2025 Urban Water
Management Plan
Draft
MAY 2026 CITY OF CHINO
CITY OF CHINO
2025 Urban
Water
Management
Plan Draft
MAY 2026
Prepared by Water Systems Consulting, Inc
City of Chino
2025 Urban Water Management Plan | ii
TABLE OF CONTENTS
1 Introduction ................................ ................................ ................................ ...................... 1-1
1.1 Introduction for Chino ................................ ................................ ................................ 1-2
1.2 UWMP Organization and Lay Description ................................ ................................ . 1-3
1.3 UWMPs in Relation to Other Efforts ................................ ................................ .......... 1-5
1.4 UWMPs and Grant or Loan Eligibility ................................ ................................ ........ 1-6
1.5 Demonstration of Consistency with the Delta Plan for Participants in Covered Actions 1- 6 2 Plan Preparation ................................ ................................ ................................ .............. 2-1
2.1 Basis for Preparing a Plan ................................ ................................ ........................ 2-2
2.2 Regional Planning ................................ ................................ ................................ ..... 2-2
2.3 Coordination and Outreach ................................ ................................ ....................... 2-3 3 System Description ................................ ................................ ................................ .......... 3-1
3.1 General Description ................................ ................................ ................................ .. 3-2
3.2 Service Area Boundary Maps ................................ ................................ ................... 3-2
3.3 Service Area Climate ................................ ................................ ................................ 3-4
3.4 Service Area Population and Demographics ................................ ............................. 3-5
3.5 Land Uses within Service Area ................................ ................................ ................. 3-7 4 Water Use Characterization ................................ ................................ ............................. 4-1
4.1 Non-Potable Versus Potable Water Use ................................ ................................ ... 4-2
4.2 Past, Current, and Projected Water Use by Sector ................................ ................... 4-2
4.3 Water Use for Lower-Income Households ................................ ............................... 4-11
4.4 Climate Change Considerations ................................ ................................ .............. 4-11 5 SBX7-7 Compliance & Future Water Use Efficiency Requirements ................................ . 5-1
5.1 Compliance and Future Water Use Efficiency Requirements ................................ .... 5-2 6 Water Supply Characterization ................................ ................................ ......................... 6-1
6.1 Potable Water Supply Sources ................................ ................................ ................. 6-2
6.2 Stormwater ................................ ................................ ................................ ............. 6-10
6.3 Wastewater and Recycled Water ................................ ................................ ............ 6-10
6.4 Desalinated Water Opportunities ................................ ................................ ............ 6-15
6.5 Water Exchanges and Transfers ................................ ................................ ............. 6-16
6.6 Supply from Storage ................................ ................................ ............................... 6-17
6.7 Future Water Projects ................................ ................................ ............................. 6-17
6.8 Summary of Historical Production and Future Supplies ................................ .......... 6-18 City of Chino
2025 Urban Water Management Plan | iii
6.9 Climate Change Effects ................................ ................................ .......................... 6-21
6.10 Energy Use ................................ ................................ ................................ ......... 6-21 7 Water Service Reliability ................................ ................................ ................................ .. 7-1
7.1 Introduction ................................ ................................ ................................ ............... 7-2
7.2 Water Service Reliability Assessment ................................ ................................ ....... 7-2
7.3 Drought Risk Assessment ................................ ................................ ......................... 7-6 8 Water Shortage Contingency Plan ................................ ................................ ................... 8-1
8.1 Introduction ................................ ................................ ................................ ............... 8-2
8.2 Overview of WSCP Components ................................ ................................ .............. 8-2
8.3 Water Supply Reliability Analysis ................................ ................................ .............. 8-3
8.4 Annual Water Supply and Demand Assessment ................................ ....................... 8-4
8.5 Six Standard Water Shortage Levels ................................ ................................ ........ 8-5
8.6 Shortage Response Actions ................................ ................................ ...................... 8-7
8.7 Communication Protocols ................................ ................................ ....................... 8-21
8.8 Compliance and Enforcement ................................ ................................ ................. 8-22
8.9 Legal Authorities ................................ ................................ ................................ ..... 8-23
8.10 Financial Consequences of WSCP ................................ ................................ ...... 8-24
8.11 Monitoring and Reporting ................................ ................................ .................... 8-24
8.12 WSCP Refinement Procedures ................................ ................................ ........... 8-25
8.13 Special Water Feature Distinction ................................ ................................ ....... 8-25
8.14 UWMP Adoption, Submittal, and Availability ................................ ........................ 8-25 9 Demand Management Measures ................................ ................................ ..................... 9-1
9.1 Introduction ................................ ................................ ................................ ............... 9-2
9.2 Existing Demand Management Measures ................................ ................................ . 9-2
9.3 Reporting Implementation ................................ ................................ ......................... 9-6
9.4 Implementation to Achieve Water-Use Targets ................................ ......................... 9-8 10 Plan Adoption, Submittal, and Implementation ................................ ........................... 10-1
10.1 Completed Steps for UWMP and WSCP ................................ ............................. 10-2
10.2 Plan Submittal ................................ ................................ ................................ ..... 10-2
10.3 Public Availability ................................ ................................ ................................ . 10-2
10.4 Amending an Adopted UWMP or WSCP ................................ ............................. 10-2 References ................................ ................................ ................................ ................................ 1 Appendix A DWR Tables ................................ ................................ ................................ ...... A Appendix B 60 Day Notifications ................................ ................................ .......................... B Appendix C Public Notices ................................ ................................ ................................ ... C Appendix D Adoption Resolution ................................ ................................ .......................... D City of Chino
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Appendix E DWR Checklist ................................ ................................ ................................ .. E Appendix F Chino Basin Judgment ................................ ................................ ...................... F Appendix G WFA and City of Chino Purchase Agreement ................................ .................... G Appendix H Water Conservation Ordinances ................................ ................................ ........ H
City of Chino
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LIST OF FIGURES
Figure 3-1- City of Chino Water Service Area and City Limits ................................ ................. 3-3 Figure 3-2- Annual Precipitation from 1999-2025 ................................ ................................ .... 3-4 Figure 4-1- UWUO Projections by Component, AFY ................................ ............................... 4-8 Figure 4-2- Historic and Projected Demand, AFY ................................ ................................ .. 4-10 Figure 6-1- Chino Basin Boundary Area ................................ ................................ .................. 6-3 Figure 6-2- Location of CDA Facilities ................................ ................................ ..................... 6-8 Figure 6-3- Location of IEUA Regional Water Recycling Plants ................................ ............ 6-11 Figure 8-1- Corresponding Relationships Between Supplier's 2015 Shortage Levels and the 2025 WSCP Mandated Shortage Levels ................................ ................................ ................. 8-6 Figure 8-2- Location of Earthquake Faults (California Department of Conservation, 2025) ... 8-17 Figure 8-3- Earthquake Shaking Potential ................................ ................................ ............. 8-19 City of Chino
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LIST OF TABLES
Table 2-1- Public Water Systems - Retail ................................ ................................ ................ 2-2 Table 2-2- Plan Identification ................................ ................................ ................................ ... 2-3 Table 2-3- Supplier Identification ................................ ................................ ............................. 2-3 Table 2-4- Water Supplier Information Exchange - Retail ................................ ........................ 2-3 Table 3-1- Average Monthly Climate Data ................................ ................................ ............... 3-5 Table 3-2- SCAG Growth Units & Annual Growth Rates ................................ ......................... 3-6 Table 3-3- Current and Projected Population ................................ ................................ .......... 3-6 Table 3-4- Chino Demographics and Socioeconomic Data ................................ ..................... 3-7 Table 3-5- Land Uses within City of Chino ................................ ................................ .............. 3-8 Table 4-1- 2021-2025 Actual Water, AF ................................ ................................ .................. 4-3 Table 4-2- Water Loss Reporting - Retail ................................ ................................ ................ 4-4 Table 4-3- Progress Towards 2028 Water Loss Standard ................................ ....................... 4-5 Table 4-4- Total Potable and Non-Potable Water Use - Retail ................................ ................ 4-5 Table 4-5- Water Efficiency Standard by Reporting Period................................ ...................... 4-6 Table 4-6- UWUO Components Growth Assumptions ................................ ............................. 4-7 Table 4-7- UWUO Projections by Component, AFY ................................ ................................ 4-9 Table 4-8- Projected Potable and Non-Potable Water Use - Retail ................................ ....... 4-10 Table 4-9- Inclusion in Water Use Projections ................................ ................................ ....... 4-11 Table 5-1- SBX7-7 2020 Target Progress ................................ ................................ ............... 5-2 Table 6-1- Groundwater Volume Pumped - Retail ................................ ................................ ... 6-2 Table 6-2- Wastewater Collected Within Service Area in 2025 ................................ .............. 6-12 Table 6-3- Wastewater Treatment and End Uses in 2025 ................................ ..................... 6-13 Table 6-4- Recycled Water Direct Beneficial Uses - Retail ................................ .................... 6-15 Table 6-5- 2020 UWMP Recycled Water (RW) Projection Compared to 2025 Actual - Retail 6-15 Table 6-6- Methods to Encourage Future Recycled Water Use ................................ ............. 6-15 Table 6-7- Expected Future Water Supply Projects or Programs - Retail .............................. 6-18 Table 6-8- 2025 Water Supplies - Retail................................ ................................ ................ 6-19 City of Chino
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Table 6-9- Projected Water Supplies - Retail ................................ ................................ ........ 6-20 Table 6-10- Total Utility Approach for Single Water Delivery Products - Energy Reporting ... 6-22 Table 7-1- Water Supply Reliability Assessment - Retail ................................ ......................... 7-3 Table 7-2- Normal Year Supply and Demand Comparison - Retail ................................ .......... 7-4 Table 7-3- Single Dry Year Supply and Demand Comparison – Retail ................................ .... 7-4 Table 7-4- Five Consecutive Dry Years Supply and Demand Comparison – Retail ................. 7-5 Table 7-5- Five-Year Drought Risk Assessment - Retail ................................ ......................... 7-7 Table 8-1- Water Shortage Contingency Plan Levels ................................ .............................. 8-7 Table 8-2- Demand Reduction Actions ................................ ................................ .................. 8-11 Table 8-3- Supply Augmentation and Other Actions (DWR Table 8-3) ................................ .. 8-13 Table 9-1- Rebate Program Participation FY 2021 through FY 2025 ................................ ....... 9-7 Table 9-2- IEUA DMM Education and Outreach Program ................................ ....................... 9-8 City of Chino
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ACRONYMS & ABBREVIATIONS
°F Degrees Fahrenheit
1,2,3 -TCP 1,2,3 -Trichloropropane
AF Acre -Fee t
AFY Acre -Feet per Year
AMI Advanced Metering Infrastructure
AWWA American Water Works Association
CBWCD Chino Basin Water Conservation District
CCWRF Carbon Canyon Water Recycling Facility
CDA Chino Basin Desalter Authority
CII Commercial, Industrial, and Institutional
CIMIS California Irrigation Management Information System CWC California Water Code
CWOL Making Conservation a California Way of Life
DEW Discover the Environment and Water
DIM Dedicated Irrigation Meters
DMM Demand Management Measures
DRA Drought Risk Assessment
DWR California Department of Water Resources
DYY Dry -Year Yield
DYYP Dry -Year Yield Program
ERP Emergency Response Plan
ETO Evapotranspiration
FEMA Federal Emergency Management Agency
FY Fiscal Year
GIS Geographic Information System
GPCD Gallons per Capita per Day
GPM Gallons per minute
City of Chino
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GPMD Gallons per mile of pipe per day
GPSCD Gallons per service connection per day
HECW High -efficiency Clothes Wash er
HET High Efficiency Toilets
HVAC Heating, Ventilation, and Air conditioning
IEUA Inland Empire Utilities Agency
IPR Indirect Potable Reuse
JPA Joint Exercise of Powers Agreement
KWH Kilowatt -Hour
LEF Landscape Efficiency Factors
MGD Million Gallons per Day
MWD Metropolitan Water District of Southern California NTC National Theatre for Children
OBMP Chino Basin Optimum Basin Management Program
OSY Operating Safe Yield
PCE Perchloroethylene
PHET Premium High -Efficiency Toilets
PPC Persons -per -connection
PWS Public Water System
RHNA Regional Housing Needs Assessment
RP Regional Water Recycling Plant
RRA Risk and Resilience Assessment
RTP Regional Transportation Plan
RUWMP Regional Urban Water Management Plan
RW Recycled Water
SBX7 -7 Senate Bill 7 of Special Extended Session 7
SCAG Southern California Association of Governments
SCE Southern California Edison
SGMA Sustainable Groundwater Management Act
STATE WATER
BOARD
State Water Resources Control Board
City of Chino
2025 Urban Water Management Plan | x
TAZ Transportation Analysis Zones
TCE Trichloroethylene
TDS Total Dissolved Solids
TVMWD Three Valleys Municipal Water District
USEPA United States Environment Protection Agency
UWMP Urban Water Management Plan
UWUO Urban Water Use Objective
VOCS Volatile Organic Compounds
WBIC Weather -based Irrigation Controllers
WE 4G Water Engineering 4 Good
WEWAC Water Education Water Awareness Committee
WFA Water Facilities Authority
WSAP Water Supply Allocation Plan
WSCP Water Shortage Contingency Plan
WUE Water Use Efficiency
WWTP Wastewater Treatment Plant
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1 Introduction
This section provides a brief overview of the City of Chino (City or Chino ) and the purpose of this 2025 Urban Water
Management Plan (UWMP). It also describes how the UWMP is organized and its relation ship to local and regional planning efforts in which Chino is involved.
IN THIS S ECTIO N
• Introduction for Chino
• California Water Code
• UWMP Organization
• UWMPs in Relation to Other
Efforts
• Funding Eligibility
• Consistency with the Delta Plan
City of Chino
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1.1 Introduction for Chino
An urban water supplier is defined (pursuant to Section 10617 of the California Water Code (CWC) 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 cont ractor for water, regardless of the basis of right, which distributes or sells for ultimate resale to customers.”
The City of Chino (City or Chino) is classified as an urban water supplier because it serves more than 3,000 customers (i.e., individual metered accounts) and it supplies more than 3,000 acre- feet of water annually to its customers for municipal purposes as detailed in Section 2.1.
In 1983, the State of California Legislature (Legislature) enacted the Urban Water Management Planning Act (UWMP Act). The law requires an urban water supplier to adopt an UWMP every five years by July 1 of years ending in “6” and “1”, incorporating updated and new information from the five years preceding each update. This UWMP must demonstrate water supply reliability under both normal and drought conditions for a minimum 20-year planning horizon.
The UWMP Act applies to wholesale and retail water suppliers.
Since the original UWMP Act was passed, it has undergone significant expansion. Prolonged droughts, groundwater overdraft, regulatory revisions, and changing climatic conditions affect the reliability of each water supplier as well as statewide water reliability overseen by the California Department of Water Resources (DWR), the State Water Resources Control Board (State Water Board), and the Legislature. Accordingly, the UWMP Act has grown to address changing conditions. The current requirements are found in Sections 10610-10656 and 10608 of the CWC.
In 2018, the Legislature modified the CWC to require a Water Shortage Contingency Plan (WSCP) with specific elements. The WSCP is a document that provides a supplier with an action plan for a drought or catastrophic water supply shortage. CWC 10632 includes requirements for suppliers to prepare a WSCP. The WSCP documents a supplier’s plans to manage and mitigate an actual water shortage condition, should one occur because of drought or other impacts on water supplies. The WSCP is a standalone document that can be updated independently of the UWMP, but it can be included as a section of the UWMP or referenced and attached to the 2025 UWMP as an appendix. The WSCP is described in Section 8.
DWR provides guidance for urban water suppliers by preparing an Urban Water Management Plan Guidebook 2025 (Guidebook) (Department of Water Resources, 2025) conducting workshops, developing tools, and providing program staff to help water suppliers prepare comprehensive and useful water management plans, implement water conservation programs, and understand the requirements of the CWC. Suppliers prepare their own UWMPs and submit them to DWR. DWR then reviews the UWMPs for completeness in addressing the CWC. DWR City of Chino
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submits a report to the Legislature summarizing the status of the UWMPs for each five-year cycle. The Guidebook was used to complete this 2025 UWMP.
The purpose of this UWMP is for Chino to evaluate long-term resource planning and establish management measures to ensure adequate water supplies are available to meet existing and future demands. The UWMP provides a framework to help water suppliers maintain efficient use of urban water supplies, promote conservation programs and policies, ensure that sufficient water supplies are available for future beneficial use, and provide a response mechanism during drought conditions or other water supply shortages.
The UWMP is a valuable planning tool used for multiple purposes, including:
• Providing a standardized methodology for water utilities to assess their water resource needs and availability.
• Serving as a resource to the community and other interested parties regarding water supply and demand, conservation, and other water-related information. • Providing a key source of information for cities and counties when considering approval of proposed new developments and preparing regional long-range planning documents, such as city and county General Plans.
• Informing other regional and Statewide water planning efforts, such as Integrated Regional Water Management Plans and the California Water Plan.
1.2 UWMP Organization and Lay Description
The 2025 UWMP is organized as follows:
Section 1 – Introduction
This section provides background information on the UWMP process, new regulatory requirements, and an overview of the information covered throughout the remaining sections.
The 2025 UWMP incorporates the DWR water use and supply tables (standardized tables) for the reporting and submittal of UWMP data. These tables are included within the respective sections of the 2025 UWMP and in Appendix A. Chino’s coordination efforts with other planning agencies, eligibility to receive grants and loans administered by the State of California, and demonstration of consistency with the Delta Plan are discussed.
Section 2 – Plan Preparation
This section provides information on the processes used to develop the UWMP, including coordination and outreach efforts and the steps taken to prepare Chino’s 2025 UWMP, hold a public hearing, adopt, submit, and implement the 2025 UWMP. The UWMP is prepared as an individual plan to provide Chino-specific information, with all data presented on a fiscal year (FY) basis (July 1 through June 30) and water quantities reported in acre-feet (AF) or acre-feet per year (AFY). The UWMP also describes Chino’s coordination and outreach with wholesale and retail agencies and the community, as well as its notification process to the cities and county it serves.
City of Chino
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Section 3 – System Description
This section describes the City’s water system, service area, population demographics, local climate, and land uses. Chino is located in the southwestern part of San Bernardino County, neighboring cities such as Ontario, Montclair, Chino Hills, and Eastvale. The City serves a majority of its boundary, excluding some areas served by Monte Vista Water District and the City of Chino Hills. The City provides water service to an area with a current population of 65,744. Chino is projected to have a population of 114,327 by 2050.
Section 4 – Water Use Characterization
This section describes and quantifies the current and projected water uses through 2050 within the water service area. Chino serves potable water to residential, commercial, industrial, and institutional (CII), landscape, and agricultural customers. In 2025, the City served a total of 15,324 AFY. The City’s water loss within the system is discussed. Chino has submitted all required water loss audits to the state for the past 5 years. Projected water use in 2050 will reach about 17,500 AFY using an approach that will reach State-mandated Urban Water Use Objectives (UWUO). Projected water use will steadily increase for the next 25 years.
Section 5 – SBX7-7 Compliance & Future Water Use Efficiency Requirements This section describes water use targets and baselines pursuant to the SBX7-7 Water Conservation Act of 2009. SBX7-7 required all water suppliers to increase water use efficiency to decrease per-capita water consumption by 20 percent by the year 2020. The City met its targeted reduction of 189 gallons per capita per day (GPCD). In 2025, the City had a GPCD of 143.
New water use efficiency standards from the “Making Conservation a California Way of life Regulation” (CWOL Regulation) supersede SBX7-7 standards. The demand projections in this UWMP are based on the City meeting its estimated future UWUO, as described in Section
4.2.5. Section 6 – Water Supply Characterization
This section describes and quantifies the current and projected potable and non-potable water supplies, including recycled water. The City’s supply portfolio consists of groundwater from the Chino Basin, purchased groundwater from Chino Basin Desalter Authority (CDA), imported water from Metropolitan Water District of Southern California (MWD) (through Inland Empire Utilities Agency (IEUA)) which is treated by Water Facilities Authority (WFA), and recycled water purchased from IEUA. In 2025, the City supplied a total of 18,832 AFY. The City is projected to supply a total of 21,811 AFY in 2050.
Section 7 – Water Service Reliability
This section describes the water service reliability through 2050 and includes the Drought Risk Assessment (DRA) for the next five years. Chino does not anticipate any supply shortages within the next five years, as shown in the DRA. Chino’s imported and groundwater supply is fixed to meet cleanup goals and is considered reliable under normal, single dry, and five City of Chino
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secutive dry years scenarios through 2050. The City expects to meet demands under all water year scenarios.
Section 8 – Water Shortage Contingency Plan
This section summarizes the standalone WSCP. The WSCP details procedures for handling potential shortages affecting member agencies. The plan features annual water supply and demand assessments, six water shortage stages with corresponding response actions, and coordination among member agencies. It also includes emergency response plans and seismic risk assessments for catastrophic events. This section includes an overview of the standalone WSCP.
Section 9 – Demand Management Measures
This section describes Chino’s efforts to promote conservation and reduce water demand, including discussions of specific demand management measures. The City is committed to implementing water conservation programs. Some of these initiatives include public education and outreach programs, rebate programs, and water rate structure tiered to promote water conservation.
Section 10 – Plan Adoption, Submittal, and Implementation This chapter summarizes the various requirements to adopt and submit a UWMP and WSCP.
Details on public hearing dates, notification letters to local agencies, and how to submit or amend a plan are discussed. The 2025 UWMP and WSCP were made available for public review on May 18, 2026, with a public hearing held on June 2, 2026. CDA adopted the UWMP and WSCP and submitted them to DWR and the California State Library within 30 days of adoption. Notifications were sent to cities, counties, and relevant agencies at least 60 days prior to the public hearing. The plan is available online and at Chino’s headquarters for public inspection. Procedures for amending the UWMP or WSCP involve public hearings, board adoption, and timely submissions to state and local entities.
1.3 UWMPs in Relation to Other Efforts
The City’s 2025 UWMP was prepared in coordination with planning agencies as described in Section 2.3. In addition to the 2025 UWMP, Chino is involved in several internal and external planning efforts. Chino collaborates with a variety of stakeholders to achieve consistency between various planning documents locally and regionally. The City is a member agency of various wholesale agencies including CDA, IEUA, and WFA, which have each prepared 2025 UWMPs that are incorporated in the City’s 2025 UWMP by reference. In addition, the City provided its 2025 UWMP to CDA, IEUA, and WFA, 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.
City of Chino
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1.4 UWMPs and Grant or Loan Eligibility
For a water supplier to be eligible for a grant or loan administered by DWR, the supplier must have a current UWMP on file that meets the requirements set forth by the CWC. A current UWMP must also be maintained by the supplier throughout the term of any grants or loans received. Chino has prepared the 2025 UWMP under guidance from DWR’s 2025 UWMP Guidebook to meet eligibility requirements for grants and loans administered by the State and/or DWR.
1.5 Demonstration of Consistency with the Delta Plan
for Participants in Covered Actions
Chino’s contributions to reduced reliance on the Sacramento–San Joaquin Delta and improved regional water self-reliance are reflected in the regional analysis prepared by the IEUA, presented in Appendix C of IEUA’s 2025 UWMP. That analysis evaluates the collective investments and actions of IEUA and its customer agencies, including Chino, and documents measurable progress toward increased regional self-reliance and reduced dependence on Delta supplies at the regional scale.
Consistent with DWR guidance, regional coordination and reliance on wholesale and regional planning documents are appropriate where data are developed at a broader service area or where individual supplier contributions cannot be discretely quantified. Due to the integrated nature of regional water supply systems and the infeasibility of attributing Delta reliance reductions at the individual retail agency level, IEUA’s regional analysis provides the appropriate basis for demonstrating consistency with Delta Plan Policy WR P1.
Accordingly, Chino incorporates the IEUA regional reduced reliance analysis by reference into this UWMP. Chino’s implementation of locally cost-effective and technically feasible demand management measures and supply programs, as described in this UWMP, contributes to the regional outcomes documented by IEUA and supports ongoing progress toward improved regional self-reliance and reduced reliance on Delta supplies.
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2 Plan Preparation
This section provides information on the processes used to develop the UWMP, including efforts in coordination and outreach. Chino’s 2025 UWMP was prepared consistently with the recommended organization provided in DWR’s Guidebook.
IN THIS S ECTIO N
• Basis for Preparing a Plan
• Regional Planning
• Coordination and Outreach
City of Chino
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2.1 Basis for Preparing a Plan
As mentioned in Section 1.1, the CWC requires Chino’s 2025 UWMP to be submitted to DWR by July 1, 2026. Chino is an “urban water supplier” pursuant to Section 10617 of the CWC. In 2025, the City’s key water supply metrics in its service area were as follows:
• Served a population of approximately 95,744 people.
• Supplied approximately 15,324 AFY to its customers.
• Maintained 23,420 metered connections.
Chino operates a Public Water Systems (PWS) which is regulated by the State Water Board.
Table 2-1 provides the public water system number, the number of municipal connections, and the volume of water supplied in 2025.
Throughout this UWMP, water volume is represented in units of AFY, unless otherwise noted, and data is presented on a FY basis which is July 1 through June 30th of the following year.
Required DWR tables presenting this information are provided in Table 2-2, Table 2-3, and Table 2-4.
