California
2,942 Utilities
Serving: 43,763,000
Data available: 2010-2015
Contaminants Found: 174
EWG's drinking water quality report for California shows results of tests conducted by the water utilities in California and provided to EWG by the California State Water Resources Control Board.
Below are utilities in California serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.
Large utilities in California
Utilities that accumulated/accrued the most violation points as of October 2014 to September 2017 in California
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Large utilities that accumulated/accrued the most violation points as of October 2014 to September 2017 in California
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|---|---|---|
| Arvin Community Services District | Arvin, CA | 19,000 | 92 |
| City of Lemoore | Lemoore, CA | 24,945 | 50 |
| City of Avenal | Avenal, CA | 16,236 | 45 |
| Lamont Public Utility District | Bakersfield, CA | 18,290 | 40 |
| Coalinga | Coalinga, CA | 19,362 | 31 |
| City of Lindsay | Lindsay, CA | 13,445 | 25 |
| City of Imperial | Imperial, CA | 16,145 | 15 |
| La Verne WD | La Verne, CA | 32,230 | 10 |
| City of Galt | Galt, CA | 22,982 | 6 |
| Calif State Polytechnical Univ - Pomona | Pomona, CA | 24,880 | 5 |
| City of American Canyon | American Canyon, CA | 20,082 | 5 |
| Camp Pendleton (North) | Camp Pendleton, CA | 15,600 | 5 |
| City of Mendota | Mendota, CA | 11,104 | 5 |
| California Mens Colony | San Luis Obispo, CA | 15,000 | 5 |
| East Valley Water District | Highland, CA | 87,000 | 5 |
| Camp Pendleton (South) | Camp Pendleton, CA | 39,400 | 5 |
| Oildale MWC | Oildale, CA | 26,000 | 5 |
| City of McFarland | Mcfarland, CA | 12,333 | 4 |
| City of Chino | Chino, CA | 18,907 | 3 |
| City of El Centro | El Centro, CA | 42,595 | 2 |
| Beverly Hills Water Department | Beverly Hills, CA | 44,290 | 2 |
| Fillmore Water Department | Fillmore, CA | 15,222 | 2 |
| City of Exeter | Exeter, CA | 10,539 | 1 |
| Yucaipa Valley Water District | Yucaipa, CA | 44,629 | 1 |
| City of Ripon | Ripon, CA | 14,915 | 1 |
| Santa Maria Water Department | Santa Maria, CA | 100,306 | 1 |
| Santa Fe Springs Water Department | Santa Fe Springs, CA | 18,199 | 1 |
| Linda County Water District | Marysville, CA | 13,800 | 1 |
| City of Mountain View | Mountain View, CA | 76,000 | 1 |
| City of Modesto, Salida | Modesto, CA | 24,440 | 1 |
Contaminants found in California above health guidelines
| Found above health guidelines | Found | ||||||
|---|---|---|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Total trihalomethanes (TTHMs) | 1,077 | 39,335,944 | 1,156 | 41,596,023 | |||
Chromium (hexavalent) | 1,325 | 38,245,670 | 1,361 | 39,791,889 | |||
Bromodichloromethane | 838 | 31,459,093 | 901 | 34,396,823 | |||
Dibromochloromethane | 755 | 30,209,936 | 878 | 34,300,083 | |||
Uranium | 916 | 29,923,627 | 965 | 32,504,268 | |||
Chloroform | 660 | 29,338,781 | 823 | 34,103,515 | |||
