Executive Summary and Simple Lay Description of the UWMP Findings
Urban Water Management Plan
In accordance with the Urban Water Management Planning Act, Irvine Ranch Water District (IRWD, District) has prepared the following 2025 Urban Water Management Plan (UWMP, Plan). The Urban Water Management Planning Act is a series of requirements outlined in the California Water Code (CWC). This 2025 UWMP is an update to IRWD’s 2020 UWMP and is in compliance with the requirements of the CWC. IRWD’s 2025 UWMP includes an assessment of its water service reliability to ensure that adequate water supplies are available to meet existing and future demands. It presents an assessment of IRWD’s water service reliability, describes and evaluates sources of water supply, efficient uses of water, demand management measures, recycled water opportunities, and other relevant information and programs through the year 2045. In addition to the water reliability assessments, the plan includes a seismic risk and mitigation assessment, an energy intensity analysis, an evaluation of frequent and severe periods of droughts (as described in the Drought Risk Assessment) and the preparation of an update to IRWD’s Water Shortage Contingency Plan (WSCP). The 2025 UWMP was developed in coordination with the cities and county served by IRWD as well as the regional wholesale water suppliers.
IRWD Water Service Reliability
Since its establishment in 1961, IRWD has conducted comprehensive long-term planning to ensure that sufficient water supplies are available to meet demands in its service area. IRWD’s Water Resources Master Plan (WRMP), IRWD’s primary planning document provides a review of current and potential future potable and non-potable water supplies and development of a preferred supply mix focusing on reliability. The WRMP identifies the optimum mix of water resources to meet normal, dry year, extended drought and emergency requirements. In its planning process, IRWD utilizes historical water use to project existing and planned uses. For purposes of this UWMP, IRWD used normal year demand forecasts developed by regional wholesaler, the Municipal Water District of Orange County (MWDOC).
ES - 1 IRWD – 2025 Urban Water Management Plan – Executive Summary and Lay Description
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