Pursuant to CWC requirements, the City’s 2025 UWMP incorporates DWR’s standardized tables for the reporting and submittal of UWMP data. The standardized tables are provided within the body of the 2025 UWMP text as well as in Appendix A. The City also submitted the UWMP data (from the standardized tables) electronically through DWR’s Online Submittal Tool.
The City’s 2025 UWMP also provides supporting documents (appendices) including notification letters of the UWMP update, public notice of the UWMP hearing, and adoption resolution from the City’s governing body (Appendix B, Appendix C, and Appendix D). Further discussions regarding these supporting documents are provided within the individual Chapters of the City’s 2025 UWMP. A checklist of specific UWMP requirements is included in Appendix E. The checklist includes the page number where the required elements are addressed to assist in DWR’s review of the submitted UWMP.
Table 2-1- Public Water Systems - Retail
Public Water System
Number
Public Water System
Name
Number of
Municipal
Connections 2025
Volume of
Water Supplied
2025
CA3610012 Chino, City of 23,420 15,324
Total: 23,420 15,324
2.2 Regional Planning
DWR guidance allows for water retailers to develop individual or regional UWMPs. Regional reporting can consist of a group of retailers or another regional entity. Chino has developed its 2025 UWMP reporting solely on its service area to address all requirements of the CWC. The City of Chino
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City’s 2025 UWMP was not developed as a Regional UWMP. Although a member of the IEUA Alliance, the City elected to develop an individual UWMP.
Table 2-2- Plan Identification
Type of Plan
Member of
RUWMP
Member of Regional
Alliance
Name of RUWMP or Regional
Alliance
Individual UWMP No No N/A
Table 2-3- Supplier Identification
Type of Supplier Year Type First Day of Year Unit Type
Retail Fiscal Years DD MM AF
01 07
2.3 Coordination and Outreach
Chino coordinated with multiple neighboring and stakeholder agencies to prepare the 2025 UWMP. The coordinated efforts were conducted to 1) inform these agencies of Chino’s efforts and activities; 2) gather high quality data for use in developing this UWMP; and 3) coordinate planning activities with other related regional plans and initiatives.
2.3.1 Wholesale and Retail Coordination
The City’s 2025 UWMP was prepared in coordination with each of its wholesale suppliers including IEUA, WFA, and CDA. Chino provided demand projections to each of these water agencies and received assumptions of planned water supply availability. Table 2-4 lists the agencies that were involved in the preparation of Chino’s 2025 UWMP.
Table 2-4- Water Supplier Information Exchange - Retail The retail Supplier has informed the following wholesale supplier(s) of projected water use in accordance with Water Code Section 10631 (h).
Wholesale Water Supplier Name
Inland Empire Utilities Agency (IEUA)
Water Facilities Authority (WFA)
Chino Bain Desalter Authority (CDA)
City of Chino
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2.3.2 Coordination with Other Agencies and the Community The City is a retail water supplier that serves customers in the City of Chino and a small portion of the City of Ontario, as well as unincorporated areas of San Bernardino County, and portions of a California State correctional facility located within the City’s municipal boundaries. The City is required to coordinate the preparation of the UWMP 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 the Cities of Chino Hills and Ontario, the County of San Bernardino, CDA, Chino Basin Water Conservation District (CBWCD), IEUA, Monte Vista Water District, Chino Basin Watermaster, WFA, and the California Institute for Men.
Per Government Code 6066, the public hearing was noticed in the Chino Champion newspaper on May 2026. The hearing notice is attached as Appendix C. The public hearing was held on June 2, 2026, at the City Council meeting prior to the UWMP and WSCP adoption. In addition, Chino maintained a copy of the 2025 UWMP and WSCP in its office and at http://www.cityofchino.org prior to the public hearing.
The Final 2025 UWMP and WSCP were formally adopted by the City Council on June 2, 2026.
A copy of the Adoption Resolution is included in Appendix D. A hard copy of Chino’s Final 2025 UWMP and WSCP were sent to the California State Library, DWR (electronically using the WUE data reporting tool), and all cities and counties within Chino’s service area within 30 days of adoption. To fulfill the requirements of CWC Section 10642 of the UWMP Act, Chino made the Final 2025 UWMP available online (https://www.cityofchino.org), and at Chino’s public office during normal business hours for public review within 30 days of adoption.
Should Chino need to amend the adopted 2025 UWMP or WSCP in the future, Chino will hold a public hearing for review of the proposed amendments to the document. Chino will send a 60- day notification letter to all cities and counties within Chino’s service area and notify the public.
Notification to the public with be published twice in the newspaper, the first notice being a minimum of two weeks prior to the public hearing. Once the amended document is adopted, a copy finalized version will be sent to the California State Library, DWR (electronically using the WUE data reporting tool), and all cities and counties within Chino’s service area within 30 days of adoption. The finalized version will also be made available to the public both online at http://www.cityofchino.org and in person at Chino’s public office during normal business hours.
2.3.3 Notice to Cities and Counties
CWC Section 10621 requires that suppliers notify cities and counties to which they serve water that the UWMP and WSCP are being updated. Notices should be provided at least 60 days prior to a public hearing. To fulfill this requirement, the City sent letters of notification of preparation of the 2025 UWMP and 2025 WSCP to all cities and counties within Chino’s service area 60 days prior to the public hearing. Copies of letters are included in Appendix B.
2025 Urban Water Management Plan | 3-1
3 System Description
This section describes Chino ’s water system, service area, population demographics, local climate, and land uses.
IN THIS S ECTIO N
• General Description
• Service Area Boundary Map
• Service Area Climate,
Demographics, and
Socioeconomics
• Land Uses
City of Chino
2025 Urban Water Management Plan | 3-2
3.1 General Description
The City of Chino was officially incorporated in 1910. The City provides water service to a majority of residential, commercial, institutional, industrial, and landscape customers within the City of Chino, located in the southwestern portion of San Bernardino County, approximately 30 miles easterly of downtown Los Angeles. The City is bounded by the Cities of Montclair and Ontario to the north; Chino Hills to the south and west; Ontario and Eastvale to the east; and Pomona to the west. The City’s water service area encompasses an area of approximately 28.3 square miles. The location of the City’s water service area is provided in Figure 3-1.
The City has a five-member City Council. The Mayor is elected at-large and Council Members are elected by geographically defined districts, each for four-year terms. The City Manager is appointed by the City Council. Other City managerial positions are filled by the City Manager.
The Director of Public Works is responsible for the operation and management of the City's water system.
The demand within the City’s service area is met primarily from groundwater produced from City-owned wells in the Chino Basin and from CDA. The City also purchases imported surface water from MWD through IEUA which is treated by WFA. Recycled water is also provided by IEUA.
The existing potable water system consists of distribution system pipelines, storage reservoirs, booster pump stations, groundwater wells, imported water connections, inter-agency connections, permitted water treatment facilities, and pressure regulating stations.
3.2 Service Area Boundary Maps
The location of the City’s water service area is provided in Figure 3-1.
The City provides water services to all residential, commercial, institutional, industrial, and landscape customers within the City of Chino, except for the following areas:
• Portions of northwest City of Chino served by Monte Vista Water District • Portions of the City served by the City of Chino Hills
City of Chino
2025 Urban Water Management Plan | 3-3
Figure 3-1- City of Chino Water Service Area and City Limits
City of Chino
2025 Urban Water Management Plan | 3-4
3.3 Service Area Climate
The City’s service area climate is a mediterranean environment with a semi-arid environment with mild winters, warm summers, and moderate rainfall. Historical climate information was obtained from the National Oceanic and Atmospheric Administration, and from DWR’s California Irrigation Management Information System (CIMIS) Station 255 Chino collected from January 1998 through July 2025. On average, the annual total precipitation is 11.29 inches, with most of the precipitation occurring between December and March. Records show that the monthly average precipitation ranges from 0.02 inches in June to 2.87 inches in February. The annual average total evapotranspiration (ETo) is 49.97 inches. The highest ETo is experienced between April and September, with the peak occurring in July. The City’s monthly high temperature ranges from about 66.4 degrees Fahrenheit (°F) in December to 94.4 °F in August, with an average annual temperature of 66.5°F. Table 3-1 shows the average monthly climate data.
Figure 3-2 shows the annual precipitation from 1999 through 2025 and illustrates which years fall above or below the annual average precipitation for this period. Some years do not have data provided. As shown by this figure, 2018 was the driest year since, making water management more critical to ensure communities are prepared for the next drought.
Figure 3-2- Annual Precipitation from 1999-2025
0 5
10 15
20 25
30 1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
Inches
Total Yearly Precipitation Average Yearly Precipitation City of Chino
2025 Urban Water Management Plan | 3-5
Table 3-1- Average Monthly Climate Data
MONTH
AVERAGE
TEMPERATURE (ºF)
AVERAGE PRECIPITATION
(INCHES)
AVERAGE ETO
(INCHES)
January 55.7 2.15 1.97
February 56.2 2.87 2.47
March 59.4 1.61 3.76
April 63.0 0.75 4.74
May 67.5 0.29 5.22
June 73.2 0.02 6.0
July 79.1 0.06 6.74
August 80.0 0.09 6.48
September 77.0 0.12 4.03
October 69.6 0.41 3.51
November 61.3 0.82 2.36
December 54.9 2.02 1.79
MONTHLY
AVERAGE: 66.5 0.93 4.16
SOURCES: Historical average monthly precipitation and temperature information was obtained from the National Oceanic and Atmospheric Administration (https://www.weather.gov/wrh/Climate?wfo=sgx) from 1998 through 2025 (for Ontario International Airport). Historical monthly average ETo information was obtained from the California Irrigation Management Information Systems (http://wwwcimis.water.ca.gov) and is based on data collected from Station 255 (Chino).
3.4 Service Area Population and Demographics
Southern California Association of Governments (SCAG) develops demographic and growth forecasts for the 2024 Connect SoCal Regional Transportation Plan (RTP) (Southern California Association of Governments, 2024), including projected population, households, and employment in 2019, 2035, and 2050 across approximately 13,062 traffic analysis zones (TAZs) in the SCAG region. SCAG publishes jurisdiction and TAZ-level data as geographic information system (GIS) shapefiles, which are intersected with supplier service areas to estimate growth City of Chino
2025 Urban Water Management Plan | 3-6
units within those areas as shown in Table 3-2. Forecasts are based on land use data, the 2020 Census, and Cycle 6 Regional Housing Needs Assessment (RHNA), and are refined through local review, incorporating land use and zoning information, input from planners, and coordination with local and regional land use authorities.
Table 3-2- SCAG Growth Units & Annual Growth Rates
2019 2035 2050
Population
Projection
(SCAG) 85,857 95,038 106,632
Annual Growth Rate
(Calculated) - 0.64% 0.77%
Employment
Projection
(SCAG) 49,286 55,995 60,182
Annual Growth Rate
(Calculated) - 0.80% 0.48%
Households
Projection
(SCAG) 24,124 32,645 37,996
Annual Growth Rate
(Calculated) - 1.91% 1.02%
2020 Census data was used to determine Chino’s 2020 service area population. 2020 population data was then used in conjunction with the service area’s number of connections in 2020 to calculate a ‘persons-per-connection’ (PPC) factor of 4.1. This factor was then applied to the number of connections provided for 2025 to estimate the current population as of 2025.
Annual growth rates for 2019-2050 were calculated from SCAG growth units in Table 3-2.
Annual growth rates were applied to 2025 population to estimate 2030-2050 populations for the service area as shown in Table 3-3.
Table 3-3- Current and Projected Population
POPULATION SERVED 2020 2025 2030 2035 2040 2045 2050
TOTAL: 86,366 95,744 98,820 101,897 106,040 110,183 114,327 1 2020 Census Population Data
2 Assumes a calculated PPC factor of 4.1.
Demographic and socioeconomic data for the City are reported in Table 3-4.
City of Chino
2025 Urban Water Management Plan | 3-7
Table 3-4- Chino Demographics and Socioeconomic Data
Race and Ethnicity
Hispanic or Latino 50%
White 17%
Black or African American 5%
American Indian and Alaska Native <1%
Asian 26%
Native Hawaiian and Pacific Islander <1%
Other or Multiple Races 2%
Income and Households
Median Household Income $97,461
Percent Living at or Below Poverty Line 11%
Percent of households owning home 72%
Vacancy Rate 1%
Sources:
1. 2020 Decennial Census
2. 2024 American Community Survey 1-Year Estimates
Accessed at: Data.census.gov
3.5 Land Uses within Service Area
The City reviewed the current and projected land uses within its service area during the preparation of this 2025 UWMP. Information regarding current and projected land uses is included in the City’s 2021 Water Master Plan. The City is primarily residential in the north with industrial and warehouses in the south. The existing land uses within the City’s service area include residential (single-family and multi-family), commercial, industrial, institutional, agricultural, and open space. The projected land uses within the City’s service area are expected to remain similar to the existing land uses. Areas within the City’s service area continue to be developed. As a result, 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 4.2.1. As discussed in Section 2.3, the City coordinated the preparation of the 2025 UWMP with the Cities of Chino Hills and Ontario, the County of San Bernardino, and other agencies.
City of Chino
2025 Urban Water Management Plan | 3-8
Table 3-5- Land Uses within City of Chino
Land Use Designation Area (acre) %
Business Park (BP) 437 2.70%
Commercial General (CG) 339 2.09%
Commercial Neighborhood (CN) 44 0.27%
Commercial Office (CO) 87 0.54%
Commercial Regional (CR) 241 1.49%
Commercial Service (CS) 54 0.33%
General Industrial Zone (M2) 4,319 26.67%
Light Industrial (M1) 1,089 6.73%
Open Space Natural (OS 2) 709 4.38%
Open Space Recreational (OS 1) 975 6.02%
Public (P) 858 5.30%
Public School (PS) 124 0.76%
Residential (RD 1) 60 0.37%
Residential (RD 12-19) 240 1.48%
Residential (RD 20-30) 678 4.19%
Residential (RD 2-4) 471 2.91%
Residential (RD 4.5-7) 2,551 15.75%
Residential (RD 8-11) 2,915 18.00%
Total 16,192 100%
2025 Urban Water Management Plan | 4-1
4 Water Use Characterization
This section describes and quantifies Chino ’s past, current, and future water use through 2050 .
IN THIS S ECTIO N
• Non -Potable Versus Potable
Water Use
• Past, Current, and Projected
Water Use by Sector
• Water Use for Lower Income
Households
• Climate Change Considerations
City of Chino
2025 Urban Water Management Plan | 4-2
4.1 Non-Potable Versus Potable Water Use
Chapter 4 addresses the City’s potable water demands. Recycled water demands are addressed separately in Section 6.3.2.1 and a summary is provided in Table 6-4. Raw water is not served by the City and is not applicable.
4.2 Past, Current, and Projected Water Use by Sector
Chino provides potable water to its customers as described in further detail in the following sections.
4.2.1 Water Use Sectors Listed in Water Code
Water suppliers are required to identify water uses to the extent that records are available for each of the applicable water use sectors identified in CWC 10631(d). The City primarily serves potable water to customers, though it does supply a small amount of recycled water. Recycled water uses are described in Section 6.3.2.
The City serves the following water uses:
• Single Family: Single-family residential customers are typically on a lot with a free- standing building containing one dwelling unit that may include a detached secondary dwelling.
• Multi-Family: Multi-family residential customers are typically multiple dwelling units within one building or several buildings within one complex. • Commercial: Commercial customers typically provide or distribute a product or service. • Industrial: Industrial customers typically manufacture or process materials. • Landscape: The City tracks the water use for landscape irrigation. • Agricultural: The City tracks the water use for agricultural irrigation. • Other: The City has accounts for other uses, which include hydrant accounts. • Distribution System Water Losses: Distribution system water losses are the water losses from the point of water entry to the distribution system to the delivery point to the customer’s system. Water losses are discussed in Section 4.2.3.
4.2.2 Past Water Use
Chino’s actual water use by customer class from 2021-2025 is shown in Table 4-1. Historical demand trends have been considered as part of projected water use in Section 4.2.5 and water service reliability in Section 7.
City of Chino
2025 Urban Water Management Plan | 4-3
Table 4-1- 2021-2025 Actual Water, AF
Use Type 2021 2022 2023 2024 2025 % Average
Single Family 7,779 7,434 6,479 6,666 7,230 48%
Multi-Family 1,400 1,361 1,270 1,339 1,383 9%
Commercial 2,104 2,192 2,083 2,118 2,188 14%
Industrial 508 504 488 475 470 3%
Landscape 2,613 2,559 2,025 2,023 2,584 16%
Agricultural 16 17 15 15 24 >0%
Other (optional) 63 84 68 39 44 >0%
Distribution System Water Loss 1,230 1,373 1,658 1,419 1,400 9% Total: 15,713 15,524 14,085 14,094 15,324
4.2.3 Distribution System Water Losses
Distribution system water losses are the physical potable water losses from the point of water entry to the distribution system to the point of delivery to the customer’s system. Water loss can result from aging infrastructure, leaks, seepage, theft, metering inaccuracies, data handling errors, and other causes. Addressing water losses can increase water supplies and recover revenue. The City monitors its water loss and prepares an annual American Water Works Association (AWWA) Water Audit to estimate the volume of water loss. The City has submitted all required water loss audits to the State, as shown in Table 4-2.
City of Chino
2025 Urban Water Management Plan | 4-4
Table 4-2- Water Loss Reporting - Retail
Public Water System ID #
Reported in Table 2-1 R Reporting Period Submitted to DWR Water Loss Audit Program
CA3610012
2021 Yes
2022 Yes
2023 Yes
2024 Yes
NOTES:
2020 AWWA: AWWA-WAS-2020_validated093021.xls
2021 AWWA: AWWA-WAS-2021CA3610012_AC rev2.xlsx
2022 AWWA: FWAS v6.0_release version 2022 - revised.xlsx 2023 AWWA: FWAS-CHINO-2023_VALIDATED (1).xlsx
2024 AWWA: City of Chino CY2024 - Validated Water Audit.xlsx
CWC Section 10608.34 required the State Water Board to develop water loss performance standards for urban retail water suppliers to minimize water waste through system leaks. Water loss performance standards were developed through a rulemaking that became effective in 2023. Under the regulations, each supplier will be required to comply, by 2028, with an individualized volumetric water loss standard based on real loss, using the economic model developed by the State Water Board and the supplier’s own unique data. Real loss is the physical loss of water from water distribution systems, as opposed to apparent losses, which are revenue losses due to meter inaccuracies, billing errors, or unauthorized consumption. A supplier’s baseline water loss is calculated as the average water loss from at least three of the four water loss audits from 2017 – 2020. The real water loss performance standard is based on gallons per service connection per day (gpscd), or gallons per mile of pipe per day (gpmd), depending on how the supplier reports real loss. Post-2028 compliance with volumetric water loss standards will be assessed every three years based on the average of the supplier’s real loss from the preceding three years, with an allowed variation of 5 gpscd above the supplier’s water loss standard. Apparent loss standards are equal to the baseline apparent loss and compliance is evaluated at the same time as compliance with the Real Water Loss Performance Standard.
Although the compliance period has not yet started, CWC Section 10631 (d)(3)(C) requires water suppliers to provide data in the UWMP to show whether the supplier met its State Water Board water loss performance standard.
Based on data released by the State on January 30, 2026, the City’s baseline real water loss is
43.7 gpscd and the real water loss standard is 19.0 gpscd, and the apparent loss standard is the baseline of 8.5 gpscd. As shown in Table 4-3, based on the most recent water loss audit City of Chino
2025 Urban Water Management Plan | 4-5
from 2024, the City has not yet met the real water loss performance standard, but is working toward that goal by 2028. Section 9 discusses the City’s programs to assess and manage distribution system real loss.
Table 4-3- Progress Towards 2028 Water Loss Standard
Public Water System ID #
Reported in Submittal Table 2-1 R CA3610012
Did the Water Board Calculate a Water Loss Standard for this Public Water System? Yes
2028 Real Water Loss Standard per Unit per day 19
Units for Real Water Loss gpscd
Number of Units 23,052
Volume of Total Real Loss (from AWWA Water Loss Audit) 1,038 Real Water Loss Per Unit per Day 40.2
2028 Apparent Water Loss Standard per Unit per Day 8.5 Units for Apparent Water Loss gpscd
Number of Connections 23,052
Volume of Total Apparent Loss (from AWWA Water Loss Audit) 201 Apparent Water Loss Per Unit per Day 7.8
4.2.4 Current Water Use
In 2025, the City provided 15,324 AF of water to its customers as shown in Table 4-4.
Table 4-4- Total Potable and Non-Potable Water Use - Retail Use Type 2025 Actual Potable or Non-Potable Volume
Single Family Potable 7,230
Multi-Family Potable 1,383
Commercial Potable 2,188
Industrial Potable 470
Landscape Potable 2,584
Agricultural Potable 24
Other (optional) Potable 44
Distribution System Water Loss Potable 1,400
Total: 15,324
City of Chino
2025 Urban Water Management Plan | 4-6
4.2.5 Projected Water Use
The “Making Conservation a California Way of Life” Regulation (CWOL Regulation) establishes unique water budget-based Urban Water Use Objectives (UWUO) for each urban retail water supplier in the State. The CWOL Regulation requires suppliers to calculate an annual UWUO consisting of these core components:
UWUO = Residential Indoor Water Use Budget + Residential Outdoor Water Use Budget + Commercial, Industrial, and Institutional (CII) Dedicated Irrigation Meters (DIM) Outdoor Water Use Budget + Real Water Loss Budget.
Each component has associated water efficiency standards that become increasingly stringent through 2040 as shown in Table 4-5. The key standards are residential indoor GPCD, Landscape Efficiency Factors (LEF), and real water loss measured in gpscd. Annually updated supplier-specific input data is also required for population, climate, landscapes, and real water losses. The UWUO does not include some uses, such as CII indoor use or other uses that are considered “Excluded Demands.”
Table 4-5- Water Efficiency Standard by Reporting Period Year Residential
Indoor GPCD
Residential
Outdoor LEF CII DIMs Real Water Loss
Budget1
FY 23/24 55 0.8
Actual Reported
“Landscape”
Volume
Actual Reported
or Budget
FY 25/26 47 0.8
Actual Reported
“Landscape”
Volume
Actual Reported
or Budget
FY 30/31 42 0.8 0.8 LEF (starts July
1, 2028)
Budget (starts July
1, 2027)
FY 35/36 42 0.63 0.63 LEF Budget
FY 40/41 42 0.55 0.45 LEF Budget
Note: 1 Budget = City standard for real water loss (gallons per service connection per day) applied to total service connections.
DWR and the State Water Board have developed an annual reporting framework, tools, and guidance for calculating the UWUO and comparing it to the actual use for that year. The State Water Board’s “Water Use Objective Exploration Tool” allows users to enter varying efficiency standards and baseline year(s) of input data to calculate and visualize a comparison of historic demand to the UWUO with selected standards. The State Water Board’s “Annual UWUO and Water Use Report” tool pre-populates input data and standards for the given reporting year. To City of Chino
2025 Urban Water Management Plan | 4-7
project demands for this UWMP, a demand tool that aligns with the framework, data, and calculations of the State Water Board’s tools was used and expanded to allow for forecasting future years’ demand considering future efficiency standards, supplier input data, and growth assumptions.
Supplier input data and growth assumptions used in this UWMP for future years are shown in Table 4-6. Projected growth for residential indoor usage is associated with population projections described in Section 3.4. Residential landscape area growth is associated with the historic connections growth rate. The historic landscape area provided by the State in its UWUO tools was divided by the 2025 residential service connections to create a landscape area per connection factor that was applied to future connections to account for growth. CII DIM Landscape connections were assumed to scale with the historic connections growth rate.
Excluded demand growth was assumed to scale with the ratio of historic Excluded Demand to the UWUO applied to future UWUO estimates. The real water loss standard is applied to the sum of all projected future connections.
Table 4-6- UWUO Components Growth Assumptions
UWUO Component City Input Data Input Data for Growth Associated Assumption
Residential Indoor Population 2025-2050 population See Section 3.4 Residential Landscape Landscape area &
annual climate data
2025 Irrigable
Irrigated Residential
Landscape Area per
Service Connection
scaled to future
connections.
Historic connections
growth rate applied to
connections. Historic
average climate data
from the State is used
for future years.
CII DIM Landscape Water use
Historic Landscape
water use per service
connection scaled to
future connections.
Historic connections
growth rate applied to
"Landscape"
connections.
Real Water Loss Connections
City standard for Real
Water Loss (gpscd)
applied to future total
connections.
Sum of future
connections including
UWUO & Excluded
Demand categories
connections.
Excluded Demand (not
included in UWUO but
included in total
demand)
Water use
Ratio of historic
Excluded Demand to
UWUO applied to
future UWUO
estimates.
Future efficiency standards (see Table 4-5) were applied to existing customer residential population, residential landscaped area, CII landscape usage, and total connections. These City of Chino
2025 Urban Water Management Plan | 4-8
demand components for existing customers are shown to reduce over time as the standards become more stringent. Excluded demands were assumed to grow at the ratio of historic Excluded Demand to the UWUO. The most stringent standards in Table 4-5 for FY 40/41 were applied to all new growth connections for all time periods, recognizing that new construction will comply with efficient building codes. The resulting projected UWUO, excluded demands, and total demands for both existing and new growth connections are shown in Table 4-7 and Figure 4-1.
