Item 28 - Urban Water Management Plan and Water Shortage Contingency Plan

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Santa Ana 2020 Water Shortage Contingency Plan 3-12 Recovery: This phase involved restoring systems to normal, in which short-term recovery actions are taken to assess the damage and return vital life-support systems to minimum operating standards, while long-term recovery actions have the potential to continue for many years. Mitigation/Prevention: These actions prevent the occurrence of an emergency or reduce the area’s vulnerability in ways that minimize the adverse impacts of a disaster or emergency. MWDOC’s HMP outlines threats and identifies mitigation projects. The EOC Action Plans (EAP) provide frameworks for EOC staff to respond to different situations with the objectives and steps required to complete them, which will in turn serve the WEROC member agencies. In the event of an emergency which results in a catastrophic water shortage, the City will declare a water shortage condition of up to Level 6 for the impacted area depending on the severity of the event, and coordination with WEROC is anticipated to begin at Level 4 or greater (WEROC, 2018). City of Santa Ana Emergency Response Plan The City will also refer to its current American Water Infrastructure Act Risk and Resilience Assessment and Emergency Response Plan in the event of a locally isolated catastrophic supply interruption (Santa Ana, 2020; Santa Ana, 2021b). 3.4.6 Seismic Risk Assessment and Mitigation Plan Per the Water Code Section 10632.5, Suppliers are required to assess seismic risk to water supplies as part of their WSCP. The plan also must include the mitigation plan for the seismic risk(s). Given the great distances that imported supplies travel to reach Orange County, the region is vulnerable to interruptions along hundreds of miles aqueducts, pipelines and other facilities associated with delivering the supplies to the region. Additionally, the infrastructure in place to deliver supplies are susceptible to damage from earthquakes and other disasters. In lieu of conducting a seismic risk assessment specific to the City’s 2020 UWMP, the City has included the previously prepared regional HMP by MWDOC as the regional imported water wholesaler that is required under the federal Disaster Mitigation Act of 2000 (Public Law 106-390). MWDOC’s HMP identified that the overarching goals of the HMP were the same across the region, which include:  Goal 1: Minimize vulnerabilities of critical infrastructure to minimize damages and loss of life and injury to human life caused by hazards.  Goal 2: Minimize security risks to water and wastewater infrastructure.  Goal 3: Minimize interruption to water and wastewater utilities.  Goal 4: Improve public outreach, awareness, education, and preparedness for hazards in order to increase community resilience.  Goal 5: Eliminate or minimize wastewater spills and overflows.  Goal 6: Protect water quality and supply, critical aquatic resources, and habitat to ensure a safe water supply.  Goal 7: Strengthen Emergency Response Services to ensure preparedness, response, and recovery during any major or multi-hazard event. MWDOC’s HMP evaluates hazards applicable to all jurisdictions in its entire planning area, prioritized based on probability, location, maximum probable extent, and secondary impacts. The identification of hazards is highly dependent on the location of facilities within the City’s jurisdiction and takes into consideration the history of the