considered the issues described below when developing its planned sources of water supply.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-7

6.1.2.1 CLIMATE CHANGE EFFECTS
Climate change has the possibility of impacting the availability of planned water supplies, particularly during a drought period. Section 4.2.5.6 of this Plan provides a discussion regarding climate change effects on the City’s various sources of supply.

6.1.2.2 REGULATORY CONDITIONS AND PROJECT DEVELOPMENT
The City has considered the implications of emerging regulatory conditions and project development on the availability of planned water supplies. Section 1.4 provides a discussion on the reduced reliance on imported water supplies as well as the proposed Pure Water Southern California recycled water project.

6.1.2.3 OTHER LOCALLY APPLICABLE CRITERIA
There are no locally applicable criteria which applies to the City.

6.1.2.4 WHOLESALE AND RETAIL SUPPLIERS COORDINATION
Because the City relies on wholesale water supplies, the City has provided its 2025 Plan to CBMWD as discussed in Section 2.4.1.

WATER SUPPLY CHARACTERIZATION

6.2.1 PURCHASED OR IMPORTED WATER
The City purchases treated imported water from MWD through CBMWD.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-8

CENTRAL BASIN MUNICIPAL WATER DISTRICT
As a wholesale agency, MWD distributes imported water to 26 member agencies throughout Southern California. CBMWD is one of the member agencies served by MWD.

CBMWD distributes water to its retail agencies, including the City of Vernon. The City can purchase imported water from CBMWD through its CENB-38 which has a capacity of 30 cubic feet per second. As tabulated in Section 6.1, the City has purchased between 0 AF and 2 AF of water from CBMWD over the past five years. Imported water is currently only used as an emergency supply. Regular use of imported water is not currently planned, however, the City may use imported water in the future for blending or as a backup supply if many wells are down for maintenance or treatment construction. The City’s projected water purchases from CBMWD, over the next 25 years in five-year increments, is provided in Table 6-9.

The City’s treated imported water supplies from MWD, through CBMWD, may be impacted during a multi-year drought or other conditions which limits MWD from delivering sufficient water supplies to all of its member agencies, and consequently to the City. In anticipation of such a reduction in supplies, MWD developed a Water Supply Allocation Plan (WSAP) which is briefly described below. The WSAP provides a means of equitably providing reduced water supplies to each of MWD’s member agencies for up to 10 levels of reduction representing up to a 50 percent reduction.

During calendar year 2007, critically dry conditions impacted MWD’s water supply sources. In addition, a ruling in the Federal Courts in August 2007 provided protective measures for the Delta Smelt (and subsequently other aquatic species) in the Sacramento-San Joaquin River Delta resulting in restrictions on the availability of State Water Project water. As a result, MWD adopted a Water Supply Allocation Plan in February 2008 to allocate available water supplies to its member agencies. MWD revised the WSAP in December 2014.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-9
The WSAP establishes ten different shortage levels and a corresponding Allocation to each member agency. Based on the shortage levels established by MWD, the WSAP provides a separate reduced Allocation to a member agency for its 1) Municipal and Industrial (M&I) retail demand and 2) replenishment demand. The WSAP formula considers historical local water production, full service treated water deliveries, agricultural deliveries and water conservation efforts when calculating each member agency’s Allocation.

In general, the WSAP process calculates total historical member agency demand. That historical demand is then compared to member agency projected local supply for a specific Allocation year. The balance required from MWD, less an Allocation reduction factor, is the member agency’s “Water Supply Allocation” of imported water from MWD.

When a member agency reduces its local demand through conservation or other means, the Allocation of imported water will increase. Depending on MWD’s available supply, MWD can establish a specific WSAP shortage level. The shortage level causes a regional reduction and calculates an allocation for each of its member agency. Additional information about MWD’s WSAP is provided in MWD’s Regional 2025 UWMP which is incorporated by reference. The following is a summary of MWD’s water shortage levels:

Level 1 – Regional Percent Reduction of 5%
Level 2 – Regional Percent Reduction of 10%
Level 3 – Regional Percent Reduction of 15%
Level 4 – Regional Percent Reduction of 20%
Level 5 – Regional Percent Reduction of 25%
Level 6 – Regional Percent Reduction of 30%
Level 7 – Regional Percent Reduction of 35%
Level 8 – Regional Percent Reduction of 40%
Level 9 – Regional Percent Reduction of 45%
Level 10 – Regional Percent Reduction of 50%
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-10
In response to a fourth consecutive year of below average rainfall and critically dry conditions, MWD declared a WSAP Allocation Level 3 for fiscal year 2015-16, which represented a regional reduction of 15 percent. MWD rescinded the WSAP for fiscal year 2016-17 and has not reinstated the WSAP since that time.

6.2.2 GROUNDWATER
CWC 10631.
(b)(4) If groundwater is identified as an existing or planned source of water available to the supplier, all of the following information:
(A) The current version of any groundwater sustainability plan or alternative adopted pursuant to Part 2.74 (commencing with Section 10720), any groundwater management plan adopted by the urban water supplier, including plans adopted pursuant to Part 2.75 (commencing with Section 10750), or any other specific authorization for groundwater management for basins underlying the urban water supplier’s service area.
(B) A description of any groundwater basin or basins from which the urban water supplier pumps groundwater. For basins that a court or the board has adjudicated the rights to pump groundwater, a copy of the order or decree adopted by the court or the board and a description of the amount of groundwater the urban water supplier has the legal right to pump under the order or decree. For a basin that has not been adjudicated, information as to whether the department has identified the basin as a high- or medium-priority basin in the most current official departmental bulletin that characterizes the condition of the groundwater basin, and a detailed description of the efforts being undertaken by the urban water supplier to coordinate with groundwater sustainability agencies or groundwater management agencies listed in subdivision (c) of Section 10723 to maintain or achieve sustainable groundwater conditions in accordance with a groundwater sustainability plan or alternative adopted pursuant to Part 2.74 (commencing with Section 10720).
(C) A detailed description and analysis of the location, amount, and sufficiency of groundwater pumped by the urban water supplier for the past five years. The description and analysis shall be based on information that is reasonably available, including, but not limited to, historic use records.
(D) A detailed description and analysis of the amount and location of groundwater that is projected to be pumped by the urban water supplier. The description and analysis shall be based on information that is reasonably available, including, but not limited to, historic use records.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-11

CENTRAL BASIN
Central Basin - Sustainable Groundwater Management Act
The Central Basin is a subbasin of the Coastal Plain of Los Angeles Groundwater Basin pursuant to DWR Bulletin 118, Basin Number 4-11.04. Pursuant to the Sustainable Groundwater Management Act of 2014 (SGMA), the Central Basin was named as an adjudicated groundwater basin and is exempt from the requirements of developing a Groundwater Sustainability Plan and subsequently was designated a very-low-priority basin in DWR’s 2019 SGMA Basin Prioritization report. In compliance with SGMA, the Central Basin Watermaster (which is the Water Replenishment District of Southern California) submits its Annual Report to DWR.

Central Basin - Adjudication
On January 2, 1962, the Central and West Basin Water Replenishment District (now the Water Replenishment District of Southern California) filed Case No. 786,656 in the Superior Court, County of Los Angeles, naming more than 700 parties as defendants. It sought to adjudicate water rights of groundwater and regulate pumping from the Central Basin. By September 1962, a proposed agreement had been approved by a sufficient number of water producers (producers owning over 75 percent of the Assumed Relative Rights within Central Basin) to guarantee control over groundwater pumping in Central Basin. On September 28, 1962, the Court signed the “Order Pursuant to Stipulation and Interim Agreement and Petition for Order” and appointed the Department of Water Resources as Watermaster.

Subsequently, a stipulated judgment was drafted. Approval was received by public utility water companies and other producers representing well over 200,000 AF, or 75 percent, of the total rights within Central Basin. This was a prerequisite to filing the stipulated Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-12
judgment with the Court. On May 17, 1965, the case went to trial before Judge Edmund M. Moor. Following testimony on engineering, geology, hydrology, and safe yield of Central Basin and arguments on water right entitlement, the case was continued to August 25, 1965. Shortly thereafter, Judge Moor appointed DWR as Watermaster. The final Judgment was signed on October 11, 1965 and became effective on October 1, 1966.4
The Judgment was amended on March 21, 1980, to provide for a transition in the administrative year from a water year (October 1 to September 30) to a fiscal year (July 1 to June 30). Under the Judgment, this transition in turn contained a “short” administrative year of nine months (from October 1, 1980 to June 30, 1981). The administrative year starting July 1, 1981 was on a fiscal year basis.

The Judgment was again amended on July 19, 1985, modifying the annual budget ($20 minimum assessment) and exchange pool provisions. The second amended Judgment of May 6, 1991 modified the carryover and overproduction provisions (to 20 percent of allowed pumping allocation or 20 AF, whichever is greater, from 10 percent of allowed pumping allocation or 10 AF), and defined drought carryover, and provided for exemptions for extractors of contaminated groundwater.

In December 2013, the Central Basin Judgment was amended (“Third Amended” Central Basin Judgment) to confirm the retirement of DWR as the Watermaster of Central Basin.

The Judgment established three separate bodies to assist the Court in the administration and enforcement of the provisions and stipulations of the Judgment. The first body is the Administrative Body, which administers Watermaster accounting and financial reporting activities. The Water Replenishment District of Southern California was appointed by the Court for this role. The second body is the Water Rights Panel, which enforces issues 4 Central and West Basin Water Replenishment District, etc. v. Charles E. Adams, et al, Los Angeles County Case No. 786,656.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-13
related to groundwater production rights as defined by the Judgment. The Water Rights panel comprises of seven elected water rights holders within the Central Basin. The third administrative body is the Storage Panel, which reviews and approves groundwater storage efforts. The Storage Panel is comprised of the Water Rights Panel and the WRD Board of Directors. A copy of the Central Basin Judgment is provided in Appendix G.

The Court approved 2013 Judgment amendments also implemented a water storage program. The amendment states, “…a party may store up to 200 percent of the party’s Allowed Pumping Allocation, if space is available.” In addition, the amendments allow parties to convert unused Allowed Pumping Allocation to stored water and revised the amount of carryover to be equal to 100 percent of the party’s Allowed Pumping Allocation minus the amount of carryover water set aside for storage, as noted above. The purpose of the storage program creates an added reliability in water supply from the Central Basin.

In addition, the amendments allow for transfer of water between Central Basin and West Basin by permitting parties with water rights in Central Basin to increase production in Central Basin, while another party decreases production in West Basin by the corresponding amount.

Under the Judgment, water rights are fixed and do not vary year to year. Water producers cannot exceed their water rights by more than 20 percent or 20 AF, whichever is greater, in any year and an adjustment is made the following year. In addition, water producers cannot carry over more than 20 percent or 20 AF, whichever is greater, of their water rights for use in the following year. In addition, the Central Basin Judgment includes an amendment which implemented a water storage program. A party may store up to 50 percent of the party’s Allowed Pumping Allocation in an Individual Storage Account and 150 percent of the party’s Allowed Pumping Allocation in a Community Storage Account if space is available. The amendments also allow parties to convert unused Allowed Pumping Allocation to stored water and revised the amount of carryover to be equal to 60 percent of the party’s Allowed Pumping Allocation minus the amount of carryover water Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-14
set aside for storage. The purpose of the storage program creates an added reliability in water supply from the Central Basin.

Central Basin - Description
Central Basin is one of two groundwater basins in the Coastal Plain of Los Angeles County. It is comprised of Quaternary-age sediments (less than 1.8 million years old) of gravel, sand, silt, and clay that were deposited from the erosion of nearby hills and mountains, and from historical beaches and shallow ocean floors that covered the area in the past. Underlying these Quaternary sediments are basement rocks such as the Pliocene Pico Formation that generally do not provide sufficient quantities of groundwater for pumping. Separating the Central Basin from the West Coast Basin is the NIU, a series of discontinuous faults and folds that form a prominent line of northwest trending hills including the Baldwin Hills, Dominguez Hills, and Signal Hill.

