PlainWater

Public Water Systems

7,249 active public water systems in CA, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.

System Name Location Population Violations PFAS
Providence Mtns Sra Hesperia, CA 3,203 2 -
Rancho los Amigos Hospital Alhambra, CA 3,200 4 Detected
Blm-Briceburg Water System Midpines, CA 3,196 8 -
Valley State Prison Chowchilla, CA 3,173 68 -
Madera Co Md10a-Madera Ranchos Madera, CA 3,172 12 -
Cwsc Oak Hills San Jose, CA 3,161 9 Clean
Burney Water District Burney, CA 3,154 43 -
Placer Cwa - Colfax Auburn, CA 3,149 0 -
City of Nevada City Nevada City, CA 3,148 5 -
Amarillo Mutual Water Company Rosemead, CA 3,134 42 -
San Antonio Water Company Upland, CA 3,111 7 Clean
Home Gardens County WD Corona, CA 3,095 176 -
Shasta C.s.d. Shasta, CA 3,069 0 -
Marygold MWC Bloomington, CA 3,055 5 -
Littlerock Creek Irrigation Dist. Littlerock, CA 3,040 12 Clean
High Desert Detention Center Adelanto, CA 3,035 0 -
Petite Pantry Bishop, CA 3,012 35 -
Wild Water Adventures Clovis, CA 3,000 19 -
Caltrans-Boron Rest Stop Water System Bishop, CA 3,000 30 -
Knott S Berry Farm Buena Park, CA 3,000 10 -
El Camino Hospital Mountain View, CA 3,000 5 -
Santa Clara Valley Medical Center San Jose, CA 3,000 21 -
Sweetwater Springs Cwd - Monte Rio Guerneville, CA 3,000 0 -
Casillas Water System Porterville, CA 3,000 2 -
Smith Forks Water System Lancaster, CA 3,000 2 -
Cci - Tehachapi Tehachapi, CA 2,993 22 Clean
Green Valley MWC Green Valley Lake, CA 2,993 15 -
Aromas Water District Aromas, CA 2,988 7 -
Naval Medical Center San Diego CA 2,981 0 -
Heritage Ranch Csd Paso Robles, CA 2,956 38 Clean
Nps-Grant Grove Three Rivers, CA 2,950 9 -
Nps-Wolverton Three Rivers, CA 2,940 278 -
Salinas Valley State Prison Soledad, CA 2,930 8 Clean
Nps-Ash Mountain Three Rivers, CA 2,930 7 -
Nice Mutual Water Company Nice, CA 2,929 6 -
Northgate 880 [Sws] Sacramento, CA 2,926 2 -
Sutter Community S.D. Sutter, CA 2,904 13 -
Nps-Sheep Creek Three Rivers, CA 2,900 10 -
Palo Alto Park Mutual Water Company East Palo Alto, CA 2,900 9 -
Nps-Pinewood Water System Three Rivers, CA 2,900 2 -
June Lake PUD - Down Canyon June Lake, CA 2,810 29 -
Lerdo Sheriff S Facility Bakersfield, CA 2,800 35 -
Land Projects Mutual Water Co. Lancaster, CA 2,800 426 -
Seaside Municipal Water System Seaside, CA 2,800 15 -
Rio Cosumnes Correctional Center [Sws] Sacramento, CA 2,800 10 -
City of Vallejo-Lakes System Vallejo, CA 2,800 6 Clean
Lake Shastina C.s.d Weed, CA 2,790 14 -
O'Connor Tract Co-Operative Water Co. Palo Alto, CA 2,789 12 -
Town of Yountville Yountville, CA 2,787 8 Clean
Arbuckle Public Utility District Arbuckle, CA 2,778 12 -
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