Dichloroacetic acid | 587 | 26,726,023 | 645 | 30,402,900 | |||
Trichloroacetic acid | 513 | 25,143,958 | 558 | 27,083,977 | |||
Arsenic | 736 | 22,989,537 | 736 | 22,989,537 | |||
Radium-228 | 646 | 17,516,640 | 730 | 19,454,600 | |||
Radium-226 | 213 | 12,083,512 | 260 | 15,466,904 | |||
Bromate | 98 | 10,559,416 | 100 | 10,588,306 | |||
Radon | 111 | 9,537,779 | 111 | 9,537,779 | |||
Bromoform | 285 | 8,383,831 | 801 | 33,091,910 | |||
Chlorate | 102 | 7,790,508 | 560 | 39,972,896 | |||
Tetrachloroethylene (perchloroethylene) | 93 | 4,753,275 | 104 | 9,347,496 | |||
Nitrate | 319 | 4,460,687 | 1,767 | 32,892,329 | |||
1,2-Dibromo-3-chloropropane (DBCP) | 84 | 3,475,117 | 90 | 3,937,057 | |||
1,2,3-Trichloropropane | 74 | 3,155,122 | 86 | 7,781,438 | |||
1,4-Dioxane | 48 | 2,544,059 | 200 | 17,744,976 | |||
Chlorite | 9 | 2,133,002 | 9 | 2,133,002 | |||
Perfluorooctane sulfonate (PFOS) | 20 | 1,998,273 | 20 | 1,998,273 | |||
Strontium-90 | 29 | 1,916,790 | 88 | 4,688,432 | |||
Trichloroethylene | 34 | 1,594,257 | 69 | 8,246,204 | |||
Perfluorooctanoic acid (PFOA) | 22 | 1,557,883 | 22 | 1,557,883 | |||
Manganese | 167 | 1,429,956 | 628 | 14,698,974 | |||
Vanadium | 87 | 1,277,561 | 890 | 39,450,079 | |||
Perchlorate | 27 | 935,971 | 53 | 3,168,412 | |||
N-Nitrosodimethylamine (NDMA) | 11 | 809,042 | 40 | 1,886,519 | |||
Nitrate and nitrite | 8 | 471,605 | 101 | 3,804,108 | |||
Perfluorohexane sulfonate (PFHXS) | 5 | 460,593 | 7 | 641,634 | |||
Perfluoroheptanoic acid (PFHPA) | 5 | 311,368 | 9 | 715,979 | |||
Carbon tetrachloride | 4 | 208,689 | 8 | 320,230 | |||
Benzo[a]pyrene | 10 | 136,463 | 10 | 136,463 | |||
Cadmium | 17 | 82,641 | 50 | 1,365,053 | |||
Ethylene dibromide | 3 | 69,106 | 7 | 621,948 | |||
Aluminum | 10 | 59,819 | 338 | 15,725,306 | |||
Benzene | 3 | 46,360 | 4 | 46,446 | |||
Strontium | 3 | 43,301 | 552 | 38,021,261 | |||
Tritium | 2 | 18,354 | 94 | 4,785,977 | |||
Molybdenum | 3 | 17,527 | 497 | 35,790,683 | |||
Thallium | 3 | 3,283 | 17 | 659,466 | |||
Antimony | 7 | 3,261 | 31 | 1,259,187 | |||
Selenium | 5 | 1,284 | 189 | 4,163,989 | |||
Beryllium | 2 | 1,240 | 22 | 978,260 | |||
Chloromethane | 2 | 705 | 84 | 3,154,847 | |||
Di(2-ethylhexyl) phthalate | 1 | 66 | 1 | 66 | |||
Barium | 1 | 51 | 622 | 20,083,218 | |||
Mercury (inorganic) | 1 | 44 | 31 | 628,062 | |||
1,2-Dichloropropane | 1 | 35 | 5 | 436,459 | |||
Contaminants found in California above legal limits
| Contaminant | # of Utilities | People Served | |
|---|---|---|---|
Total trihalomethanes (TTHMs) | 38 | 109,456 | |
Nitrate | 32 | 84,117 | |
Nitrate and nitrite | 2 | 70,300 | |
Arsenic | 103 | 69,078 | |
Haloacetic acids (HAA5) | 21 | 22,709 | |
Fluoride | 4 | 17,339 | |
1,2-Dibromo-3-chloropropane (DBCP) | 2 | 13,883 | |
Uranium | 36 | 12,992 | |
Tetrachloroethylene (perchloroethylene) | 1 | 7,000 | |
Antimony | 1 | 139 | |
Radium, combined (-226 & -228) | 1 | 120 | |
Selenium | 1 | 75 | |
Nitrite | 1 | 65 |