Central Basin covers approximately 270 square miles and is bounded on the north by the Hollywood Basin and the Elysian, Repetto, Merced, and Puente Hills, to the east by the Los Angeles County/Orange County line, and to the south and west by the NIU. The location of the Central Basin is provided in Figure 3. DWR divided the Central Basin into four sections: the Los Angeles Forebay, the Montebello Forebay, the Whittier Area, and the Pressure Area. Pursuant to DWR Bulletin 118 (for Basin Number 4-11.04), the total storage capacity of the Central Basin is estimated at approximately 13,800,000 AF.

The aquifers of Central Basin received their water supply primarily from the surface and subsurface inflow of water from the San Gabriel Valley. The water originates as rainfall in the San Gabriel Mountains, the runoff from which is conveyed to the Los Angeles River, the Rio Hondo, and the San Gabriel River. The Los Angeles River enters Central Basin through the Los Angeles Narrows, crosses the Los Angeles Forebay Area, and proceeds south across Central Basin, exiting Central Basin through the Dominguez Gap in West Basin. The Rio Hondo, enters Central Basin at Whittier Narrows parallel to the San Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-15
Gabriel River, proceeds southwesterly across the Montebello Forebay Area and joins the Los Angeles River midway across the Basin. The San Gabriel River also enters Central Basin through the Whittier Narrows, crosses the Montebello Forebay, and runs south to the Pacific Ocean near Long Beach at the Orange County line.

As the Rio Hondo and San Gabriel River flow through the Upper San Gabriel Valley toward Whittier Narrows, much of their flow percolates into the Main Basin. This water crosses the Whittier Narrows and enters Central Basin as subsurface flow into the aquifers of Central Basin. At the same time, the surface flows of the Rio Hondo and the San Gabriel River percolate downward into the aquifers of Central Basin in the Montebello Forebay. In the Montebello Forebay, the underground aquifers merge and are unconfined, and thus are capable of receiving large quantities of water from percolation through the sand and gravel surface of the forebay area.

The Los Angeles Forebay area is also favorably situated for percolation from the flows of the Los Angeles River, but the Los Angeles Forebay has been largely eliminated as a source of freshwater replenishment to Central Basin, due to lining of the Los Angeles River channel and the impervious surface in the forebay area. In the Montebello Forebay area, by contrast, flood flows have been largely controlled through the construction of the Whittier Narrows Dam, and the river channels have not been lined in the area, so percolation still occurs.

Groundwater in the Central Basin provides a substantial portion of the water supply needed by residents and industries in the overlying area. Groundwater occurs in the pore spaces of the sediments in the basin. The major aquifers identified in Central Basin include the following, from shallowest to deepest: a) the Gaspur and semi-perched aquifers of the Holocene Alluvium Formation; b) the Exposition, Artesia, Gage, and Gardena aquifers of the Upper Pleistocene Lakewood Formation; c) the Hollydale, Jefferson, Lynwood, and Silverado aquifers of the Lower Pleistocene Upper San Pedro Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-16
Formation; and d) the Sunnyside Aquifer of the Lower Pleistocene Lower San Pedro Formation.

WRD’s Leo J. Vander Lans Advanced Water Treatment Facility (LVL) was built in 2003 and expanded in 2014. The facility is located in the City of Long Beach and currently produces about 8 MGD of advanced treated water for injection at the Alamitos Barrier in Long Beach. The LVL also injects tertiary treated recycled water from the Los Angeles County Sanitation District’s Long Beach Water Reclamation Plant. By injecting the LVL’s advanced treated water and effluent from the Long Beach Water Reclamation Plant, groundwater supply is replenished and seawater intrusion is prevented.

The WRD Board of Directors established the Water Independence Now program in 2003 to protect the security of the region’s groundwater supplies. The WIN program is comprised of various projects that include expansions to existing water treatment facilities, spreading activities, and stormwater capture. The largest component of the WIN program is the Albert Robles Center for Water Recycling & Environmental Learning (formerly the Groundwater Reliability Improvement Program), which was completed in 2019. The purpose of the Albert Robles Center is to reduce demand for imported water at the Rio Hondo and San Gabriel Coastal Spreading Grounds. The Albert Robles Center includes ultrafiltration, reverse osmosis, and ultraviolet disinfection and advanced oxidation to treat recycled water by significantly reducing the total dissolved solids concentration.

Groundwater quality is monitored by WRD. Groundwater in the Central Basin is currently contaminated with natural metals such as arsenic, iron and manganese, Volatile Organic Chemicals (VOCs), including trichloroethylene (TCE) and perchloroethylene (PCE), 1,4- Dioxane, Perchlorate, and Per- and Poly-Fluoroalkyl Substances (PFAS). In addition, Total Dissolved Solids (TDS) concentrations exceed drinking water quality standards.

Wellhead treatment is necessary in these areas to allow delivery of the groundwater for potable purposes.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-17
As previously discussed, DWR divided the Central Basin into four sections: the Los Angeles Forebay, the Montebello Forebay, the Whittier Area, and the Pressure Area.

Below is a discussion of groundwater level changes, pursuant to WRD’s 2026 Engineering Survey and Report.
 In the Los Angeles Forebay, the water level high was observed in 1938 with an elevation of approximately 70 feet above mean sea level (msl) and by 1962, the water levels had fallen by 180 feet to an elevation of 109 feet below msl due to over pumping and lack of recharge. Water levels have improved since then due to pumping rights adjudication and managed aquifer recharge. In 2023, the groundwater levels were at an elevation of 12.65 feet below msl.  In the Montebello Forebay, the water level high was observed in 1942 with an elevation of approximately 137.8 feet above mean sea level (msl) and by 1958, the water levels had fallen by 117 feet to an elevation of 20.9 feet above msl due to over pumping and lack of recharge. Water levels have improved since then due to pumping rights adjudication and managed aquifer recharge. In 2025, the groundwater levels were at an elevation between 69.25 and 116.72 feet above msl.
 In the Pressure Area, the water level high was observed in 1935 at about 10 feet above msl when they began to continually decline by over 110 feet until the observed low of about 120 feet below msl in 1961 due to over pumping and lack of recharge. Groundwater levels improved during the early 1960s due to replenishment operations. Between 1995 and 2007, there were 100-foot swings in water levels as a result of seasonal pumping from producers. Water levels have improved since then due to pumping rights adjudication and managed aquifer Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-18
recharge. In 2025, the groundwater levels were at elevations between 42.86 and

71.33 feet below msl.
 Long-term hydrographs and records were not maintained for the Whittier Area; however, groundwater levels have been tracked from recently constructed monitoring wells. Overall, groundwater elevations increased within the Whittier Area.

Central Basin - Historical and Projected Basin Production The City currently produces groundwater from the Central Basin. The City’s current Allowed Pumping Allocation in the Central Basin is 7,539.00 AFY. The City’s production over the past five years has been tabulated in Section 6.1. Over the past five years, the City has produced 4,471 AFY to 6,682 AFY, with an average of 5,368 AFY from the Central Basin. The City’s projected production from the Central Basin, over the next 25 years in five-year increments, is provided in Table 6-9.

6.2.3 SURFACE WATER
The City does not use surface water supplies to meet its water demands.

6.2.4 STORMWATER
The City does not directly use stormwater to meet its water demands.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-19

6.2.5 WASTEWATER AND RECYCLED WATER
CWC 10633R.

The plan shall provide, to the extent available, information on recycled water and its potential for use as a water source in the service area of the urban water supplier. The preparation of the plan shall be coordinated with local water, wastewater, groundwater, and planning agencies that operate within the supplier’s service area, and shall include all of the following:
(a) A description of the wastewater collection and treatment systems in the supplier’s service area, including a quantification of the amount of wastewater collected and treated and the methods of wastewater disposal.
(b) A description of the quantity of treated wastewater that meets recycled water standards, is being discharged, and is otherwise available for use in a recycled water project. (c) A description of the recycled water currently being used in the supplier’s service area, including, but not limited to, the type, place, and quantity of use. (d) A description and quantification of the potential uses of recycled water, including, but not limited to, agricultural irrigation, landscape irrigation, wildlife habitat enhancement, wetlands, industrial reuse, potable reuse, and other appropriate uses, and a determination with regard to the technical and economic feasibility of serving those uses. (e) The projected use of recycled water within the supplier’s service area at the end of 5, 10, 15, and 20 years, and a description of the actual use of recycled water in comparison to uses previously projected pursuant to this subdivision.
(f) A description of actions, including financial incentives, which may be taken to encourage the use of recycled water, and the projected results of these actions in terms of acre-feet of recycled water used per year.
(g) A plan for optimizing the use of recycled water in the supplier’s service area, including actions to facilitate the installation of dual distribution systems, to promote recirculating uses, to facilitate the increased use of treated wastewater that meets recycled water standards, and to overcome any obstacles to achieving that increased use.

Discussion of wastewater collection, treatment, and recycled water use is included in this chapter. Municipal recycled water is municipal wastewater that has been treated from a municipal wastewater facility to a specified quality to enable it to be used again for a beneficial purpose. Municipal wastewater must meet two requirements; it must be reused Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-20
beneficially pursuant to Title 22 of the California Code of Regulations and it must be reused in accordance with a Regional Water Quality Control Board permit. Title 22 of the California Code of Regulations defines beneficial reuse of recycled water as “the use of recycled water that has been transported from the point of treatment or production to the point of use without an intervening discharge to water of the State.” The City has one recycled water connection within its service area to deliver recycled water to the Malburg Power Plant for cooling and process water.

6.2.5.1 RECYCLED WATER COORDINATION
CWC 10633.

The plan shall provide, to the extent available, information on recycled water and its potential for use as a water source in the service area of the urban water supplier. The preparation of the plan shall be coordinated with local water, wastewater, groundwater, and planning agencies that operate within the supplier’s service area…
The City’s 2025 Plan was prepared in coordination with local water, wastewater, groundwater, and planning agencies within its service area to analyze the current and projected wastewater supply for collection, treatment, disposal, and distribution.

Wastewater from the City’s service area is collected and treated at the Los Coyotes WRP and the A.K. Warren Water Resource Facility (formerly known as the Joint Water Pollution Control Plant), which are owned and operated by LACSD. CBMWD then purchases recycled water from LACSD and distributes it throughout its service area, including the City’s service area.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-21

6.2.5.2 WASTEWATER COLLECTION, TREATMENT, AND DISPOSAL

CWC 10633.
(a) A description of the wastewater collection and treatment systems in the supplier’s service area, including a quantification of the amount of wastewater collected and treated and the methods of wastewater disposal.

Wastewater generated by the City is treated by LACSD. Wastewater is collected within the City’s local sewer collection system. The City’s local sewers tie into LACSD’s regional trunk sewers at multiple locations within the City’s service area. The regional trunk sewer lines deliver wastewater to the Los Coyotes WRP and the A.K. Warren Water Resource Facility owned by LACSD for treatment.

Municipal wastewater is collected from residential, commercial, and industrial customers within the City’s service area. The water reclamation plants serving the City include the Los Coyotes WRP and the A.K. Warren Water Resource Facility; however, the percentage breakdown between these two plants in treating the City’s wastewater is unknown. Based on information provided by LACSD, it is estimated approximately 69 gallons per person per day of wastewater is generated within LACSD’s service area.

Based on a CY 2025 population of approximately 200 within the City’s service area, the estimated amount of wastewater collected within the City’s service area is approximately

0.01 million gallons per day (about 15 AFY), as shown in Table 6-2.