Figure 4-1- UWUO Projections by Component, AFY
0 2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
2020 2025 2030 2035 2040 2045 2050
Existing- Residential Indoor Existing- Residential Outdoor Existing- CII DIM Existing- Real Water Losses
Existing- Excluded Demands New- Residential Indoor
New- Residential Outdoor New- CII DIM
New- Real Water Losses New- Excluded Demands
Existing- Future Total UWUO Demand Target
City of Chino
2025 Urban Water Management Plan | 4-9
Table 4-7- UWUO Projections by Component, AFY
2030 2035 2040 2045 2050
Existing- Residential Indoor 4,504 4,504 4,517 4,504 4,504 Existing- Residential Outdoor 4,282 3,511 3,148 3,148 3,148 Existing- CII DIM 2,361 2,091 1,805 1,805 1,805
Existing- Real Water Losses 450 450 451 450 450
Existing- Future Total UWUO Demand Target 11,597 10,556 9,921 9,907 9,907 Existing- Excluded Demands 2,671 2,671 2,671 2,671 2,671 Existing- Total Demand 14,267 13,226 12,591 12,578 12,578 New- Residential Indoor 145 289 486 679 844
New- Residential Outdoor 637 991 1,345 1,699 2,111
New- CII DIM 137 273 410 547 679
New- Real Water Losses 171 232 294 354 440
New- Total UWUO Demand 1,089 1,786 2,535 3,279 4,073
New- Excluded Demands 246 403 572 740 920
New- Total Demand 1,335 2,189 3,107 4,019 4,993
Existing & New- Total UWUO Demand 12,686 12,342 12,455 13,186 13,981 Existing & New- Excluded Demands 2,916 3,074 3,243 3,411 3,590 Existing & New- Total Demand 15,603 15,415 15,698 16,597 17,571
While the City intends to meet the UWUO, it was also considered that demands may continue in alignment with historic patterns initially and take more time to reach direct alignment with the UWUO. Therefore, demands used for the purposes of supply reliability planning are assumed to trend from a historic baseline pattern downward to the UWUO by 2050.
A historic baseline demand per connection per customer type is used to approximate current “normal” demand patterns representative of a range of conditions for influential factors impacting demand, known as “demand drivers.” A key demand driver is rainfall. Ideal baseline years incorporate impacts of dry and wet years since demand typically fluctuates with rainfall due to the need for more irrigation in dry years and less in wet years. For this UWMP, a baseline period of 2021-2025 is used, which captures one average year, two wet years, and two dry years. Using demands in these years, a baseline water use was established for each connection type, then reduced at a constant rate to meet the UWUO water use for that connection type by 2050.
Figure 4-2 shows the UWUO and the baseline trend to the UWUO projection scenario and Table 4-8 presents the projected demand by customer type through 2050 for this UWMP.
City of Chino
2025 Urban Water Management Plan | 4-10
Figure 4-2- Historic and Projected Demand, AFY
Table 4-8- Projected Potable and Non-Potable Water Use - Retail
Additional
Description
Projected Water Use
Use Type Potable or
Non-
Potable
2030 2035 2040 2045 2050
Single Family Potable 8,070 8,009 8,070 8,230 8,472
Multi-Family Potable 1,437 1,371 1,327 1,302 1,292
Commercial Potable 2,395 2,599 2,803 3,007 3,211
Industrial Potable 524 554 584 615 645
Landscape Potable 2,513 2,197 1,966 1,804 1,699
Agricultural Potable 38 51 64 77 90
Other (optional) Potable 26 8 (10) (29) (46)
Distribution System
Water Loss Potable 1,538 1,705 1,873 2,041 2,208
Total: 16,541 16,495 16,677 17,047 17,571
Table 4-7,
Table 4-8, and Table 4-9 satisfy the requirement to include anticipated water conservation savings when developing future demand projections demand estimates for the next 25 years -
5,000
10,000
15,000
20,000
25,000
2015 2020 2025 2030 2035 2040 2045 2050
Water Demand (AFY)
Actual Total
Potable Demand
(AFY)
2- Baseline
Demand &
Conservation
Trend to UWUO
(AFY)
3- UWUO +
Excluded
Demand (AFY)
City of Chino
2025 Urban Water Management Plan | 4-11
since they account for water efficiency standards set by the State for the UWUO. The City is complying with and planning for UWUO standards as described in Sections 5 and 9.
4.3 Water Use for Lower-Income Households
Senate Bill 1087 requires that water use projections in a UWMP include projected water use associated with single-family and multi-family residential housing for lower-income households, as identified in the housing elements of any city, county, or city or county within the City’s service area. The RHNA establishes housing needs for each jurisdiction over the applicable planning period. SCAG adopted the 6th Cycle RHNA Allocation Plan, which covers the planning period from October 2021 through October 2029 (Southern California Association of Governments, 2021) SCAG’s population and household projections inform the RHNA Allocation Plan and are used in the determination and allocation of housing needs, including lower-income housing, for individual jurisdictions. The population projections in this UWMP are based on SCAG projections for the service area and therefore also incorporate the lower-income housing projections. The projected demands in this UWMP represent water use from all future growth and are inclusive of water use for lower income households.
Table 4-9- Inclusion in Water Use Projections
Are Future Water Savings Included in
Projections? Yes
Are Lower Income Residential Demands
Included in Projections? Yes
4.4 Climate Change Considerations
Future demand and use of supply sources may be affected by climate change. “Projections of climate change in California indicate a further intensification of wet and dry extremes and shifting temperatures that can…affect both water use and supplies. Extreme and higher temperatures can lead to increases in water use…Projections of more frequent, severe, and prolonged droughts could lead to not only less surface water available but also exacerbating ongoing stressors in groundwater basins across the state” (State of California Department of Water Resources, 2021).
Higher temperatures decrease the amount of water available for groundwater recharge and for surface water sources while increasing water use, especially for outdoor use. Reductions in future supply due to impacts associated with climate change were considered as part of the projected supply discussed in Section 6 and Section 7. Impacts to future water use patterns due to climate change factors were considered as part of the demand projections provided in Section 4.
City of Chino
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2025 Urban Water Management Plan | 5-1
5 SBX7-7 Compliance & Future
Water Use Efficiency Requirements
This section describes compliance with the Water Conservation Act of 2009, also known as Senate Bill 7 of Special Extended Session 7 (SBX7 -7). The section demonstrates compliance with the 2020 SBX7 -7 target and discusses future water use efficiency require ments.
IN THIS S ECTIO N
• Compliance and Future Water
Use Efficiency Requirements
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5.1 Compliance and Future Water Use Efficiency
Requirements
SBX7-7 was incorporated into the UWMP Act in 2009 and required that all water suppliers increase water use efficiency with the overall goal to decrease per-capita water consumption within the state by 20 percent by the year 2020.
SBX7-7 required DWR to develop certain criteria, methods, and standard reporting forms through a public process that water suppliers could use to establish their baseline water use and determine their water conservation targets. SBX7-7 and DWR's Methodologies for Calculating Baseline and Compliance Urban Per Capita Water Use (State of California Department of Water Resources, 2021) specify methodologies for determining the baseline water demand, 2015 interim urban water use target, and the 2020 urban water use target for the City as described in the 2020 UWMP. This section also demonstrates that the City achieved its 2020 water use target.
Table 5-1 below establishes the City’s 2020 actual and 2020 target GPCD. As shown, the City met its 2020 target. Most recently, in 2025, the water use was 143 GPCD, which is well below the 2020 target of 189 GPCD.
Table 5-1- SBX7-7 2020 Target Progress
2020 Target Actual 2020 GPCD Did Supplier Achieve Targeted Reduction for 2020?
189 169 Yes
New water use efficiency standards from the CWOL Regulation supersede SBX7-7 standards.
In 2018, two policy bills were enacted by the California Legislature, Assembly Bill 1668 (AB1668, 2018) and Senate Bill 606 (SB606, 2018), collectively referred to as the “2018 Water Conservation Legislation.” Based on the 2018 Water Conservation Legislation, related legislation, and subsequent adoption of the CWOL Regulation, each urban retail water supplier must comply with its UWUO. DWR and the State Water Board have developed a reporting framework for calculating the UWUO and compliance annually with efficiency standards becoming increasingly stringent through 2040.
The demand projections in this UWMP are based on the City meeting its estimated future UWUO, as described in Section 4.2.5 in order to plan and implement necessary demand management measures (described in Section 9) to support meeting the UWUO. Demand Mitigation Measures and UWUO compliance planning enhance resiliency for drought and other water shortage conditions as described in Sections 7, 8, and 9.
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6 Water Supply Characterization
This section describes and quantif ies Chino ’s current and projected potable and non -potable water supplies. It provi des a narrative description of each supply source and quantif ies the supply availability for each supply source identified .
IN THIS S ECTIO N
• Water Supply Analysis Overview
• Water Supply Characterization
• Energy Intensity
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6.1 Potable Water Supply Sources
The City currently produces groundwater from the Chino Basin. The City’s share of the Operating Safe Yield is 7.357 percent (Watermaster, November 21, 2024). Over the past ten years, the City has produced an average of 5,446 AFY from the Chino Basin, meeting the remainder of demands with purchased water. Table 6-1 shows production for the last five years.
The City’s production in 2025 and projected production from the Chino Basin, over the next 25 years in five-year increments, is provided in Table 6-9.
Table 6-1- Groundwater Volume Pumped - Retail
Groundwater Type Potable or
Non-Potable
Location or
Basin
Name
2021 2022 2023 2024 2025
Alluvial Basin Potable Chino Basin 6,133 6,193 5,569 5 ,858 6,186 Total: 6,133 6,193 5,569 5 ,858 6,186
6.1.1.1 Description
The Chino Basin is located within the Upper Santa Ana Valley within San Bernardino County and is bounded on the east by the Rialto-Colton fault; on the southeast by the contact with impermeable rocks forming the Jurupa Mountains; on the south by impermeable rocks of the Puente Hills and by the Chino fault; on the northwest by the San Jose fault; and on the north by the impermeable rocks of the San Gabriel Mountains and by the Cucamonga fault. The location of the Chino Basin is provided in Figure 6-1. The surface area of the Chino Basin is approximately 154,000 acres (or 240 square miles). The San Antonio Creek and Cucamonga Creek drain the Chino Basin area southward and flow into the Santa Ana River. Pursuant to DWR Bulletin 118 (for Basin Number 8-2.01), the Chino Basin is a subbasin of the Upper Santa Ana Valley Groundwater Basin and has a total storage capacity of approximately 5,000,000 AF.
The water-bearing units in the Chino Basin include Holocene and Upper Pleistocene alluvium.
This Holocene alluvium consists mainly of alluvial-fan deposits, with maximum thickness of 150 feet that are most coarse in and near the mouths of the canyons and are finer away from canyon mouths in the southern part of the Chino Basin. The Pleistocene alluvium is exposed mainly in the northern part of the subbasin and supplies most of the water to wells located within the Chino Basin. The Pleistocene alluvium is about 600 to 700 feet thick throughout most of the Chino Basin. The alluvium contains interfingering finer, alluvial-fan deposits and coarser, fluvial deposits.
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Figure 6-1- Chino Basin Boundary Area
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6.1.1.2 Sustainable Groundwater Management Act
Pursuant to the Sustainable Groundwater Management Act of 2014 (SGMA), the Chino 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 Chino Basin Watermaster submits its Annual Report to DWR.
6.1.1.3 Adjudication
The Chino Basin was adjudicated under the Chino Basin Judgment, entered on January 27, 1978, by the Superior Court for the County of San Bernardino. A link of the Chino Basin Judgment is provided in Appendix F. The Chino Basin Watermaster was created by the Judgment to administer the provisions of the Judgment as an arm of the Court.
The Chino Basin Judgment originally established a Safe Yield for the Chino Basin of 140,000 AFY. The Safe Yield is typically recalculated every 10 years and is defined in the Chino Basin Judgment as “the long-term average annual quantity of ground water (excluding replenishment of stored water but including return flow to the Basin from use of replenishment or stored water) which can be produced from the Chino Basin under conditions of a particular year without causing an undesirable result”. Pursuant to the most recent Safe Yield reset effective in 2020, the Safe Yield for the Chino Basin is currently 131,000 AFY (effective July 1, 2020, to June 30, 2030).
In April 2017, a Court Order regarding the Safe Yield of the Chino Basin (2017 Safe Yield Court Order) was issued, which caused the Safe Yield to be recalculated in 2025. The 2017 Safe Yield Court Order also required changes to the Safe Yield Reset methodology. The methodology was updated in 2022, and the 2025 Safe Yield Reset process began in 2023. The 2025 Safe Yield Reset is not final, so for purposes of this UWMP, the Safe Yield for the Chino Basin is based on the currently effective value of 131,000 AFY. Additional information on the 2025 Safe Yield Reset is available on the Chino Basin Watermaster website (https://www.cbwm.org/pages/syrm/).
The Chino Basin Judgment’s allocation of the Safe Yield includes three separate Pools:
1. Overlying Agricultural Pool (farmers, State of California, and other minimal producers).
2. Overlying Non-Agricultural Pool (businesses and industries).
3. Appropriative Pool (cities, agencies, and other water suppliers, including Ontario).
As of July 2020, the Safe Yield is allocated among these three pools at 82,800 AFY to the Overlying Agricultural Pool, 7,366 AFY to the Overlying Non-Agricultural Pool, and 40,834 AFY to the Appropriative Pool. The portion of the Safe Yield allocated to the Appropriative Pool is called the Operating Safe Yield (OSY).
The City is a member of the Appropriative Pool. Per the Judgment, the City has appropriative rights to 7.357 percent of the OSY. With an OSY of 40,834 AF, the City’s current appropriative right is approximately 3,004 AFY.
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Appropriators who are Parties to the Chino Basin Judgment are authorized to produce groundwater in excess of their rights. For any groundwater produced in excess of their rights, Appropriators pay assessments to the Chino Basin Watermaster, which are used to purchase water to replenish the Chino Basin. The Chino Basin Watermaster purchases water from MWD through IEUA and/or Three Valleys Municipal Water District (TVMWD), on behalf of the Parties, to replenish the Chino Basin. Occasionally, Watermaster has purchased water from storage accounts from parties within the Chino Basin.
In addition to the water rights described above, the City has rights to groundwater held in the Chino Basin as described below:
Land Use Conversion
When land is converted from agricultural to urban use, water rights are permanently transferred from the Overlying Agricultural Pool to the Appropriative Pool. As of FY 2024-2025, the City receives 158.440 AFY of pumping rights from land use conversions. Land use conversions assign the increase in Appropriative Pool rights to the party whose sphere of influence includes the converted land, thus the City’s rights come to a total of 9,749.234 AF.
Annual Unused Overlying Agricultural Pool Rights
The Chino Basin Watermaster also reallocates the unused portion of the Chino Basin Safe Yield from the Overlying Agricultural Pool to the Appropriative Pool members’ rights in any year.
These transfers are permanent if agricultural land has been converted to non-agricultural use (described above), or temporary if agricultural pool extractions are less than their share of the Safe Yield. Because these rights are not permanent, they are not included in Chino Basin rights in this UWMP.
Groundwater Storage Accounts
The City has rights to store water in the Chino Basin through the Appropriative Pool. The City holds water in both Excess Carryover accounts and Local Supplemental accounts. As of June 30, 2025, the City has 124,152.2 AF in storage. Storage account mechanisms are described in Section 6.1.1.4.
6.1.1.4 Adjudication
6.1.1.4.1 Chino Basin Optimum Basin Management Program
In 2000, the Chino Basin Watermaster developed the Chino Basin Optimum Basin Management Program (OBMP). The OBMP was developed in a collaborative process that identified the needs of the stakeholders, described the physical state of the basin, defined a set of management goals, identified impediments to these goals, and established a series of actions that would remove these impediments and achieve the management goals. The goals identified in the OBMP included: (1) Enhance Basin Water Supplied; (2) Protect and Enhance Water Quality; (3) Enhance Management of the Basin; and (4) Equitably Finance the OBMP.
The OBMP defines nine Program Elements which were incorporated into the OBMP Implementation Plan as part of the Court-ordered Peace Agreement (2000):
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• Program Element 1 - Develop and Implement Comprehensive Monitoring Program. • Program Element 2 - Develop and Implement Comprehensive Recharge Program. • Program Element 3 - Develop and Implement a Water Supply Plan for Impaired Areas. • Program Element 4 - Develop and Implement Comprehensive Groundwater Management Plan for Management Zone 1.
• Program Element 5 - Develop and Implement Regional Supplemental Water Program. • Program Element 6 - Develop and Implement Cooperative Programs with the Regional Board and Other Agencies to Improve Basin.
• Program Element 7 - Develop and Implement Salt Management Plan. • Program Element 8 - Develop and Implement Groundwater Storage Management Program.
• Program Element 9 - Develop and Implement Storage and Recovery Programs.
The “Peace Agreement” (2000) and the “Peace II Agreement” (2007) are agreements among the Parties that allow the implementation of the OBMP and guide the management of the Chino Basin, including the construction and operations of the Desalters, hydraulic control of the Basin, groundwater production and replenishment for the Desalters, yield accounting and recharge.
6.1.1.4.2 Chino Basin Storage Management Plan
The Peace Agreement (2000) establishes rules and regulations, standard storage agreements, and related forms for storage in the Chino Basin. Since 2000, Chino Basin Watermaster administers groundwater storage in the Chino Basin pursuant to the storage management plan described in Program 8 of the 2000 OBMP.
There are five types of storage accounts: Excess Carryover, Local Supplemental-Recycled, Local Supplemental-Imported, Pre-2000 Quantified Supplemental, and Storage and Recovery. • Excess Carryover account – includes a Party’s unproduced rights in the Safe Yield (Safe Yield for Overlying Non-Agricultural Pool Parties and OSY for Appropriative Pool Parties) and Basin Water purchased or transferred from other Parties. • Local Supplemental Water account (recycled and imported)– includes any imported and/or recycled water that is recharged by a producer and similar water acquired from other Parties.
• Pre-2000 Quantified Supplemental Account (same function as Local Supplemental Water Account).
• Storage and Recovery account – holds Supplemental Water (imported or recycled) and is intended to provide a broad and mutual benefit to the Parties of the Judgment.
The City has Excess Carryover and Local Supplemental accounts. The City also participates in the Dry Yield Year (DYY) Program, which is currently the only Storage and Recovery Program in the Chino Basin.
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6.1.1.4.3 Dry Year Yield Program
MWD’s Dry-Year Yield Program (DYYP) is the only active Storage and Recovery Program in Chino Basin. This program is a water exchange as discussed in Section 6.5.1.
6.1.1.4.4 Groundwater Clean-up
Groundwater in areas of the Chino Basin is currently contaminated with Perchlorate and Volatile Organic Compounds (VOCs), including 1,2,3-Trichloropropane (1,2,3-TCP), trichloroethylene (TCE), and perchloroethylene (PCE). In addition, nitrates and total dissolved solids (TDS) concentrations in areas of the Chino Basin exceed drinking water quality standards. Wellhead treatment is necessary in these areas to allow delivery of the groundwater for potable purposes.
6.1.2 Chino Desalter Authority
The City purchases treated Chino Basin groundwater from the Chino Basin Desalter Authority (through the “Amended and Restated Water Purchase Agreement, January 1, 2011” contract between the City and CDA).
The City’s current contract entitlement is 5,000 AFY. Over the past ten years, the City has purchased an average of 4,967 AFY from CDA.
The City’s purchases in 2025 and projected purchases from CDA over the next 25 years, in five- year increments, are provided in Table 6-9.
6.1.2.1 Agreement
On September 25, 2001, the Chino Basin Desalter Authority was formed under a Joint Exercise of Powers Agreement (JPA) to remove salts from brackish groundwater extracted from the lower Chino Basin. The area which receives water supplies from CDA is 304 square miles. A map showing CDA Desalter facilities and associated wells is provided in Figure 6-2.
CDA removes salts from brackish groundwater extracted from the lower Chino Basin through the Chino I and II Desalter facilities. The Chino I Desalter is located in the City of Chino and commenced operation in 2001 and was expanded in 2005 to have a total capacity of 14.2 million gallons per day (MGD). The Chino I Desalter includes reverse osmosis, ion exchange, and air stripper treatment for treating brackish water and removing nitrate and VOCs. The Chino II Desalter is located in Jurupa Valley and began operation in 2006 and was expanded in 2011 and again in 2017 to have a total capacity of 33 MGD. The Chino II Desalter includes reverse osmosis and ion exchange treatment for treating brackish water and removing nitrate. Following the expansion, CDA constructed the Concentrate Reduction Facility in 2017, which utilizes chemical softening to remove the limiting foulants (specifically, calcium and silica) from the reverse osmosis concentrate. CDA completed the South Archibald Plume Project in 2021 which included a new well to produce groundwater contaminated with TCE, conveyance to the Chino II Desalter, and air stripping treatment.
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Figure 6-2- Location of CDA Facilities
Source: (Chino Basin Optimum Management Program, 2018)
Treated water is distributed to CDA’s member agencies which include the City of Chino, City of Chino Hills, City of Norco, City of Ontario, Inland Empire Utilities Agency, Jurupa Community
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Services District, Santa Ana River Water Company, and Western Municipal Water District which provide water service within Riverside County and San Bernardino County. The OBMP included a long-term goal to produce 40,000 AF from the Chino Basin annually for the purpose of groundwater cleanup and hydraulic control of contaminant migration into the Santa Ana River, and to prevent loss of beneficial water for use in the basin.
A portion of the production is in-lieu of those CDA member agencies producing an equal amount of groundwater from their own groundwater wells using their individual water rights. An additional portion of the production is temporarily assigned as “controlled overdraft.” Pursuant to the Chino Basin Judgment, a total of 200,000 AF was authorized for controlled overdraft between the period of 1978 through 2017. In 2007, the Peace II Agreement was adopted to establish measures for achieving hydraulic control of the Chino Basin. One of the measures put forth included increasing the authorized controlled overdraft to 600,000 AF. This is a 400,000 AF increase from the original 200,000 AF authorized in the Chino Basin Judgment and is available for utilization until December 31, 2030, per the Peace II Agreement. For the balance of the production, the Chino Basin Watermaster levies an annual Replenishment Assessment to purchase replenishment water to replace that overproduced water. Each of CDA’s member agencies is responsible for paying a Replenishment Assessment for their purchases in excess of their respective water rights allocated to the program.
6.1.3 Water Facilities Authority
The City purchases treated, imported water supplies from WFA. Over the past ten years, the City has purchased an average of 3,902 AFY from WFA. The City’s purchases in 2025 and projected purchases from WFA over the next 25 years, in five-year increments, are provided in Table 6-9.
6.1.3.1 Agreement
The City purchases treated, imported surface water from WFA through the “Second Revised and Restated Installment Purchase Agreement Relating to Water Facilities Authority Water Treatment Plant and Refunding of Outstanding Refunding Certificates of Participation, September 1, 1997” contract between the City and WFA (see Appendix G). On February 19, 1980, WFA was formed under a JPA to acquire and construct facilities to supply and distribute potable water to its member agencies. WFA’s service area is located within Chino Basin’s boundaries in the western portion of San Bernardino County. WFA’s member agencies include the Cities of Chino, Chino Hills, Ontario, Upland, and the Monte Vista Water District. The area which receives water supplies from WFA is approximately 148 square miles.
WFA purchases untreated imported water from MWD of Southern California through Inland Empire Utilities Agency. WFA owns and operates the Agua de Lejos Treatment Plant located in the City of Upland. The Agua de Lejos Treatment Plant is a conventional surface water treatment facility that treats and disinfects imported water supplies. The Agua de Lejos Treatment Plant began operating in 1988 and has a treatment capacity of 81 MGD. The City has rights to 0.5 MGD of the Agua de Lejos supply.
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6.1.4 City of Ontario
The City has purchased water supplies from the City of Ontario and the City of Upland through an emergency intertie. Purchases from Ontario and Upland are not a part of the City’s normal supply plan and are not included in the supply projections.
6.1.5 Surface Water
The City does not directly use surface water to meet its water demands.
6.2 Stormwater
The City does not directly use stormwater to meet its water demands.
6.3 Wastewater and Recycled Water
6.3.1 Wastewater Collection, Treatment, and Disposal
Wastewater generated by the City is treated by IEUA. IEUA provides sewage utility services to seven contracting agencies including the Cities of Chino, Chino Hills, Fontana, Montclair, Ontario, Upland, and Cucamonga Valley Water District. Wastewater is collected within the City’s local sewer collection system. The City’s local sewers tie into IEUA’s regional trunk sewers, including 90 miles of regional sewage interceptors. The regional sewer lines deliver wastewater to one or more regional plants owned by IEUA for treatment. IEUA owns and operates five regional water recycling plants:
• Regional Water Recycling Plant No. 1 (RP‐1) has a treatment capacity of 44 MGD. • RP-2 does not have any liquid treatment processes and does not produce any recycled water.
• RP-4 has a treatment capacity of 14 MGD.
• RP-5 has a treatment capacity of 15 MGD.
• Carbon Canyon Water Recycling Facility (CCWRF) has a treatment capacity of approximately 9.5 MGD.
Wastewater is treated through various processes including preliminary screening, grit removal, primary clarification, secondary treatment, tertiary treatment, dechlorinating, solids thickening, anaerobic digestion, and dewatering. With the exception of RP-2, the regional plants can produce tertiary‐treated, Title 22‐quality recycled water.
The locations of IEUA’s regional plants are provided in Figure 6-3 below. Wastewater collected by the City in 2025 is provided in Table 6-2, and wastewater treatment and end uses is provided in Table 6-3.
