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City of Pleasanton | Water Shortage Contingency Plan <br /> Public Draft | May 2026 <br /> 13 EKI Environment & Water, Inc. <br />an emergency, the City has two interties with DSRSD and one intertie with Livermore. Per agreements <br />with DSRSD and Livermore made in 1996 and 2011, respectively, the City can receive from each agency a <br />reasonable quantity of water required during the emergency. <br />The City has mutual aid agreements with the San Francisco Public Utilities Commission (SFPUC), <br />Livermore, DSRSD, and Zone 7. The City also participates in the Water/Wastewater Agency Response <br />Network (WARN), a statewide public utility mutual assistance organization. After exhausting its own <br />resources, the City can call on these neighboring agencies for aid. <br />4.5.1 Interrupted Supply from Zone 7 <br />If imported deliveries are interrupted, the City will coordinate with Zone 7 on available groundwater and <br />stored supplies and implement applicable shortage stage actions immediately. <br />Zone 7 has emergency generators (both portable and dedicated) at strategic locations in preparation for <br />a regional power outage. These generators would allow both the Del Valle Water Treatment Plant and the <br />Patterson Pass Water Treatment Plant to continue operating even under a power outage. Assuming no <br />interruptions in surface water supply, Zone 7 would be able to provide continued service to all treated <br />water contractors. If necessary to meet demand, Zone 7 would also operate groundwater wells, which <br />have either a dedicated generator in place or have the necessary hook-ups to receive power from a <br />portable generator. If the power failure were to occur during the high-demand summer season, Zone 7 <br />may be unable to meet hourly peak demands throughout the transmission system. Zone 7 would work <br />closely with the City and other retailers to manage demands to minimize impacts. <br />4.5.1.1 Unavailable SWP Water <br />Zone 7, and therefore Pleasanton, relies heavily on the SWP for water supply. If SWP supplies are <br />unavailable, the City will rely on available alternative deliveries and groundwater, evaluate projected <br />deficits, and escalate stage actions as needed. <br />Under this scenario and under current conditions, Zone 7 estimates that it would be able to make full <br />deliveries to the retailers during non-summer months using a combination of groundwater and water <br />stored in Lake Del Valle. During the peak demand of the summer months, however, Zone 7 will need to <br />reduce deliveries to its retailers, including the City. Zone 7’s analysis shows that Zone 7 has sufficient <br />groundwater supply and pumping ability to serve the indoor water use needs of the service area over a <br />one-year period; the availability of water supply for outdoor water use during the summer months will <br />depend on the amount of water available in Lake Del Valle. Depending on timing and degree of recovery, <br />the City may activate one of the water shortage levels in Section 3. <br />4.5.1.2 Unavailable Zone 7 Water <br />If one or more Zone 7 turnouts are unusable, the City will reroute available supplies where feasible and <br />prioritize service reliability while implementing shortage response measures. <br />4.5.2 Area-Wide Electrical Power Failure <br />During prolonged power outages, the City will rely on backup power and emergency operations where <br />available, prioritize critical facilities, and maintain shortage response messaging. Additionally, the City <br />could receive water from emergency interties with DSRSD and Livermore if necessary. <br />4.6 Seismic Risk Assessment and Mitigation Plan <br />CWC §10632.5(a) requires that UWMPs assess seismic risk and include a mitigation plan for the water <br />system’s seismic vulnerabilities and allows for incorporating a Local Hazard Mitigation Plan (LHMP) to <br />meet this requirement, if the LHMP addresses seismic risk. Along with DSRSD and the cities of Dublin and