The Los Coyotes WRP is located outside of the City of Vernon’s service area in the City of Cerritos. This treatment facility provides primary, secondary, and tertiary treatment for

37.5 MGD of wastewater and produces approximately 6 MGD of recycled water for use in areas including the City’s service area.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-22
The A.K. Warren Water Resource Facility is downstream of the Los Coyotes WRP in the City of Carson. The A.K. Warren Water Resource Facility, which began operation in 1928, currently has a treatment capacity of about 400 MGD. The treatment level is primary and secondary treatment with disinfection. The plant serves a population of approximately 4.8 million people. Solids collected in primary and secondary treatment are processed in anaerobic digestion tanks where bacteria break down organic material and produce methane gas. Treated wastewater is ultimately disinfected prior to being discharged to the Pacific Ocean. Though highly treated, effluent from the A.K. Warren Water Resource Facility does not meet recycled water standards and is therefore not re-used for such purposes. However, all water discharged to the ocean is monitored to ensure compliance with applicable local, state, and federal standards for discharge water.

The City’s wastewater is treated and disposed of outside of the City’s service area as shown in Table 6-3.

6.2.5.3 RECYCLED WATER SYSTEM DESCRIPTION
CWC 10633.
(c) A description of the recycled water currently being used in the supplier’s service area, including, but not limited to, the type, place, and quantity of use.

The City purchases recycled water from LACSD through CBMWD. CBMWD’s recycled water system consists of approximately 80 miles of pipeline serving the Cities of Bellflower, Bell Gardens, Compton, Cudahy, Downey, Huntington Park, Lakewood, Lynwood, Norwalk, Paramount, Santa Fe Springs, South Gate, and Vernon. Historically, the recycled water system has delivered water for landscape irrigation at parks, schools, freeway slopes, nursery stock irrigation, and various industrial applications. In 1994, the system was connected to the Rio Hondo recycled water distribution system. The CBMWD and Rio Hondo recycled water systems can be partially supplied with recycled water from Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-23
either the Los Coyotes or San Jose Creek WRP individually, or in combination. For sake of consistency, LACSD reports all water reuse for the CBMWD service area as recycled water coming from the Los Coyotes WRP, regardless of if the system receives water from the San Jose Creek WRP. The Rio Hondo service area is reported to receive recycled water from the San Jose Creek WRP.

The City has one recycled water connection within its service area to deliver recycled water to the Malburg Power Plant for cooling and process water. In order to deliver recycled water to the Plant, the City has constructed approximately 10,000 linear feet of recycled water pipelines.

6.2.5.4 CURRENT, POTENTIAL, AND PROJECTED RECYCLED

WATER USES
CWC 10633.
(b) A description of the recycled water currently being used in the supplier’s service area, including, but not limited to, the type, place, and quantity of use. A description of the quantity of treated wastewater that meets recycled water standards, is being discharged, and is otherwise available for use in a recycled water project. (d) A description and quantification of the potential uses of recycled water, including, but not limited to, agricultural irrigation, landscape irrigation, wildlife habitat enhancement, wetlands, industrial reuse, groundwater recharge, indirect potable reuse, and other appropriate uses, and a determination with regard to the technical and economic feasibility of serving those uses.
(e) The projected use of recycled water within the supplier’s service area at the end of 5, 10, 15, and 20 years, and a description of the actual use of recycled water in comparison to uses previously projected pursuant to this subdivision.

As shown in Table 6-4 and previously discussed in Section 6.5.3, the City has one recycled water connection within its service area to deliver recycled water to the Malburg Power Plant for cooling and process water. The current recycled water demand within the Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-24
City’s service area is shown on Table 6-4. There is no expansion planned within the City’s water service area at this time.

6.2.5.5 ACTIONS TO ENCOURAGE AND OPTIMIZE FUTURE

RECYCLED WATER USE
CWC 10633.

The plan shall provide, to the extent available, information on recycled water and its potential for use as a water source in the service area of the urban water supplier. The preparation of the plan shall be coordinated with local water, wastewater, groundwater, and planning agencies that operate within the supplier’s service area, and shall include all of the following:
(g) A plan for optimizing the use of recycled water in the supplier’s service area, including actions to facilitate the installation of dual distribution systems, to promote recirculating uses, to facilitate the increased use of treated wastewater that meets recycled water standards, and to overcome any obstacles to achieving that increased use.

Recycled water use within the City’s service area is not expected to increase significantly within the planning horizon. However, the City works collaboratively with CBMWD to encourage and optimize future recycled water use within its service area. As a subagency of CBMWD, the City has the advantage of receiving financial assistance for plumbing retrofits necessary to receive recycled water. CBMWD advances funds for the necessary plumbing retrofits, which are then reimbursed. In addition, CBMWD offers recycled water at a lower rate and the savings are passed on to City customers with nonpotable water demands. CBMWD also promotes the use of recycled water within its system as a more reliable water source than imported water. Additional details on CBMWD’s recycled water program are available in CBMWD’s 2025 Plan which is incorporated by reference.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-25

6.2.6 DESALINATED WATER OPPORTUNITIES
CWC 10631.
(g) Describe the opportunities for development of desalinated water, including, but not limited to, ocean water, brackish water, and groundwater, as a long-term supply.

Central Basin
The average TDS concentrations for the Central Basin groundwater is less than its secondary Maximum Contaminant Level (MCL) of 1,000 mg/l, based on most recent available data in the City’s groundwater wells. Consequently, the City has not needed to investigate the use of desalination to develop or reestablish a new long-term supply.

However, there may be opportunities for use of desalinated ocean water as a future potential water supply source, if needed, through coordination with other agencies that have ocean desalination programs.

6.2.7 WATER EXCHANGES AND TRANSFERS
CWC 10631.
(c) Describe the opportunities for exchanges or transfers of water on a short-term or long-term basis.

6.2.7.1 EXCHANGES
Pursuant to DWR’s 2025 Final Guidebook, “Water exchanges are typically water delivered by one water user to another water user, with the receiving water user providing water in return at a specified time or when the conditions of the parties’ agreement are Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-26
met. Water exchanges can be strictly a return of water on a basis agreed upon by the participants or it can include payment and the return of water.” The City does not have any current or planned water exchanges.

6.2.7.2 TRANSFERS
Pursuant to DWR’s 2025 Final Guidebook, “The Water Code defines a water transfer as a temporary or long-term change in the point of diversion, place of use, or purpose of use due to a transfer, sale, lease, or exchange of water or water rights.” Pursuant to the Central Basin Judgment (discussed in Section 6.2), parties to the Judgments are allowed to assign, transfer, license, or lease their water rights. The Judgment also allows for the transfer of stored water between parties. The City is able to utilize the transfer opportunities available for Central Basin water when necessary.

6.2.7.3 EMERGENCY INTERTIES
Emergency interties (or interconnections) are distribution system interconnections between water agencies for use during critical situations where one system or the other is temporarily unable to provide sufficient potable water to meet its water demands and/or fire protection needs. An emergency interconnection will allow a water system to continue serving water during critical situations such as local water supply shortages as a result of earthquakes, fires, prolonged power outages, and droughts.

The City does not maintain any active interconnections with adjacent water systems.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-27

6.2.8 SUPPLY FROM STORAGE
Section 6.2.8 is not applicable. The City does not remove water from either surface storage or underground storage for use (including surface water placed into storage in a given year and retrieved in the following year).

6.2.9 OTHER
The City does not rely on any additional water supply sources.

6.2.10 FUTURE WATER PROJECTS
CWC 10631.
(f) Include a description of all water supply projects and water supply programs that may be undertaken by the urban water supplier to meet the total projected water use, as established pursuant to subdivision (a) of Section 10635. The urban water supplier shall include a detailed description of expected future projects and programs that the urban water supplier may implement to increase the amount of the water supply available to the urban water supplier in normal and single-dry water years and for a period of drought lasting five consecutive water years. The description shall identify specific projects and include a description of the increase in water supply that is expected to be available from each project. The description shall include an estimate with regard to the implementation timeline for each project or program.

The City produces groundwater from the Central Basin to provide sufficient water service now, and in the future. The City plans to construct a new groundwater well between 2030 and 2031. The City will also construct new groundwater production wells to replace existing wells when necessary (See Table 6-7).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-28

ENERGY USE
CWC 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. “Energy intensity” is defined as the quantity of energy consumed, measured in kilowatt hours (kWh), divided by the volume of water, measured in AF for a water management process over a one-year period. The information used to calculate the estimated energy intensity associated with the City’s water system is provided below. The energy intensity information is based on readily obtainable energy and water use data for the following water management processes: 1) extraction or diversion of water supplies; 2) placement into storage; 3) conveyance to distribution; 4) treatment; and 5) water system distribution.

The City has tabulated its energy intensity using readily obtainable energy consumption data obtained from monthly electricity bills from Southern California Edison (SCE) for the whole water system and the corresponding water use data obtained from available water meter readings. The City has reported the energy intensity associated with the water management processes which occur within its operational control. Because the City does Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-29
not track individual energy usage for each water management process identified above, the City has estimated the energy intensity using the “total utility approach” (i.e. sum of all water management processes). The total energy consumed was approximately 3,875,623 kWh during CY 2025. Although the total energy consumption reported includes electricity usage for general administration (e.g. at the City’s headquarters) which is not associated with any water management processes, the general administration energy usage is considered negligible compared to overall water system use and has not been netted out.

The total volume of water entering the potable water system was approximately 4,471 AF during CY 2025 and is consistent with the total volume of water provided in Table 4-1 (less recycled water supplies).

The total energy intensity associated with the City’s water management processes is estimated at 2,660 kWh per million gallons. The energy intensity data and calculations based on the “total utility approach” are provided in Table O-1B below.

The City’s water management processes do not include “consequential hydropower generation” where the energy generation is a direct consequence of water delivery (i.e. all water passing through the energy generation devices is delivered to users). The City’s water management processes do not include “non-consequential hydropower generation” where the energy generation is not a direct consequence of water delivery (i.e. energy could be generated even if no water was being delivered to water users). In addition, the City’s water management processes do not include any substantial “self-generated energy sources” including solar, wind, geothermal, biomass, co-generation, and diesel generator sources.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-30
Table O-1B. Recommended Energy Reporting — Total Utility Approach

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
4,471 4,471
3,875,623 3,875,623
- 2,660 2,660
Quantity of Self-Generated Renewable Energy
0 kWh
Data Quality (Estimate, Metered Data, Combination of Estimates and Metered Data) Combination of Estimates and Metered Data
Data Quality Narrative:

Narrative:

Optional Submittal Table O-1B: Recommended Energy Reporting - SINGLE DELIVERY PRODUCT - TOTAL UTILITY

APPROACH
The total energy consumed was identified based on Southern California Edison (SCE) billing records. Although the total energy consumed includes electricity usage for general administration (which is not an identified water management process), general administration energy use is considered to be negligible compared to overall water system use and has not been netted out.

Only for Water Delivery Products Under the Urban Water Supplier's Operational Control
Sum of All Water
Management Processes Non-Consequential Hydropower
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.

NOTES:

The total energy consumption includes energy associated with operating groundwater production wells and booster pumps to deliver water in the distribution system. Energy consumption is associated with operating groundwater water treatment. Energy consumption is also associated with plant lighting and air conditioning, and operating the Supervisory Control and Data Acquisition (SCADA) system and chlorination injection pumps.

Volume of Water Entering Process
Energy Consumed (kWh)
Energy Intensity (kWh/vol. converted to MG)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-31

SUBMITTAL TABLES
The applicable standardized Submittal Tables referenced within Chapter 6 are provided below.