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Figure 6-3- Location of IEUA Regional Water Recycling Plants
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Table 6-2- Wastewater Collected Within Service Area in 2025 Wastewater Collection Recipient of Collected Wastewater Name of Wastewater
Collection Agency
Wastewater Volume Metered or
Estimated?
Volume of
Wastewater
Collected from
UWMP Service
Area 2025
Name of Wastewater
Treatment Plant
(WWTP) and Place ID
Number
Is WWTP Located
Within UWMP Area?
IEUA Estimated 3,453
IEUA Carbon Canyon
WWRF, Place ID
259184
Yes
IEUA Estimated 0
IEUA Carbon Canyon
WWRF, Place ID
259184
Yes
IEUA Estimated 3,187
IEUA Carbon Canyon
WWRF, Place ID
259184
Yes
Total Wastewater Received from UWMP Service Area in 2025: 6,641 Note: Row 2 and 3 of table describe facility RP-2 and RP-5 respectively.
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Table 6-3- Wastewater Treatment and End Uses in 2025
Wastewater
Treatment
Plant Name
and Place ID
Number
Does This
Plant Treat
Wastewater
Generated
Outside the
UWMP Service
Area?
2025 Volume
of Wastewater
Received from
UWMP Service
Area
(As Reported
in Submittal
Table 6-2 R)
Total
2025
Volume
of Water
Treated
2025 Outcomes of Treated Wastewater
Water
Recycled
Within
UWMP
Service
Area
Water
Recycled
Outside of
UWMP
Service
Area
Effluent
Discharge
that is not a
Permitted
Recycled
Water Use
Required
Discharge
for
Instream
Flow
Delivered
to
Another
Entity for
Additional
Treatment
Volume Volume Volume Volume Volume
Name
of
other
entity
IEUA Carbon
Canyon
WWRF,
Place ID
259184
Yes 3,453 3,453 1,806 480 1,168
IEUA Carbon
Canyon
WWRF,
Place ID
259184
Yes 0 0 0 0 0
IEUA Carbon
Canyon
WWRF,
Place ID
259184
Yes 3,187 3,187 1,702 439 1,047
Total: 6,640 6,640 3,508 918 2,215
Note: Row 2 and 3 of table describe facility RP-2 and RP-5 respectively.
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6.3.2 Recycled Water System
The City’s recycled water supplies are produced by IEUA. Over the past ten years, recycled water demands within the City have averaged approximately 5,238 AFY.
IEUA owns and operates the CCWRF, which is located within the City and produces recycled water serving Chino and other IEUA member agencies. The City purchases recycled water from IEUA and distributes it through its recycled water system to eligible customers.
Recycled water within the City is primarily used for industrial, landscape irrigation, agricultural, and construction purposes. The City began delivering recycled water in FY 1998-1999 and has expanded its recycled water distribution system since development of The Preserve residential community, College Park with new communities, and the conversion of potable water customers to recycled water over time in coordination with IEUA.
6.3.2.1 Recycled Water Demand and Projected Use
The City uses recycled water for industrial, landscape irrigation, agricultural, and construction purposes and continues to expand recycled water service where feasible. Planned expansions include extending service to additional parks, schools, and commercial landscape areas and retrofitting existing irrigation systems to accommodate recycled water.
Projected recycled water deliveries are based on historical use and anticipated system expansions. Table 6-9 presents current and projected recycled water deliveries through the planning horizon.
The recycled water supply projections shown in Table 6-4 are equal to the City’s projected recycled water demand, and IEUA has confirmed that sufficient supply is expected to be available to meet these future direct recycled water demands.
The City’s projected recycled water demands over the next 25 years, in five-year increments, are provided in Table 6-9. Table 6-5 compares the 2020 UWMP projected recycled water use for 2025 to the actual 2025 recycled water use.
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Table 6-4- Recycled Water Direct Beneficial Uses - Retail Name(s) of Facility/ies Producing (Treating)
the Recycled Water (OPTIONAL): IEUA
Name of Supplier Operating the Recycled
Water Distribution System (OPTIONAL): Chino
Potential Recycled Water Use
Volumes
Use Type
Potable or
Non-
Potable
Additio
nal
Informa
tion
2025 2030 2035 2040 2045 2050
Agricultural
irrigation
Non-
potable
1,223 1,450 1,300 1,100 900 700
Landscape
irrigation
Non-
potable
2,166 2,369 2,615 2,887 3,188 3,520
Industrial use Non-
potable 19 21 23 26 28 31
Groundwater
recharge Indirect
Potable Reuse (IPR)
2,151 2,375 2,622 2,895 3,196 3,529
Other (Description
Required)
Non-
potable
Hydrant
meter 96 100 105 110 115 120
Subtotal Potable
Subtotal Non-Potable 3,504 3,940 4,043 4,123 4,231 4,371 Total 5,655 6,314 6,665 7,018 7,427 7,900
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Table 6-5- 2020 UWMP Recycled Water (RW) Projection Compared to 2025 Actual - Retail Use Type 2020 Projection for 2025 2025 Actual Use
Agricultural irrigation 2,197 1,223
Landscape irrigation (exc golf courses) 2,302 2,166
Industrial reuse 19
Groundwater recharge (IPR) 2,151
Other (Description Required) 96
Total: 4,500 5,655
6.3.2.2 Actions to Encourage and Optimize Future Recycled Water Use The City plans to continue to increase delivery capacity and expand the recycled water system to serve additional customers. Any additional recycled water supplies that can offset imported water purchases will make projects more viable. Consequently, the economic value of a recycled water system continues to increase. The City is evaluating potential methods, including the viability of making conversion to recycled water mandatory for those customers with non- potable supplies that are in proximity to an existing or planned recycled water pipeline, to expand future recycled water use. These potential methods are tabulated in Table 6-6 but expected increases in recycled water use are unknown at this time.
Table 6-6- Methods to Encourage Future Recycled Water Use Name of Action Description Planned Implementation
Year
Expected Increase in
Recycled Water Use
Retrofits Retrofit landscape
irrigation systems Ongoing 0
Recycled Water
Distribution System
Expansion
Expand existing
recycled water
distribution system
Ongoing 0
Total 0
Unit Conversion to AF
6.4 Desalinated Water Opportunities
The City purchases desalinated brackish groundwater from CDA as described in Section 0.
Additional production of desalinated brackish groundwater from the Chino Basin is not anticipated since there are no additional regulatory or judicial drivers for desalination outside of the current scope of CDA, and new production from the Chino Basin could be placed where water quality is favorable.
Desalination of ocean water is not practical currently due to distance from the ocean.
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6.5 Water Exchanges and Transfers
6.5.1 Exchanges – Dry Year Yield Program
The DYYP is a groundwater storage and recovery program where supplemental water is stored in the Chino Basin during surplus years and recovered in dry years in-lieu of imported water from MWD through IEUA. The DYYP allows maximum use of imported water supplies available during wet years and stored groundwater in the Chino Basin during dry years. The DYYP can store up to 100,000 AF with maximum replenishment of 25,000 AFY and maximum extraction of 33,000 AFY. At the end of FY 2024-2025, there was approximately 64,000 AF within the DYYP account. The agreement that authorized the DYYP will expire in 2028 and is not planned to be extended, so it is anticipated that MWD will recover all its water stored under the DYYP Program by 2028.
When the City is required to extract MWD’s stored water, MWD pays for the operation and maintenance costs, and the City pays MWD (through IEUA) the full-service water rate. The City can use the DYYP facilities to meet its normal water demands during other periods but is responsible for the cost of well operation and maintenance.
The program allows the City to be less reliant upon imported water supplies. The additional groundwater capacity allows the City to increase the percentage of groundwater supply used to meet peak demands.
6.5.2 Transfers
The City may assign, lease, or sell rights to produce Chino Basin Water per the Chino Basin Peace Agreement, but currently has no active transfer programs.
6.5.3 Emergency Interties
The City has emergency interties with other water agencies that provide for short-term emergency water supplies. Emergency 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. 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 has emergency interties with neighboring water agencies that may be utilized in the event of an isolated interruption of water supply and would serve to facilitate mutual aid. Such interties are currently between the City’s water system and the water systems owned and operated by the City of Ontario and the City of Upland via WFA. To further increase system reliability, the City may establish additional emergency interties with neighboring water agencies’ systems, either directly or indirectly via WFA and/or CDA.
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6.6 Supply from Storage
Supply from storage refers to water that was previously stored and later recovered for use during the reporting year. This category applies only to water recovered from its storage accounts in the Chino Basin, which are part of the agency’s overall Chino Basin groundwater supplies and are included in the groundwater supply description and projections.
To avoid double counting, only water that was placed into storage in a prior year and recovered during the reporting year is reported as supply from storage. If water is placed into storage and then recovered within the same reporting year, it is not reported as supply from storage because it would already be counted under its original source (for example, purchased or imported water).
6.7 Future Water Projects
The City has completed significant groundwater treatment capacity improvements in recent years, including expansion of the Eastside Water Treatment Facility and construction of the State Street Water Treatment Plant. The additional treatment capacity is reflected in the City’s existing baseline groundwater supply and is incorporated into the Chino Basin supply projections presented in this Plan.
Looking forward, the City is planning additional groundwater supply improvements, including the development of new production wells and associated conveyance facilities. Any incremental production capacity associated with these future wells will support long-term system reliability and is incorporated, as applicable, into the groundwater supply projections included in the projections in Table 6-7.
City of Chino
2025 Urban Water Management Plan | 6-18
Table 6-7- Expected Future Water Supply Projects or Programs - Retail Name of
Future Projects
or Programs
Joint Project with
other suppliers?
Additional
Description
Potable
or
Non-
Potable
Planned
Implementation
Year
Planned
for Use
in Year
Type
Expected
Increase
in Water
Supply
to
Supplier
Drop
Down
List
(yes/no)
If Yes,
Supplier
Name
State Street
Water
Treatment Plant
No Potable 2026 6,452
AFY
Well 17 No Potable 2026 1,774
AFY
Well 16 No Potable 2026 1,452
AFY
Well 11 No Potable 2026 2,742
AFY
6.8 Summary of Historical Production and Future
Supplies
As discussed in Section 6, the City’s water supply sources consist of:
• Groundwater from the Chino Basin.
• Purchased potable water from CDA.
• Purchased treated imported from WFA.
• Recycled water from IEUA.
A tabulation of the City’s water supplies in 2025 is provided below in Table 6-8.
City of Chino
2025 Urban Water Management Plan | 6-19
Table 6-8- 2025 Water Supplies - Retail
Water Supply Additional Description
(as needed)
2025
Potable or
Non-
Potable
Actual
Volume
Total
Entitlement
(optional)
Groundwater (not
desalinated) Chino Basin Potable
Purchased or Imported
Water CDA Purchase Potable 5,086
Purchased or Imported
Water WFA Purchase Potable 4,052
Recycled Water IEUA Purchase Non-
Potable 3,508
Subtotal Potable 15,324
Subtotal Non-Potable 3,508
Total 18,832
Anticipated future supply use through 2050 is presented in Table 6-9. The reliability of these sources of supply is addressed in Section 7.2.3, including during normal years, single dry years, and five-consecutive year droughts.
6,186
City of Chino
2025 Urban Water Management Plan | 6-20
Table 6-9- Projected Water Supplies - Retail
Water Supply Projected Water Supply
Supply
Additional
Detail on
Water
Supply
Potable
or Non-
Potable
(after
treatment
if
treated)
2030 2035 2040 2045 2050
(opt)
Groundwater
(not
desalinated)
Chino
Basin Potable 7,669 7,790 8,102 8,573 9,171
Purchased or
Imported
Water
CDA
Purchase Potable 5,000 5,000 5,000 5,000 5,000
Purchased or
Imported
Water
WFA
Purchase Potable 3,902 3 ,200 2 ,500 1 ,800 1 ,200
Recycled
Water
IEUA
Purchase
Non-
Potable 6,314 6,665 7,018 7,427 7,900
Subtotal Potable 16,571 16,692 17,004 17,475 18,073
Subtotal Non-Potable 6,314 6,665 7,018 7,427 7,900
Total: 22,885 23,357 24,022 24,902 25,973
The City’s projected reliable water supplies are described in order of reliability and relative contribution to the overall supply portfolio.
Chino Basin Groundwater is the City’s primary and most reliable water supply. The Basin is adjudicated and groundwater production is not subject to a fixed annual extraction limit. When extractions are above the agency’s rights, it triggers a replenishment obligation (see Section
6.1.1.3). Groundwater is projected to meet the majority of the City’s total water demand and provides operational flexibility to address variability in other supplies.
Purchases from CDA are available to the City pursuant to established agreements that define the City’s share of desalter production. CDA typically produces a fixed amount of water annually, and the City is under a take-or-pay obligation for this supply. CDA is a reliable and constant component of the City’s portfolio, subject to uncommon operational and basin conditions.
Purchases from WFA are typically available in normal years. There is no long-term agreement establishing a fixed entitlement between the City and WFA, and availability is dependent on City of Chino
2025 Urban Water Management Plan | 6-21
MWD’s supply reliability. MWD’s UWMP reinforces that supplies are available for member agencies during normal years. The variability of imported water supplies in dry years is discussed in Section 7.
Recycled water continues to be used to meet non-potable demands and reduces the need for potable supplies, but it represents a smaller percentage of the City’s total water portfolio.
In the event that purchased water supplies from CDA or WFA are reduced or unavailable, the City has the ability to increase groundwater production from the Chino Basin, consistent with replenishment requirements. This structure provides the City with flexibility and supports the conclusion that sufficient supplies are available to meet projected demands throughout the planning horizon.
6.9 Climate Change Effects
Climate change has the possibility of impacting the availability of planned water supplies, particularly during a drought period. Section 0 describes climate change considerations that may affect future demand and supply sources.
Chino’s projected use of imported water incorporates MWD’s UWMP, which considers climate change to determine the future availability of imported water in dry, wet, and normal years.
While climate change is projected to decrease normal year imported water supplies in the future, the MWD UWMP affirms that sufficient imported water supplies are available to meet MWD member agency demands during normal years.
Climate change may impact future local precipitation which may lead to reduced natural recharge of local groundwater basins. Despite this, the Chino Basin is proactively managed to prevent pumpers from needing to reduce supplies. The Chino Basin Watermaster and pumpers participate in the OBMP and participate in and fund recharge efforts, including recycled water, which is resilient to climate change.
Chino has a flexible supply portfolio that includes groundwater, imported water, and recycled water. This diverse water supply portfolio helps the City adapt to different climate change impacts.
6.10 Energy Use
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 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 5,335,320 kilowatt-hours (kWh) during FY 2024- 2025. Although the total energy consumption reported includes electricity usage for general City of Chino
2025 Urban Water Management Plan | 6-22
administration (e.g., at City Hall), 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 15,324 AF during FY 2024-2025 and is consistent with the total volume of water provided in Table 4-1.
The total energy intensity associated with the City’s water management processes is estimated at 348 kWh/AF. The energy intensity data and calculations based on the “total utility approach” are provided in Table 6-10 below.
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.
Table 6-10- Total Utility Approach for Single Water Delivery Products - Energy Reporting Water Delivery
Product
drop down list
(If delivering
more than one
type of product
use Table O-1C)
Retail Potable
Deliveries
Only for Water Delivery Products Under the Urban
Water Supplier's Operational Control
Start Date of
Reporting Period 7/1/2024
Sum of All Water
Management
Processes
Non-Consequential Hydropower
End Date of
Reporting Period 6/30/2025
Is upstream
embedded
energy in the
values reported?
Units of Measure
for Water AF Total Utility Hydropower Net Utility
Volume of Water Entering Process 15,324 - 15,324
Energy Consumed (kWh) 5,335,320 - 5,335,320
Energy Intensity (kWh/vol. converted
to MG) 1,068 - 1,068
2025 Urban Water Management Plan | 7-1
7 Water Service Reliability
This section describes water service reliability through 2050. As required by the UWMP Act, the assessment must compare total projected water supply and demands over the next 20 years in five -year increments under normal, single dry water years, and multip le dry water years. This section also includes the drought risk assessment (DRA), which provides a snapshot of the anticipated surplus or deficit if a drought were to occur in the next five years.
IN THIS S ECTIO N
• Water Service Reliability
Assessment
• Drought Risk Assessment
City of Chino
2025 Urban Water Management Plan | 7-2
7.1 Introduction
Water service reliability is determined based on the security of water supply and water infrastructure. Evaluating the water service reliability is critical for water management as it can help identify potential problems before these happen. Water managers can then take proactive steps to mitigate shortages by encouraging water use efficiency, securing new water supplies, and/or investing in infrastructure.
7.2 Water Service Reliability Assessment
Chino’s 2025 UWMP water service reliability assessment and DRA results indicate that no water shortages are anticipated within the next 25 years under normal, single dry, and multiple dry water years.
7.2.1 Service Reliability - Constraints on Water Sources The City’s sources of supplies consist of groundwater pumped from the Chino Basin; treated groundwater from the Chino Basin produced by CDA; imported surface water from MWD (through IEUA) which is treated by WFA; and recycled water purchased from IEUA as described in Section 6.
Groundwater from Chino Basin has been previously impacted by contamination. However, the City has developed and implemented appropriate treatment which has been approved by the State Water Board. These groundwater supplies are considered reliable from a water quality and quantity standpoint.
Imported water from MWD through IEUA is untreated surface water. Water quality from MWD relating to supply reliability is addressed separately in MWD’s 2025 UMWP.
7.2.2 Service Reliability – Year Type Characterization
In accordance with CWC Section 10635(a), every urban water supplier must provide their expected water service reliability for a normal year, single dry year, and five consecutive dry years for 2030, 2035, 2040, 2045, and optionally 2050.
7.2.2.1 Types of Years
DWR defines these years as:
• Normal Year: This condition represents a single year or an averaged range of years that most closely represents the average water supply available. An average was used for this analysis.
• Single Dry Year: The single dry year is recommended to be the year that represents the lowest water supply available.
• Five-Consecutive Year Drought: The driest five-year historical sequence for the supplier, which may be the lowest average water supply available for five years in a row.
City of Chino
2025 Urban Water Management Plan | 7-3
It is anticipated that future demands and supply will fluctuate from average conditions at the rate they did during historic dry conditions. To determine the percentage of demand fluctuation in dry periods, historic rainfall and production were assessed to determine average and dry years. The percentage differences in production for dry years compared to average are shown in Table 7-1.
Table 7-1- Water Supply Reliability Assessment - Retail Demand & Supply Changes from Average if
Year Type Repeats
Year Type Base Year Volume Available % of Average
2012-2025 14,728 100%
Single-Dry Year 2018 14,377 98%
Consecutive Dry
Years 1st Year 2012 15,441 105%
Consecutive Dry
Years 2nd Year 2013 15,852 108%
Consecutive Dry
Years 3rd Year 2014 16,225 110%
Consecutive Dry
Years 4th Year 2015 14,578 99%
Consecutive Dry
Years 5th Year 2016 12,866 87%
7.2.3 Water Service Reliability – Supply and Demand Comparison Results of the water supply and demand analysis for normal, single dry, and five-year consecutive drought are shown in the following sections. Based on reliability analyses in MWD, IEUA, CDA, and WFA UWMPs, and Chino Basin rights and management practices described in Sections 6.1 and 7.2.4, Chino expects to meet demands under all water year scenarios and continues to promote conservation to ensure reliability throughout the future.
7.2.3.1 Water Service Reliability – Normal Year
As described previously, Chino’s supply portfolio will be managed to meet demand as shown in Table 7-2.
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2025 Urban Water Management Plan | 7-4
Table 7-2- Normal Year Supply and Demand Comparison - Retail 2030 2035 2040 2045 2050
Supply totals
(autofill from Submittal Table
6-9 R)
16,571 16,692 17,004 17,475 18,073
Use totals
(autofill from Submittal Table
4-2 R)
16,571 16,692 17,004 17,475 18,073
Surplus/Shortfall 0 0 0 0 0
7.2.3.2 Water Service Reliability – Single-Dry Year
Table 7-3 summarizes Chino’s projected demands and supply over the next 25 years in five- year increments during single dry years. Dry year demands are expected to change from average demands by the percentage of average shown in Table 7-1 and are projected to be met by Chino’s available supply.
Table 7-3- Single Dry Year Supply and Demand Comparison – Retail 2030 2035 2040 2045 2050
Supply Totals 16,177 16,295 16,599 17,059 17,643
Use Totals 16,177 16,295 16,599 17,059 17,643
Surplus/(shortfall) 0 0 0 0 0
7.2.3.3 Water Service Reliability – Five Consecutive Dry Years Table 7-4 summarizes Chino’s projected demands and supply over the next 25 years in five- year increments during five consecutive years of drought conditions. Dry year demands are expected to change from average demands by the percentages of average shown in Table 7-1 and are projected to be met by Chino’s available supply.
City of Chino
2025 Urban Water Management Plan | 7-5
Table 7-4- Five Consecutive Dry Years Supply and Demand Comparison – Retail 2030 2035 2040 2045 2050
First Year
Supply Totals: 17,374 17,966 18,733 17,298 15,789
Use Totals: 17,374 17,966 18,733 17,298 15,789
Surplus/(shortfall) 0 0 0 0 0
Second Year
Supply Totals: 17,836 17,966 18,302 18,809 19,453
Use Totals: 17,836 17,966 18,302 18,809 19,453
Surplus/(shortfall) 0 0 0 0 0
Third Year
Supply Totals: 18,256 18,389 18,733 19,252 19,911
Use Totals: 18,256 18,389 18,733 19,252 19,911
Surplus/(shortfall) 0 0 0 0 0
Fourth Year
Supply Totals: 16,403 16,523 16,831 17,298 17,890
Use Totals: 16,403 16,523 16,831 17,298 17,890
Surplus/(shortfall) 0 0 0 0 0
Fifth Year
Supply Totals: 14,476 14,582 14,855 15,266 15,789
Use Totals: 14,476 14,582 14,855 15,266 15,789
Surplus/(shortfall) 0 0 0 0 0
7.2.4 Description of Management Tools and Options
As noted in Section 6, the Chino Basin is managed by the Chino Basin Watermaster. During the period of management under the Judgment, significant drought events have occurred. In each drought cycle, the Chino 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 Chino Basin for adequate supply over the next 25 years under single dry years and a five consecutive year drought periods.
While Chino does not anticipate any shortfall during drought periods, the City is committed to supporting the water reliability of the region overall. Some of the management tools and options City of Chino
2025 Urban Water Management Plan | 7-6
available to Chino for increasing its water supply and reducing water demand have been described within other sections of this document. These tools and options include prioritizing maximizing the use of local water resources and minimizing the need for imported water due to the vulnerability of MWD imported water to climate change impacts such as changing precipitation patterns. Chino also has a robust water use efficiency program detailed in Section 9 that identifies the most effective water use efficiency measures and partnerships for implementation in the region. Additional tools available to the region include water agency interconnections and mutual aid agreements with other local agencies.
7.3 Drought Risk Assessment
CWC Section 10635 (b) requires a DRA. The DRA provides a quick snapshot of the anticipated surplus or deficit if a five-consecutive year drought were to occur in the next five years. The DRA informs the WSCP and can be modified or updated outside of the UWMP five-year plan cycle, so a description of the data, methodology, and basis for shortage conditions must be included in this 2025 UWMP. The DRA evaluates each water supply’s reliability and compares available water supplies and projected demands during a five-consecutive dry years scenario.
This short-term analysis can help water suppliers foresee undesired risks, such as upcoming shortages, and provide time to evaluate and implement the necessary response actions needed to mitigate shortages in a less impactful manner to the community and environment.
7.3.1 Data, Methods, and Basis for Water Shortage Condition The DRA builds on the water service reliability analysis from Section 7, which incorporated assessment of historical consumption data by customer class, populated from billing records, and historical supply data by source from production reports. Based on this data, historical demand has never exceeded available supply. For this DRA analysis, normal year demand conditions and five-consecutive year drought supply conditions were considered for 2026-2030.
7.3.2 DRA Water Source Reliability
As described previously, Chino does not anticipate any supply shortages within the next five years as shown in Table 7-5.
City of Chino
2025 Urban Water Management Plan | 7-7
Table 7-5- Five-Year Drought Risk Assessment - Retail
2026 Total
Total Water Use: 16,328
Total Supplies: 16,328
Surplus/Shortfall w/o WSCP Action 0
2027 Total
Total Water Use: 17,031
Total Supplies: 17,031
Surplus/Shortfall w/o WSCP Action 0
2028 Total
Total Water Use: 17,706
Total Supplies: 17,706
Surplus/Shortfall w/o WSCP Action 0
2029 Total
Total Water Use: 16,156
Total Supplies: 16,156
Surplus/Shortfall w/o WSCP Action 0
2030 Total
Total Water Use: 14,476
Total Supplies: 14,476
Surplus/Shortfall w/o WSCP Action 0
2025 Urban Water Management Plan | 8-1
8 Water Shortage Contingency Plan
The Water Shortage Contingency Plan (WSCP) is a detailed plan for how the City of Chino (Chino or the City) intends to act in the case of an actual water shortage condition. This allows for management of a shortage with predictability and
accountability.
