Water Agencies
- Alameda County Water District
- Alpine Springs County Water District
- Amador Water Agency
- Aromas Water District
- Arrowbear Park County Water District
- Bella Vista Water District
- Beaumont-Cherry Valley Water District
- Big Bear Municipal Water District
- Bighorn-Desert View Water Agency
- Borrego Water District
- Buckingham Park Water District
- Burney Water District
- Cachuma Operation And Maintenance Board
- Calleguas Municipal Water District
- Callayomi County Water District
- California Pines Community Services District
- Carpinteria Valley Water District
- Casitas Municipal Water District
- Calaveras County Water District
- Central Basin Municipal Water District
- Central Water District
- Channel Islands Beach Community Services District
- Chino Basin Water Conservation District
- Chino Basin Watermaster
- Citrus Heights Water District
- Clear Creek Community Services District
- Clearlake Oaks County Water District
- Coachella Valley Water District
- Coastside County Water District
- Contra Costa Water District
- Crestline Lake Arrowhead Water Agency
- Crestline Village Water District
- Crescenta Valley Water District
- Cucamonga Valley Water District
- Del Paso Manor Water District
- Del Puerto Water District
- Denair Community Services District
- Desert Water Agency
- Diablo Water District
- Dublin San Ramon Services District
- East Bay Dischargers Authority
- East Orange County Water District
- East Palo Alto Sanitary District
- East Valley Water District
- Eastern Municipal Water District
- El Dorado County Water Agency
- El Dorado Irrigation District
- Encina Wastewater Authority
- Fair Oaks Water District
- Fern Valley Water District
- Florin County Water District
- Florin Resource Conservation District Elk Grove Water District
- Foothill Municipal Water District
- Goleta Water District
- Goleta West Sanitary District
- Granada Community Services District
- Green Valley County Water District
- Gualala Community Services District
- Helix Water District
- Heritage Ranch Community Services District
- Hesperia Water District
- Hi-Desert Water District
- Hidden Valley Lake Community Services District
- Hilton Creek Community Services District
- Indian Wells Valley Water District
- Inland Empire Utilities Agency
- Irvine Ranch Water District
- Joshua Basin Water District
- Jurupa Community Services District
- Kaweah Delta Water Conservation District
- Kensington Community Services District
- Kinneloa Irrigation District
- Konocti County Water District
- La Habra Heights County Water District
- La Puente Valley County Water District
- Laguna Beach County Water District
- Lake Arrowhead Community Services District
- Lake Don Pedro Community Services District
- Lake Hemet Municipal Water District
- Lake Shastina Community Services District
- Lakeside Water District
- Las Gallinas Valley Sanitary District of Marin County
- Las Virgenes Municipal Water District
- Lassen County Waterworks District No. 1
- Linda County Water District
- Littlerock Creek Irrigation District
- Los Alamos Community Services District
- Los Osos Community Services District
- Lower Lake County Waterworks District No. 1
- Majestic Pines Community Services District
- Main San Gabriel Basin Watermaster
- Marin Municipal Water District
- Marina Coast Water District
- McCloud Community Services District
- Mckinleyville Community Services District
- Meiners Oaks County Water District
- Mendocino City Community Services District
- Mendocino County Russian River Flood Control & Water Conservation Improvement District
- Metropolitan Water District of Southern California
- Mesa Water District
- Mid-Peninsula Water District
- Midway Heights County Water District
- Millview County Water District
- Mission Springs Water District
- Mojave Water Agency
- Monte Vista County Water District
- Montecito Water District
- Monterey County Water Resources Agency
- Monterey One Water
- Monterey Peninsula Water Management District
- Moulton-Niguel Water District
- Municipal Water District of Orange County
- Nipomo Community Services District
- North Coast County Water District
- North County Water District
- North Marin Water District
- North of The River Municipal Water District
- Olympic Valley Public Service District
- Orchard Dale Water District
- Otay Water District
- Padre Dam Municipal Water District
- Pajaro Valley Water Management Agency
- Palmdale Water District
- Pebble Beach Community Services District
- Pine Cove Water District
- Pinedale County Water District
- Pico Water District
- Placer County Water Agency
- Purissima Hills Water District
- Quartz Hill Water District
- Quincy Community Services District
- Rainbow Municipal Water District
- Ramona Municipal Water District
- Rancho California Water District
- Resource Conservation District of The Santa Monica Mountains
- Rio Alto Water District
- Rio Linda Elverta Community Water District
- Rincon Del Diablo Municipal Water District
- Rosamond Community Services District
- Running Springs Water District
- Rubidoux Community Services District
- Sacramento Suburban Water District
- Salton Community Services District
- San Benito County Water District
- San Dieguito Water District
- San Diego County Water Authority
- San Gabriel County Water District
- San Gabriel Valley Municipal Water District
- San Gorgonio Pass Water Agency
- San Juan Water District
- San Lorenzo Valley Water District
- San Luis Water District
- San Miguel Community Services District
- Santa Ana Watershed Project Authority
- Santa Barbara Regional Health Authority
- Santa Clara Valley Water Agency
- Santa Clara Valley Water District
- Santa Clarita Valley Water Agency
- Santa Fe Irrigation District
- Santa Margarita Water District
- Santa Nella County Water District
- Santa Ynez River Water Conservation District, Improvement District No. 1
- Scotts Valley Water District
- Serrano Water District
- Sierra Lakes County Water District
- Silicon Valley Clean Water
- Solano County Water Agency
- Solano Irrigation District
- South Coast Water District
- South Feather Water And Power Agency
- South Orange County Wastewater Authority
- South Placer Municipal Utility District
- South San Luis Obispo County Sanitation District
- Soquel Creek Water District
- Stallion Springs Community Services District
- State Water Contractors
- State And Federal Contractors Water Agency
- Stege Sanitary District
- Stinson Beach County Water District
- Stockton East Water District
- Sunnyslope County Water District
- Sweetwater Authority
- Sweetwater Springs Water District
- Tahoe-Truckee Sanitation Agency
- Tehachapi-Cummings County Water District
- Templeton Community Services District
- Thermalito Water and Sewer District
- Three Valleys Municipal Water District
- Trabuco Canyon Water District
- Tuolumne Utilities District
- Twentynine Palms Water District
- Union Sanitary District
- United Water Conservation District
- Upper San Gabriel Valley Municipal Water District
- Utica Water And Power Authority
- Vallecitos Water District
- Valley Center Municipal Water District
- Valley County Water District
- Valley of The Moon Water District
- Valley Sanitary District
- Vandenberg Village Community Services District
- Ventura River Water District
- Victor Valley Wastewater Reclamation Authority
- Vista Irrigation District
- Walnut Valley Water District
- Water Facilities Authority
- Water Replenishment District of Southern California
- West Basin Municipal Water District
- West Bay Sanitary District
- West Kern Water District
- West Valley Sanitation District of Santa Clara County
- West Valley Water District
- Westborough Water District
- Western Municipal Water District
- Westlands Water District
- Westwood Community Services District
- Wheeler Ridge-Maricopa Water Storage District
- Willow County Water District
- Winton Water And Sanitary District
- Yorba Linda Water District
- Yuima Municipal Water District
- Yucaipa Valley Water District