6.4.1 TABLE 6-1: GROUNDWATER VOLUME PUMPED
Table 6-1 Groundwater Volume Pumped

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-32

6.4.2 TABLE 6-2: WASTEWATER COLLECTED WITHIN SERVICE AREA Table 6-2 Wastewater Collected Within UWMP Service Area

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-33

6.4.3 TABLE 6-3: WASTEWATER TREATMENT AND OUTCOMES WITHIN UWMP SERVICE AREA IN 2025
Table 6-3 Wastewater Treatment and Outcome within Service Area in 2020

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-34

6.4.4 TABLE 6-4: RECYCLED WATER DIRECT BENEFICIAL USES WITHIN

SERVICE AREA
Table 6-4 Current and Projected Recycled Water Direct Beneficial Uses Within Service Area

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-35

6.4.5 TABLE 6-5: 2020 UWMP RECYCLED WATER-USE PROJECTION COMPARED TO 2025 ACTUAL
Table 6-5 2020 UWMP Recycled Water Use Projection Compared to 2025 Actual

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-36

6.4.6 TABLE 6-6: METHODS TO ENCOURAGE FUTURE RECYCLED

WATER USE
Table 6-6 Methods to Encourage Future Recycled Water Use

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-37

6.4.7 TABLE 6-7: EXPECTED FUTURE WATER SUPPLY PROJECTS OR

PROGRAMS
Table 6-7 Expected Future Water Supply Projects or Programs

6.4.8 TABLE 6-8: WATER SUPPLIES—ACTUAL
As discussed in Section 6.2, the City’s water supply sources consist of treated imported water purchased from MWD through CBMWD (see Section 6.2.1), groundwater from the Central Basin (see Section 6.2.2), and recycled water (see Section 6.2.5). The actual quantities of the water supply sources available to the City during CY 2025 are summarized in Table 6-8. The reliable quantities of projected water supply sources available to the City in five-year increments through CY 2050 during normal or average years are summarized in Table 6-9. The reliability of these sources of supply are Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-38
addressed in Section 7.2.3, including during normal years, single dry years, and five consecutive year droughts.

The order of use of the City’s projected reliable water supplies from CY 2025 through CY 2050 in five-year increments is based on historical practices, water supply availability, and the cost of water. It is anticipated the City will initially use groundwater produced from the Central Basin. At the same time, the City will continue to use recycled water for nonpotable demands. The City will also use treated imported water if necessary. It is important to note that although the Central Basin is adjudicated (as discussed in Section

6.2.2), there is a limit to the amount of groundwater which can be produced annually as water rights are fixed and do not vary year to year.

The City’s projected quantities of treated imported water supplies are based on historical long-term averages and available supplies during previous dry year conditions. The City’s projected quantities of recycled water supplies to meet non-potable demands are based on historical long-term averages. The City’s projected quantities of groundwater supplies from Central Basin are based on meeting the remainder of the City’s total water demands.

It is anticipated the City will have sufficient water supplies available to meet projected demands.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-39
Table 6-8 Water Supplies – Actual

6.4.9 OPTIONAL TABLE 6-8DS: SOURCE DESALINATION BY SUPPLIER As discussed in Section 6.2.6, the City is currently not considering the development of a desalinated water project. As a result, optional Table 6-8DS is not included.

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
(AF)
Total Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Groundwater (not desalinated) Central Basin Potable 4,471 Purchased or Imported Water CBMWD Potable 0
Recycled Water LACSD Non-Potable 408
4,471 0
408 0
4,879 0
Submittal Table 6-8 Retail: Water Supplies — Actual
Water Code Section 10631(b)
2025
NOTES:

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.

Add additional rows as needed
Total
Subtotal Potable
Subtotal Non-Potable
Additional Description
(as needed)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 6-40

6.4.10 TABLE 6-9: WATER SUPPLIES—PROJECTED
Table 6-9 Water Supplies – Projected
Water Supply
Reasonably
Available
Volume
(AF)
Total
Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Reasonably
Available
Volume (AF)
Total
Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Reasonably
Available
Volume
(AF)
Total
Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Reasonably
Available
Volume (AF)
Total
Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Reasonably
Available
Volume (AF)
Total
Entitlement
(OPTIONAL)
See 'DWR Notes'
below (AF)
Groundwater (not
desalinated)
Central
Basin Potable 6,727 7,064 7,064 7,065 7,066
Purchased or Imported
Water CBMWD Potable 325 325 325 325 325
Recycled Water LACSD Non-Potable 500 500 500 500 500
7,052 0 7,389 0 7,389 0 7,390 0 7,391 0
500 0 500 0 500 0 500 0 500 0
7,552 0 7,889 0 7,889 0 7,890 0 7,891 0
Submittal Table 6-9 Retail: Water Supplies — Projected
Water Code Section 10631 (b)
Projected Water Supply (Report to the Extent Practicable) Drop down list
May use each category
multiple times . These are the
only water s upply categories
that will be recognized by the
WUEda ta online s ubmittal
tool
Additional
Detail on
Water
Supply
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop Down list
2050 (opt)
Add additional rows as needed
Total
NOTES:
2030 2035 2040 2045
Subtotal Non-Potable
Subtotal Potable
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.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-1
CHAPTER 7

WATER SERVICE RELIABILITY AND DROUGHT RISK ASSESSMENT
LAY DESCRIPTION – CHAPTER 7

WATER SERVICE RELIABILITY AND DROUGHT RISK ASSESSMENT
Chapter 7 (Water Service Reliability and Drought Risk Assessment) of the City’s 2025 Plan discusses and provides the following:
 Calendar Year 2020 represents an “average” or “normal” water year for the City in which the total amount of rainfall was similar to the historical average rainfall.  A “single dry” year for the City was represented in Calendar Year 2017, in which the total amount of rainfall was below the historical average rainfall.  A “five consecutive year drought” period for the City is represented from Calendar Year 2011 to Calendar Year 2015, where the total amount of rainfall during each of these years was less than the historical average rainfall.  The City’s current and projected water supplies available during normal years in five-year increments over the next 25 years are provided (through Calendar Year 2050) as shown on Table 7-2.
 The City’s current and projected water supplies available during single dry years in five-year increments over the next 25 years are provided (through Calendar Year 2050) as shown on Table 7-3.
 The City’s current and projected water supplies available during each year of a five consecutive year drought in five-year increments over the next 25 years are provided (through Calendar Year 2050) as shown on Table 7-4.  The reliability of the City’s water supply sources, including a review of water supply constraints, is provided. A single dry year or a five consecutive year drought period Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-2
will not compromise the City’s ability to provide a reliable supply of water to its customers.
 A Drought Risk Assessment (or DRA) is provided which includes an assessment of the City’s water supply reliability over a five consecutive year drought period.

The City’s DRA assumes a five consecutive year drought from Calendar Year 2026 through Calendar Year 2030 and includes a review of water supplies, water uses, and water supply reliability for each water supply source during this period. The City’s water system has experienced a prior five consecutive year drought with no limitation to its collective water supplies. However, the cost of those water supplies may have increased based on the mix of water supplies which are used.

Consequently, the City has the ability to enact varying water shortage levels (see Chapter 8) to help educate its customers and provide an economic incentive for the retail customers to reduce their water consumption.

This section of the City’s Plan describes the City’s ability to meet retail customer water demands by analyzing a variety of factors which affect the City’s water supply. This section assesses the City’s water service reliability during average years, single dry years, and during a five consecutive year drought period to meet the water needs of its customers. This section also includes the discussion of a Drought Risk Assessment which provides a mechanism for the City to evaluate the risk to its water supply under a drought lasting for the next five consecutive years.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-3

CONSTRAINTS ON WATER SOURCES CONSIDERATIONS

7.1.1 SERVICE RELIABILITY – CONSTRAINTS ON WATER

SOURCES
CWC 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.

The City’s sources of supplies consist of imported water purchased from MWD through CBMWD, groundwater from the Central Basin, and recycled water as described in Section

6.2. Although all of these supplies are managed, the following constraints may occur which the City has considered in this reliability analysis.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-4
Imported Water
The City receives treated surface water from MWD through CBMWD. Water quality from MWD relating to supply reliability is addressed separately in MWD’s 2025 Regional Urban Water Management Plan.

Central Basin
The City produces groundwater from the Central Basin. The groundwater has been impacted by contamination, including by iron and manganese. However, the City has been reviewing appropriate treatment (blending and/or treatment facilities).

WATER SERIVCE RELIABILITY ASSESSMENT
CWC 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.

Information regarding the reliability of the City’s water supplies is based on the historical precipitation data in the Central Basin area. Historical annual precipitation in the Central Basin area is discussed in Section 3.3 and is based on historical data collected from Station 049660 (Whittier City Yard, California). Furthermore, Section 4.2.5.6 of this Plan notes that potential future climate change impacts may result in an increase in the average annual precipitation within the City’s service area, thus indicating use of historical Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-5
data is a reasonable and conservative approach. As indicated in Section 3.3, the historical average rainfall in the vicinity of the City’s service area is 14.5 inches. CY 2020 represents an average or normal water year for the City in which the total amount of rainfall was similar to the historical average rainfall. A single dry year for the City was represented in CY 2017, in which the total amount of rainfall was below the historical average rainfall. A five consecutive year drought period for the City is represented from CY 2011 to CY 2015, where the total amount of rainfall during each of these years was less than the historical average rainfall. Table 7-1 summarizes these “base years” for average, single dry, and five consecutive year drought and provides the total amount of water supplies available to the City during those base years. The following discussion assesses the water service reliability of the City’s water supply sources.

Water Service Reliability - Imported Water
The City’s treated imported water supplies from MWD, through CBMWD, may be impacted during a multi-year drought or other conditions which limits MWD from delivering sufficient water supplies to all of its member agencies, and consequently to the City. In anticipation of such a reduction in supplies, MWD developed a WSAP as discussed in Section 6.2.1. The WSAP provides a means of equitably providing reduced water supplies to each of MWD’s member agencies for up to 10 levels of reduction representing up to a 50 percent reduction.

Water Service Reliability - Groundwater

Central Basin Groundwater Production
The Central Basin groundwater supplies are managed by the Central Basin Watermaster (WRD), as discussed in Section 6.2.2. During a normal year (CY 2020), the City met about 82 percent of its total demands with supplies from the Central Basin. During a single Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-6
dry year (CY 2017), the City met about 85 percent of its total demands with supplies from the Central Basin. During a five consecutive year drought multiple dry year period (CY 2011 to CY 2015), the City met between 79 and 84 percent of its total demands with supplies from the Central Basin.

Water Service Reliability Summary
Table 7-1 shows the water supplies during the base years (for average year, single dry year and a five consecutive year drought). As a result of the City’s diverse water supply portfolio, water supplies may be re-apportioned during a five consecutive year drought to meet the City’s water demands.

7.2.1 WSRA YEAR-TYPE CHARACTERIZATION

7.2.1.1 TYPES OF YEARS
The City’s base years for an average year, a single dry year, and a five consecutive year drought are discussed in Section 7.2 and are summarized in Table 7-1. As indicated in Chapter 6, the City’s water supplies sources have been sufficient in meeting the City’s historical water demands during an average year, a single dry year, and a five consecutive year drought. An average year was based on a historical year during the past 15 years with a total precipitation similar to the historical average precipitation in the vicinity of the City’s service area. Because a single dry year or a five consecutive year drought period will not compromise the City’s ability to provide a reliable supply of water to its customers, a single dry year in this Plan was selected based on one of the driest years during the past 15 years. The five consecutive year drought period was based on a period of five consecutive dry years during the past 15 years.

As indicated in Section 3.3, the historical average rainfall in the vicinity of the City’s service area is 14.5 inches. CY 2017 represents an average or normal water year for the City in Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-7
which the total amount of rainfall was similar to the historical average rainfall. A single dry year for the City was represented in CY 2017, in which the total amount of rainfall was less than the historical average rainfall. A five consecutive year drought period for the City is represented from CY 2011 to CY 2015, where the total amount of rainfall during each of these years was less than the historical average rainfall. Table 7-1 summarizes these “base years” for an average year, a single dry year and a five consecutive year drought period and provides the total amount of water supplies available to the City during those base years.

