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Santa Ana 2020 Urban Water Management Plan <br />arcadis.com <br />6-13 <br />approximately 76% of the City’s water supply portfolio for FY 2019-20 – from the OC Basin to meet its <br />demands. <br />This section describes the OC Basin and the management measures taken by OCWD, the basin <br />manager to optimize local supply and minimize overdraft. This section also provides information on <br />historical groundwater production as well as a 25-year projection of the City's groundwater supply. <br />The OCWD was formed in 1933 by a special legislative act of the California State Legislature to protect <br />and manage the County's vast, natural, groundwater supply using the best available technology and <br />defend its water rights to the OC Basin. This legislation is found in the State of California Statutes, Water <br />– Uncodified Acts, Act 5683, as amended. The OC Basin is managed by OCWD under the Act, which <br />functions as a statutorily-imposed physical solution. The OCWD Management Area includes <br />approximately 89% of the land area of the OC Basin, and 98% of all groundwater production occurs <br />within the area. OCWD monitors the basin by collecting groundwater elevation and quality data from wells <br />and manages an electronic database that stores water elevation, water quality, production, recharge, and <br />other data on over 2,000 wells and facilities within and outside OCWD boundaries (City of La Habra <br />et al., 2017). <br />Groundwater levels are managed within a safe basin operating range to protect the long-term <br />sustainability of the OC Basin and to protect against land subsidence. OCWD regulates groundwater <br />levels in the OC Basin by regulating the annual amount of pumping and setting the Basin Production <br />Percentage (BPP) for the water year. As defined in the District Act, the BPP is the ratio of water produced <br />from groundwater supplies within the district to all water produced within the district from both <br />supplemental sources and groundwater within the district (OCWD, 2020). On a per agency basis <br />including the City, the BPP is the total percentage amount of groundwater allowed to be produced <br />towards that agency’s or city’s demand. For the City, the remaining percentage of potable water demand <br />is achieved through MET water. <br />6.3.1 Historical Groundwater Production <br />The City pumps groundwater through its 21 active operating groundwater wells. One of the City’s wells is <br />currently offline but is being rehabilitated with goals to be completed by the end of 2021. The City has <br />experienced relative stability in the groundwater volume pumped for the last five years (Table 6-4).