IN THIS S ECTIO N
• Overview of WSCP Components
• Water Supply Reliability Analysis
• Annual Water Supply and
Demand Assessment
• Six Standard Water Shortage
Levels
• Shortage Response Actions
• Communication Protocols
• Compliance, Enforcement, and
Legal Authorities
• Implementation
City of Chino
2025 Urban Water Management Plan | 8-2
8.1 Introduction
The California Water Code (CWC) Section 10632 requires that every urban water supplier shall prepare and adopt a standalone WSCP as part of its Urban Water Management Plan (UWMP).
The WSCP is developed independently of Chino’s 2025 UWMP and can be amended, as needed, without amending the UWMP.
The WSCP is a strategic plan that Chino uses to prepare for and respond to foreseeable and unforeseeable water shortages. A water shortage occurs when the water supply available is insufficient to meet the normally expected customer water use at a given point in time. A shortage may occur due to a number of reasons, such as water supply quality changes, climate change, drought, regional power outage, and catastrophic events (e.g., earthquake).
Additionally, the State may declare a statewide drought emergency and mandate that water suppliers reduce demands. The WSCP serves as the operating manual that Chino will use to prevent catastrophic service disruptions through proactive, rather than reactive, mitigation of water shortages.
The WSCP provides a process for an annual water supply and demand assessment and structured steps designed to respond to actual conditions. This level of detailed planning and preparation provides accountability and predictability and will help Chino maintain reliable supplies and reduce the impacts of any supply shortages and/or interruptions.
8.2 Overview of WSCP Components
The CWC establishes several prescriptive elements that must be included in a retail water supplier’s WSCP. Each element and its location within the WSCP is described below.
Water Supply Reliability Analysis: Summarizes Chino’s water supply analysis and reliability and identifies any key issues that may trigger a shortage condition.
Annual Water Supply and Demand Assessment Procedures: Describes the key data inputs, evaluation criteria, and methodology for assessing the system’s reliability for the coming year and the steps to formally declare any water shortage levels and response actions.
Shortage Stages: Establishes water shortage levels to clearly identify and prepare for shortages.
Shortage Response Actions: Describes the response actions that may be implemented or considered for each stage to reduce gaps between supply and demand.
Communication Protocols: Describes communication protocols under each stage to ensure customers, the public, and government agencies are informed of shortage conditions and requirements.
Compliance and Enforcement: Defines compliance and enforcement actions available to administer demand reductions.
City of Chino
2025 Urban Water Management Plan | 8-3
Legal Authorities: Lists the legal documents that grant Chino the authority to declare a water shortage and implement and enforce response actions.
Financial Consequences of WSCP Activation: Describes the anticipated financial impact of implementing water shortage stages and identifies mitigation strategies to offset financial burdens.
Monitoring and Reporting: Summarizes the monitoring and reporting techniques to evaluate the effectiveness of shortage response actions and overall WSCP implementation. Results are used to determine if additional shortage response actions should be activated or if efforts are successful and response actions should be reduced.
WSCP Refinement Procedures: Describes the factors that may trigger updates to the WSCP and outlines how to complete an update.
Special Water Feature Distinctions: Identifies exemptions for decorative features aside from pools and spas.
Plan Adoption, Submittal, and Availability: Describes the process for the WSCP adoption, submittal, and availability after each revision.
The WSCP was prepared in conjunction with Chino’s 2025 UWMP and is a standalone document that can be modified as needed. The document is compliant with the CWC Section 10632 and incorporates guidance from the Urban Water Management Plan Guidebook 2025 (Guidebook) (Department of Water Resources, 2025).
8.3 Water Supply Reliability Analysis
The City’s sources of supply were discussed in Section 6 of the 2025 UWMP and consist of groundwater from the Chino Basin, purchased groundwater from Chino Basin Desalter Authority (CDA), imported water from Metropolitan Water District of Southern California (MWD) (through Inland Empire Utilities Agency (IEUA)) which is treated by Water Facilities Authority (WFA), and recycled water purchased from IEUA. The Chino Basin is adjudicated, and groundwater supplies are managed.
The reliability of the various sources of supply is discussed in Section 7 of the City’s UWMP.
Based on the adjudication provisions in the Chino Basin, the City can produce groundwater in excess of its rights, provided the City pays assessments to the Chino Basin Watermaster, which are used to purchase water to replenish the Chino Basin.
Imported water supplies (both treated and untreated) may be impacted in the event MWD implements its Water Supply Allocation Plan (WSAP) due to a water supply shortage.
As documented in Section 7 of the City’s 2025 UWMP, the City’s water supplies are projected to be sufficient to meet planned demands under average and dry year conditions but may be constrained under extended drought or other supply disruption scenarios. These constraints may result from a combination of factors, including but not limited to reduced imported water allocations, declining groundwater availability, regulatory restrictions, or operational limitations.
City of Chino
2025 Urban Water Management Plan | 8-4
For purposes of this WSCP, the City has evaluated the conditions under which supply shortfalls may occur and identified objective triggers that reasonably indicate increasing levels of water supply stress as described in Section 8.4.
8.4 Annual Water Supply and Demand Assessment
Since July 1, 2022, the City has been 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 WSCP) for the current year and the upcoming (potential single dry) year. The City also assesses information regarding anticipated shortages, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the City’s WSCP.
For each Annual Assessment, the City plans to prepare a preliminary assessment which evaluates the adequacy of its water supplies for the current and upcoming years. The preliminary assessment will include a review of water supplies for at least a single dry year.
The components of an Annual Assessment consist of the following:
• A written decision-making process.
• Key data inputs and assessment methodology.
8.4.1 Decision Making Process
The City produces groundwater from the Chino Basin as its primary source of water supply and this basin is managed on a Fiscal Year (FY) basis. Consequently, during the third quarter of each FY, 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 the City managers during the Spring of each year. If a new water shortage stage or new shortage response actions are required, a final draft of the Annual Assessment may be provided to City Council for review such that any recommended specific shortage response actions may be enacted. The final Annual Assessment will be provided to the California Department of Water Resources (DWR) no later than July 1 of each year.
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 supply resources are available to the City.
City of Chino
2025 Urban Water Management Plan | 8-5
8.4.2 Data Methodologies
The key data inputs and methodologies which will be evaluated by the City during the preparation of the preliminary 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: An assessment of each available water supply source will be conducted.
The assessment will include a quantification of each available water supply source based on review of current production capacities, historical production, UWMPs, and prior water supply studies (including Water Supply Assessments and/or Master Plans).
3. Unconstrained Water Demand: The potential unconstrained water demands during the current year and the upcoming (potential single dry) year, prior to any special shortage response actions, 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, Urban Water Supplier Monthly Reports, existing water shortage levels (see Section 8.5), and existing water conservation ordinances (see Section 9 of the City’s 2025 UWMP).
4. Planned Water Use for Current Year Considering Dry Subsequent Year: The water supplies available to meet the demands during the current year and the upcoming (potential single dry) year will be considered and identified for each source 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 water distribution system losses (see Section 4.2.3 of the City’s 2025 UWMP) 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 6.7 of the City’s 2025 UWMP), will be considered.
6. Other Factors: Additional local considerations, if any, which can affect the availability of water supplies will be described.
8.5 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 was designed to City of Chino
2025 Urban Water Management Plan | 8-6
incorporate six standard water shortage levels corresponding to progressive shortage 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. The required percentage reduction for each customer will be based on water usage during the same billing period in the last calendar year during which there were no declared water shortages, or as deemed appropriate by the City.
The City’s Ordinance No 2009-04 (“Water Conservation”), adopted in May 2009, and Ordinance No. 2015- 004 (“Additional Conservation Measures”), adopted in June 2015, previously established three (3) water shortage levels. A copy of Ordinance No 2009-04 and Ordinance No. 2015- 004 are linked in Appendix H. In accordance with the CWC, in which urban water suppliers are required to define six standard water shortage levels, the City has developed the crosswalk provided below that translates the City’s previously established shortage levels to the mandated standard shortage levels.
Figure 8-1- Corresponding Relationships Between Supplier's 2015 Shortage Levels and the 2025 WSCP Mandated Shortage Levels
Table 8-1 provides a description of the six water shortage levels and potential shortage response actions which may be triggered by a shortage in one or more of the City’s water supply sources, depending on the severity of the shortage and its anticipated duration.
The City will evaluate water shortage conditions on a case-by-case basis and determine which response actions are appropriate to maintain water supply reliability or mitigate potential impacts. In collaboration with its customers and regional water agencies, the City’s response to potential shortages may include increased public outreach, adjustments to water use efficiency programs, changes to typical operations, or promoting voluntary actions to reduce demands or explore additional supply options.
City of Chino
2025 Urban Water Management Plan | 8-7
Table 8-1- Water Shortage Contingency Plan Levels
Shortage Level
Percent
Shortage
Range
Shortage Response Actions
1 Up to 10%
Restaurants shall not use non-conserving dish spray valves.
Ornamental lakes or ponds shall not be filled or refilled with potable water, except to the extent needed to sustain aquatic life.
Outdoor irrigation only every other day from May 1 through September 30.
2 Up to 20%
In addition to Shortage Level 1; Outdoor irrigation of landscape with potable water will only be allowed every other day.
Commercial lodging establishments shall not launder towels and linen daily, except when specifically requested by their customer. 3 Up to 30%
In addition to Shortage Level 2; Potable water service will not be provided to new land development projects. Additional restrictions may be implemented as determined by the City, after notice to customers.
4 Up to 40% In addition to Shortage Level 3; Additional restrictions may be implemented as determined by the City, after notice to customers. 5 Up to 50% In addition to Shortage Level 4; Additional restrictions may be implemented as determined by the City, after notice to customers. 6 >50% In addition to Shortage Level 5; Additional restrictions may be implemented as determined by the City, after notice to customers.
8.6 Shortage Response Actions
Shortage response actions are dependent on the severity of a declared shortage level.
Response actions implement varying improvements and regulations of system infrastructure and operations, water supply augmentation, demand reduction initiatives, and other water use functions to conserve water supplies.
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8.6.1 Demand Reduction
The City has established 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’s water supply and corresponding water shortage level, regulations have been made to conserve water and reduce the shortage gap in normal supply levels. Many demand reduction actions are applicable to all levels of water shortages while others are exclusive to certain levels of shortage. The structure of demand reduction actions under a specific water shortage level are designed to strongly encourage those customers with high per capita usage to achieve proportionally greater reduction than those with low use. Violations of these demand reduction actions will be considered waste and an unreasonable use of water. Table 8-2 describes each demand reduction action and its effect on reducing the shortage gap.
The following activities are hereby prohibited at all times:
• Allowing irrigation water to run off into a gutter, ditch, drain, driveway, sidewalk, street, onto pavement, or other hard surface.
• Outdoor irrigation of landscape for more than fifteen minutes of watering per day per station. This restriction does not apply to landscapes that utilize drip irrigation systems. • Automated irrigation of landscape during the hours of 6:00 a.m. to 8:00 p.m. Customers are encouraged to avoid the use of sprinklers on windy days. Irrigation by handheld hoses with automatic shutoff nozzles, drip irrigation, or handheld buckets is permitted anytime.
• Outdoor irrigation of landscape on rainy days.
• Washing down hard or paved surfaces, including but not limited to sidewalks, walkways, driveways, parking areas, patios, and alleys, except when necessary to alleviate safety or sanitary hazards.
• Excess use, loss, or escape of water through breaks, leaks, or other malfunctions in the plumbing system or distribution system for any period of time after such escape of water should have reasonably been discovered and corrected.
• Washing of automobiles, trucks, trailers, boats, airplanes, and other types of mobile equipment, unless done with a handheld bucket or handheld hose equipped with a positive shutoff nozzle for quick rinses.
• Restaurants serving water to their customers, except when specifically requested by their customers.
• Operating a decorative water fountain or feature, built or installed after the adoption of this WSCP, that does not include re-circulated water.
• Operating a commercial car wash or laundry, built or installed after the adoption of this WSCP, that does not use re-circulated water.
• Operating a single-pass cooling system built or installed after the adoption of this WSCP.
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In addition to the permanent measures described above, additional restrictions are implemented during times of declared water shortage levels or declared water shortage emergencies:
• Cease irrigation of public roadway median turf landscape unless irrigated with recycled water.
• Irrigate only on Monday, Wednesday, Friday, and Saturday between the hours of 8:00p.m. and 6:00 a.m.
• No watering during rain events and for forty-eight (48) hours after rain events. • Restaurants to provide drinking water only upon request. • Hotels to provide notice to guests to select the option to not launder their towels and hotel linen daily.
Any landscaping that is installed on the site of a newly constructed building, or landscaping that is a part of a development project, shall only be irrigated through the use of drip and micro spray systems if potable water is used for irrigation. This requirement shall not apply to landscapes irrigated with recycled water.
Water Supply Shortage Level 1
• Restaurants shall not use non-conserving dish spray valves. • Ornamental lakes or ponds shall not be filled or refilled with potable water, except to the extent needed to sustain aquatic life.
• Outdoor irrigation of landscape with potable water will only be allowed every other day from May 1 through September 30.
• Additional restrictions may be implemented as determined by the City, after notice to customers.
Water Supply Shortage Level 2
• In addition to the restrictions identified in Water Supply Shortage Level 1, the following additional water conservation requirements apply:
• Outdoor irrigation of landscape with potable water will only be allowed every other day. • Hotels, motels, and other commercial lodging establishments shall not launder towels and linen daily, except when specifically requested by their customer. • Additional restrictions may be implemented as determined by the City, after notice to customers.
Water Supply Shortage Level 3
In addition to the restrictions identified in Water Supply Shortage Level 2, the following additional water conservation requirements apply:
• Potable water service will not be provided to new land development projects except under the following circumstances:
o A valid building permit has been issued for the project, or o The project is necessary to protect public health, safety, and welfare, or City of Chino
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o The applicant provides evidence that the project will include conservation offsets prior to the provision of new water service.
• Additional restrictions may be implemented as determined by the City, after notice to customers.
Water Supply Shortage Level 4
In addition to the restrictions identified in Water Supply Shortage Level 3, the following additional water conservation requirements apply:
• Potable water service will not be provided to new land development projects except under the following circumstances:
o A valid building permit has been issued for the project, or o The project is necessary to protect public health, safety, and welfare, or o The applicant provides evidence that the project will include conservation offsets prior to the provision of new water service.
• Additional restrictions may be implemented as determined by the City, after notice to customers.
Water Supply Shortage Level 5
In addition to the restrictions identified in Water Supply Shortage Level 4, the following additional water conservation requirements apply:
• Potable water service will not be provided to new land development projects except under the following circumstances:
o A valid building permit has been issued for the project, or o The project is necessary to protect public health, safety, and welfare, or o The applicant provides evidence that the project will include conservation offsets prior to the provision of new water service.
• Additional restrictions may be implemented as determined by the City, after notice to customers.
Water Supply Shortage Level 6
In addition to the restrictions identified in Water Supply Shortage Level 5, the following additional water conservation requirements apply:
• Potable water service will not be provided to new land development projects except under the following circumstances:
o A valid building permit has been issued for the project, or o The project is necessary to protect public health, safety, and welfare, or o The applicant provides evidence that the project will include conservation offsets prior to the provision of new water service.
• Additional restrictions may be implemented as determined by the City, after notice to customers.
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Table 8-2- Demand Reduction Actions
Shortage
Level Demand Reduction Actions
How much is this going to
reduce the shortage gap?
Additional
Explanation
or
Reference
Penalty,
Charge, or
Other
Enforcement?
1 Landscape - Restrict or
prohibit runoff from
landscape irrigation
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 acre-feet per
year (AFY).
Yes
1 Landscape - Limit landscape
irrigation to specific times
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 Other - Prohibit use of
potable water for washing
hard surfaces
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 Other - Customers must
repair leaks, breaks, and
malfunctions in a timely
manner
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 Other - Require automatic
shut-off hoses
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 Commercial, Industrial, and
Institutional (CII) -
Restaurants may only serve
water upon request
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 CII - Lodging establishment
must offer opt out of linen
service
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
1 Other - Prohibit vehicle
washing except at facilities
using recycled or
recirculating water
Collective reduction from all
Shortage Level 1 actions is
up to 1,726 AFY.
Yes
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Shortage
Level Demand Reduction Actions
How much is this going to
reduce the shortage gap?
Additional
Explanation
or
Reference
Penalty,
Charge, or
Other
Enforcement?
2 Other
Collective reduction from
Shortage Level 1 plus all
Shortage Level 2 actions is
up to 3,453 AFY.
All actions
under
Shortage
Level 1
Yes
3 Other
Collective reduction from
Shortage Level 2 plus all
Shortage Level 3 actions is
up to 5,179 AFY
All actions
under
Shortage
Level 2
Yes
3 Other - Prohibit use of
potable water for
construction and dust control
Collective reduction from all
Shortage Level 3 actions is
up to 5,179 AFY
Yes
4 Other
Collective reduction from
Shortage Level 3 plus all
Shortage Level 4 actions is
up to 6,905 AFY
All actions
under
Shortage
Level 3
Yes
5 Other
Collective reduction from
Shortage Level 4 plus all
Shortage Level 5 actions is
up to 8,632 AFY
All actions
under
Shortage
Level 4
Yes
6 Other
Collective reduction from
Shortage Level 6 actions is
greater than 8,632 AFY
All actions
under
Shortage
Level 5
Yes
8.6.2 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. 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 Section 6 of the City’s 2025 UWMP, the City’s sources of water supply include groundwater produced from the Chino Basin, purchased groundwater from CDA, imported water purchased from MWD (through IEUA) which is treated by WFA, and recycled water supplies provided by IEUA. As noted in Section 8.4, since July 1, 2022, the City City of Chino
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prepares and submits an Annual Assessment which will include a review of water supplies available to meet water demands for the current and upcoming years. In the event the City is currently in, or considers entering into, one of the standard water shortage levels identified in Section 8.5, the City will consider the water supply (augmentation) actions described below.
For each water shortage level discussed in Section 8.5, the City will consider supplementing its existing treated imported water supplies through increased production of groundwater supplies, to the extent possible.
As discussed previously, WFA’s and IEUA’s source of water supply is strictly imported surface water from MWD purchased through IEUA and treated at WFA’s treatment facility. WFA does not anticipate augmenting water supplies. IEUA is limited in its ability to implement water supply augmentation actions. IEUA’s supply augmentation actions are described in Table 8-3. MWD’s supply augmentation actions, described in MWD’s WSCP, capture the supply augmentation actions that are relevant to IEUA. To the extent possible, IEUA would coordinate with MWD and its other member agencies on supply augmentation projects during normal and shortage periods to continue expanding water reliability for the entire region.
Table 8-3- Supply Augmentation and Other Actions (DWR Table 8-3)
SHORTAGE
LEVEL
SUPPLY AUGMENTATION
METHODS AND OTHER
ACTIONS BY WATER SUPPLIER
HOW MUCH IS THIS
GOING TO REDUCE THE
SHORTAGE GAP?
ADDITIONAL
EXPLANATION OR
REFERENCE
1-6 MWD Supply Augmentation 0 to 100% of shortage
gap
Coordinate with MWD
and, if needed, purchase
supplemental supplies
from MWD
Due to previous critically dry conditions, MWD developed the WSAP whereby available supplies are equitably allocated to its member agencies, including IEUA. 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 retail demand. The ratio of MWD water supply drought allocation to local water supply will change based on the WSAP stage.
In addition to the WSAP, MWD describes supply augmentation actions in its 2025 UWMP, which is incorporated by reference. MWD’s primary first response to any gap between core supplies (from the State Water Project and Colorado River) and demand is to make optimal use of its supply augmentation options, consisting of drawing from flexible supply programs and storage reserves. MWD has developed and actively manages a portfolio of water supply programs including water transfer, storage, and exchange agreements. MWD pursues voluntary water transfer and exchange programs to help mitigate supply/demand imbalances and provide additional dry-year supply sources. In addition, MWD has developed significant storage capacity in reservoirs, conjunctive use, and other groundwater storage programs totaling approximately
6.0 million acre-feet (AF). Pursuant to MWD’s “Emergency Storage Objective,” updated in 2019, City of Chino
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approximately 750,000 AF of total stored water is emergency storage reserved by MWD for use in the event of supply interruptions. Based on MWD’s historical and on-going water supply and storage programs and management practices, the City will use up to the treated imported water supply made available MWD through IEUA in association with each of the standard water shortage levels identified in Section 8.5. City water demands will be addressed through increased use of the local groundwater supplies and implementation of demand reduction measures through various levels of actions.
The City will consider augmenting its existing water supplies through production of additional groundwater from the Chino Basin. As noted in Section 0 of the City’s 2025 UWMP, the Chino Basin is managed by the Chino Basin Watermaster. During the period of management under the Chino Basin Judgment, significant drought events have occurred. In each drought cycle, the Chino Basin has been managed to maintain water levels. Parties to the Chino Basin Judgment, including the City, are authorized to produce groundwater in excess of their rights subject to replenishment requirements. The City has ample production rights and does not anticipate or project that it will need to replenish due to production in excess of its production rights.
Groundwater quality is carefully monitored and managed by the Chino Basin Watermaster.
Treatment facilities and/or blend plans have been developed by water agencies to meet potable water standards and to prevent the spread of any groundwater contamination. Based on historical and ongoing management practices, the City will be able to continue relying on the Chino Basin for adequate supplies in response to each of the standard water shortage levels identified in Section 8.5.
8.6.3 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
8.6.2 describes the City’s water supply sources and water supply augmentation actions available. Section 8.6.1 describes the City’s standard water shortage levels and associated demand reduction measures. 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 8.4, beginning on July 1, 2022, the City prepares and submits an Annual Assessment which includes a review of the water supplies available to meet water demands for the current and upcoming years. Preparation of the Annual Assessment 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 Section 9 of the City’s 2025 UWMP), will be essential to the City in reducing water demands during any water shortage period. The operational changes the City will consider in addressing non-catastrophic water shortages on a short-term basis include the following:
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• 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.
8.6.4 Additional Mandatory Restrictions
The mandatory restrictions which are implemented by the City to reduce customer demands are discussed in Section 8.6.1. There are no additional mandatory restrictions planned at this time.
8.6.5 Emergency Response Plans
Catastrophic water shortages are incorporated in the City’s standard water shortage levels (identified in Section 8.5) and the associated demand reduction measures (described in Section
8.6.1). In addition to the water supply augmentation actions (Section 8.6.2) and potential operational changes (Section 8.6.3) 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 30, 2026, confirming the current RRA and ERP have been reviewed and updated. The City’s RRA certification was due by December 31, 2025, and the ERP certification was due by June 30, 2026.
The City’s RRA evaluates the vulnerabilities, threats, and consequences from potential hazards to the City’s water system. The City prepared its RRA (which is incorporated by reference) by evaluating the following items:
• Natural hazards and malevolent acts (i.e., all hazards). • Resilience of water facility infrastructure (including pipes, physical barriers, water sources and collection, treatment, storage, and distribution facilities, and electronic, computer, and other automated systems).
• Monitoring practices.
• Financial systems (e.g., billing systems).
• Chemical storage and handling.
• 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 City of Chino
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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 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, an earthquake, or a threat of contamination). The ERP also incorporates the results of the City’s RRA and includes the following:
• Strategies and resources to improve resilience, including physical and cybersecurity. • Plans and procedures for responding to a natural hazard or malevolent act. • Actions and equipment to lessen the impact of a natural hazard or malevolent act. • Strategies to detect natural hazards or malevolent act.
The City will review the ERP for procedures regarding the utilization of alternative water supply sources in response to water supply shortages, including during the standard water shortage levels. The City will also review applicable procedures described in the ERP regarding any necessary temporary shutdown of water supply facilities, including appropriate regulatory and public notifications.
8.6.6 Seismic Assessment and Mitigation Plan
The County of San Bernardino prepared a “Multi-Jurisdictional Hazard Mitigation Plan” which was approved by the Federal Emergency Management Agency (FEMA) in 2022. The County’s Multi-Jurisdictional Hazard Mitigation Plan identified methods to assess significant natural hazards (including earthquakes) affecting areas throughout San Bernardino County, and the mitigation strategies necessary to reduce risks, including seismic risk. The County’s Multi- Jurisdictional Hazard Mitigation Plan is available through the San Bernardino County website (Multi-Jurisdictional Hazard Mitigation Plan).
The California Geological Survey has published the locations of numerous faults which have been mapped in the Southern California region. Although the San Andreas fault is the most recognized and can produce 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 Figure 8-2 below. The faults that are in proximity to and could potentially cause significant shaking in the City’s water service area include the San Andreas fault, the Walnut Creek fault, the Whittier fault, the San Jose fault, the Red Hill fault, the Cucamonga fault, the Chino fault, and the Central Avenue fault.
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Figure 8-2- Location of Earthquake Faults (California Department of Conservation, 2025)
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Figure 8-3 provides the relative intensity of ground shaking in the vicinity of the City’s service area from anticipated future earthquakes. The locations of relatively long-period (1.0 second) earthquake shaking, including the City’s service area, are provided. Long-period shaking affects tall, relatively flexible buildings, but also correlates with earthquake damage. The shaking potential is calculated based on the level of ground motion that has a 2 percent chance of being exceeded in 50 years (or the level of ground-shaking with an approximate 2,500-year average repeat time). As discussed in Section 8.6.5, the City has prepared an ERP which provides the management, procedures, and designated actions the City and its employees will implement during emergency situations resulting from natural disasters, including during earthquakes, to ensure that customers receive a reliable and adequate supply of potable water. The City’s ERP is incorporated by reference.