7.2.1.2 SOURCES FOR WATER DATA
The monthly historical average temperatures (including minimum and maximum), monthly historical average rainfall, and monthly ETo in the vicinity of the City’s service area are discussed in Section 3.3. Historical climate information was obtained from the WRCC, DPW, and from DWR’s CIMIS.

7.2.2 WSRA SUPPLY AND DEMAND COMPARISON
CWC 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 City primarily obtains its water supplies from groundwater wells located in the Central Basin. As discussed in Section 7.3 and shown in Table 7-2, Table 7-3, and Table 7-4, each of the City’s water supply sources share the same base years. As previously Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-8
discussed in Section 7.2.1, a single dry year or a five consecutive year drought period will not compromise the City’s ability to provide a reliable supply of water to its customers.

The City’s projected normal year water demands over the next 25 years are discussed in Section 4.2.6. The ratio of total water supplies (including potable and recycled water supplies) available to the City during a historical average year in CY 2020 (or 7,494 AF) and during a historical single dry year in CY 2017 (or 7,744 AF) was used to estimate the City’s projected water demands during single dry years. The ratio of water supplies available to the City during a historical average year in CY 2020 (or 7,494 AF) and a historical a five consecutive year drought period from CY 2011 to CY 2015 (or 8,705 AF, 8,672 AF, 8,756 AF, 8,395 AF, and 8,217 AF, respectively) was used to estimate the City’s projected water demands during a five consecutive year drought period. The City’s projected dry year water supplies over the next 25 years were based on the minimum supplies needed by the City to meet projected single-dry year demands. Table 7-2, Table 7-3, and Table 7-4 summarize the City’s projected water demands and supplies over the next 25 years in five-year increments, including during normal years, single dry years, and a five consecutive year drought periods. These tables indicate the City can meet water demands during normal years, single dry years, and a five consecutive year drought periods over the next 25 years.

7.2.2.1 NORMAL YEAR
Table 7-2 summarizes the City’s projected water demands and supplies over the next 25 years in five-year increments during normal years. Table 7-2 indicates the City can meet water demands during normal years over the next 25 years.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-9

7.2.2.2 WATER SERVICE RELIABILITY – SINGLE DRY YEAR
Table 7-3 summarizes the City’s projected water demands and supplies over the next 25 years in five-year increments during single dry years. Table 7-3 indicates the City can meet water demands during single dry years over the next 25 years.

7.2.2.3 FIVE CONSECUTIVE DRY YEARS
Table 7-4 summarizes the City’s projected water demands and supplies over the next 25 years in five-year increments during five consecutive year drought periods. Table 7-4 indicates the City can meet water demands during five consecutive year drought periods over the next 25 years.

7.2.3 WSRA DESCRIPTION OF MANAGEMENT TOOLS AND

OPTIONS
CWC 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.

As noted in Section 6.2.2, the Central Basin is managed by the WRD. During the period of management under the Judgment, significant drought events have occurred. In each drought cycle the Central Basin has been managed to maintain water levels. Therefore, based on historical and on-going management practices, the City will be able to rely on the Central Basin for adequate supply over the next 25 years under single dry years and a five consecutive year drought periods.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-10
Section 6.2.2 provides a description of the management of groundwater resources in the Central Basin, as well as information on basin management. Chapter 6 also demonstrates the management structure of the Central Basin provides a reliable source of groundwater supply for the City during a normal year, a single-dry year and a five consecutive year drought. Historical data indicates the Central Basin has been well managed for the full period of the adjudication, resulting in a stable and reliable water supply. Basin management changes are discussed in Section 6.2.2 and include increased direct use of recycled water (see Section 6.2.5) and the planned use of treated recycled water for groundwater replenishment in the Central Basin to reduce the need to import water from other regions. Therefore, the groundwater supplies in the Central Basin are deemed reliable.

DROUGHT RISK ASSESSMENT
CWC 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 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.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-11
(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.

The City’s source of supplies consist of groundwater from the Central Basin (which is managed by the Central Basin Watermaster), treated imported water purchased through CBMWD and managed by the Metropolitan Water District of Southern California, and recycled water. The following discussion provides a Drought Risk Assessment which assesses the City’s water supply reliability over a five consecutive year drought period.

The City’s DRA incorporates a five consecutive year drought from CY 2026 through CY 2030 and includes a review of water supplies, water uses, and water supply reliability.

7.3.1 DRA, DATA, METHODS, AND BASIS FOR WATER SHORTAGE

CONDITIONS
The City’s DRA was prepared using historical production data from the City’s water supply sources. The following assumptions were considered during the preparation of the City’s DRA for each year of the five consecutive year drought.  The five consecutive year drought period associated with the 2025 Plan is based on five consecutive dry years from CY 2026 through CY 2030.  The projected water supplies available during each year of this five consecutive year drought are assumed to be identical to the water supplies produced during each year between CY 2011 to CY 2015 (which represents the most recent and historical five consecutive year drought).

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-12
 The projected demands during this five consecutive year drought are based on water demands from CY 2020 (a normal year) which were adjusted based on projected population over the next five years along with the ratio of the normal year demands to actual demands over each year of the most recent and historical five consecutive year drought period (from CY 2011 to CY 2015).  The projected demands were compared to the projected supplies to identify potential water supply deficits which may require implementation of the Water Shortage Contingency Plan (discussed further in Chapter 8).

The following methodologies were considered during the preparation of the City’s DRA during for each year of the five consecutive year drought:
 Drought Year 1: The region had experienced an average to above average year of precipitation in the prior year. Water use in the prior year had been below average due to a reduce need for outdoor water use, the groundwater basin had been replenished from above average local stormwater runoff, and imported water supplies were not restricted.
 Drought Year 2: The region experienced a second year of below average precipitation and runoff. Retail customers increase water use for outdoor irrigation to compensate for lack of precipitation. Groundwater and imported water supplies have not been impacted.
 Drought Year 3: The region experienced a third year of below average precipitation and runoff. Retail customers increase water use for outdoor irrigation to compensate for lack of precipitation. Groundwater and imported water supplies have not been impacted. However, there is an increased demand on both groundwater and treated imported water.
 Drought Year 4: The region experienced a fourth year of below average precipitation and runoff. Groundwater supplies have not been impacted. However, there is an increased demand on groundwater.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-13
 Drought Year 5: Fifth year of below average precipitation and runoff. Groundwater supplies have not been impacted. However, there is an increased demand on groundwater.

7.3.2 DRA INDIVIDUAL WATER SOURCE RELIABILITY
The City’s DRA incorporates a five consecutive year drought based on five consecutive dry years commencing in CY 2026. The quantity of water supplies available for each year during this five consecutive year drought period included in the City’s DRA is assumed to be the same as the quantity of water supplies produced by the City (i.e. demands) during the most recent and historical five consecutive year drought which occurred from CY 2011 to CY 2015. Production data for those years have been tabulated in Section 6.1. The following describes the anticipated reliability of each water source for each year of the five consecutive year drought based on recent experience.

Groundwater
The City produces groundwater supplies from the Central Basin which is actively managed by the Central Basin Watermaster, as described in Section 6.2. The Central Basin is adjudicated; however, the water rights are fixed each year. Consequently, a Central Basin producer cannot produce in excess of its own water rights or rights it may have leased from others. The City also has access to water supplies from treated imported water and recycled water. The quantity of groundwater used (and reliably available) during the most recent and historical five consecutive year drought period have been tabulated in Section 6.1. The City manages its water supply portfolio to optimize the water supplies available each year and to avoid a water supply shortage. The City also had the ability to systematically implement aspects of its Water Shortage Contingency Plan (see Chapter 8). As a result of these collective actions (and experience during prior consecutive five-year droughts), the City does not anticipate a water supply shortage.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-14
Imported Water
The City can obtain imported water from the Metropolitan Water District of Southern California through CBMWD. Section 6.2.1 describes the planning conducted by the Metropolitan Water District of Southern California regarding treated imported water supplies available to the City. The reliability of MWD’s supplies is also discussed in its 2025 Regional UWMP and is incorporated by reference. The City purchases treated imported water which is delivered directly within its distribution system. The City’s purchases of treated, imported water over the past 15 years have been tabulated in Section 6.1. In the event of a drought which limits imported water supplies, the City will rely on its groundwater production.

The imported water purchases by the City during the most recent and historical five consecutive year drought period have been tabulated in Section 6.1. Because the City’s DRA assumes the most recent and historical five consecutive year drought scenario will be repeated over the next five years, it is assumed the quantity of treated imported water supplies purchased during the most recent and historical five consecutive year drought scenario will be available. Furthermore, this constitutes the minimum amount of treated imported water which may be available in a future five consecutive year drought absent MWD’s programs which it has since implemented.

Recycled Water
The City has a recycled water distribution system which it has developed to reduce demands on its potable water supplies as described in Section 6.2.5. The availability of recycled water supplies is not adversely impacted by drought conditions and are locally available.

The quantity of recycled water used during the most recent and historical five consecutive year drought period have been tabulated in Section 6.1. The quantity of recycled water Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-15
available during each year of the most recent and historical five consecutive year drought is expected to be available during a future five consecutive year drought.

Summary
The City’s water system has experienced a prior five consecutive year drought with no limitation to its collective water supplies. However, the cost of those water supplies may have increased based on the mix of supplies which are used. Consequently, the City has the ability to enact varying Demand Management Measures (see Chapter 9) to help educate its customers and provide an economic incentive for the retail customers to reduce their water consumption.

7.3.3 DRA TOTAL WATER SUPPLY AND USE COMPARISON
Gross water use for the projected five consecutive year drought is shown on Table 7-5.

Section 7.3.2 describes the water source reliability for each source of supply the City will rely on during a five consecutive year drought. The annual quantities are summed and are also provided on Table 7-5. When necessary, the City can implement various water shortage levels of its Water Shortage Contingency Plan (as discussed in Chapter 8) in order to reduce its water demands. As shown in Table 7-5, assuming no additional water supply benefits will be available from groundwater supplies, the City can implement various stages of its Water Shortage Contingency Plan to balance water demands with available supplies during each year of the projected five consecutive year drought.

OPTIONAL PLANNING TOOL WORKBOOK
DWR has deemed the “Planning Tool Worksheet” as optional and the City is not required by DWR to use the tool. The City has provided sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands. The City has also been able to provide water service to meet maximum day water demands Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-16
for these years, including during the summer months. The City obtains the majority of its water supplies from a managed groundwater basin which is not subject to seasonal fluctuation. Consequently, an evaluation regarding water supplies on a monthly basis was not considered.

SUBMITTAL TABLES
The applicable standardized Submittal Tables referenced within Chapter 7 are provided below.

