Calleguas Municipal Water District provides supply of supplemental water to residences and businesses in the southern Ventura County of California. It sources water supply from the California State Water Project. The district provides water that adheres to federal and state water quality standards and distributes it through local water agencies and companies. The district also provides various water conservation programs for schools, companies and agricultural users. It serves more than 350 square miles of area. The district s Web site provides details on prices and surcharges of water. Calleguas Municipal Water District, established in 1953, has its office in Thousand Oaks, Calif.