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 |
|---|---|---|---|---|
| Las Flores Water Co. | Altadena, CA | 4,847 | 14 | Clean |
| Blue Lake Springs Mut Wtr | Arnold, CA | 4,841 | 6 | Clean |
| Los Angeles Cwwd 37-Acton | Alhambra, CA | 4,805 | 0 | Clean |
| Calipatria State Prison | Imperial, CA | 4,800 | 10 | Clean |
| Union Public Utility District | Murphys, CA | 4,774 | 37 | Clean |
| Lakeport, City Of | Lakeport, CA | 4,762 | 9 | Clean |
| Mojave PUD | Mojave, CA | 4,699 | 83 | Clean |
| Cal Trans - Gaviota Rsr | San Luis Obispo, CA | 4,690 | 6 | - |
| Golden State Water Co.-Clearlake System | Rancho Cordova, CA | 4,644 | 2 | Clean |
| Valley View Mutual Water Co. | Baldwin Park, CA | 4,613 | 5 | Clean |
| Coachella Vwd: I.D. No. 8 | Palm Desert, CA | 4,600 | 1 | Clean |
| Ivanhoe Public Utility Dist | Ivanhoe, CA | 4,580 | 22 | Clean |
| Channel Islands Beach Csd | Oxnard, CA | 4,560 | 0 | Clean |
| Cal Am - Bass Lake | Sacramento, CA | 4,527 | 8 | Detected |
| Golden State Water Company - Nipomo | Rancho Cordova, CA | 4,506 | 0 | Detected |
| Peppery Bar and Grill, The | Sonora, CA | 4,500 | 4 | - |
| Northstar Csd - Martis Valley | Truckee, CA | 4,493 | 0 | - |
| Palomar Observatory | Palomar Mountain, CA | 4,416 | 21 | - |
| Department of Transportation | Stockton, CA | 4,375 | 17 | - |
| Suburban Water Systems - Sativa | Covina, CA | 4,363 | 34 | Clean |
| Mt. Konocti Mutual Water Company | Kelseyville, CA | 4,360 | 14 | Clean |
| Slvwd - Felton Water System | Boulder Creek, CA | 4,340 | 19 | Clean |
| California Rehabilitation Center - Norco | Norco, CA | 4,300 | 69 | Detected |
| Correctional Training Facility - Soledad | Soledad, CA | 4,269 | 32 | Clean |
| Commerce-City, Water Dept. | San Jose, CA | 4,205 | 1 | Detected |
| Meiners Oaks Cwd | Ojai, CA | 4,200 | 23 | Clean |
| Cal Am - Arden | Sacramento, CA | 4,191 | 2 | Detected |
| Meadow Vista Cwd | Meadow Vista, CA | 4,183 | 0 | Clean |
| Golden State Water Co - Wrightwood | Apple Valley, CA | 4,177 | 4 | Detected |
| Planada Csd | Planada, CA | 4,164 | 14 | Detected |
| Centerville C.s.d. | Redding, CA | 4,151 | 8 | Clean |
| Russian River County Water District | Forestville, CA | 4,150 | 13 | Clean |
| Armona Community Services Dist | Armona, CA | 4,143 | 292 | Clean |
| City of Wheatland | Wheatland, CA | 4,124 | 9 | Detected |
| Kelseyville Co Waterworks District 3 | Lakeport, CA | 4,102 | 0 | Clean |
| Centinela State Prison | Imperial, CA | 4,100 | 57 | Clean |
| Atascadero State Hospital | Atascadero, CA | 4,100 | 6 | Detected |
| Chuckawalla Valley State Prison | Blythe, CA | 4,090 | 24 | Clean |
| San Joaquin, City Of | San Joaquin, CA | 4,060 | 39 | Clean |
| Lake County CSA 21 - North Lakeport | Lakeport, CA | 4,046 | 5 | - |
| Farm Mutual W.C. (The) | Wildomar, CA | 4,026 | 30 | Detected |
| Camp Far West Resort | Trowbridge, CA | 4,012 | 24 | - |
| Sheep Creek Water Company | Phelan, CA | 4,002 | 5 | Detected |
| Yosemite Nps-Glacier Point | Yosemite Np, CA | 4,000 | 5 | - |
| Mataguay Scout Reservation | San Diego, CA | 4,000 | 35 | - |
| Weaverville C.s.d. | Weaverville, CA | 3,975 | 6 | Detected |
| Warner Springs Ranch Resort LLC | San Diego, CA | 3,972 | 40 | - |
| Joint Regional Water Supply System | Laguna Beach, CA | 3,947 | 0 | - |
| Del Mar, City Of | Del Mar, CA | 3,919 | 10 | Clean |
| Bighorn - Desert View Water Agency | Yucca Valley, CA | 3,916 | 15 | - |