California utilities 801 to 900.
Each serves 1,076 to 1,616 people, as it reports to EPA. Your ZIP code finds yours faster.
801 to 900 of 2,762, by people served
| Utility | Based in | Serves | Regulated PFAS | Health-based violations since 2016 |
|---|---|---|---|---|
| Liberty Utilities - Mesa Crest | Downey | 1,616 | Not sampled | 0 |
| Callayomi County Water District | Middletown | 1,607 | Not sampled | 1 |
| San Miguelito MWC | Avila Beach | 1,600 | Not sampled | 2 |
| Durham Irrigation District | Durham | 1,581 | Not sampled | 0 |
| Cal - Water Service Co. - Hamilton City | Hamilton City | 1,575 | Not sampled | 0 |
| Devore WC | Devore | 1,574 | Not sampled | 2 |
| Oid - Oakdale Rural Water System #1 | Oakdale | 1,570 | Not sampled | 0 |
| Lynwood Park Mutual Water Co. | Compton | 1,564 | Not sampled | 2 |
| Madera Co Sa1 - Indian Lakes | Madera | 1,562 | Not sampled | 0 |
| Pine Cove Water District | Idyllwild | 1,540 | Not sampled | 0 |
| Fall River Valley CSD | Fall River Mills | 1,535 | Not sampled | 0 |
| Los Alamos Community Services District | Los Alamos | 1,534 | Not sampled | 0 |
| Lake County CSA 2 - Spring Valley | Lakeport | 1,531 | Not sampled | 0 |
| Cal Am Water Company - Hidden Hills | Pacific Grove | 1,521 | Not sampled | 0 |
| Hume Lake Christian Camps, Inc | Hume | 1,519 | Not sampled | 0 |
| White Fence Farms MWC No. 1 | Palmdale | 1,518 | Not sampled | 2 |
| Buckingham Park Water District | Kelseyville | 1,502 | Not sampled | 0 |
| Mariana Ranchos CWD | Apple Valley | 1,502 | Not sampled | 0 |
| California State University Fresno | Fresno | 1,500 | PFOA, PFBS | 0 |
| Sonoma State University | Rohnert Park | 1,500 | None found | 1 |
| Springville PUD | Springville | 1,500 | Not sampled | 1 |
| Golden State Water Company - Edna | Santa Maria | 1,495 | Not sampled | 0 |
| Del Rey Community Serv Dist | Del Rey | 1,491 | Not sampled | 0 |
| Midway Heights C. W. D. | Meadow Vista | 1,491 | Not sampled | 0 |
| West Almanor M.W.C. | Chester | 1,464 | Not sampled | 0 |
| Guadalupe Valley Mid | Brisbane | 1,455 | PFOA, PFOS, PFHxS | 0 |
| Suburban Water Systems - Covina Knolls | Covina | 1,451 | Not sampled | 0 |
| Los Molinos Comm. Services Dist. | Los Molinos | 1,450 | Not sampled | 12 |
| Inverness Public Utility Dist | Inverness | 1,445 | Not sampled | 0 |
| Cal Am Water Company - Toro | Pacific Grove | 1,442 | Not sampled | 0 |
| Ventura Cwwd No. 19 - Somis | Moorpark | 1,429 | Not sampled | 0 |
| Biola Community Services Dist | Biola | 1,427 | Not sampled | 0 |
| Tahoe Keys Water Company | South Lake Tahoe | 1,420 | Not sampled | 1 |
| California Water Service Co. - Lancaster | San Jose | 1,416 | None found | 0 |
| High Desert Detention Center | Adelanto | 1,400 | Not sampled | 0 |
| Arrowbear Park CWD | Arrowbear Lake | 1,396 | Not sampled | 0 |
| Hydesville Co. W.D. | Hydesville | 1,389 | Not sampled | 1 |
| Tahoe City PUD - Rubicon | Tahoe City | 1,384 | Not sampled | 0 |
| Lebec County Water District | Lebec | 1,379 | Not sampled | 28 |
| Cal Am Water Company - Ambler Park | Pacific Grove | 1,370 | Not sampled | 0 |
| City of Modesto - del Rio | Modesto | 1,346 | Not sampled | 0 |
| Buttonwillow CWD | Buttonwillow | 1,337 | Not sampled | 0 |
| Garden Acres Mutual Water Co | Oxnard | 1,335 | Not sampled | 0 |
| Lower Lake County Water District | Lower Lake | 1,326 | Not sampled | 1 |
| McCloud C.S.D. | McCloud | 1,317 | Not sampled | 3 |
| Rural North Vacaville Water District | Vacaville | 1,313 | Not sampled | 0 |
| Mission Springs Conference Center | Scotts Valley | 1,310 | Not sampled | 0 |
| Midway City Mutual WC | Midway City | 1,305 | Not sampled | 0 |
| Jackson Valley Irrigation District | Ione | 1,303 | None found | 0 |
| Slo Cwwd No. 23 - Santa Margarita | San Luis Obispo | 1,291 | Not sampled | 0 |
| California Village | Needles | 1,290 | None found | 0 |
