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EWG's Tap Water Database

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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.

LARGE UTILITIES
ALL UTILITIES WITH VIOLATIONS
LARGE UTILITIES WITH VIOLATIONS

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

UtilityLocationPeople
Served
Alameda County Water DistrictFremont, CA340,000
Alco Water ServiceSalinas, CA29,179
Apple Valley Ranchos Water CompanyApple Valley, CA62,602
Arroyo Grande,Water DepartmentArroyo Grande, CA17,064
Arvin Community Services DistrictArvin, CA19,000
Atascadero Mutual Water CompanyAtascadero, CA30,332
Azusa Light and WaterAzusa, CA110,000
Beaumont Cherry Valley WDBeaumont, CA44,000
Bella Vista Water DistrictRedding, CA18,426
Bellflower - Somerset MWCBellflower, CA46,000
Beverly Hills Water DepartmentBeverly Hills, CA44,290
Big Bear City CSDBig Bear City, CA12,411
Burbank Water DepartmentBurbank, CA105,543
Cal American Water CompanyNewbury Park, CA61,206
Cal-am Water Company - DuarteRosemead, CA21,589
Cal-water Service Company - ChicoChico, CA100,435
Cal-water Service Company - MarysvilleChico, CA12,017
Cal/am Water Company - Baldwin HillsRosemead, CA18,397
Cal/Am Water Company - San MarinoRosemead, CA40,804
Calif State Polytechnical Univ - PomonaPomona, CA24,880
California American Water Company - AntelopeSacramento, CA34,168
California American Water Company - CoronadoImperial Beach, CA96,000
California American Water Company - Lincoln OaksSacramento, CA46,606
California American Water Company - MontereyMonterey, CA96,754
California American Water Company - ParkwaySacramento, CA44,949
California American Water Company - SuburbanSacramento, CA111,768
California Institution For MenChino, CA10,667
California Mens ColonySan Luis Obispo, CA15,000
California State FairSacramento, CA90,000
California State University FresnoFresno, CA23,000
More

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.

UtilityLocationPeople
Served
Violation
Points
Hillview Water Co-raymondOakhurst, CA294350
Sonoma County Mutual Water CompanyCazadero, CA40270
Son Shine PropertiesEdison, CA438235
Quiet Oaks Mobile Home ParkWarner Springs, CA120225
East Wilson Road Water CompanyBakersfield, CA35194
Wilson Road Water CommunityBakersfield, CA72191
Hillview Water Company-oakhurst/sierra LakesOakhurst, CA2,805190
Forest SpringsBoulder Creek, CA385186
Springfield Water CompanyWatsonville, CA200185
San Joaquin Estates Mutual Water CompanyBakersfield, CA165184
San Miguel Ws #01Royal Oaks, CA100181
Las Cumbres Mutual Water CompanyLos Gatos, CA337180
Rainbird Valley Mutual Water CompanyWeldon, CA188175
Ironwood CampNewberry Springs, CA1,000175
Apple Ave. Ws #03Greenfield, CA60171
Encinal Rd. Ws #01Salinas, CA41165
Valley Ford Water AssociationValley Ford, CA40151
R.s. Mutual Water CompanyWofford Heights, CA67148
El Camino Water Company Inc.Spreckels, CA90142
Rodriguez Labor CampDelano, CA110141
Csa 70 W-4 PioneertownVictorville, CA625140
Lemon Cove Water CompanyLemon Cove, CA200140
Beverly Grand Mutual WaterArroyo Grande, CA108140
Ramona Water CompanyAnza, CA250135
Soults Mutual Water CompanyTulare, CA120128
River Rd. Ws #25Gonzales, CA65125
Vista Del Toro WsSalinas, CA87121
Sierra Mutual Water CompanyPorterville, CA39116
Willowside Terrace Water AssociationAlpine, CA100111
Lakeview Ranchos Mutual Water CompanyWeldon, CA120105

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.

