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Section 1 | Introduction
1.1 Urban Water Management Planning Act
This 2025 Urban Water Management Plan (UWMP or Plan) of the Irvine Ranch Water District (IRWD, District) has been prepared in compliance with the California Water Code (CWC) Sections 10610 through 10657, which is known as the Urban Water Management Planning Act (Act). These sections were added by Statute 1983, Chapter 1009, and became effective on January 1, 1984. This UWMP was also prepared in compliance with Section 10608.36 of SB X7- 7, which was enacted in 2009. The Act requires that every urban retail water supplier, providing potable municipal water to more than 3,000 customers or supplying more than 3,000 acre-feet of potable water annually, to prepare and adopt an urban water management plan. IRWD’s 2025 UWMP was prepared in accordance with the requirement that urban water purveyors submit a plan to the California Department of Water Resources (DWR), addressing water supply, demands, conservation measures, and water recycling among other things. IRWD prepared this 2025 UWMP in coordination with the other agencies as indicated. IRWD utilized the DWR “Urban Water Management Plan Guidebook” January 2026 (UWMP Guidebook) in the preparation of this UWMP. There have been no requirement changes since the 2020 UWMP was prepared; only minor changes to definitions. Section 1 provides information on IRWD, the purpose of IRWD Water Resource Planning, and a description of how the UWMP is organized.
1.2 Irvine Ranch Water District (IRWD)
IRWD is a multi-service agency responsible for providing domestic water service, sewage collection and treatment, water recycling, and urban runoff natural treatment in Central Orange County, California. IRWD provides water service to approximately 453,000 residents. IRWD encompasses approximately 181-square miles extending from the Pacific Coast to the foothills of the Santa Ana Mountains, covering elevations ranging from sea level to 1,700 feet. IRWD serves the City of Irvine and portions of Costa Mesa, Lake Forest, Newport Beach, Orange, Tustin, Santa Ana and unincorporated areas of Orange County. Established in 1961 as an independent special district organized under the California Water District Code, IRWD is governed by a five-member, publicly elected Board of Directors responsible for the District’s policies and decision making. Day-to-day operations are supervised by the General Manager and District staff.
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IRWD – 2025 Urban Water Management Plan
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