SAWPA is made up of the following five water agencies, which serve residents living within the Santa Ana Watershed and manage the water in the watershed.
Eastern Municipal Water District
EMWD serves the cities of Hemet, Menifee, Moreno Valley, Murrieta, Perris, San Jacinto, and Temecula. It also sells water to Lake Hemet Municipal Water District, Nuevo Water Company, Rancho California Water District, and Riverside Highland Water Company. Reaching into Box Springs Canyon Park in the north and Temecula in the south, EMWD roughly follows I-215. Its coverage area stops just short of Canyon Lake in the west and Mt. San Jacinto State Park in the east.
Western Municipal Water District
Western serves roughly 23,000 retail and eight wholesale customers with water from the Colorado River, State Water Project and local groundwater. As a member agency of the Metropolitan Water District of Southern California (MWD), Western provides supplemental water to the cities of Corona, Norco, and Riverside and the water agencies of Box Springs Mutual, Eagle Valley Mutual, Elsinore Valley, Lee Lake and Rancho California. Jurupa Community Services District and Rubidoux Community Services Distrist are also within the District’s general service area. Western serves customers directly in Orangecrest, Mission Grove, El Sobrante, Eagle Valley, Temescal Canyon, Woodcrest, Lake Mathews, portions of Mead Valley and Perris, and March Air Reserve Base. Lake Mathews and Lake Elsinore lie within its boundaries.
Inland Empire Utilities Agency
IEUA sells water to the following cities: Chino, Chino Hills, Fontana, Montclair, Ontario and Upland. They also sell water to the Cucamonga Valley Water District, the Fontana Water Company, and the Monte Vista Water District.
San Bernardino Valley Municipal Water District
SBVWD sells water to the cities of Colton, Fontana, Loma Linda, Redlands, Rialto and San Bernardino. They also sell water to the following water companies: Fontana Water Company, East Valley Water District, Marygold Mutual Water Company, Muscoy Mutual Water Company, Riverside Highland Water Company, Terrace Water Company, West Valley Water District, Western Heights Water Company, and Yucaipa Valley Water District.
Orange County Water District
Orange County Water District (OCWD) manages the large groundwater basin that provides reliable, high-quality groundwater to 19 municipal water agencies and special districts that serve 2.4 million customers in north and central Orange County.
It provides water to the cities of Anaheim, Buena Park, Fountain Valley, Fullerton, Garden Grove, Huntington Beach, La Palma, Newport Beach, Orange, Santa Ana, Seal Beach, Tustin, and Westminster. OCWD also provides water to East Orange County Water District, Golden State Water Company, Irvine Ranch Water District, Mesa Consolidated Water District, Serrano Water District, and Yorba Linda Water District.