UtilityLocationPeople
Served
Violation
Points
Arvin Community Services DistrictArvin, CA19,00092
City of LemooreLemoore, CA24,94550
City of AvenalAvenal, CA16,23645
Lamont Public Utility DistrictBakersfield, CA18,29040
CoalingaCoalinga, CA19,36231
City of LindsayLindsay, CA13,44525
City of ImperialImperial, CA16,14515
La Verne WDLa Verne, CA32,23010
City of GaltGalt, CA22,9826
Calif State Polytechnical Univ - PomonaPomona, CA24,8805
City of American CanyonAmerican Canyon, CA20,0825
Camp Pendleton (North)Camp Pendleton, CA15,6005
City of MendotaMendota, CA11,1045
California Mens ColonySan Luis Obispo, CA15,0005
East Valley Water DistrictHighland, CA87,0005
Camp Pendleton (South)Camp Pendleton, CA39,4005
Oildale MWCOildale, CA26,0005
City of McFarlandMcfarland, CA12,3334
City of ChinoChino, CA18,9073
City of El CentroEl Centro, CA42,5952
Beverly Hills Water DepartmentBeverly Hills, CA44,2902
Fillmore Water DepartmentFillmore, CA15,2222
City of ExeterExeter, CA10,5391
Yucaipa Valley Water DistrictYucaipa, CA44,6291
Santa Maria Water DepartmentSanta Maria, CA100,3061
City of RiponRipon, CA14,9151
Santa Fe Springs Water DepartmentSanta Fe Springs, CA18,1991
City of Modesto, SalidaModesto, CA24,4401
Linda County Water DistrictMarysville, CA13,8001
City of Mountain ViewMountain View, CA76,0001

Contaminants found in California above health guidelines

Found above health guidelinesFound
Contaminant# of UtilitiesPeople Served# of UtilitiesPeople Served

Total trihalomethanes (TTHMs)
1,07739,335,9441,15641,596,023

Chromium (hexavalent)
1,32538,245,6701,36139,791,889

Bromodichloromethane
83831,459,09390134,396,823

Dibromochloromethane
75530,209,93687834,300,083

Uranium
91629,923,62796532,504,268

Chloroform
66029,338,78182334,103,515

Dichloroacetic acid
58726,726,02364530,402,900

Trichloroacetic acid
51325,143,95855827,083,977

Arsenic
73622,989,53773622,989,537

Radium-228
64617,516,64073019,454,600

Radium-226
21312,083,51226015,466,904

Bromate
9810,559,41610010,588,306

Radon
1119,537,7791119,537,779

Bromoform
2858,383,83180133,091,910

Chlorate
1027,790,50856039,972,896

Tetrachloroethylene (perchloroethylene)
934,753,2751049,347,496

Nitrate
3194,460,6871,76732,892,329

1,2-Dibromo-3-chloropropane (DBCP)
843,475,117903,937,057

1,2,3-Trichloropropane
743,155,122867,781,438

1,4-Dioxane
482,544,05920017,744,976

Chlorite
92,133,00292,133,002

Perfluorooctane sulfonate (PFOS)
201,998,273201,998,273

Strontium-90
291,916,790884,688,432

Trichloroethylene
341,594,257698,246,204

Perfluorooctanoic acid (PFOA)
221,557,883221,557,883

Manganese
1671,429,95662814,698,974

Vanadium
871,277,56189039,450,079

Perchlorate
27935,971533,168,412

N-Nitrosodimethylamine (NDMA)
11809,042401,886,519

Nitrate and nitrite
8471,6051013,804,108

Perfluorohexane sulfonate (PFHXS)
5460,5937641,634

Perfluoroheptanoic acid (PFHPA)
5311,3689715,979

Carbon tetrachloride
4208,6898320,230

Benzo[a]pyrene
10136,46310136,463

Cadmium
1782,641501,365,053

Ethylene dibromide
369,1067621,948

Aluminum
1059,81933815,725,306

Benzene
346,360446,446

Strontium
343,30155238,021,261

Tritium
218,354944,785,977

Molybdenum
317,52749735,790,683

Thallium
33,28317659,466

Antimony
73,261311,259,187

Selenium
51,2841894,163,989

Beryllium
21,24022978,260

Chloromethane
2705843,154,847

Di(2-ethylhexyl) phthalate
166166

Barium
15162220,083,218

Mercury (inorganic)
14431628,062

1,2-Dichloropropane
1355436,459

Contaminants found in California above legal limits