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Figure 8-3- Earthquake Shaking Potential
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8.6.7 Shortage Response Action Effectiveness
The effectiveness of the shortage response actions for each of the standard water shortage levels identified in Section 8.5 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, to reduce any potential gaps between supply and demand, has been quantified in the expected demand reduction provided in Table 8-2.
Section 6 of the 2025 UWMP provides a tabulation of the City’s historical annual water demands for each water supply source. During the past 10 years, the City experienced a five-consecutive year drought within its service area from FY 2011-2012 to FY 2015-2016. Throughout this extended dry year period, the City’s annual water production ranged from 20,025 AF to 25,126 AF, with an average of approximately 23,394 AF. In addition, historical records indicate the City previously produced a maximum of up to 25,126 AF during FY 2012-2013. 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 FY 2020-2021 to FY 2024- 2025) averaged approximately 19,416 AFY. Due to conservation efforts and demand management measures (discussed in Chapter 9 of the 2025 UWMP), the City’s recent water demands have been significantly less than its historical water demands, including during long- term droughts. The City’s projected water demands (during a normal year, a single dry year, and a five consecutive year drought) are provided in Section 7 of the 2025 UWMP and are anticipated to incorporate similar reductions in water use rates as a result of the shortage response actions, ongoing conservation efforts, and demand management measures. Because the City’s projected water demands are similar to its historical water demands, it is anticipated the City will be able to continue providing sufficient water supplies to its customers to meet projected water demands, including during long-term droughts. In addition, based on historical and ongoing management practices, the City will be able to continue relying on its water supply source from the Chino Basin for adequate supply augmentation in response to each of the standard water shortage levels identified in Section 8.5.
Based on the City’s demonstrated ability to meet water demands during past water supply shortages, the adopted water shortage levels, the adjusted operating safe yields, and water supplies during long-term droughts, it is anticipated that the City will be able to provide sufficient water supplies to its customers during each of its standard water shortage levels. The City will enact varying levels of its WSCP to encourage retail customers to reduce water consumption.
Notwithstanding, the effectiveness of each of the City’s shortage response actions, in order to reduce any potential gaps between supply and demand, has been quantified in the expected demand reduction section provided in Table 8-2. The effectiveness of the City’s shortage City of Chino
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response actions is based on the City’s water demands prior to 2015 (unconstrained demands).
The City reduced its water demands in 2015 in response to the Governor’s April 1, 2015, Executive Order B-29-15 which mandated statewide reduction in water use of 25 percent. The City’s actual water demand reduction during this period was used to estimate the extent of water use reductions for the City’s Water Shortage Stages. The City’s Water Shortage Levels 1, 2, 3, 4, 5, and 6 are expected to reduce water demands by up to 10%, 20%, 30%, 40%, 50%, and greater than 50%, respectively.
8.7 Communication Protocols
Since July 1, 2022, the City is required to submit an Annual Assessment in accordance with DWR’s guidance and requirements. The Annual Assessment will include a review of the City’s unconstrained water demands (i.e., water demands prior to any projected response actions the City may trigger under this WSCP) for the current year and the upcoming (potential single dry) year. The City will also include information regarding anticipated shortages, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the City’s WSCP.
When any water shortage level is declared by resolution of the City Council, the specific level called for shall be made by public announcement and shall be published at least twice in a newspaper of general circulation and shall become effective immediately on the date specified in the newspaper publications. If the water shortage requires further intervention, the City will declare a water shortage emergency as specified in Water Code Chapter 3. When any other water shortage level is declared or the drought conditions no longer exist, then publication of the applicable portion of this WSCP, or a statement stating that the drought conditions no longer exist, shall be published an additional two times.
A review board is established to review hardship and special cases which cannot follow the letter of this WSCP. The review board shall consist of any two of the following or their respective designees: Director of Development Services, Director of Finance, or Director of Public Works.
Appeal of any board decision shall be made to the City Manager.
It is the purpose of the review board to review hardship or special cases and to determine whether or not said case warrants an exemption. The decision of the review board shall be prepared in writing, include terms and conditions, if any, set forth findings in support of the decision, and are promptly sent to the applicant. The board shall consider the facts of each case and decide whether to grant an exemption within five (5) working days of the receipt of a properly completed "Application for Exemption from Mandatory Water Restrictions" form. The application must include pertinent information and a written statement from the applicant. An exemption shall be granted for reasons of economic hardship which is defined as, but not limited to, a threat to an individual business's primary source of income (but under no circumstances shall inconvenience or the potential for damage of landscaping be considered an economic hardship which justifies an exemption.) An exemption may also be granted in instances where the water use restrictions cannot be met without threatening public health or safety, or there has been a significant change in the customer's circumstances. No exemption City of Chino
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will be granted to any customer for any reason in the absence of a demonstration that the customer has achieved the maximum practical reduction in water consumption. The board shall authorize only the implementation of equitable water use restrictions which further the purpose and intent of the emergency water conservation plan. The special water use restrictions authorized by the board in each special or hardship case shall be set forth on the face of the exemption.
An exemption to any element of this WSCP granted under any adequate water shortage level shall not be valid upon implementation of any more severe water shortage level of this WSCP.
An exemption expires under its own terms and conditions and/or when the next higher level of the water shortage takes effect. A separate application for exemption must be submitted at each higher water shortage level unless the exemption conditions specifically do not require such separate application.
Any person, corporation, or association who is granted an exemption and makes use of the water utility of the City pursuant to said exemption shall provide proof of said exemption upon demand by any peace officer or person authorized by the City to enforce this WSCP. Upon conviction of any person, corporation, or association for violating any provision of this part, the review board shall revoke any exemption previously granted. However, the board shall notify applicant of the proposed revocation in writing no less than five (5) working days before taking such action, and applicant shall be given the opportunity to be heard by the review board prior to it taking such action.
Persons wishing to appeal the decision of the board shall have the right to appeal to the City Manager. Appeal shall be made in writing within ten (10) working days of the board decision.
The decision of the City Manager shall be final.
8.8 Compliance and Enforcement
It is unlawful for any water customer to fail to comply with any of the provisions of this WSCP.
Notwithstanding any other provision of the City Code, the penalties set forth herein shall be exclusive and not cumulative with any other provisions of this code. Furthermore, any and all violations that occur on any one day shall be treated as one violation for the purposes of determining a penalty. The penalties for failure to comply with the provisions of this WSCP shall be as set out as follows:
1. For the first violation by any customer of any of the provisions of this WSCP, the City shall issue a written notice of the fact of such violation to the customer.
2. For a second violation by any customer of any of the provisions of this WSCP within the same twelve-month period beginning with the first violation, the City shall issue a final written notice of the fact of such violation to the customer.
3. For a third violation by any customer of any of the provisions of this WSCP within the same twelve-month period beginning with the first violation, a surcharge in the amount of fifty dollars shall be added to the customer's water bill.
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4. For a fourth violation by any customer of any of the provisions of this WSCP within the same twelve-month period beginning with the first violation, a surcharge in the amount of one hundred dollars shall be added to the customer's water bill that follows the customer's water bill containing the fifty-dollar surcharge for the third violation.
5. For a fifth and any subsequent violation by any customer of any of the provisions of this WSCP within the same twelve-month period beginning with the first violation, a surcharge in the amount of one hundred and fifty dollars shall be added to the customer's water bill that follows the customer's water bill containing the one hundred- dollar surcharge for the fourth violation.
6. After a fifth violation of this WSCP within the same twelve-month period beginning with the first violation, the City may install a flow restricting device of one (1) gallon per minute (GPM) capacity for services up to one and one-half inch size and comparatively sized restrictors for larger services. Such action shall be taken only after a hearing held by the review board where the customer has an opportunity to respond to the City's information or evidence that the customer has repeatedly violated this chapter's rules regarding the conservation of water and that such action is reasonably necessary to assure compliance with this WSCP regarding the conservation of water. Appeal of board decisions shall be made in writing to the City Manager within ten (10) working days of the board hearing. The decision of the City Manager shall be final. Any such restricted service may be restored upon application of the customer made not less than forty-eight (48) hours after the implementation of the action restricting service and only upon a showing by the customer that the customer is ready, willing, and able to comply with the provisions of this WSCP's rules regarding the conservation of water. Prior to any restoration of service, the customer shall pay all City charges for any restriction of service and its restoration as provided for in a separate ordinance.
8.9 Legal Authorities
The City Council shall authorize and direct implementation of the applicable provisions of this WSCP upon determination that such implementation is necessary to protect the public health, welfare, and safety, or when the demand for water consumption threatens to exceed the City's available supply of potable water to the customer.
When any water shortage level of this WSCP is declared by resolution of the City Council, the specific level called for shall be made by public announcement and shall be published at least twice in a newspaper of general circulation and shall become effective immediately on the date specified in the newspaper publications. When any other water shortage level is declared or the drought conditions no longer exist, then publication of the applicable portion of this WSCP, or a statement stating that the drought conditions no longer exist, shall be published an additional two times.
This WSCP shall authorize the City Manager to implement the provisions hereof by monitoring progress of the WSCP. Further, the City Manager may adopt any and all revisions that he City of Chino
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deems necessary to meet the intent of this WSCP. Thereafter, the City Manager may promulgate such revisions by signing and dating them.
The City shall coordinate with any city or county within which it provides water supply services for the possible proclamation of a local emergency. This includes the County of San Bernardino.
8.10 Financial Consequences of WSCP
A primary source of City revenue is user service charges, which consist of charges according to meter size and a volumetric charge per unit of water consumed. As of December 1, 2019, the City implemented water budget-based rates where each customer is given an individual budget based on their own water use. The City’s current water rate structure is tiered to promote water conservation by customers. The water rates have been developed to fund the cost of water and are related to the overall cost of water service. Residential, commercial, and landscape customers are billed on separate inclining block rate structures, with a fixed service charge based on meter size, to encourage water conservation and discourage waste. The rate structures include three tiers. The charges have historically accounted for a large portion of the City’s water sales revenue.
The City has historically maintained a financial reserve in its Water Fund. The City may use financial reserves for water system expenditures to make up for shortfalls in water revenue associated with reduced water sales.
8.11 Monitoring and Reporting
Chino regularly monitors water supply and consumption throughout the service area. During water supply shortages, City staff will monitor overall water consumption on a monthly basis based off the City’s metering and accounting system. Rates of consumption will be assessed in comparison with “normal” unrestricted water use rates based on historical consumption during non-shortage periods. In the event system-wide monitoring indicates water use reduction targets are not met, City staff may perform a more detailed review and comparison against normal water use rates for specific water use categories. Outcomes of the categorical review may include additional targeted outreach/communication to categories that have not achieved the appropriate reduction and/or identification of specific meters/users for additional records review.
Customer compliance with the provisions adopted by declaration of a WSCP are monitored and reported through water loss audits performed by the City. Staff prepare annual Distribution System Water Audits to monitor water losses. Staff review the audits to track real and apparent losses. Losses are monitored by comparing water production to sales. The City regularly monitors its system and repairs leaks in a timely manner. To help in its effort to reduce and eliminate losses, The City has implemented a Meter Replacement and Retrofit Program to install meters with advanced metering infrastructure.
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8.12 WSCP Refinement Procedures
The City’s WSCP has been prepared as an adaptive management plan. As discussed in Section 8.9, the City will monitor and report on the implementation of the WSCP. The City will review the implementation results for any current or potential shortage gaps between water supplies and demands. The City will evaluate the need for revising the WSCP to resolve any shortage gaps, as necessary. The City will consider the following potential revisions in the event of a potential shortage gap:
• Implementation of additional public outreach, education, and communication programs (in addition to the programs discussed in Section 9 of the City’s 2025 UWMP). • Implementation of more stringent water use restrictions under the standard water shortage levels (discussed in Section 8.5).
• Implementation of stricter enforcement actions and penalties (discussed in Section 8.6). • Improvements to the water supply augmentation responses (discussed in Section 8.6.2), as well as any associated operational changes (discussed in Section 8.6.3) which may be required.
• Incorporation of additional actions recommended by City staff or other interested parties.
The City will use the monitoring and reporting data to evaluate the ability for these potential revisions to resolve any shortage gaps which may occur within the standard water shortage levels.
This WSCP is adopted as part of the City’s 2025 UWMP adoption process discussed in Section 10 of the City’s 2025 UWMP. It is anticipated the City will review, revise, and adopt an updated WSCP as part of preparing its 2025 UWMP, as necessary. However, the City will continue to review the monitoring and reporting data, and if needed, update the WSCP more frequently.
Any updates to the City’s WSCP will include a public hearing and adoption process by City Council (see Section 8.14).
8.13 Special Water Feature Distinction
The City’s WSCP defines “decorative water features” as water features which are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, but excluding pools and spas. In general, there are additional health and safety considerations in the water supplied to pools and spas compared to decorative water features. As a result, the City’s WSCP has reviewed the response actions, enforcement actions, and monitoring and reporting programs separately for decorative water features and for pools and spas, as applicable.
8.14 UWMP Adoption, Submittal, and Availability
The City’s WSCP is adopted as part of the City’s 2025 UWMP adoption process discussed in Section 10 of the City’s 2025 UWMP. The process for adopting the City’s WSCP includes the following:
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• The City will conduct a public hearing and make the WSCP available for public inspection.
• The City will provide notification of the time and place of the public hearing to any city or county in which water is provided.
• The City will publish notice of public hearing in a newspaper once a week, for two successive weeks (with at least five days between publication dates). • The City Council will adopt the 2025 UWMP and the WSCP. • As part of submitting the 2025 UWMP to DWR, the City will also submit the WSCP (electronically through DWR’s online submittal tool) within 30 days of adoption and by July 1, 2026.
• The City will submit a copy of the WSCP to the California State Library and to any city or county in which water is provided within 30 days of adoption. • In addition, the City will make the WSCP available for public review within 30 days of adoption.
If there are any subsequent amendments required, the process for adopting an amended WSCP includes the following:
• The City will conduct a public hearing and make the amended WSCP available for public inspection.
• The City Council will adopt the amended WSCP.
• The City will submit the amended WSCP to DWR (electronically through DWR’s online submittal tool) within 30 days of adoption.
Additional information regarding the adoption, submittal, and availability of the City’s WSCP (and 2025 UWMP) is provided in Section 10 of the City’s 2025 UWMP.
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9 Demand Management Measures
This section describes Chino ’s Demand Management Measures (DMMs) efforts to promote water use efficiency, reduce demand on the water supply, and prepare for future requirements.
IN THIS S ECTIO N
• Existing Demand Management
• Reporting Implementation
• Water Use Objectives
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9.1 Introduction
This section outlines Chino’s water conservation efforts over the past five years, current initiatives, and future plans to meet State efficiency standards from DWR. Key takeaways from each section are as follows:
• The City has implemented “DMMs” to reduce its water demands and achieve its water use targets.
• The City’s DMMs include public education and outreach programs regarding water conservation.
• The City’s DMMs include staffing of its water conservation program. • Additional DMMs including rebate, conservation, asset management, and wholesale supplier assistance programs are discussed.
• The City’s DMMs include adoption of ordinances to prevent water waste. • The City’s DMMs include metering of all customer connections, including separate metering for single-family residential, commercial, industrial, large landscape and institutional/governmental facilities.
• The City’s DMMs include conservation pricing. The City’s current water rate structure is tiered to promote water conservation by customers.
• The City’s DMMs include various actions to assess and manage water distribution system losses.
A summary of the DMMs the City has implemented over the past five (5) years is provided. The City met the 2020 Water Use Target (discussed in Section 5) through the implementation of these DMMs.
9.2 Existing Demand Management Measures
The City is committed to implementing water conservation programs. The City also works collaboratively with IEUA to provide water conservation programs for the City’s residents. As a customer agency of IEUA, the City’s residents have the benefit of participating in IEUA’s conservation efforts. The City works closely with IEUA to facilitate the installation of water saving technology and devices and implementation of public outreach and education programs.
Water use efficiency programs are a significant part of IEUA’s Water Resources Program. The following sections describe the City’s implementation of the DMMs required in the UWMP Act.
9.2.1 Water Waste Prevention Ordinances
The City has adopted ordinances in support of water conservation efforts to prevent water waste. Copies of these ordinances are provided in Appendix H.
The City adopted Ordinance No 2009-04 (“Water Conservation Program”) in May 2009, which established regulations to prevent water waste. Ordinance No 2009-04 includes the following restrictions (Municipal Code § Title 13 - WATER, SEWERS AND UTILITIES Chapter 13.04 - WATER, 2025):
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• Allowing irrigation water to run off into a gutter, ditch, drain, driveway, sidewalk, street, or onto pavement or other hard surface.
• Outdoor irrigation of landscape for more than fifteen minutes of watering per day per station. This restriction does not apply to landscapes that utilize drip irrigation systems. • Automated irrigation of landscape during the hours of 6:00 a.m. to 8:00 p.m. Customers are encouraged to avoid the use of sprinklers on windy days. Irrigation by handheld hoses with automatic shutoff nozzles, drip irrigation, or handheld buckets is permitted anytime.
• Outdoor irrigation of landscape on rainy days.
• Washing down hard or paved surfaces, including but not limited to sidewalks, walkways, driveways, parking areas, patios, and alleys, except when necessary to alleviate safety or sanitary hazards.
• Excess use, loss or escape of water through breaks, leaks, or other malfunctions in the plumbing system or distribution system for any period of time after such escape of water should have reasonably been discovered and corrected.
• Washing of automobiles, trucks, trailers, boats, airplanes, and other types of mobile equipment, unless done with a handheld bucket or handheld hose equipped with a positive shutoff nozzle for quick rinses.
• Restaurants serving water to their customers, except when specifically requested by their customers.
• Operating a decorative water fountain or feature, built or installed after the adoption of this ordinance, that does not include re-circulated water. • Operating a commercial car wash or laundry, built or installed after the adoption of this ordinance, that does not use re-circulated water.
• Operating a single-pass cooling system built or installed after the adoption of this ordinance.
Since then, the City adopted Urgency Ordinance No. 2015-004 in June 2015, which established additional regulations and penalties to the Water Conservation Program. Ordinance No 2015- 004 includes the following restrictions:
• Prohibitions on serving drinking water at eating or drinking establishments (unless requested).
• Commercial lodging establishments must provide the option to not launder daily. • Irrigation only on Monday, Wednesday, Friday, and Saturday between the hours of 8 p.m. and 6 a.m.
The City also adopted Ordinance No. 2015-008 in October 2015, pertaining to water efficient landscapes to reduce or eliminate water waste. This ordinance implements DWR’s Model Water Efficient Landscape Ordinance as adopted by the California Water Commission.
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9.2.2 Metering
The City meters all customer connections, including separate metering for single-family residential, commercial, industrial, and landscape customers. The City has implemented a Meter Replacement and Retrofit Program to install meters with Advanced Metering Infrastructure (AMI). Furthermore, if there is new development within the City, each facility is individually metered. Service charges for the City are based on the customers’ connection size.
Further information regarding the City’s service fees and conservation pricing is provided in Section 9.2.3.
9.2.3 Conservation Pricing
As of December 1, 2019, the City implemented water budget-based rates where each customer is given an individual budget based on their own water use. The City’s current water rate structure is tiered to promote water conservation by customers. The water rates have been developed to fund the cost of water and are related to the overall cost of water service.
Residential, commercial, and landscape customers are billed on separate inclining block rate structures, with a fixed service charge based on meter size, to encourage water conservation and discourage waste. The rate structures include three tiers.
9.2.4 Public Education and Outreach
The City offers public information programs for its customers to promote water conservation.
The City provides marketing and outreach materials to its customers using social media platforms, the City’s website, community outreach events, school education programs, and direct communication to customers regarding their water use. Customers can learn about rebates and additional programs through the City’s website.
The City conducts water conservation school education programs to Chino elementary schools.
Programs include school assemblies, water efficient gardens, and other lesson materials to educate students on the topics of water conservation. The City is also a member of the Water Education Water Awareness Committee (WEWAC) that promotes the education of water issues to local schools. WEWAC hosts digital media and essay contests and provides financial support for lesson plan materials about water issues. The City will continue the school education programs to promote water conservation.
The City provides public information programs to promote and educate customers on water conservation by hosting and participating in City and regional community events, providing bill inserts, and attending community meetings. Events include the Chino Youth Museum Water Exhibit, Earth Day, the City Business Fair, and the Compost and Mulch Giveaway events, Gardening and Landscape training workshops, and the Water Conservation Festival in partnership with CBWCD. All outreach event flyers, rebate information, and general conservation program information are provided at City Hall or on the City’s website. The City will continue these programs to promote water conservation.
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9.2.5 Programs to Assess and Manage Distribution System Real Losses The City has water conservation literature that alerts customers to be on the lookout for water system leaks and to correct them promptly. Customers are encouraged to regularly check their usage on the City’s website. The City is available to assist customers in answering questions regarding system leaks or higher than expected water usage.
The City prepares annual Distribution System Water Audits (discussed in Section 4.2.3) to monitor water losses. City staff review the audits to track real and apparent losses. Losses are monitored by comparing water production to sales. The City regularly monitors its system and repairs leaks in a timely manner. To help in its effort to reduce and eliminate losses, the City uses AMI for accurate consumption data. In areas where a leak is visible, staff are dispatched to a site to pinpoint the leak to minimize the excavation area and save resources.
9.2.6 Water Conservation Program Coordination and Staffing Support
Staff from multiple City departments (Public Works, Finance, Development Services) are involved in the implementation of the water conservation program. These include water utility maintenance and operations personnel and administrative staff who coordinate activities, answer billing and usage questions, and respond to public inquiries.
9.2.7 Other Demand Management Measures
In addition to the above DMMs, the City implements programs in collaboration with regional partners.
Through IEUA’s Regional Water Use Efficiency Program, member agencies, including the City, are encouraged to adopt approaches and technologies to encourage customers to increase water efficiency. Approaches include the implementation of advanced monitoring infrastructure to increase customer engagement on their individual water usage. Locally implemented water conservation programs include: the Residential Landscape Tune Up Program; the Residential Landscape Retrofit Program; the Weather-Based Irrigation Control Update Program; and the Pressure Regulation Program. IEUA maintains staff for program coordination and annual reporting of the effectiveness of implemented programs.
The City participates in MWD’s Landscape Design Assistance Program through IEUA where customers are provided landscape design services for free. Additionally, the City participates in MWD’s Residential Landscape Transformation Program to reward customers whose landscape designs utilize water-saving plants, technology, irrigation systems, and hardware.
The City also participates in MWD’s regional rebate program, the SoCal Water$mart Program which is available to the City’s residential and commercial customers. There are rebates available for the purchase of high-efficiency clothes washers (HECW), premium high-efficiency toilets (PHET), weather-based irrigation controllers (Smart Controllers), rain barrels, rain cisterns, and turf removal to both residential and commercial customers to promote water City of Chino
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conservation. The City’s commercial customers are offered plumbing, landscaping, Heating, Ventilation, and Air Conditioning (HVAC), and medical and dental equipment rebates. The City provides information about these programs to customers on its website.
The City plans to continue implementation of these programs to promote water conservation.
9.3 Reporting Implementation
9.3.1 Implementation over the Past Five Years
The highlights of DMM implementation over the past five years are described in previous sections. Additionally, the City is committed to implementing water conservation programs and works collaboratively with IEUA to provide water conservation programs for its residents. As a customer agency of IEUA, the City’s residents have the benefit of participating in IEUA’s conservation efforts as well as those provided through MWD’s SoCal Water$mart and CBWCD programs. A summary of Chino’s program participation over the last five years is provided in Table 9-1.
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Table 9-1- Rebate Program Participation FY 2021 through FY 2025 SoCal Water$mart Residential Rebates FY 21 FY 22 FY 23 FY 24 FY 25 Total High-Efficiency Toilets (HET) 5 38 80 19 142
High-Efficiency Clothes Washers
(HECW) 72 74 56 122 34 358
Rotating Nozzles for Pop-up Spray
Heads (Nozzles) 75 75 150
Weather-based Irrigation Controllers
(WBIC) 45 42 25 28 19 159
Hose Bib Controller 1 4 2 7
Turf Replacement (sq. ft.) 8522 5300 19752 17,258 50832 Rain Barrels 1 2 6 9
Low-flow Showerheads 26 232 133 391
Faucet Aerators 24 76 88 188
IEUA Locally Implemented
Residential Programs FY 21 FY 22 FY 23 FY 24 FY 25 Total Landscape Tune-Up Program 189 101 377 291 124 1082
Nozzles 2540 1872 876 5288
Residential Landscape Retrofit Program 33 15 48
WBIC 44 23 67
Nozzles 114 6 120
Large Landscape Retrofit Program 23 22 2 47
WBIC 33 29 3 65
Nozzles 2 64 66
Small Site Controller Upgrade Program 224 90 95 409 WBIC 256 100 111 467
Res. Education, Survey, and Controller
Upgrade Program 133 113 246
WBIC 150 127 277
Residential Pressure Regulation Program 2 76 78
SoCal Water$mart
Commercial Rebates FY 21 FY 22 FY 23 FY 24 FY 25 Total
High-Efficiency Toilets (HET) 96 96
Irrigation Controller + Add on 1 1
Controllers 3 3
Stations 20 20
Laminar Flow Restrictor 194 194
Turf Replacement 33829 34717 68546
Plumbing Flow Control 58 58
Additional Water Use Efficiency
Programming FY 21 FY 22 FY 23 FY 24 FY 25 Total
CBWCD Landscape Evaluation Audit
Program 6 6 3 15
Source: (Inland Empire Utilities Agency, 2025)
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2025 Urban Water Management Plan | 9-8
Table 9-2- IEUA DMM Education and Outreach Program
Program FY 21 FY 22 FY 23 FY 24 FY 25
Water-saving technologies/
services
Owlie's Virtual
Adventures
4,595 11,221 19,360 15,250
Discover the Environment and
Water (DEW) Field Trip
Owlie's Virtual
Adventures
Owlie's Virtual
Adventures
1,946 2,350 2,086
Water Scout Badge Program 51 60
Annual Earth Day – Student Day
(includes K-5 students,
chaperones, and educators)
Virtual due to
COVID-19
Virtual due to
COVID-19
700 1,107 1100
Annual Earth Day (includes
community members, scout troops,
and after-school program
participants)
Virtual due to
COVID-19
Virtual due to
COVID-19
1000 964 860
Virtual Earth Week 5,000 page
views / 500
students
8,100 page
views / 450
students
Owlie’s Virtual Adventures 1,000 students 1,500 students Water is Life Annual Poster
Contest entries
800 522
Water Engineering 4 Good
(WE4G) (previously Solar Cup)
participants
Chino Hills High
School
Chino Hills,
Colony High
School, Upland
High School
Chino Hills
High School,
Upland High
School
Vina Danks
Middle
School
National Theatre for Children (NTC)
School assembly performances 16 virtual 14 live stream performances
69 71 59
Schools 38 52 37 37 36
Students 18,051 20,527 14,893 14,373 10,690
Teachers 823 567 577 542
Note: IEUA Programs are not limited to the City of Chino. The data reported here are inclusive of all IEUA programs for this period.