7.4.1 OPTIONAL TABLE 7-1: BASIS OF WATER-YEAR DATA (WSRA) Table 7-1 Basis of Water-Year Data (Reliability Assessment) Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-17

7.4.2 TABLE 7-2: NORMAL-YEAR SUPPLY AND USE COMPARISON
Table 7-2 Normal-Year Supply and Use Comparison

2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF)
Supply totals
(autofill from Submittal
Table 6-9 R)
7,552 7,889 7,889 7,890 7,891
Use totals
(autofill from Submittal
Table 4-2 R)
7,552 7,889 7,889 7,890 7,891
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply
augmentation benefit
WSCP - use reduction
savings benefit
Revised Surplus/(shortfall)
OPTIONAL Planned WSCP Actions
Submittal Table 7-2 Retail: Normal Year Supply and Use Comparison Water Code Section 10635 (a)
NOTES:

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

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-18

7.4.3 TABLE 7-3: SINGLE-DRY-YEAR SUPPLY AND USE COMPARISON Table 7-3 Single-Dry-Year Supply and Use Comparison

Supply totals 7,805 8,153 8,153 8,154 8,155
Use totals 7,805 8,153 8,153 8,154 8,155
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply
augmentation benefit
WSCP - use reduction
savings benefit
Revised
Surplus/(shortfall)
2050 (AF)
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

NOTES
Submittal Table 7-3 Retail: Single Dry Year Supply and Use Comparison Water Code Section 10635(a)
OPTIONAL Planned WSCP Actions
2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-19

7.4.4 TABLE 7-4: MULTIPLE DRY YEARS SUPPLY AND USE COMPARISON Table 7-4 Multiple Dry Years Supply and Use Comparison
2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF)
Supply totals 8,773 9,164 9,165 9,165 9,166
Use totals 8,773 9,164 9,165 9,165 9,166
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 8,740 9,129 9,130 9,131 9,132
Use totals 8,740 9,129 9,130 9,131 9,132
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 8,824 9,217 9,218 9,219 9,220
Use totals 8,824 9,217 9,218 9,219 9,220
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 8,460 8,837 8,838 8,839 8,840
Use totals 8,460 8,837 8,838 8,839 8,840
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 8,281 8,650 8,651 8,652 8,652
Use totals 8,281 8,650 8,651 8,652 8,652
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Submittal Table 7-4 Retail: Multiple Dry Years Supply and Use Comparison Water Code Section 10635(a)
OPTIONAL Planned WSCP Actions
Third year
Fifth year
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.

OPTIONAL Planned WSCP Actions
OPTIONAL Planned WSCP Actions
Fourth year OPTIONAL Planned WSCP Actions
NOTES:

First year
Second year OPTIONAL WSCP Actions
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 7-20

7.4.5 TABLE 7-5: FIVE-YEAR DROUGHT RISK ASSESSMENT
Table 7-5 Five-Year Drought Risk Assessment
2026 Total
Total Water Use (AF) 6,289
Total Supplies (AF) 8,705
Surplus/Shortfall w/o WSCP Action 2,416
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2027 Total
Total Water Use (AF) 6,884
Total Supplies (AF) 8,672
Surplus/Shortfall w/o WSCP Action 1,788
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2028 Total
Total Water Use (AF) 7,575
Total Supplies (AF) 8,756
Surplus/Shortfall w/o WSCP Action 1,181
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2029 Total
Total Water Use (AF) 7,862
Total Supplies (AF) 8,395
Surplus/Shortfall w/o WSCP Action 533
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2030 Total
Total Water Use (AF) 8,281
Total Supplies (AF) 8,217
Surplus/Shortfall w/o WSCP Action (64)
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF) 64
Revised Surplus/(shortfall) 0
NOTES:

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

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)
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-1
CHAPTER 8

WATER SHORTAGE CONTINGENCY PLAN
LAY DESCRIPTION – CHAPTER 8

WATER SHORTAGE CONTINGENCY PLAN
Chapter 8 (Water Shortage Contingency Plan) of the City’s 2025 Plan discusses and provides the following:
 The City’s Water Shortage Contingency Plan is a detailed approach which presents how the City intends to act, or respond, in the case of an actual water shortage contingency.
 Preparation of the City’s “Annual Water Supply and Demand Assessment” (or Annual Assessment) is discussed. The City is required to submit annually an Annual Assessment. The Annual Assessment includes a review of the City’s “unconstrained” water demands for the current year and for a potential upcoming single dry year. Unconstrained water demands represent the City’s water demands prior to any “response actions” the City may invoke pursuant to the City’s Water Shortage Contingency Plan.
 The City will manage water supplies to minimize the adverse impacts of water shortages. The City’s plan for water usage during periods of shortage is designed to incorporate six standard water shortage levels corresponding to progressive ranges from up to a 10, 20, 30, 40, and 50 percent shortage, and greater than a 50 percent shortage.
 For each declared water supply shortage level, customers will be required to reduce their consumption by the percentage specified in the corresponding water supply shortage level.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-2
 For each declared water supply shortage level, the City has established response actions to reduce demand on water supplies and to reduce any shortage gaps in water supplies. These demand reduction actions include irrigation and other outdoor use restrictions, rate structure changes, and other water use prohibitions.  The operational changes the City will consider in addressing water shortages on a short-term basis are discussed and include improved monitoring, analysis, and tracking of customer water usage to enforce demand reduction measures.  The City’s Emergency Response Plan is summarized. The Emergency Response Plan provides the management, procedures, and designated actions the City and its employees will implement during emergency situations (including catastrophic water shortages) resulting from natural disasters, system failures, and other unforeseen circumstances.
 The preparation of the City’s seismic risk assessment and mitigation plan is discussed. The locations of earthquake faults in the vicinity of the City’s water service area are provided.
 The effectiveness of the shortage response actions for each of the City’s standard water shortage levels is presented. The City has been able to provide sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands.
 The communication protocols implemented by the City when it declares any water shortage level are presented.
 The compliance and enforcement procedures associated with City’s standard water shortage levels are presented.
 The legal authorities associated with City’s standard water shortage levels are presented.
 The financial consequences associated with City’s standard water shortage levels are presented.
 The City will evaluate the need for revising the Water Shortage Contingency Plan in order to resolve any water shortage gaps, as necessary. The steps necessary Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-3
for the City to adopt and amend its Water Shortage Contingency Plan are presented.

The following Water Shortage Contingency Plan includes references to Chapters and Sections from the City of Vernon’s 2025 Urban Water Management Plan:

WATER SUPPLY RELIABILITY ANALYSIS
CWC 10632.
(a)(1) The analysis of water supply reliability conducted pursuant to Section 10635.

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

The City’s sources of supply were discussed in Section 6.2 of the 2025 Plan and consist of groundwater produced from the Central Basin, treated imported water purchased from MWD through CBMWD, and recycled water supplies. The reliability of the various sources of supply are discussed in Chapter 7 of the 2025 Plan. Imported water supplies (treated) may be impacted in the event MWD implements its WSAP due to a water supply shortage.

Finally, recycled water is locally generated and is not impacted by drought conditions. A seismic risk assessment and mitigation plan is discussed in Section 8.4.6.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-4

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

CWC 10632.1.

An urban water supplier shall conduct an annual water supply and demand assessment pursuant to subdivision (a) of Section 10632 and, on or before 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.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-5
By July 1st of every year, the City is required to submit an “Annual Water Supply and Demand Assessment” (Annual Assessment) in accordance with DWR’s guidance and requirements. The Annual Assessment includes a review of the City’s unconstrained water demands (i.e. water demands prior to any projected response actions the City may trigger under this Water Shortage Contingency Plan) for the current year and the upcoming (potential single dry) year. The Annual Assessment also includes also include information regarding anticipated shortages, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the City’s Water Shortage Contingency Plan.

During the preparation of each Annual Assessment, the City will evaluate the adequacy of its water supplies for the current and upcoming years. The evaluation will include a review of water supplies for at least a single dry year.

8.2.1 DECISION-MAKING PROCESS
The City produces groundwater supplies from the Central Basin as its primary source of water supply. Consequently, during the third quarter of each fiscal year the City will review its water demands from the initial six months along with the current groundwater basin conditions and local hydrology. This information will be used to help develop the Annual Assessment. A draft of the Annual Assessment will be circulated internally within the City for peer review and comment. Based on comments received, a redraft will be prepared and provided to City managers during the Spring of each year. The draft will subsequently be provided to the General Manager for final review. If necessary, a final draft of the Annual Assessment will be provided to the City Council for review and included in the agenda as part of a City meeting such that it can be approved and any recommended specific shortage response actions may be enacted. The final Annual Assessment will be provided to DWR no later than July 1 of each year.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-6
The Annual Assessments will be instrumental in providing guidance to the City for decisions regarding potential declarations of a water supply shortage and implementation of water reduction stages, instituting mandatory water restrictions, promoting water use efficiency and conservation programs, water rates and drought rate surcharges, and the necessity of pursuing alternative water supplies. This process will help ensure adequate water supplies resources are available to the City.

8.2.2 DATA METHODOLOGIES
The key data inputs and methodologies which will be evaluated by the City during the preparation of the Annual Assessment will include the following:
1) Evaluation Criteria: The locally applicable evaluation criteria used to prepare the Annual Assessment will be identified. The evaluation criteria will include, but is not limited to, an analysis of current local hydrology (including rainfall and groundwater levels), current water demands, a review of water system improvement plans which may impact infrastructure availability, and water quality regulations which may impact groundwater availability.
2) Water Supply: A description of each available water supply source will be provided.

The descriptions will include a quantification of each available water supply source and will be based on review of current production capacities, historical production, Urban Water Management Plans, and prior water supply studies (including Water Supply Assessments and/or Master Plans).
3) Unconstrained Water Demand: The potential unconstrained water demands during the current year and the upcoming (potential single dry) year will be reviewed. The review will include factors such as weather, existing and projected land uses and populations, actual customer consumption and water use factors, monthly Urban Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-7
Water Supplier Monthly Reports, existing water shortage levels (see Section 8.3), and existing water conservation ordinances (see Section 9.1). 4) Planned Water Use for Current Year Considering Dry Subsequent Year: The water supplies available to meet the demands during the current year and the upcoming (potential single dry) year will be considered and identified by each type of supply.

The evaluation will include factors such as estimated water demands, weather, groundwater basin operating safe yields, water quality results, existing available pumping capacities, imported water allocations, contractual obligations, regulatory issues, use of emergency interconnections, and the costs associated with producing each water supply source.
5) Infrastructure Considerations: The capabilities of the water distribution system infrastructure to meet the water demands during the current year and the upcoming (potential single dry) year will be considered. Available production capacities (e.g. groundwater well capacities) and distribution system water losses (see Section

4.3) will be reviewed. In addition, capital improvement and replacement projects, as well as potential projects which may increase water system and production capacities (see Section 6.2.10), will be considered.

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

Shortage levels shall also apply to catastrophic interruption of water supplies, including, Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-8
but not limited to, a regional power outage, an earthquake, and other potential emergency events.
(a)(3)(B) An urban water supplier with an existing water shortage contingency plan that uses different water shortage levels may comply with the requirement in subparagraph (A) by developing and including a cross-reference relating its existing categories to the six standard water shortage levels.

The City will manage water supplies prudently to minimize the adverse impacts of water shortages. The City’s plan for water usage during periods of shortage is designed to incorporate six standard water shortage levels corresponding to progressive ranges from up to 10, 20, 30, 40, and 50 percent shortages and greater than a 50 percent shortage.

The City previously adopted Ordinance No. 995 in 1991 (Appendix H), which enacted the Water Conservation Chapter of the City’s Municipal Code to protect the water supplies and to establish standards for reductions in the use of water. The Water Conservation Chapter code was further amended in 2006 through the adoption of City Ordinance No. 1115 (Appendix I) and in October 2009 through the adoption of Ordinance No. 1161 (Appendix J). The current Water Conservation Chapter from the City’s Municipal Code is provided in Appendix K. The City’s Ordinances previously established three (3) water shortage levels. In accordance with the California Water Code in which urban water suppliers are required to define six standard water shortage levels, the City has developed the crosswalk illustrated below (based on the City’s 2020 Plan) that translated the City’s previously established shortage levels to the mandated standard shortage levels. Table 8-1 also provides a cross-reference between the City’s previously established shortage levels and the mandated standard shortage levels.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-9
Corresponding Relationships Between Supplier's Established Shortage Levels and the WSCP Mandated Shortage Levels
Established
Level
Supply
Condition/Shortage
WSCP
Standard
Level
Shortage Level
1 Up to 30% 1 ≤ to 10%
2 30% to 50% 2 10 to 20%
3 50% or greater 3 20 to 30%
4 30 to 40 %
5 40 to 50 %
6 > 50 %

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

Shortage response actions are dependent on the severity of a declared shortage level.

Response actions implement varying improvements and regulations of system Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-10
infrastructure and operations, water supply augmentation, demand reduction initiatives and other water use functions to conserve water supplies.

