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FOREWORD <br /> During an average year about forty percent of California's water supply comes from <br /> ground water. Ground water is used for agricultural, industrial, domestic, and municipal <br /> water supplies. Protecting the quality of California's ground water is essential to <br /> California's future. <br /> Improperly constructed wells can allow pollution of ground water to the point that the <br /> water is either unusable or it requires expensive treatment. The California Water Code <br /> requires the Department of Water Resources (DWR) to develop minimum standards <br /> for water wells, monitoring wells, and cathodic protection wells to protect ground water <br /> quality. <br /> This bulletin is a supplement to DWR Bulletin 74-81, Writer Well Standards-: Stare of <br /> Califonda, December 1981. Standards is bulletin 74- 1 and this bulletin are minimum <br /> requirements for construction, alteration, maintenance, and destruction of water wells, <br /> nlotiitnring wells, and cathodic protection wells in California. <br /> This bulletin was prepared in cooperation with the State Water Resources Control <br /> Board. The Board adopted a model water well, monitoring well, and cathodic <br /> protection well ordinance that implernents DWR well standards. All California cities <br /> and counties, and some water agencies are required to enact local well ordinances that <br /> meet or exceed DWR standards, ar they must enforce the Board's model ordinance as <br /> if it were their own. <br /> Sometimes well standards adopted by local agencies must be mere stringent than <br /> DWl 's statewide standards because of local conditions. Local agencies play a critical <br /> role in protecting ground water quality. <br /> Continued cooperation is needed between the public, industry, local agencies, and tyre <br /> State to ensure that these well standards remain adequate and are put into practice. <br /> California's water supply future depends on this cooperation. <br /> David N. Kennedy, Director <br /> Department of Water Resources <br />