Urban Water Management Plan
Urban Water Management Plan
In 1983, the State of California Legislature enacted the Urban Water Management Planning Act (UWMP Act). The law required an urban water supplier provides water for municipal purposes to more than 3,000 customers or serving more than 3,000 acre-feet per year (AFY) to adopt a UWMP every five years. This UWMP must demonstrate water supply reliability under both normal and drought conditions. 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 DWR, the State Water Resources Control Board, and the California Legislature. Accordingly, the UWMP Act has grown to address changing conditions. The current requirements are found in CWC Sections 10610-10656 and 10608.
DWR provides guidance for urban water suppliers by preparing a UWMP Guidebook (DWR, 2026), 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 plans to make sure they have addressed the requirements and submits a report to the California Legislature summarizing the status of the plans for each five-year cycle. The final 2025 UWMP Guidebook, released in January 2026, was used to develop this 2025 UWMP.
The purpose of this UWMP is for the District 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 long-range regional 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.
CWC 10632 also includes requirements for suppliers to prepare a Water Shortage Contingency Plan (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 is referenced and attached in Appendix C to the 2025 UWMP.
Appendix A Final - UWMP Checklist
Appendix B Final - UWMP Tables
Appendix D Final - Delta Reliance