8.4.1 SUPPLY AUGMENTATION
The City does not plan to add a new source of water supply to address customer demands, but instead will consider increased supplies from existing sources. Table 8-2 reflects this approach and does not identify any new supplies. Instead, the City will focus on demand reduction measures in the event existing sources of supply are not sufficient to meet customer demands. As discussed in Chapter 6, the City’s sources of water supply include groundwater produced from the Central Basin, imported surface water purchased from MWD through Central Basin Municipal Water District, and recycled water supplies provided by LACSD. As noted in Section 8.2, the City is required to annually prepare and submit an Annual Assessment which will include a review of water supplies available to meet water demands for the current and upcoming years. If the City is currently in, or considers entering into, one of the standard water shortage levels identified in Section

8.3, the City will consider the water supply (augmentation) actions shown below.

For each water shortage level discussed in Section 8.3, the City will consider supplementing its existing water supplies through purchase of additional imported water supplies. Due to previous critically dry conditions, MWD developed the “Water Supply Allocation Plan” whereby available supplies are equitably allocated to its member agencies, including Central Basin Municipal Water District. The WSAP establishes ten different shortage levels and a corresponding drought allocation to each member agency.

Based on the shortage level established by MWD, the WSAP provides a reduced drought allocation to a member agency for its M&I retail demand. The ratio of MWD water supply drought allocation to local water supply will change based on the WSAP stage. Any Full Service water delivered in excess of a drought allocation is subject to a penalty rate in addition to the normal rate paid for the water.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-11
In addition to the WSAP, MWD describes supply augmentation actions in its Regional 2025 UWMP, which is incorporated by reference. MWD’s primary first response to any gap between core supplies (from the State Water Project and Colorado River) and demand is to make optimal use of its supply augmentation options, consisting of drawing from flexible supply programs and storage reserves. MWD has developed and actively manages a portfolio of water supply programs including water transfer, storage, and exchange agreements. MWD pursues voluntary water transfer and exchange programs to help mitigate supply/demand imbalances and provide additional dry-year supply sources. Based on MWD’s historical and on-going water supply and storage programs and management practices, the City can potentially continue relying on purchased imported water supplies from MWD through CBMWD for adequate supply augmentation in response to each of the standard water shortage levels identified in Section 8.3.

8.4.2 DEMAND REDUCTION
The City may establish water shortage response actions to reduce demand on water supplies. These demand reduction actions include irrigation and other outdoor use restrictions, rate structure changes, and other water use prohibitions. Depending on the percent reduction in the City water supply and corresponding water shortage level, regulations are made to conserve water and reduce the shortage gap in normal supply levels. Many demand reduction actions, identified as voluntary or mandatory conservation measures, are applicable to all levels of water shortages. The structure of water shortage levels are designed to strongly encourage customers with high per capita usage to achieve proportionally greater reduction than those with low usage. Violations of these demand reduction actions will be considered waste and an unreasonable use of water.

Table 8-3 describes each demand reduction action and its effect on reducing the shortage gap.

A full listing of the restrictions/prohibitions associated with each shortage level is provided below.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-12
General Prohibitions
The following water conservation requirements are effective at all times and are permanent. Violations of this section will be considered waste and an unreasonable use of water.

A. Limits on Watering Hours. Watering or irrigating of lawn, landscape or other vegetated area with potable water is prohibited between the hours of 10:00 a.m. and 5:00 p.m. on any day, except by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Limit on Watering Duration. Watering or irrigating of lawn, landscape or other vegetated area with potable water using a landscape irrigation system or a watering device that is not continuously attended is limited to no more than 15 minutes watering per day per station. This subsection does not apply to landscape irrigation systems that exclusively use very low-flow drip type irrigation systems when no emitter produces more than two gallons of water per hour and weather based controllers or stream rotor sprinklers that meet a 70% efficiency standard.

C. No Excessive Water Flow or Runoff. Watering or irrigating of any lawn, landscape or other vegetated area in a manner that causes or allows excessive water flow or runoff onto an adjoining sidewalk, driveway, street, alley, gutter or ditch is prohibited.

D. No Washing Down Hard or Paved Surfaces. Washing down hard or exterior paved surfaces, including, but not limited to, sidewalks, walkways, driveways, parking areas, patios or alleys, is prohibited except when necessary to alleviate safety or Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-13
sanitary hazards, and then only by use of a hand-held bucket or similar container, a handheld hose equipped with a positive self-closing water shut-off device, a lowvolume, high-pressure cleaning machine equipped to recycle any water used, or a low-volume high-pressure water broom.

E. Obligation to Fix Leaks, Breaks or Malfunctions. Excessive use, loss or escape of water through breaks, leaks or other malfunctions in the water user's plumbing or distribution system for any period of time after such escape of water should have reasonably been discovered is prohibited and shall be repaired as soon as reasonably practicable.

F. Re-Circulating Water Required for Water Fountains and Decorative Water Features. Operating a water fountain or other decorative water feature that does not use recirculated water is prohibited.

G. Limits on Washing Vehicles. Using water to wash or clean a vehicle, including, but not limited to, any automobile, truck, van, bus, motorcycle, boat or trailer, whether motorized or not is prohibited, except by use of a hand-held bucket or similar container or a hand-held hose equipped with a positive self-closing water shutoff nozzle or device. This subsection does not apply to any commercial vehicle washing facility.

H. Drinking Water Served Upon Request Only. Eating or drinking establishments, including, but not limited to, a restaurant, hotel, café, cafeteria, bar, or other public place where food or drinks are sold, served, or offered for sale, are prohibited from providing drinking water to any person unless expressly requested.

I. No Installation of Single Pass Cooling Systems. Installation of single pass cooling systems is prohibited in buildings requesting new water service.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-14
J. Limits on Commercial Car Wash and Laundry Systems. Installation of nonrecirculating water systems is prohibited in new commercial conveyor car wash and new commercial laundry systems.

Water Shortage Level 1
A Water Shortage Level 1 may be declared when the City Council determines it is likely that the City will suffer a shortage in City water supplies up to 10% of its normal water supplies.

In addition to the General Prohibitions identified above, the following water conservation requirements apply during a declared Water Shortage Level 1:

A. Limits on Watering Days. Watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to three days per week on a schedule established and posted by the City. Watering or irrigating of lawn, landscape or other vegetated area with potable water is prohibited between the hours of 6:00 a.m. and 6:00 p.m. Pacific Standard Time. This provision does not apply to landscape irrigation zones that exclusively use very low flow drip type irrigation systems when no emitter produces more than two gallons of water per hour. This provision also does not apply to watering or irrigating by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 72 hours of notification by the City unless other arrangements are made with the City.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-15
Water Shortage Level 2
A Water Shortage Level 2 may be declared when the City Council determines it is likely that the City will suffer a shortage in City water supplies up to 20% of its normal water supplies.

In addition to the General Prohibitions identified above, the following water conservation requirements apply during a declared Water Shortage Level 2:

A. Limits on Watering Days. Watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to three days per week on a schedule established and posted by the City. Watering or irrigating of lawn, landscape or other vegetated area with potable water is prohibited between the hours of 6:00 a.m. and 6:00 p.m. Pacific Standard Time. This provision does not apply to landscape irrigation zones that exclusively use very low flow drip type irrigation systems when no emitter produces more than two gallons of water per hour. This provision also does not apply to watering or irrigating by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 72 hours of notification by the City unless other arrangements are made with the City.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-16
Water Shortage Level 3
A Water Shortage Level 3 will be declared when the City Council determines it is likely that the City will suffer a shortage in City water supplies up to 30% of its normal water supplies.

In addition to the General Prohibitions identified above, the following water conservation requirements apply during a declared Water Shortage Level 3:

A. Limits on Watering Days. Watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to three days per week on a schedule established and posted by the City. Watering or irrigating of lawn, landscape or other vegetated area with potable water is prohibited between the hours of 6:00 a.m. and 6:00 p.m. Pacific Standard Time. This provision does not apply to landscape irrigation zones that exclusively use very low flow drip type irrigation systems when no emitter produces more than two gallons of water per hour. This provision also does not apply to watering or irrigating by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 72 hours of notification by the City unless other arrangements are made with the City
Water Shortage Level 4
Upon the declaration by the City of a Water Shortage Level 4, the City will implement the mandatory Level 4 conservation measures identified in this section. In addition to the Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-17
prohibited uses of water identified in the above sections, the following additional water conservation requirements apply during a declared Water Shortage Level 4:

A. Watering Days. Watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to two days per week on a schedule established and posted by the City. During the months of November through March, watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to no more than one day per week on a schedule established and posted by the City. This provision does not apply to landscape irrigation zones that exclusively use very low flow drip type irrigation systems when no emitter produces more than two gallons of water per hour. This provision also does not apply to watering or irrigating by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 48 hours of notification by the City unless other arrangements are made with the City.

C. Limits on Filling Ornamental Lakes or Ponds. Filling or refilling ornamental lakes or ponds is prohibited, except to the extent needed to sustain aquatic life, provided that such animals are of significant value and have been actively managed within the water feature prior to declaration of a supply shortage level under this chapter.

D. Limits on Washing Vehicles. Using water to wash or clean a vehicle, including, but not limited to, any automobile, truck, van, bus, motorcycle, boat or trailer, whether motorized or not, is prohibited except by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-18
nozzle or device, by high pressure/low volume wash systems, or at a commercial car washing facility that utilizes a recirculating water system to capture or reuse water.

E. Limits on Filling Residential Swimming Pools and Spas. Refilling of more than one foot and initial filling of residential swimming pools or outdoor spas with potable water is prohibited.

F. Commercial Nurseries Watering Limitations. Commercial nurseries shall be prohibited from watering lawn, landscaped or other turf areas more often than every other day and shall be prohibited from watering between the hours of 10:00 a.m. and 4:00 p.m.

G. Mandatory Water Restrictions. No customer shall make, cause, use or permit the use of City water for any purpose in excess of 85% of the amount used the same corresponding monthly billing period two years preceding the City Council declaring a Phase I Water Supply Shortage. In the case of newly established business, no restriction shall be required until such time that the business has been established for one year, at which time the preceding year's corresponding monthly billing shall be used to determine the businesses monthly water consumption.

Water Shortage Level 5
Upon the declaration by the City of a Water Shortage Level 5, the City will implement the mandatory Level 5 conservation measures identified in this section. In addition to the prohibited uses of water identified in the above sections, the following additional water conservation requirements apply during a declared Water Shortage Level 5:

A. Watering Days. Watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to two days per week on a schedule established and Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-19
posted by the City. During the months of November through March, watering or irrigating of lawn, landscape or other vegetated area with potable water is limited to no more than one day per week on a schedule established and posted by the City. This provision does not apply to landscape irrigation zones that exclusively use very low flow drip type irrigation systems when no emitter produces more than two gallons of water per hour. This provision also does not apply to watering or irrigating by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, or for very short periods of time for the express purpose of adjusting or repairing an irrigation system.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 48 hours of notification by the City unless other arrangements are made with the City.

C. Limits on Filling Ornamental Lakes or Ponds. Filling or refilling ornamental lakes or ponds is prohibited, except to the extent needed to sustain aquatic life, provided that such animals are of significant value and have been actively managed within the water feature prior to declaration of a supply shortage level under this chapter.

D. Limits on Washing Vehicles. Using water to wash or clean a vehicle, including, but not limited to, any automobile, truck, van, bus, motorcycle, boat or trailer, whether motorized or not, is prohibited except by use of a hand-held bucket or similar container, a hand-held hose equipped with a positive self-closing water shut-off nozzle or device, by high pressure/low volume wash systems, or at a commercial car washing facility that utilizes a recirculating water system to capture or reuse water.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-20
E. Limits on Filling Residential Swimming Pools and Spas. Refilling of more than one foot and initial filling of residential swimming pools or outdoor spas with potable water is prohibited.

