Key regional planning and other documents that were used to inform the preparation of IRWD’s UWMP include the following: • Metropolitan Water District 2025 Draft UWMP • Metropolitan Water District 2025 Water Shortage Contingency Plan • Metropolitan Water District 2020 Integration Water Resources Plan (IRP) Regional Needs Assessment • 2025 Orange County Water Demand Projection Model Technical Memorandum (MWDOC) • Orange County Water District 2022 Basin 8-1 Alternative Update • Orange County Water and Wastewater Multi-Jurisdictional Hazard Mitigation Plan • Orange County Water District 2025 OCWD Resilience Plan Coordination with Water Suppliers and the Community Law 10620(d)(3) Each urban water supplier shall coordinate the preparation of its plan with other appropriate agencies in the area, including other water suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable. 10621(b) Every urban water supplier required to prepare a plan pursuant to the part shall, at least 60 days before the public hearing on the plan required by Section 10642, notify any city or county within which the supplier provides water supplies that the urban water supplier will be reviewing the plan and considering amendments or changes to the plan. 10642 Each urban water supplier shall encourage the active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of both the plan and the water shortage contingency plan. IRWD serves seven cities, the County, and portions of unincorporated Orange County. Land use within IRWD’s service area has been changing steadily from an agricultural community to an urban area with significant development. IRWD coordinates closely on city general planning with the cities located within IRWD’s service area to determine IRWD’s full build-out demands, especially for currently undeveloped or redeveloping areas. On February 3, 2026, IRWD notified the County of Orange and the seven cities within the IRWD service area (City of Costa Mesa, City of Irvine, City of Lake Forest, City of Newport Beach, City of Orange, and City of Tustin) that IRWD would be reviewing its 2020 UWMP and considering changes to the plan for the 2025 UWMP. These notification letters provided the opportunity for the cities and County of Orange to submit comments regarding IRWD’s 2025 UWMP during the update process. IRWD did not receive any comments from the cities or the County during the preparation of the 2025 UWMP.
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IRWD – 2025 Urban Water Management Plan
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