Source: (Inland Empire Utilities Agency, 2025)
9.4 Implementation to Achieve Water-Use Targets
As discussed in Section 5, the City met its SBX7-7 target in 2020 and has continued to do so in large part due to DMMs implementation. Water use efficiency standards from the CWOL Regulation supersede SBX7-7 standards. Water agencies, including the City, are required to begin reporting compliance consisting of indoor residential water use, outdoor residential water use, commercial, industrial, and institutional, irrigation with dedicated meters, water loss, and other unique local uses. Continued implementation of these DMMs will assist the City in meeting future water use targets and objectives, as discussed in Section 4.2.5.
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10 Plan Adoption, Submittal, and
Implementation
This section describes the steps taken to make the UWMP publicly available as well as adopt and submit the UWMP in accordance with the CWC.
IN THIS S ECTIO N
• Completed Steps for UWMP and
WSCP
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2025 Urban Water Management Plan | 10 -2 1
0.1 Completed Steps for UWMP and WSCP
As discussed in Section 2.3, Chino coordinated the preparation of the 2025 UWMP with multiple agencies. Chino notified these agencies, as well as the cities and county within which Chino provides water supplies, at least sixty (60) days prior to the public hearing of the preparation of the 2025 UWMP and WSCP and invited them to participate in the development of the UWMP and WSCP. A copy of the notification letters sent to these agencies is provided in Appendix B.
The UWMP and WSCP were made available for public review in May 2026, and a public hearing was held on June 2, 2026, to receive public input on the draft documents.
Chino City Council adopted the 2025 UWMP and the WSCP at a public meeting on June 2, 2026. The resolution of adoption is included as Appendix D.
This UWMP and WSCP were submitted to DWR through the WUEdata portal before the deadline of July 1, 2026. This UWMP and WSCP will be available to the public on the Chino website.
If Chino identifies the need to amend this UWMP or WSCP, it will follow the same procedures used previously for notification to cities, counties, and the public and for initial adoption.
10.2 Plan Submittal
Chino’s City Council adopted the 2025 UWMP on J une 2, 2026, and within 30 days, Chino sub- mitted the adopted 2025 UWMP (including the WSCP) to DWR. The 2025 UWMP and WSCP were submitted through DWR’s “Water Use Efficiency (WUE) Data Portal” website.
DWR developed a checklist which was used by Chino to assist DWR with its determination that Chino’s 2025 UWMP has addressed the requirements of the CWC. Chino has completed the DWR checklist by indicating where the required CWC elements can be found within Chino’s 2025 UWMP (See Appendix E).
Within 30 days of adoption of the 2025 UWMP, including the WSCP, Chino submitted copies of the adopted UWMP to the San Bernardino County Assessor‐Recorder/Clerk’s Office and California State Library in accordance with CWC requirements.
10.3 Public Availability
Within 30 days after submittal of the 2025 UWMP to DWR, Chino made the 2025 UWMP (including the WSCP) available at Chino’s main office during normal business hours and on Chino’s website.
10.4 Amending an Adopted UWMP or WSCP
If Chino amends the adopted 2025 UWMP (and/or the WSCP), the amended UWMP or WSCP will undergo adoption by Chino’s governing board. Within 30 days of adoption, the amended City of Chino
2025 Urban Water Management Plan | 10 -3
UWMP will then be submitted to DWR, the State of California Library, and the County of San Bernardino’s Assessor- Recorder/Clerk’s office.
City of Chino References
2025 Urban Water Management Plan | REF -1
References
AB1668. (2018). Assembly Bill 1668. California.
California Department of Conservation. (2025, July 23). Fault Activity Map of California.
Retrieved from DOC Maps: Geologic Hazards:
https://www.conservation.ca.gov/cgs/publications/ms48
Chino Basin Optimum Management Program. (2018). State of the Basin Report.
Department of Water Resources. (2025). Urban Water Management Plan Guidebook .
Inland Empire Utilities Agency. (2025). Annual Reports. Chino: Inland Empire Utilities Agency.
Retrieved from https://www.ieua.org/read-our-reports/annual-reports/ Inland Empire Utilities Agency. (2025). Regional Water Use Efficiency Programs Report. Chino:
Inland Empire Utilities Agency. Retrieved from https://www.ieua.org/read-our- reports/water-use-efficiency-reports/
Municipal Code § Title 13 - WATER, SEWERS AND UTILITIES Chapter 13.04 - WATER. (2025, August 19). Chino, California, United States of America. Retrieved from https://library.municode.com/ca/chino/codes/code_of_ordinances?nodeId=TIT13WASEU T_CH13.05WACO
SB606. (2018). Senate Bill 606, Functional Zero Act. California.
Southern California Association of Governments. (2021). RHNA 6th Cycle Allocation Plan.
Southern California Association of Governments. (2024). Connect SoCal Regional Transportation Plan (RTP).
State of California Department of Water Resources. (2021).
Watermaster, C. B. (November 21, 2024). 2024/25 Assessment Package.
City of Chino DWR Tables
2025 Urban Water Management Plan | A
Appendix A DWR Tables
A
CA3610012 City of Chino 23,420 15,324
23,420 15,324
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
Select One Name of Regional Alliance or
RUWMP (Drop Down List)
NOTES:
Submittal Table 2-2: Plan Identification
Type of Plan
Individual UWMP
If Water Supplier is also a member of a SB X7-7
Regional Alliance, select name from the drop-down.
Regional Urban Water Management Plan (RUWMP)
If Supplier selected RUWMP, select name from the
drop-down.
Supplier is a wholesale supplier
Supplier is a retail supplier
UWMP Tables are in calendar years
UWMP Tables are in fiscal years
Unit AF
Submittal Table 2-3: Supplier Identification
Type of Supplier (select one or both)
Fiscal or Calendar Year (select one)
If using fiscal years provide month and date that the fiscal year begins (mm/dd)
Units of measure used in UWMP
(Select from the drop down list).
7/1
DWR NOTES:
Units of measure (AF, CCF, MG) must remain consistent
throughout the UWMP as reported in Submittal Table 2-3.
NOTES:
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
Inland Empire Utilites Agency
Water Facilities Authority
Chino Basin Desalter Authority
NOTES:
2025 2030 2035 2040 2045 2050(opt)
95,744 98,820 101,897 106,040 110,183 114,327
Submittal Table 3-1 Retail: Population - Current and Projected Water Code Section 10631(a)
Population
Served
NOTES:
Use Type
Drop down list
May select each use multiple times
These are the only use types that will be
recognized by the WUEdata online submittal tool
Potable or Non-
Potable
(OPTIONAL)
Drop down list
Volume (AF)
Single Family Potable 7,230
Multi-Family Potable 1,383
Commercial Potable 2,188
Industrial Potable 470
Landscape Potable 2,584
Agricultural Potable 24
Other (optional) Potable 44
Distribution System Water Loss Potable 1,400
15,323
0 15,323Total
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)
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 8,070 8,009 8,070 8,230 8,472
Multi-Family Potable 1,437 1,371 1,327 1,302 1,292
Commercial Potable 2,395 2,599 2,803 3,007 3,211
Industrial Potable 524 554 584 615 645
Landscape Potable 2,513 2,197 1,966 1,804 1,699
Agricultural Potable 38 51 64 77 90
Other (optional) Potable 26 8 -10 -29 -46
Distribution System Water Loss Potable 1,538 1,705 1,873 2,041 2,208 16,541 16,494 16,677 17,047 17,571
0 0 0 0 0
16,541 16,494 16,677 17,047 17,571
Submittal Table 4-2 Retail: Total Uses for Potable, and Non-Potable Water — 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
Add additional rows as needed.
Are Future Water Savings Included in Projections?
Drop down list (y/n) Yes
If "Yes" to above, state the section or page number, in the cell to the right, where citations of the codes, ordinances, or otherwise are utilized in demand projections are found.
Optional Suppliers may complete Optional Submittal Table 4-4 R to quantify the expected savings.
Section 4.3/
4.2.5 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.
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)
CA3610012
DWR NOTES: Suppliers will provide a link to the WUEdata submittals of their Water Loss Audit Reports.
NOTES: See Section 4.2.3 for direct links to AWWA Water Audits.
Report submittal status for all five years for each Public Water System as available.
Add rows as needed
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)
CA3610012 Yes 19
Gallons per
Service
Connection per
Day (GPSCD)
23,052 1038 40.2 8.5
Gallons per
Service
Connection per
Day (GPSCD)
23,052 201 7.8
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
Actual 2025
GPCD
(From SB X7-7
Compliance Form)
Did Supplier
meet the 2020
Target in
2025?
No Individual
Target 189 169 Yes NA
Submittal Table 5-1 Retail: SB X7-7 2020 Target Progress Water Code Section 10608.40
NOTES:
Did Supplier
Achieve
Targeted
Reduction for
2020?
Actual 2020
GPCD 2020 Target
Regional
Alliance Target
or Individual
Target?
Drop down list
DWR NOTES:
Suppliers calculating a 2025 GPCD will need to complete and submit SB X 7-7 Compliance Tables to verify the use of SB X7-7 Methodologies.
Suppliers that were part of a merger or consolidation since 2020 see Chapter 5 and Appendix P for guidance.
NA=Not Applicable
Check the box if the Supplier was not an Urban Water Supplier during or before the 2020 UWMP reporting cycle. Proceed to the next table.
Only for suppliers that did not
meet the Target in 2020
See DWR NOTES below.
Was Supplier
part of a merger
or consolidation
since 2020?
Groundwater Type
Drop Down List
May use each category
multiple times
Potable or
Non-Potable
(OPTIONAL)
Drop down list
Location or Basin Name 2021 (AF) 2022 (AF) 2023 (AF) 2024 (AF) 2025 (AF) Alluvial Basin Potable Chino Basin 6,133 6,193 5,569 5,87 2 6,186 6,133 6,193 5,569 5,872 0
Add additional rows as needed
Submittal Table 6-1 Retail: Groundwater Volume Pumped
Water Code Section 10631(4) and 10631(4)(c)
DWR NOTES:
Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.
NOTES
Total
Check the box if the Supplier does not pump groundwater.
Proceed to the next table.
Check the box if all or part of the groundwater described below is desalinated. (OPTIONAL) Name of Wastewater
Collection Agency
Wastewater
Volume Metered
or Estimated?
OPTIONAL
Drop Down List
Volume of
Wastewater Collected
from UWMP Service
Area 2025 (AF)
Name of Wastewater
Treatment Plant
(WWTP) and Place ID
Number
Drop down list
Is WWTP Located
Within UWMP
Area?
Drop Down List
IEUA Estimated 3,453
IEUA Carbon Canyon
WWRF, Place ID
259184
Yes
IEUA Estimated 0 IEUA Carbon Canyon
WWRF, Place ID Yes
IEUA Estimated 3,187
IEUA Carbon Canyon
WWRF, Place ID
259186
Yes
6,640
Check the box if there is no wastewater collection system.
Proceed to the next table.
NOTES: Row 2 and 3 of table describe facility RP-2 and RP-5 respectively.
Submittal Table 6-2 Retail: Wastewater Collected W ithin Service Area Water Code Section 10633(a)
Percentage of 2025 service area population served by wastewater collection system (OPTIONAL)
Percentage of 2025 service area served by wastewater collection system (OPTIONAL)
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.
Additional Guidance : See Appendix M, Section M.21 for detailed guidance on this table.
Wastewater Collection Recipient of Collected Wastewa ter Total Wastewater Received from UWMP
Service Area in 2025:
Add additional rows as needed
Treatment Level
Drop down list
Volume
(AF)
Treatment Level
Drop down list
Volume
(AF)
Treatment Level
Drop down list
Volume
(AF)
Treatment Level
Drop down list
Volume
(AF)
Treatment Level
Drop down list
Volume
(AF)
Name of other
entity
IEUA Carbon Canyon
WWRF, Place ID 259184 Yes 3,453 3,453 1,806 480 1,168 IEUA Carbon Canyon
WWRF, Place ID 259185 Yes 0 - - - 0 IEUA Carbon Canyon
WWRF, Place ID 259186 Yes 3,187 3,187 1,702 439 1,047 6,640 6,640 3,508 919 2,215 0 0
Submittal Table 6-3 Retail: Wastewater Treatment and Outcomes Within UWMP Service Area Water Code Section 10633(b)
DWR NOTES:
Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.
IPR: Indirect Potable Reuse would have the treatment level of its end use requirement in the Level of Treatment drop-down.
Additional Guidance: See Appendix M, Section M.21 for detailed guidance on this table.
Water Recycled Outside of
UWMP Service Area
(enter data as applicable)
Effluent Discharge that is
not a Permitted Recycled
Water Use
(enter data as applicable)
Required Discharge for
Instream Flow
(enter data as applicable)
Delivered to Another Entity for Additional
Treatment
(enter data as applicable)
Add additional rows as needed
2025 Outcomes of Treated Wastewater
Check the box if no wastewater is treated or disposed of within the UWMP service area.
Proceed to the next table.
Does This Plant
Treat
Wastewater
Generated
Outside the
UWMP Service
Area?
(OPTIONAL)
Drop down list
Wastewater Treatment
Plant Name and Place ID
Number
Drop down list
Total 2025
Volume of
Water
Treated (AF)
NOTES :Row 2 and 3 of table describe facility RP-2 and RP-5 respectively.
Total
2025 Volume of
Wastewater
Received from
UWMP Service
Area
(As Reported in
Submittal Table
6-2 R) (AF)
Water Recycled Within
UWMP Service Area
(enter data as applicable)
Volume Narrative page number
(OPTIONAL)
Agricultural irrigation Non-Potable 1,223 1, 450 1,300 1,100 900 700 Landscape irrigation (exc golf
courses) Non-Potable 2,166 2,369 2,615 2,887 3,188 3,520 Industrial use Non-Potable 19 21 23 26 28 31 Groundwater recharge (IPR) 2,151 2,375 2,622 2,895 3,196 3,529 Other (Description Required) Non-Potable Hydrant mete r 96 100 105 110 115 120 - - - - - - - 3,504 3,940 4,043 4,123 4,231 4,371 - 5,655 6,315 6,665 7,018 7,427 7,900 - 0Total Use Type
Drop down list
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop down list
Additional Information
(as needed)
Add additional rows as needed
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.
Additional Guidance: See Appendix M, Section M.21 for detailed guidance on this table.
Potential recycled water use: a description of the feasibility of these uses must be included in the narrative.
Multiple Producers: If you have multiple recycled water producers, submit a separate table for each.
NOTES:
2050 (AF) 2025 (AF) 2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) Subtotal Potable
Subtotal Non-Potable
Check box if recycled water is not used and is not planned for use within the service area of the supplier. The supplier will only complete the column on "Potential Recycled Water Use" and submit an accompanying narrative on the feasibility of that potential recycled water use.
Submittal Table 6-4 Retail: Recycled Water Direct Beneficial Uses Within Service Area Water Code Section 10633 (c),(d),(e)
Potential Recycled Water Use
Name(s) of Facility/ies Producing (Treating) the Recycled Water (OPTIONAL) : IEUA Name of Supplier Operating the Recycled Water Distribution System (OPTIONAL) : City of Chino Hills Volume of Supplemental Water Added in 2025 (OPTIONAL) :
Source of 2025 Supplemental Water (OPTIONAL) :
2020 Projection
for 2025 (AF)
2025 Actual
Use (AF)
2,197 1,223
Landscape irrigation (exc golf courses) 2,302 2,166
Golf course irrigation 19
Groundwater recharge (IPR) 2,151
Other (Description Required) 96
4,500 5,655
Submittal Table 6-5 Retail: 2020 UWMP Recycled Water Use Projection Compared to 2025 Actual
Water Code Section 10633(e)
Check the box if recycled water was not used in 2025 nor previously projected for use in 2020.
Proceed to the next table.
Add additional rows as needed
Agricultural irrigation
NOTES:
Total
DWR NOTES:
Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure reported in Submittal Table 2-3 Additional Guidance: See Appendix M, Section M.21 for detailed guidance on this table.
Use Type
Drop Down list
Name of Action Description Expected Increase in Recycled Water Use (AF)
Retrofits Retrofit landscape irrigation systems 0
Recycled Water Distribution
System Expansion
Expand existing recycled water distribution
system 0
0 0
Total (AF)
DWR NOTES:
Units of measure (AF, CCF, MG) MUST remain consistent with units reported in Submittal Table 2-3. This table identifies the unit of measure selected in Submittal Table 2-3.
The unit conversion to Acre Feet addresses the Water Code's requirement that this value be provided in acre-feet.
NOTES:
Submittal Table 6-6 Retail: Methods to Encourage Future Recycled Water Use Water Code Section 10633(f)
Check the box if the Supplier does not plan to expand recycled water use in the future. Supplier will not complete the table below but will provide narrative explanation.
Provide page location of narrative in the UWMP
Add additional rows as needed
Unit Conversion to AF
Planned Implementation
Year
Ongoing
Ongoing
Drop Down
List
(yes/no)
If Yes, Supplier Name
State Street Water Treatment
Plant No Potable 2026 6,452
Wel 17 No Potable 2026 1,774
Well 16 No Potable 2026 1,452
Well 11 No Potable 2026 2,742
Planned for Use in
Year Type
Drop Down List
NOTES:
Submittal Table 6-7 Retail: Expected Future Water S upply Projects or Programs Water Code Section 10631(f)
DWR NOTES:
Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3. This table identifies the unit of measure reported in Submittal Table 2-3.
Check the box if some or all of the supplier's future water supply projects or programs are not compatible with this table and are described in a narrative format.
Check the box if there are no expected future water supply projects or programs that provide a quantifiable increase to the agency's water supply.
Proceed to the next table.
Planned
Implementation
Year
Add additional rows as needed
Joint Project with other suppliers? Expected
Increase in
Water Supply
to Supplier
(This may be a
range) (AF)
Provide page location of narrative in the UWMP
Name of Future Projects or
Programs
Additional Description
(as needed)
Potable or Non-Potable
(after treatment if treated)
(OPTIONAL)
Drop Down list
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) Chino Basin Potable 6,186 Purchased or Imported Water Chino Basin Desalter
Authority Potable 5,086
Purchased or Imported Water Water Facilities Authority Potable 4,052 Recycled Water Inland Empire Utilities
Agency Non-Potable 3,508
15,324
3,508
18,832
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)
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) Chino Basin Potable 7,669 7,790 8,102 8,573 9,171 Purchased or Imported Water
Chino Basin
Desalter
Authority
Potable 5,000 5,000 5,000 5,000 5,000
Purchased or Imported Water
Water
Facilities
Authority
Potable 3,902 3,902 3,902 3,902 3,902
Recycled Water
Inland
Empire
Utilities
Agency
Non-Potable 6,314 6,665 7,018 7,427 7,900
16,571 0 16,692 0 17,004 0 17,475 0 18,073 0
6,314 0 6,665 0 7,018 0 7,427 0 7,900 0
22,885 0 23,357 0 24,022 0 24,902 0 25,973 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
supply categories that will be
recognized by the WUEdata online
submittal 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.
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 7/1/2024
End Date of Reporting Period 6/30/2025
Is upstream embedded energy in the values
reported?
Units of Measure for Water AF Total Utility
See DWR NOTES Hydropower Net Utility
15,324 15,324
5,335,320 5,335,320
1,068 - 1,068
Quantity of Self-Generated Renewable Energy
0 kWh
Data Quality (Estimate, Metered Data, Combination of Estimates and Metered Data) Data Quality Narrative:
Narrative:
Volume of Water Entering Process
Energy Consumed (kWh)
Energy Intensity (kWh/vol. converted to MG)
Optional Submittal Table O-1B: Recommended Energy Reporting - SINGLE DELIVERY
PRODUCT - TOTAL UTILITY APPROACH
Only for Water Delivery Products Under the
Urban Water Supplier's Operational Control
Sum of All Water
Management
Processes
Non-Consequential
Hydropower
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:
% of Average Supply
Average Year 2012-2025 100%
Single-Dry Year 2018 97%
Consecutive Dry Years 1st Year 2012 105%
Consecutive Dry Years 2nd Year 2013 108%
Consecutive Dry Years 3rd Year 2014 110%
Consecutive Dry Years 4th Year 2015 99%
Consecutive Dry Years 5th Year 2016 87%
14,728
14,377
Year Type
Base Year
If not using a calendar
year, type in the last
year of the fiscal,
water year, or range
of years, for example,
water year 2024-2025,
use 2025
Optional Submittal Table 7-1 Retail: Basis of Water Year Data (Reliability Assessment) Available Supplies if
Year Type Repeats
Check the box if quantification of available
supplies is not compatible with this table
and is provided elsewhere in the UWMP.
Location: [insert location from UWMP]
Volume Available (AF)
Quantification of available supplies is provided in
this table as either volume only, percent only, or
both.
15,441
15,852 NOTES:
16,225
14,578
12,866
DWR NOTES: Supplier may use multiple versions of Submittal Table 7-1 R if different water sources have different base years and the supplier chooses to report the base years for each water source separately. If a Supplier uses multiple versions of Submittal Table 7-1 R, in the "Note" section of each submittal table, state that multiple versions of Submittal Table 7-1 R are being used and identify the particular water source that is being reported in each submittal table.
Units of measure (AF, CCF, MG ) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.
This table reports the units of measure reported in Submittal Table 2-3. 2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF)
Supply totals
(autofill from Submittal Table 6-
9 R)
16,571 16,692 17,004 17,475 18,073
Use totals
(autofill from Submittal Table 4-
2 R)
16,571 16,692 17,004 17,475 18,073
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.
Supply totals 16,177 16,295 16,599 17,059 17,643
Use totals 16,177 16,295 16,599 17,059 17,643
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply
augmentation benefit
WSCP - use reduction
savings benefit
Revised Surplus/(shortfall)
DWR NOTES : Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.
NOTES
2050 (AF)
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)
2030 (AF) 2035 (AF) 2040 (AF) 2045 (AF) 2050 (AF)
Supply totals 17,374 17,966 18,733 17,298 15,789
Use totals 17,374 17,966 18,733 17,298 15,789
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 17,836 17,966 18,302 18,809 19,453
Use totals 17,836 17,966 18,302 18,809 19,453
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 18,256 18,389 18,733 19,252 19,911
Use totals 18,256 18,389 18,733 19,252 19,911
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 16,403 16,523 16,831 17,298 17,890
Use totals 16,403 16,523 16,831 17,298 17,890
Surplus/(shortfall) 0 0 0 0 0
WSCP - supply augmentation benefit
WSCP - use reduction savings benefit
Revised Surplus/(shortfall)
Supply totals 14,476 14,582 14,855 15,266 15,789
Use totals 14,476 14,582 14,855 15,266 15,789
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
NOTES:
First year
OPTIONAL WSCP Actions Second year
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
OPTIONAL Planned WSCP Actions
Fourth year
2026 Total
Total Water Use (AF) 16,328
Total Supplies (AF) 16,328
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2027 Total
Total Water Use (AF) 17,031
Total Supplies (AF) 17,031
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2028 Total
Total Water Use (AF) 17,706
Total Supplies (AF) 17,706
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2029 Total
Total Water Use (AF) 16,156
Total Supplies (AF) 16,156
Surplus/Shortfall w/o WSCP Action 0
WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
2030 Total
Total Water Use (AF) 14,476
Total Supplies (AF) 14,476
Surplus/Shortfall w/o WSCP Action 0
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) WSCP - supply augmentation benefit (AF)
WSCP - use reduction savings benefit (AF)
Revised Surplus/(shortfall)
NOTES:
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 (use reduction and supply augmentation) Standard
Shortage
Levels
Percent Shortage
Range
Suppliers
Shortage
Levels
Percent
Shortage Range
1 Up to 10%
2 Up to 20%
3 Up to 30%
4 Up to 40%
5 Up to 50%
6 >50%
Submittal Table 8-1: Cross-reference for Standard v s
Supplier Shortage Levels
Water Code Section 10632(a)(3)(B)
Check the box if the Supplier uses the Standard
six levels of water shortage.
