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 |
| Mattole Elementary School | Petrolia, CA | 50 | 33 | - |
| Bridgeville Elem. School | Bridgeville, CA | 50 | 16 | - |
| Gordon's Well #1 | Winterhaven, CA | 50 | 16 | - |
| Gordon's Well Park # 2 | Winterhaven, CA | 50 | 12 | - |
| Brandt Cattle | Calipatria, CA | 50 | 8 | - |
| Tecopa Hot Springs Park | Independence, CA | 50 | 19 | - |
| Tecopa Palms Therapeutic Hot Springs Res | Tecopa, CA | 50 | 9 | - |
| Taboose Creek Campground | Independence, CA | 50 | 19 | - |
| Big Trees Campground | Bishop, CA | 50 | 1 | - |
| Sage Flat Campground | Bishop, CA | 50 | 1 | - |
| Rock Creek Lake Boat Dock & Group Camp | Bishop, CA | 50 | 1 | - |
| Round Mountain Water Company | Bakersfield, CA | 50 | 142 | - |
| Sierra Vista Restaurant | Weldon, CA | 50 | 97 | - |
| Gosford Road Water Company | Bakersfield, CA | 50 | 50 | - |
| M & L Cold Storage Water System | Delano, CA | 50 | 5 | - |
| Agape Mutual Water System | Bakersfield, CA | 50 | 12 | - |
| Jakov Dulcich & Sons Water System | McFarland, CA | 50 | 8 | - |
| Roberts Investments Water System | Mojave, CA | 50 | 4 | - |
| 15th Avenue | Stockton, CA | 50 | 7 | - |
| Netto Ag Inc. | Hanford, CA | 50 | 18 | - |
| Wildwood | Lakeport, CA | 50 | 11 | - |
| Twin Creeks Mobile and RV Village | Irvine, CA | 50 | 45 | - |
| Agua Dulce Women's Club | Agua Dulce, CA | 50 | 4 | - |
| Usfs-Chilao Main A-9 | Arcadia, CA | 50 | 35 | - |
| Henninger Flats | Los Angeles, CA | 50 | 1 | - |
| Usfs-Sycamore Flats V-5 | Arcadia, CA | 50 | 3 | - |
| Acton Four Square Church | Acton, CA | 50 | 20 | - |
| Living Springs Church | Agua Dulce, CA | 50 | 6 | - |
| Bass Fork Star | North Fork, CA | 50 | 46 | - |
| SC Corner (Water Only) | Madera, CA | 50 | 40 | - |
| Marquez Rental | Firebaugh, CA | 50 | 81 | - |
| Bonita Five Inc. | Madera, CA | 50 | 88 | - |
| Paradise Springs | Oakhurst, CA | 50 | 11 | - |
| Audubon Canyon Ranch - Mgp Picher | Stinson Beach, CA | 50 | 27 | - |
| Audubon Canyon Ranch - Mgp Volunteer | Stinson Beach, CA | 50 | 27 | - |
| Marshall Boat Works | Marshall, CA | 50 | 0 | - |
| Tomales Church of the Assumption | Tomales, CA | 50 | 0 | - |
| Maif - Marshall Aqua Improvement Forum | Marshall, CA | 50 | 0 | - |
| McPr-Midpines Park | Mariposa, CA | 50 | 2 | - |
| McPr - Darrah School Park | Mariposa, CA | 50 | 2 | - |
| Tavis Corporation | Mariposa, CA | 50 | 12 | - |
| Heritage House | Redding, CA | 50 | 27 | - |
| Seafair Road and Water Company | Mendocino, CA | 50 | 8 | - |
| The Land | Philo, CA | 50 | 4 | - |
| Montessori del Mar Learning Center | Fort Bragg, CA | 50 | 7 | - |
| Cortez Growers Asso. Water System | Turlock, CA | 50 | 0 | - |
| Mdf-Adin Ranger Station | Alturas, CA | 50 | 15 | - |
| Mendocino Hotel | Mendocino, CA | 50 | 5 | - |
| Holly Ranch Village | Fort Bragg, CA | 50 | 23 | - |
| Pine Glade Association | La Canada, CA | 50 | 27 | - |