F. Commercial Nurseries Watering Limitations. Commercial nurseries shall be prohibited from watering lawn, landscaped or other turf areas more often than every other day and shall be prohibited from watering between the hours of 10:00 a.m. and 4:00 p.m.

G. Mandatory Water Restrictions. No customer shall make, cause, use or permit the use of City water for any purpose in excess of 85% of the amount used the same corresponding monthly billing period two years preceding the City Council declaring a Phase I Water Supply Shortage. In the case of newly established business, no restriction shall be required until such time that the business has been established for one year, at which time the preceding year's corresponding monthly billing shall be used to determine the businesses monthly water consumption.

Water Shortage Level 6
A Water Shortage Level 6 is also referred to as an "Emergency" condition. A Water Shortage Level 6 condition exists when the City of Vernon declares a water shortage emergency or when the City Council determines that the City will suffer a shortage of more than 50% of its normal water supplies. Upon the declaration of a Water Shortage Level 6 condition, the City shall notify its residents and businesses that a significant reduction in consumer demand is necessary to maintain sufficient water supplies for public health and safety and shall implement the mandatory Water Shortage Level 6 conservation measures identified in this section.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-21
In addition to the prohibited uses of water identified in the Sections above, the following water conservation requirements apply during a declared Water Shortage Level 6 Emergency:

A. No Watering or Irrigating. Watering or irrigating of lawn, landscape or other vegetated area with potable water is prohibited. This restriction does not apply to the following categories of use, unless the City has determined that recycled water is available and may be applied to the use:

1. Maintenance of vegetation, including trees and shrubs, that are watered using a hand-held bucket or similar container, handheld hose equipped with a positive self-closing water shut-off nozzle or device;

2. Maintenance of existing landscape necessary for fire protection;

3. Maintenance of existing landscape for soil erosion control;

4. Maintenance of plant materials identified to be rare or essential to the wellbeing of protected species;

5. Maintenance of landscape within active public playing fields and school grounds, provided that such irrigation does not exceed two days per week according to the schedule established in Section 13.20.060(A) and the time restrictions as established in Section 13.20.050(A) of the City’s Municipal Code;

6. Actively irrigated environmental mitigation projects.

B. Obligation to Fix Leaks, Breaks or Malfunctions. All leaks, breaks, or other malfunctions in the water user's plumbing or distribution system must be repaired within 24 hours of notification by the City unless other arrangements are made with the City.

C. Commercial Nurseries Watering Limitations. Commercial nurseries shall be prohibited from watering lawn, landscaped or other turf areas more often than Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-22
every third day and shall be prohibited from watering between the hours of 6:00 a.m. and 6:00 p.m.

D. Mandatory Water Restrictions. No customer shall make, cause, use or permit the use of City water for any purpose in excess of 75% of the amount used the same corresponding monthly billing period two years preceding the City Council declaring a Phase I Water Supply Shortage. In the case of a newly established business, no restriction shall be required until such time that the business has been established for one year, at which time the preceding year's corresponding monthly billing period shall be used to determine the businesses monthly water consumption.

E. Fire Hydrant Use. The use of water from a fire hydrant shall be limited to fire fighting and related activities. Other uses of City water for municipal purposes shall be limited to activities necessary to maintain the public health, safety and welfare.

F. Customer Water Conservation Report. The City may, by written request, require all commercial and industrial customers using 100 acre feet or more per year of potable water to submit a water conservation plan and quarterly progress reports on such plan. The conservation plan shall include recommendations for increased water savings, including increased water recycling based on feasibility. The quarterly report shall include progress to date on implementation of such recommendations.

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

Section 8.4.2 describes the City’s standard water shortage levels and associated demand reduction measures. Section 8.4.1 describes the City’s water supply sources and water Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-23
supply augmentation actions available. The supply augmentation actions and demand reduction measures, when implemented, may potentially result in short-term operational changes which are necessary to allow the City to utilize all available water supply sources in response to water shortage situations.

As noted in Section 8.2, the City is required to annually prepare and submit an Annual Assessment which will include a review of the water supplies available to meet water demands for the current and upcoming years. Preparation of the Annual Assessment will assist the City in determining any potential operational changes. In addition, the City’s standard water shortage levels and the associated demand reduction measures, in conjunction with the City’s existing Demand Management Measures (discussed in Chapter 9), will be essential to the City in reducing water demands during any water shortage period. The operational changes the City will consider in addressing noncatastrophic water shortages on a short-term basis include the following:
 Improved monitoring, analysis, and tracking of customer water usage to enforce demand reduction measures
 Optimized production from existing available water supply sources  Potential use of emergency supply sources, including emergency interconnections  Potential blending of water supply resources
 Improved monitoring, maintenance, and repairs to reduce water distribution system losses

8.4.4 ADDITIONAL MANDATORY RESTRICTIONS
The mandatory restrictions which are implemented by the City to reduce customer demands are discussed in Section 8.4.2. There are no additional mandatory restrictions planned at this time.

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-24

8.4.5 EMERGENCY RESPONSE PLAN
Catastrophic water shortages are incorporated in the City’s standard water shortage levels (identified in Section 8.3) and the associated demand reduction measures (described in Section 8.4.2). In addition to the water supply augmentation actions (Section 8.4.1) and potential operational changes (Section 8.4.3) which the City may consider in order to continue providing sufficient water supplies, the City will review and implement any necessary steps included in its “Emergency Response Plan”.

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

The City’s RRA, previously prepared in 2021 and updated in 2026, evaluates the vulnerabilities, threats, and consequences from potential hazards to the City’s water system. The City prepared its RRA (which is incorporated by reference) by evaluating the following items:
 Natural hazards and malevolent acts (i.e., all hazards);  Resilience of water facility infrastructure (including pipes, physical barriers, water sources and collection, treatment, storage and distribution facilities, and electronic, computer and other automated systems);
 Monitoring practices;
 Financial systems (e.g., billing systems);
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-25
 Chemical storage and handling; and
 Operation and maintenance.

The City’s RRA evaluated a series of potential malevolent acts, natural hazards, and other threats in order to estimate the potential “monetized risks” (i.e. associated economic consequences to both the water system and surrounding region, and the likelihood of occurrence) associated with the City’s water facility assets. The cost-effectiveness of implementing potential countermeasures to reduce risks was also reviewed.

The City’s ERP, previously prepared in 2021 and updated in 2026, provides the management, procedures, and designated actions the City and its employees will implement during emergency situations (including catastrophic water shortages) resulting from natural disasters, system failures and other unforeseen circumstances. The City’s ERP (which is incorporated by reference) provides the guidelines for evaluating an emergency situation, procedures for activating an emergency response, and details of the different response phases in order to ensure that customers receive a reliable and adequate supply of potable water. The scope of the ERP includes emergencies which directly affect the water system and the ability to maintain safe operations (such as a chlorine release, and earthquake or a threat of contamination). The ERP also incorporates the results of City’s RRA and includes the following:
 Strategies and resources to improve resilience, including physical and cybersecurity
 Plans and procedures for responding to a natural hazard or malevolent act  Actions and equipment to lessen the impact of a natural hazard or malevolent act  Strategies to detect natural hazards or malevolent act The City will review the ERP for procedures regarding the utilization of alternative water supply sources in response to water supply shortages, including during the standard Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-26
water shortage levels. The City will also review applicable procedures described in the ERP regarding any necessary temporary shutdown of water supply facilities, including appropriate regulatory and public notifications.

8.4.6 SEISMIC RISK ASSESSMENT AND MITIGATION PLAN
CWC 10632.5.
(a) In addition to the requirements of paragraph (3) of subdivision (a) of Section 10632, beginning January 1, 2020, the plan shall include a seismic risk assessment and mitigation plan to assess the vulnerability of each of the various facilities of a water system and mitigate those vulnerabilities.
(b) An urban water supplier shall update the seismic risk assessment and mitigation plan when updating its urban water management plan as required by Section 10621. (c) An urban water supplier may comply with this section by submitting, pursuant to Section 10644, a copy of the most recent adopted local hazard mitigation plan or multihazard mitigation plan under the federal Disaster Mitigation Act of 2000 (Public Law 106-390) if the local hazard mitigation plan or multihazard mitigation plan addresses seismic risk.

The City prepared a local “Hazard Mitigation Plan” in 2023. The Hazard Mitigation Plan identifies effective ways to assess the significant natural hazards (including earthquakes) that may affect the City and its residents. The Hazard Mitigation Plan provides resources, information, and strategies to reduce the City’s vulnerability to these hazards, while providing guidance for the coordination of mitigation activities throughout the City. The Hazard Mitigation Plan includes mitigation projects necessary to reduce seismic risk to the City’s water distribution system facilities (including its distribution system pipelines, groundwater wells, booster pumps, and storage reservoirs) and potential disruptions in providing water service. The City’s Hazard Mitigation Plan is provided in Appendix L.

The County of Los Angeles prepared a “All-Hazards Mitigation Plan” in 2025 which identified methods to assess significant natural hazards (including earthquakes) affecting areas throughout Los Angeles County, and the mitigation strategies necessary to reduce Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-27
risks, including seismic risk. The County’s All-Hazards Mitigation Plan is provided in Appendix M.

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

Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-28
Location of Earthquake Faults
Source: https://maps.conservation.ca.gov/cgs/fam/App/
The California Geological Survey provides earthquake hazard maps5 based on the Modified Mercalli Intensity (MMI) scale, which measures earthquake shaking intensity and its impacts on people, objects, and buildings. The area within the City’s service area has an MMI of approximately 9.5 calculated based on the level of shaking that has a 2 percent chance of being exceeded in 50 years (or the level of shaking with an approximate 2,500- year average repeat time). An MMI at this intensity (violent shaking) can result in buildings shifted off foundations, cracked, or tilted, the ground cracked, and underground pipes broken. As discussed in Section 8.4.5, the City has prepared an Emergency Response Plan which provides the management, procedures, and designated actions the City and its employees will implement during emergency situations resulting from natural 5 https://conservation.ca.gov/cgs/sh/earthquake-shaking-potential City’s Service Area
Resolution No. 2026-033

___________________
2025 Urban Water Management Plan

City of Vernon Page 8-29
disasters, including during earthquakes, to ensure that customers receive a reliable and adequate supply of potable water. The City’s ERP is incorporated by reference.

8.4.7 SHORTAGE RESPONSE ACTION EFFECTIVENESS
The effectiveness of the shortage response actions for each of the standard water shortage levels identified in Section 8.3 is evident in the City’s historical ability to meet its customer’s water demands in response to a water supply shortage. In addition, the City imposes water consumption regulations and restrictions, and supports local agencies in efforts to enforce regulations and prohibitions on water use. The effectiveness of each of the City’s shortage response actions, in order to reduce any potential gaps between supply and demand, has been quantified in the expected demand reduction provided in Table 8-2 and Table 8-3.

Section 6.1 provides a tabulation of the City’s historical annual water demands for each water supply source. During the past 15 years, the City experienced a five consecutive year drought within its service area from CY 2011 to CY 2015. Throughout this extended dry year period, the City’s annual water production ranged from 8,217 AF to 8,765 AF, with an average of approximately 8,549 AF. In addition, historical records indicate the City previously produced a maximum of up to 12,232 AF during CY 2000. The City has been able to provide sufficient water supplies to its customers, including during long-term droughts and years with historically high water demands. In addition, the City has been able to provide water service to meet maximum day water demands for these years, including during the summer months.

The City’s water demands during the most recent five years (from CY 2021 to CY 2025) averaged approximately 5,890 AFY. Due to conservation efforts and demand management measures (discussed in Chapter 9), the City’s recent water demands have been less than its historical water demands, including during long-term droughts. The City’s projected water demands (during normal, single dry, and multiple dry years) are Resolution No. 2026-033