• Bajagua Water Treatment Project, LLC - Private company in charge of the wastewater treatment plant to be built in Mexico to treat sewage generated in Tijuana.
• Helix Water District - Serving the cities of La Mesa, El Cajon, Lemon Grove and unincorporated areas of San Diego County.
• Olivenhain Municipal Water District - Covers 48 square miles of North San Diego County, and is responsible for the operation of the Elfin Forest Recreational Reserve.
• Otay Water District - Public water and sewer agency serving communities of southeastern San Diego County
• Padre Dam Municipal Water District - Information about local water service, quality and conservation, and about the Santee Lakes Regional Park.
• San Diego County Water Authority - Water wholesaler, created to administer the region's Colorado River water rights, import water and take over the operation of the aqueduct from the Navy. Site provides history, news, and education.
• Sweetwater Authority - Provides water for National City, Bonita and the western and central portions of Chula Vista.
• Water Department City of San Diego - Maintains and operates water lines, water treatment plants, pressure zones and offers public recreational use of its reservoirs. Sewer and water rates, and online bill paying information.

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