Proceed to the next table.
NOTES:
Yes
Volume or
Percentage
Drop down
Shortage Gap
Reduction Value
(May be a range) (AF)
1 Transfers Not applicable (see Notes)
1 Stored Emergency Supply Not applicable (see Notes)
2 Transfers Not applicable (see Notes)
2 Stored Emergency Supply Not applicable (see Notes)
3 Transfers Not applicable (see Notes)
3 Stored Emergency Supply Not applicable (see Notes)
4 Transfers Not applicable (see Notes)
4 Stored Emergency Supply Not applicable (see Notes)
5 Transfers Not applicable (see Notes)
5 Stored Emergency Supply Not applicable (see Notes)
6 Transfers Not applicable (see Notes)
6 Stored Emergency Supply Not applicable (see Notes)
Submittal Table 8-2 Retail: Supply Augmentation and Other Actions Water Code Section 10632(a)(4)(A),(C) and (E)
Add additional rows as needed
NOTES: The City will consider increased production form the Chino Basin using existing facilities to address increased demands. In addition, as discussed in Section 4.4 and 6.1, the City has a storage account to the Chino Basin. The City's current amount of water in managed storage is approximately 126,000 AF which can be recovered in the future as the need arises. As noted on Table 8-3, the City pland to implement demand reducrion measures in the even water supplies from existing sources are not sufficient to meet anticipated demands.
Is the Supplier completing this table using the standard six levels? (yes/no) How much is this going to reduce the
shortage gap?
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.
Shortage
Level
Supply Augmentation Methods and
Other Actions by Water Supplier
Drop down list
These are the only categories that will be
accepted by the WUEdata online submittal tool
Additional Explanation or Reference
(OPTIONAL)
No
Volume or Percentage
Drop down
Shortage Gap
Reduction Value
(May be a range) (AF)
1 Landscape - Restrict or prohibit runoff from
landscape irrigation Volume 1,726 Yes
1 Landscape - Limit landscape irrigation to
specific times Volume 1,726 Yes
1 Other - Prohibit use of potable water for
washing hard surfaces Volume 1,726 Yes
1 Other - Customers must repair leaks, breaks,
and malfunctions in a timely manner Volume 1,726 Yes
1 Other - Require automatic shut of hoses Volume 1,726 Yes 1 CII - Restaurants may only serve water upon
request Volume 1,726 Yes
1 CII - Lodging establishment must offer opt
out of linen service Volume 1,726 Yes
1 Other - Prohibit vehicle washing except at
facilities using recycled or recirculating water Volume 1,726 Yes 2 Other Volume 3,453 All actions under Shortage Level 1 Yes 3 Other Volume 5,179 All actions under Shortage Level 2 Yes 3 Other - Prohibit use of potable water for
construction and dust control Volume 5,179 Yes
4 Other Volume 6,905 All actions under Shortage Level 3 Yes 5 Other Volume 8,632 All actions under Shortage Level 4 Yes 6 Other Volume 8,632 All actions under Shortage Level 5 Yes Is the Supplier completing this table using the standard six levels? (yes/no) Submittal Table 8-3 Retail: Demand Reduction Actions
Water Code Section 10632(a)(4)(B),(D), and (E)
Add additional rows as needed
How much is this going to reduce the shortage
gap?
Shortage
Level
Demand Reduction Actions
Drop down list
These are the only categories that will be
accepted by the WUEdata online submittal tool.
Select those that apply.
Additional Explanation or Reference
(OPTIONAL)
NOTES:
Penalty, Charge, or
Other
Enforcement?
For Retail Suppliers Only
Drop Down List
DWR NOTES: Units of measure (AF, CCF, MG) must remain consistent throughout the UWMP as reported in Submittal Table 2-3.
City Name 60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
City of Chino Hills Yes Yes
City of Ontario Yes Yes
County Name
Drop Down List
60 Day Notice
Drop Down (yes/no)
Notice of Public
Hearing
Drop Down (yes/no)
San Bernardino County Yes Yes
Submittal Table 10-1 Retail: Notification to Cities and Counties Water Code Section 10621(b) and 10642
Add additional rows as needed
Add additional rows as needed
NOTES:
City of Chino 60 Day Notifications
2025 Urban Water Management Plan | B
Appendix B 60 Day Notifications
B
City of Chino Public Notices
2025 Urban Water Management Plan | C
Appendix C Public Notices
C
Documents to be added after public hearing and adoption.
City of Chino Adoption Resolution
2025 Urban Water Management Plan | D
Appendix D Adoption Resolution
D
Documents to be added after public hearing and adoption.
City of Chino DWR Checklist
2025 Urban Water Management Plan | E
Appendix E DWR Checklist
E
Order 2025 Guidebook Location Water Code
Section Summary as Applies to UWMP Subject
Relevant
Submittal
Table
2025 UWMP
Location
1 Chapter 1 10615 A plan shall describe and evaluate sources of supply, reasonable and practical efficient uses, reclamation and demand management activities. Introduction and overview n/a Section 1 , Section 1.2
1 Chapter 1 10630.5
Each plan shall include a simple description of the Supplier’s plan including water availability, future requirements, a strategy for meeting needs, and other pertinent information. Additionally, a Supplier may also choose to include a simple description at the beginning of each chapter.
Plan preparation n/a Section 1.2
2.1 Section 2.1 10620(b) Every person that becomes a Suppl ier shall adopt UWMP within one year after it has become a Supplier. Plan preparation n/a Sections 1.1
2.5 Section 2.5 10644 Supplier shall report the Public Water Systems number, volume of delivered water, and number of connections that are included in this UWMP. Plan preparation 2-1 Section 2.1
2.5 Section 2.5 10644 Supplier shall report if this UWMP is an individual UWMP and whether the Supplier belongs to a regional UWMP or regional alliance. Plan preparation 2-2 Section 2.2
2.5 Section 2.5 10644 Supplier shall report whether the data is in fiscal or calendar years and the units of measure used for reporting water volumes. Plan preparation 2-3 Section 2.2
2.4 Section 2.4 10642
Provide supporting documentation that the Supplier has encourage d active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of the plan and contingency plan.
Plan preparation n/a Section 2.3
2.4 Section 2.4.2 10620(d)(3) Coordinate the preparation of its plan with other appropriate agencies in the area, including other Suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable. Plan preparation n/a Section 2.3
2.4 Section 2.4.1 10631(h) Retail Suppliers will include documentation that they have provided their Wholesale Supplier(s)—if any—with water use projections from that source. Plan preparation 2-4 R Section 2.3/
2.3.1 2.4 Section 2.4.1 10631(h) Wholesale Suppliers will provide their Suppliers with identification and quantification of the existing and planned sources of water available from the Wholesale Supplier to the Supplier during various water year types. Plan preparation 2-4 W N/A 3 Chapter 3.0 10631(a) Describe the Supplier service area. System description n/a Section 3.1/ 3.2
3.3 Section 3.3 10631(a) Describe the climate of the Suppl ier’s service area. System description n/a Section 3.3
3.4 Section 3.4.1 10631(a) Provide the current and proje cted service area populations for 2030, 2035, 2040, 2045 and optionally 2050. System description 3-1 Section 3.4
3.4 Section 3.4.2 10631(a) Describe other social, economic, a nd demographic factors affecting the Supplier’s water management planning. System description n/a Section 3.4
3.5 Section 3.5 10631(a)
Describe the land uses within the service area… include the current and projected land uses within the existing or anticipated service area affecting the Supplier’s water management planning. Describe the land uses within the service area.
System description and
baselines n/a Section 3.5
4.2 Sections 4.2.3 and 4.2.4 10631(d)(1) Quantify past, cu rrent, and projected water use, identifying the uses among water use sectors. System water use 4-1 and 4-2 Section 4 .2
4.3 Section 4.3.1 10631(d)(3)(A) Report the distribution system water loss for each of the five years preceding the plan update. System water use 4-5 Section 4.2.3
4.3 Section 4.3.2 10631(d)(3)(C) Retail Suppliers shall p rovide data to show the distribution loss standards were met. System water use 4-6 Section 4.2.3
4.2 Section 4.2.5.4 10631.1(a) Include projected water use needed for lower income housing projected in the service area of the Supplier. System water use 4-3 Section 4.3
4.2 Section 4.2.5.3 10631(d)(4)(A) In projected water use , include estimates of water savings from adopted codes, plans, and other policies or laws. System water use 4-3 Sectio n 4.3
4.2 Section 4.2.5.3 10631(d)(4)(B) Provide citations of co des, standards, ordinances, or plans used to make water use projections. System water use 4-3 Section 4.2.5 /
Section 4.3
4.2 Section 4.2.5.3 10631(d)(4)(B)(ii)
To the extent that a Supplier reports the information described in subparagraph (A), an urban water Supplier shall… Indicate the extent that the water use projections consider savings from codes, standards, ordinances, or transportation and land use plans. Water use projections that do not account for these water savings shall be noted of that fact.
System water use 4-3 Section 4.3
4.2 Section 4.2.5.6 10635(b) Demands under climate change considerations must be included as part of the drought risk assessment. System water use n/a Section 4.4
5.1 Section 5.1 10608.36 Wholesale Suppliers shall include an assessment of present and proposed future measures, programs, and policies to help their Retail Suppliers achieve targeted water use reductions. Baselines and targets n/a N/A
5.2 Section 5.2 10608.4
Retail Suppliers shall report on their compliance in meeting their water use targets. Reporting requirements will vary depending on whether the Supplier:
- Was considered an urban retail water supplier in 2020, - Met its 2020 target in 2020, or
- Was part of a merger or consolidation since 2020.
Chapter 5 Subsections 5.2.1, 5.2.2, and 5.2.3 address each of these situations.
Baselines and targets 5-1 Section 5.1
6.1 Section 6.1 10631(b)(2) When multiple sources of water supply are identified, describe the management of each supply in relationship to other identified supplies. System supplies n/a Section 6.1
Order 2025 Guidebook Location Water Code
Section Summary as Applies to UWMP Subject
Relevant
Submittal
Table
2025 UWMP
Location
6.1 Sections 6.1 and 6.2 10631(b)(1) Provide a discussion of anticipated supply availability under a normal, single dry year, and a drought lasting five years, as well as more frequent and severe periods of drought, including changes in supply due to climate change. System supplies n/a Sections 6.1,
6.2, 6.9 and
7.2.3 6.2 Section 6.2.2 10631(b)(4)(C)
Indicate whether groundwater is an existing or planned source of water available to the Supplier. If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years.
Water supplies and recycled
water 6-1 Section 6.1
6.2 Section 6.2.2 10631(b)(4)(A)
Indicate whether a groundwater sustainability plan or groundwater management plan has been adopted by the Supplier or if there is any other specific authorization for groundwater management. Include a copy of the plan or authorization. System supplies n/a Section 6.1
6.2 Section 6.2.2 10631(b)(4)(B) Describe the groundwater basin. System supplies n/a Section 6.1
6.2 Section 6.2.2 10631(b)(4)(B) Indicate if the basin has been adjudicated and include a copy of the court order or decree and a description of the amount of water the Supplier has the legal right to pump. System supplies n/a Section 6.1
6.2 Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… (include) information as to whether DWR has identified the basin as a high- or medium-priority basin in the most current official departmental bulletin… Water supplies and recycled
water n/a N/A
6.2 Section 6.2.2 10631(b)(4)(B) For unadjudicated basins… describe efforts by the Supplier to coordinate with sustainability or groundwater agencies to achieve sustainable groundwater conditions.
Water supplies and recycled
water n/a N/A
6.2 Section 6.2.2. 10631(b)(4)(C) If groundwater is identified as an existing or planned source of water… (include) a detailed description and analysis of the location, amount and sufficiency of groundwater pumped by the Supplier for the past five years. System supplies n/a Section 6.1
6.2 Section 6.2.2 10631(b)(4)(D) Provide a detailed descr iption and analysis of the amount and location of groundwater that is projected to be pumped. System supplies 6 -9 Section 6.8
6.1 Section 6.1 10631(b) Identify and quantify the existing and planned sources of water available for 2025, 2030, 2035, 2040, 2045 and optionally 2050. System supplies 6-8 and 6-9 Section 6.8
6.2 Section 6.2.7 10631(c) Describe the opportunities for e xchanges or transfers of water on a short-term or long-term basis. System supplies n/a Section 6.5
6.2 Section 6.2.5 10633(a) Describe the wastewater collection and treatment systems in the Supplier’s service area with quantified amount of collection and treatment and the disposal methods.
System supplies (recycled
water) 6-2 Section 6.3
6.2 Section 6.2.5 10633(b) Describe the quantity of treated wastewater that meets recycled water standards, is being discharged, and is otherwise available for use in a recycled water project.
System supplies (recycled
water) 6-3 Section 6.3
6.2 Section 6.2.5 10633(c) Describe the recycled water curren tly being used in the Supplier's service area. System supplies (recycled water) 6-4 Section 6.3 /
6.3.2 6.2 Section 6.2.5 10633(d) Describe and quantify the potential uses of recycled water and provide a determination of the technical and economic feasibility of those uses.
System supplies (recycled
water) 6-4 Section 6.3 /
6.3.2 6.2 Section 6.2.5 10633(e) Describe the projected use of recycled water within the Supplier's service area at the end of 5, 10, 15, and 20 years, and describe the actual use of recycled water in comparison to uses previously projected.
System supplies (recycled
water) 6-4 and 6-5 Section 6.3 /
6.3.2 6.2 Section 6.2.5 10633(f) Describe the actions that may be taken to encourage the use of recycled water and the projected results of these actions in terms of acre-feet of recycled water used per year.
System supplies (recycled
water) 6-6 Section 6.3 /
6.3.2 6.2 Section 6.2.5 10633(g) Provide a plan for optimizin g the use of recycled water in the Supplier's service area. System supplies (recycled water) n/a Section 6.3 /
6.3.2 6.2 Section 6.2.6 10631(g) Describe desalinated water proj ect opportunities for long-term supply. System supplies 6- 7 Section 6.4
6.2 Section 6.2.10 10631(f) Describe the expected future water supply projects and programs that may be undertaken by the water Supplier to address water supply reliability in average, single-dry, and for a period of drought lasting five consecutive water years. System supplies 6-7 Section 6.7
6.3 Section 6.3 and Appendix
O 10631.2(a) The UWMP must include energy information, a s stated in the code, that a Supplier can readily obtain. System suppliers, energy intensity
O-1A, O-1B, O-
1C, and O-2 Section 6.10
7.1 Section 7.1 10634 Provide information on the quality of existing sources of water available to the Supplier and the manner in which water quality affects water management strategies and supply reliability.
Water supply reliability
assessment n/a Section 7.2.1
7.2 Section 7.2 10635(a)
Service Reliability Assessment: Assess the water supply reliability during normal, dry, and a drought lasting five consecutive water years by comparing the total water supply sources available to the Supplier with the total projected water use over the next 20 years.
Water supply reliability
assessment
7-2, 7-3, and 7-
4 Section 7.2.3
7.2 Section 7.2.3 10620(f) Describe water management tools and options to maximize resources and minimize the need to import water from other regions.
Water supply reliability
assessment n/a Section 7.2.4
7.3 Section 7.3 10635(b) Provide a drought risk assessment as part of information considered in developing the demand management measures and water supply projects.
Water supply reliability
assessment n/a Section 7.3
7.3 Section 7.3 10635(b)(1) Include a description of the data, methodology, and basis for one or more supply shortage conditions that are necessary to conduct a drought risk assessment for a drought period that lasts five consecutive years.
Water supply reliability
assessment n/a Section 7.3.1
Order 2025 Guidebook Location Water Code
Section Summary as Applies to UWMP Subject
Relevant
Submittal
Table
2025 UWMP
Location
7.3 Section 7.3 10635(b)(2) Include a determination of t he reliability of each source of supply under a variety of water shortage conditions. Water supply reliability assessment n/a Section 7.2
7.3 Section 7.3 10635(b)(3) Include a comparison of the total water supply sources available to the Supplier with the total projected water use for the drought period.
Water supply reliability
assessment 7-5 Section 7.3
7.3 Section 7.3 10635(b)(4) Include considerations of the historical drought hydrology, plausible changes on projected supplies and demands under climate change conditions, anticipated regulatory changes, and other locally applicable criteria.
Water supply reliability
assessment n/a Sections 7.2.1
and 6.9
8 Chapter 8 10632(a) Provide a water shortage contingency plan (WSCP) with specified elements below. Water shortage contingency planning n/a Section 8
8 Chapter 8 10632(a)(1) Provide an analysis of water supp ly reliability (from Guidebook Chapter 7) in the WSCP. Water shortage contingency planning n/a Section 8.3
8.2 Section 8.2 10632(a)(2)(A) Provide the written decision-making process and other methods that the Supplier will use each year to determine its water reliability.
Water shortage contingency
planning n/a Section 8.4
8.2 Section 8.2 10632(a)(2)(B) Provide data and methodology to evaluate the Supplier’s water reliability for the current year and one dry year pursuant to factors in the code.
Water shortage contingency
planning n/a Section 8.4.2
8.3 Section 8.3 10632(a)(3)(A)
Define six standard water shortage levels of 10%, 20%, 30%, 40%, 50% shortage, and greater than 50% shortage.
These levels shall be based on supply conditions, including percent reductions in supply, changes in groundwater levels, changes in surface elevation, or other conditions. The shortage levels shall also apply to a catastrophic interruption of supply.
Water shortage contingency
planning n/a Section 8.5
8.3 Section 8.3 10632(a)(3)(B)
Suppliers with an existing WSCP that uses different water shortage levels must cross reference their categories with the six standard categories.
Water shortage contingency
planning 8-1 Section 8.5
8.4 Section 8.4 10632(a)(4)(A) Suppliers with WSCPs that align with the defined shortage levels must specify locally appropriate supply augmentation actions.
Water shortage contingency
planning 8-2 Section 8.6
8.4 Section 8.4 10632(a)(4)(B) Specify locally appropriat e demand reduction actions to adequately respond to shortages. Water shortage contingency planning 8-3 Section 8.6 /
8.6.1 8.4 Section 8.4 10632(a)(4)(C) Specify locally appropriat e operational changes. Water shortage contingency planning 8-2 Section 8.6.3
8.4 Section 8.4 10632(a)(4)(D) Specify additional mandatory prohibitions against specific water use practices that are in addition to State-mandated prohibitions are appropriate to local conditions.
Water shortage contingency
planning Table 8-3 Section 8.6.4
8.4 Section 8.4 10632(a)(4)(E) Estimate the extent to wh ich the gap between supplies and demand will be reduced by implementation of the action. Water shortage contingency planning 8-2 and 8-3 Section 8.6.5
8.4 Section 8.4.6 10632.5 The UWMP shall include a seismic r isk assessment and mitigation plan. Water shortage contingency plan n/a Section 8.6.6
8.5 Section 8.5 10632(a)(5)(A) Suppliers must describe that they will inform customers, the public and others regarding any current or predicted water shortages.
Water shortage contingency
planning n/a Section 8.6.7
8.5 Section 8.5 10632(a)(5)(B),
10632(a)(5)(C)
Suppliers must describe that they will inform customers, the public and others regarding any shortage response actions triggered or anticipated to be triggered and other relevant communications.
Water shortage contingency
planning n/a Section 8.7
8.6 Section 8.6 10632(a)(6) Retail Supplier must describe how it will ensure compliance with and enforce provisions of the WSCP. Water shortage contingency planning n/a Section 8.8
8.7 Section 8.7 10632(a)(7)(A) Describe the legal authori ty that empowers the Supplier to enforce shortage response actions. Water shortage contingency planning n/a Section 8.9
8.7 Section 8.7 10632(a)(7)(B) Provide a statement that the Supplier will declare a water shortage emergency per Water Code Chapter 3. Water Shortage Emergencies .
Water shortage contingency
planning n/a Section 8.9
8.7 Section 8.7 10632(a)(7)(C) Provide a statement that the Supplier will coordinate with any city or county within which it provides water for the possible proclamation of a local emergency.
Water shortage contingency
planning n/a Section 8.9
8.8 Section 8.8 10632(a)(8)(A) Describe the potential rev enue reductions and expense increases associated with activated shortage response actions. Water shortage contingency planning n/a Section 8.10
8.8 Section 8.8 10632(a)(8)(B) Provide a description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions.
Water shortage contingency
planning n/a Section 8.10
8.8 Section 8.8 10632(a)(8)(C) Retail Suppliers must describe the cost of compliance with Water Code Chapter 3.3, Excessive Residential Water Use During Drought .
Water shortage contingency
planning n/a Section 8.10
8.9 Section 8.9 10632(a)(9) Retail Suppliers must describe the monitoring and reporting requirements and procedures that ensure appropriate data are collected, tracked, and analyzed for purposes of monitoring customer compliance.
Water shortage contingency
planning n/a Section 8.11
8.10 Section 8.10 10632(a)(10) Describe reevaluation and improvement procedures for monitoring and evaluation the WSCP to ensure risk tolerance is adequate and appropriate water shortage mitigation strategies are implemented.
Water shortage contingency
planning n/a Section 8.12
8.11 Section 8.11 10632(b) Analyze and define water features that are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas.
Water shortage contingency
planning n/a Section 8.13
Order 2025 Guidebook Location Water Code
Section Summary as Applies to UWMP Subject
Relevant
Submittal
Table
2025 UWMP
Location
8.12 Section 8.12 10632(c) Make available the WSCP to customers and any city or county where it provides water within 30 days after adoption of the plan.
Water shortage contingency
planning n/a Section 8.14
9.1 Sections 9.1 10631(e)(1) Retail Suppliers shall provide a description of the nature and extent of each demand management measure implemented over the past five years. The description will address specific measures listed in code.
Demand management
measures n/a Section 9.2
9.2 Sections 9.2 10631(e)(2) Wholesale Suppliers shall describe specific demand management measures listed in code, their distribution system asset management program, and Supplier assistance program.
Demand management
measures n/a N/A
10 Chapter 10 10608.26(a) Retail Suppliers shall conduct a public hearing to discuss adoption, implementation, and economic impact of water use targets (recommended to discuss compliance).
Plan adoption, submittal, and
implementation n/a Section 10.1
10.2 Section 10.2.1 10621(b) Notify, at least 60 days prior to the public hearing, any city or county within which the Supplier provides water that the Supplier will be reviewing the UWMP and considering amendments or changes to the plan.
Plan adoption, submittal, and
implementation 10-1 Section 10.1
10.4 Section 10.4 10621(f) Each urban water Supplier shal l update and submit its 2025 plan to DWR by July 1, 202 6. Plan adoption, submittal, and implementation n/a Section 10.2
10.2 Sections 10.2.2, 10.3, and
10.5 10642 Provide supporting documentation that the Supplier made the UWMP and WSCP available for public inspection, published notice of the public hearing, and held a public hearing about the UWMP and WSCP.
Plan adoption, submittal, and
implementation n/a Section 10.1
10.2 Section 10.2.2 10642 The Supplier is to provide the time and place of the hearing to any city or county within which the Supplier provides water.
Plan adoption, submittal, and
implementation 10-1 Section 10.1
10.3 Section 10.3.2 10642 Provide supporting documentatio n that the UWMP and WSCP has been adopted as prepared or modified. Plan adoption, submittal, and implementation n/a Section 10.2
10.4 Section 10.4 10644(a) Provide supporting documentati on that the Supplier has submitted their UWMP to the California State Library. Plan adoption, submittal, and implementation n/a Section 10.2
10.4 Section 10.4 10644(a)(1) Provide supporting documentation that the Supplier has submitted their UWMP to any city or county within which the Supplier provides water no later than 30 days after adoption.
Plan adoption, submittal, and
implementation n/a Section 10.3
10.4 Sections 10.4.1 and
10.4.2 10644(a)(2) The UWMP, or amendments to the UWMP, submi tted to DWR shall be submitted electronically. Plan adoption, submittal, and implementation n/a Section 10.2
10.7 Section 10.7.2 10644(b) If revised, submit a copy of the WSCP to DWR within 30 days of adoption. Plan adoption, submittal, and implementation n/a Section 10.4
10.5 Section 10.5 10645(a) Provide supporting documentation that, not later than 30 days after filing a copy of its UWMP with DWR, the Supplier has or will make the plan available for public review during normal business hours.
Plan adoption, submittal, and
implementation n/a Section 10.3
10.5 Section 10.5 10645(b) Provide supporting documentation that, not later than 30 days after filing a copy of its WSCP with DWR, the Supplier has or will make the plan available for public review during normal business hours.
Plan adoption, submittal, and
implementation n/a Section 10.3
10.6 Section 10.6 10621(c) If Supplier is regulated by the Public Utilities Commission, include its plan and contingency plan as part of its general rate case filings.
Plan adoption, submittal, and
implementation n/a N/A
City of Chino Chino Basin Judgment
2025 Urban Water Management Plan | F
Appendix F Chino Basin Judgment
F
The Chino Basin 1978 Judgement can be found here.
City of Chino WFA and City of Chino Purchase
Agreement
2025 Urban Water Management Plan | G
Appendix G WFA and City of Chino
Purchase Agreement
G
City of Chino Water Conservation Ordinances
2025 Urban Water Management Plan | H
Appendix H Water Conservation
Ordinances
H
Ordinance No. 2009-04 can be found here. Ordinance No. 2015-04 can be found here.