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 |
|---|---|---|---|---|
| Los Angeles-City, Dept. of Water & Power | Los Angeles, CA | 3,875,566 | 33 | Clean |
| East Bay MUD | Oakland, CA | 1,442,800 | 14 | Detected |
| San Diego, City Of | San Diego, CA | 1,385,379 | 33 | Clean |
| San Jose Water | San Jose, CA | 1,039,920 | 14 | Detected |
| Sfpuc City Distribution Division | Burlingame, CA | 848,019 | 0 | Clean |
| Eastern Municipal WD | Perris, CA | 666,581 | 6 | Clean |
| City of Fresno | Fresno, CA | 545,716 | 33 | Detected |
| City of Sacramento Main | Sacramento, CA | 520,407 | 4 | Detected |
| Long Beach Utilities Department | Long Beach, CA | 466,772 | 6 | Clean |
| Irvine Ranch Water District | Irvine, CA | 444,800 | 12 | Detected |
| City of Anaheim | Anaheim, CA | 348,593 | 5 | Detected |
| Alameda County Water District | Fremont, CA | 344,000 | 9 | Clean |
| City of Santa Ana | Santa Ana, CA | 310,539 | 20 | Detected |
| Riverside, City Of | Riverside, CA | 298,398 | 1 | Detected |
| Santa Clarita Valley Water Agency | Newhall, CA | 294,090 | 4 | Detected |
| Gswc - Southwest | Hawthorne, CA | 277,740 | 11 | Clean |
| Helix Water District | La Mesa, CA | 277,668 | 0 | Clean |
| Coachella Vwd: Cove Community | Palm Desert, CA | 270,000 | 3 | Clean |
| Cws - Bakersfield | San Jose, CA | 267,881 | 12 | Detected |
| San Gabriel Valley Water Co.-El Monte | El Monte, CA | 248,000 | 13 | Detected |
| Otay Water District | Spring Valley, CA | 238,008 | 0 | Clean |
| San Gabriel Valley WC - Fontana | Fontana, CA | 237,700 | 3 | Clean |
| Modesto, City Of | Modesto, CA | 218,771 | 25 | Detected |
| San Bernardino City | San Bernardino, CA | 214,665 | 2 | Detected |
| Cucamonga Valley Water District | Rancho Cucamonga, CA | 211,069 | 5 | Clean |
| Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | Alhambra, CA | 208,129 | 11 | Clean |
| City of Huntington Beach | Huntington Beach, CA | 201,000 | 9 | Detected |
| Oxnard Water Dept | Oxnard, CA | 200,232 | 14 | Clean |
| Contra Costa Water District | Concord, CA | 198,000 | 4 | Clean |
| Sacramento Suburban Water District | Sacramento, CA | 194,444 | 23 | Detected |
| City of Stockton | Stockton, CA | 191,302 | 24 | Detected |
| Sweetwater Authority | Chula Vista, CA | 191,282 | 15 | Detected |
| Glendale-City, Water Dept. | Glendale, CA | 188,784 | 2 | Detected |
| Marin Municipal Water District | Corte Madera, CA | 186,895 | 1 | Clean |
| Ontario Municipal Utilities Company | Ontario, CA | 185,010 | 9 | Detected |
| Scwa - Laguna/Vineyard | Sacramento, CA | 184,896 | 2 | Detected |
| San Francisco International Airport | San Francisco, CA | 183,386 | 11 | Clean |
| California Water Service - Stockton | San Jose, CA | 176,266 | 2 | Detected |
| Santa Rosa, City Of | Santa Rosa, CA | 175,396 | 4 | Clean |
| City of Garden Grove | Garden Grove, CA | 174,226 | 0 | Detected |
| Oceanside, City Of | Oceanside, CA | 171,483 | 12 | Clean |
| Moulton Niguel Water District | Laguna Hills, CA | 170,236 | 0 | Clean |
| Elsinore Valley MWD | Lake Elsinore, CA | 169,455 | 22 | Detected |
| Suburban Water Systems-San Jose | Covina, CA | 168,843 | 10 | Detected |
| Corona, City Of | Corona, CA | 168,575 | 36 | Detected |
| Santa Margarita Water District | Rancho Santa Margarita, CA | 168,289 | 2 | Clean |
| Pasadena Water and Power | Pasadena, CA | 164,344 | 8 | Clean |
| City of Hayward | Hayward, CA | 162,954 | 6 | Clean |
| Bakersfield, City Of | San Jose, CA | 160,144 | 9 | Detected |
| City of Sunnyvale | Sunnyvale, CA | 157,566 | 145 | Clean |
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