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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br /> Figure 9-2. Hetch Hetchy Water System <br /> <br />San Mateo County maintains the infrastructure for County Service Area (CSA) 7 and CSA 11, the two local water <br />systems within its borders: <br /> CSA 7 includes an intake and pump in Alpine Creek, a water treatment plant, a 500,000-gallon storage <br />tank, and a distribution system. The treatment plant was constructed in the early 1990s, but parts of the <br />distribution system date to the 1920s. <br /> CSA 11 was established in 1988 and consists of two wells, one 135,000-gallon distribution tank, and a <br />distribution system. Water flows from the distribution tank through the water system under force of <br />gravity; no distribution pumps are required. CSA 11 was determined to be necessary after relatively high <br />concentrations of nitrate and other naturally occurring salts were found in local groundwater sources, <br />raising concern that continued use of previously used small domestic wells could lead to unintended <br />health consequences. <br /> <br />Water Supply Strategy <br />The Bay Area Water Supply Conservation Agency (BAWSCA) is the main water provider for much of the Bay <br />Area. It allows San Mateo County and its cities, water districts, and private utilities to coordinate to ensure the <br />continual water supply necessary to maintain health, safety, and economic wellbeing of the community. <br />BAWSCA agencies manage two-thirds of water consumption from the Hetch Hetchy Water System, providing <br />water to 2.4 million people in San Francisco, Santa Clara, Alameda, and San Mateo Counties. In San Mateo <br />County, BAWSCA services Brisbane, Burlingame, Daly City, East Palo Alto, Hillsborough, Menlo Park, <br />Millbrae, Redwood City, San Bruno, Coastside County Water District, Estero Municipal Improvement District, <br />Guadalupe Valley Municipal Improvement District, Mid-Peninsula Water District, Westborough Water District, <br />and California Water Service Company (private utility). <br /> <br />BAWSCA applies a long-term water supply strategy for its customers throughout the Bay Area. This strategy <br />recognizes that drought year shortfalls can be significant, resulting in system-wide cutbacks of up to 20 percent. <br />Impacts of water shortages are regional and can lead to secondary detrimental economic effects. BAWSCA <br /> <br /> <br /> <br />9-6