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 | - |