| Sea Ranch Water Company,the (Puc) | Sea Ranch | 1,287 | PFHxS | 1 |
| Del Oro River Island Serv Terr #1 | Chico | 1,277 | Not sampled | 41 |
| Stratford PUD | Hanford | 1,277 | Not sampled | 0 |
| Green Valley CWD | Green Valley | 1,275 | Not sampled | 1 |
| Dwp - Fawnskin | Big Bear Lake | 1,271 | Not sampled | 0 |
| City of Montague | Montague | 1,264 | Not sampled | 2 |
| Highland Mobile Home Park | Bishop | 1,260 | Not sampled | 1 |
| Tahoe City PUD - McKinney/Quail | Tahoe City | 1,245 | Not sampled | 0 |
| Howell Mountain Mutual Water Company | Angwin | 1,244 | Not sampled | 4 |
| Kettleman City CSD | Kettleman City | 1,242 | Not sampled | 22 |
| Sbdno County Service Area 70 Cedar Glen | San Bernardino | 1,240 | Not sampled | 0 |
| Gateway | El Centro | 1,215 | Not sampled | 2 |
| Redway C.S.D. | Redway | 1,207 | Not sampled | 0 |
| Gerber Las Flores CSD | Gerber | 1,200 | Not sampled | 0 |
| Malaga County Water District | Fresno | 1,200 | None found | 1 |
| Nasa Ames Research Center | Moffett Field | 1,200 | None found | 0 |
| Slocsa #10a - Cayucos | San Luis Obispo | 1,200 | Not sampled | 0 |
| Vineyard Ave Estates MWC | Oxnard | 1,200 | Not sampled | 1 |
| MT. Hermon Association, Inc. | Mount Hermon | 1,176 | Not sampled | 1 |
| Maxwell Public Utility District | Maxwell | 1,175 | Not sampled | 0 |
| City of Blue Lake | Blue Lake | 1,172 | None found | 0 |
| Fairoaks PWS #44 | Stockton | 1,172 | Not sampled | 0 |
| Camp Meeker Water System | Camp Meeker | 1,171 | Not sampled | 0 |
| Phoenix Lake Estates Cc MWC | Standard | 1,168 | Not sampled | 0 |
| Olympic Valley PSD | Olympic Valley | 1,165 | Not sampled | 0 |
| Sundale Mutual Water Company A, B | Lancaster | 1,155 | Not sampled | 0 |
| Laytonville County Water District | Laytonville | 1,152 | Not sampled | 0 |
| Laton Community Services District | Laton | 1,151 | PFOA, PFOS, PFBS | 1 |
| Bellflower Home Garden Water Company | Bellflower | 1,129 | Not sampled | 0 |
| Inyokern CSD | Inyokern | 1,125 | Not sampled | 1 |
| Sonora Meadows Mutual WTR Co | Sonora | 1,123 | Not sampled | 1 |
| Big Basin Water Company | Irvine | 1,120 | Not sampled | 0 |
| Bdvwa - Goat Mountain ID | Yucca Valley | 1,118 | Not sampled | 0 |
| Sonoma County CSA 41 - Fitch Mountain | Santa Rosa | 1,115 | Not sampled | 0 |
| Wild Wings Golf Community | Woodland | 1,115 | Not sampled | 0 |
| City of Modesto - South Turlock | Modesto | 1,109 | Not sampled | 0 |
| Fcsa 34 - Millerton New Town | Fresno | 1,109 | Not sampled | 17 |
| Inyo County PWD - Independence | Independence | 1,108 | Not sampled | 2 |
| Bakman Water - Rolling Hills | Fresno | 1,107 | None found | 2 |
| North Edwards WD | North Edwards | 1,105 | Not sampled | 30 |
| Atascadero State Hospital | Atascadero | 1,100 | PFOS, PFHxS, PFBS | 0 |
| Happy Camp C.S.D. | Happy Camp | 1,100 | Not sampled | 1 |
| Knights Landing Svc. Dist. | Woodland | 1,099 | Not sampled | 1 |
| Grizzly Flats Community Servic | Grizzly Flats | 1,093 | Not sampled | 0 |
| San Joaquin County - Raymus Village | Stockton | 1,086 | Not sampled | 9 |
| Slo CSA No. 16 - Shandon | San Luis Obispo | 1,085 | Not sampled | 0 |
| Cal Am - West San Martin | Pacific Grove | 1,079 | Not sampled | 1 |
| Waterford - River Pointe | Waterford | 1,079 | Not sampled | 0 |
| Hopland Public Utility District | Ukiah | 1,076 | Not sampled | 0 |
Every utility EPA sampled for PFAS under UCMR 5, any other community system serving 3,300 people or more, and any smaller one with results from 2020 on, from the state. Other systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q3, UCMR 5 and EPA’s 2012 to 2019 compliance results, and California State Water Resources Control Board, Division of Drinking Water.
Where to go next
- Read your utility’s own reportIt covers contaminants these pages don’t show, and its own latest results.How to read it
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