IRWD also has prepared an Emergency Operations Plan, updated in September 2025, that includes an extensive specific hazard response plan for earthquakes including mitigation action, response actions, responsible authorities, and phases of response. Furthermore, IRWD partnered with WEROC and its member agencies to prepare the Orange County Water and Wastewater Multi-Jurisdictional Hazard Mitigation Plan (MJHMP) which was approved by FEMA and adopted in 2025. This plan aims to improve local resilience to hazard events and to reduce water and wastewater infrastructure vulnerabilities and risks due to identified hazards of concern. IRWD’s section of the MJHMP is included as Exhibit C . As part of its Dam Safety Program, IRWD has evaluated the seismic performance of its five dams and reservoirs. IRWD continually monitors, inspects and maintains its dams and reservoirs. Its engineers and dam safety experts have implemented a state-of-the-art Dam Safety Program that meets or exceeds all current state standards and provides a roadmap for other agencies to follow. This new program combines the traditional tried and true safety standards with a modern Risk-Informed Decision-Making process, known as RIDM. RIDM is a rigorous, systematic and thorough approach to dam safety that identifies and reduces any risks. Incorporating RIDM results in one of the most robust dam safety and reservoir management programs in the nation. IRWD’s Dam Safety Program builds on industry best practices to ensure that our dams and reservoirs will be safe. A. Excerpts from IRWD Water System Risk and Resilience Assessment (RRA) Due to the sensitive nature of IRWD’s RRA report, certain sections are not appropriate to be released as part of the UWMP and WSCP. The following excerpts have been pulled from the existing RRA Seismic Risk Assessment and Mitigation plan to demonstrate the essential content in assessing seismic risk. I. Overview of Water Emergency Preparedness in Orange County Water distribution and treatment in Orange County involves dozens of agencies and utilities working together and relies on integrated regional systems and facilities. There are many retail water utilities in Orange County, each with its own distinct service area and sources of potable water. The retail water agencies include water districts and city water departments. MWDOC serves more than 2.3 million Orange County, California, residents through 28 cities, water districts, and investor-owned utilities or MAs. MWDOC’s service area covers all of Orange County except the cities of Anaheim, Fullerton, and Santa Ana. WEROC, administered by MWDOC, coordinates emergency response and mutual aid planning for all 35 Orange County water and wastewater agencies including Anaheim, Fullerton, and Santa Ana. WEROC provides its participating agencies and volunteer staff with planning support, emergency preparedness, and response training. In the event of a major emergency affecting Orange County, these volunteers would mobilize at the WEROC emergency operations centers to coordinate response. WEROC works closely with the
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IRWD – 2025 Water Shortage Contingency Plan
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