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EWG's Tap Water Database — 2021 UPDATE

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California

  • 2,913 Utilities

  • Serving: 39,025,000

  • Data available: 2014-2019

  • Contaminants Found: 152

 

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 State FairSacramento, CA90,000
California State University FresnoFresno, CA23,000
California Water Service (CWS) - BakersfieldSan Jose, CA246,371
California Water Service (CWS) - King CitySan Jose, CA14,441
More

Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 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
Sonoma County Mutual Water CompanyCazadero, CA40410
R.s. Mutual Water CompanyWofford Heights, CA67285
Rainbird Valley Mutual Water CompanyWeldon, CA188250
Sierra Vista AssociationDelano, CA44201
Gleanings For The HungrySultana, CA31200
Rodriguez Labor CampDelano, CA110200
Knoll EnterprisesLudlow, CA500190
Lemon Cove Water CompanyLemon Cove, CA200190
East Wilson Road Water CompanyBakersfield, CA35180
Apple Ave. Ws #03Greenfield, CA60180
El Camino Water Company Inc.Spreckels, CA90180
Sierra Mutual Water CompanyPorterville, CA39175
Quiet Oaks Mobile Home ParkWarner Springs, CA120170
Son Shine PropertiesEdison, CA438170
River Rd. Ws #25Gonzales, CA65170
San Joaquin Estates Mutual Water CompanyBakersfield, CA165162
San Miguel Ws #01Royal Oaks, CA100160
Encinal Rd. Ws #01Salinas, CA41160
Springfield Water CompanyWatsonville, CA200160
Triple R Mutual Water CompanySpringville, CA400150
Brock Mutual Water CompanyBakersfield, CA511141
Del Oro Grandview Gardens DistrictChico, CA389130
Hillcrest Mobile EstatesYucaipa, CA900130
Ramona Water CompanyAnza, CA250130
East Orosi Community Services DistrictOrosi, CA700127
Wilson Road Water CommunityBakersfield, CA72122
North Davis MeadowsWoodland, CA314120
Valley Ford Water AssociationValley Ford, CA40115
Lakeview Ranchos Mutual Water CompanyWeldon, CA120105
Saint Anthony Trailer ParkMecca, CA300100

Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 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
City of LindsayLindsay, CA13,44590
City of LemooreLemoore, CA24,94585
Arvin Community Services DistrictArvin, CA19,00065
Linda County Water DistrictMarysville, CA13,8007
CCWD Ebbetts Pass Improvement DistrictSan Andreas, CA14,3405
City of LivingstonLivingston, CA14,8945
City of SonomaSonoma, CA10,8072
City of LathropLathrop, CA12,4271
City of Red BluffRed Bluff, CA14,0251
Walnut Park Mutual Water CompanyHuntington Park, CA16,1801
City of American CanyonAmerican Canyon, CA20,0821
Orchard Dale Water DistrictWhittier, CA22,4921
City of San Juan CapistranoSan Juan Capistrano, CA40,0001
Bellflower - Somerset MWCBellflower, CA46,0001

Contaminants found in California above health guidelines

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

Total trihalomethanes (TTHMs)		1,42637,886,9241,43038,029,122

Chromium (hexavalent)		1,34835,806,0691,38637,522,992

Haloacetic acids (HAA5)		1,19635,521,9751,20436,035,375

Haloacetic acids (HAA9)		45034,528,34250636,327,029

Bromodichloromethane		1,20731,894,6811,22732,670,650

Dibromochloromethane		1,19431,276,3271,22932,463,548

Dibromoacetic acid		98529,582,83899730,608,367

Dichloroacetic acid		90729,324,03795830,848,967

Chloroform		99829,315,6381,15532,799,147

Nitrate		1,81429,057,9821,96533,218,925

Nitrate and nitrite		1,08428,559,1341,13230,884,469

Trichloroacetic acid		83528,356,83786629,659,189

Uranium		90226,856,68993327,994,597

Bromoform		89725,703,7501,10031,125,206

Arsenic		1,27525,199,0481,27425,196,548

Bromate		16818,983,06816318,982,044

Bromochloroacetic acid		19211,635,28419211,635,284

Radium, combined (-226 & -228)		49010,723,27551911,499,750

Strontium-90		1099,100,59514210,315,654

Perfluorooctanoic acid (PFOA)		1098,030,1911098,030,191

Perfluorooctane sulfonate (PFOS)		845,484,4891218,175,377

Tetrachloroethylene (perchloroethylene)		1024,873,9631206,413,139

Perfluorohexane sulfonate (PFHXS)		754,668,0771178,291,791

Chlorate		874,392,49552936,282,036

1,2,3-Trichloropropane		1543,029,8011905,440,006

1,2-Dibromo-3-chloropropane (DBCP)		932,979,2711183,811,101

1,4-Dioxane		462,569,14819117,726,312

Perfluorobutane sulfonate (PFBS)		482,439,452946,692,114

Radon		642,270,441642,270,441

Chlorite		111,975,759132,153,675

Vanadium		891,286,34494337,202,481

Perfluoroheptanoic acid (PFHPA)		311,225,618714,605,414

Carbon tetrachloride		9902,34212952,721

Trichloroethylene		30824,088869,178,511

Perchlorate		35706,248833,948,334

N-Nitrosodimethylamine (NDMA)		7561,792746,621,787

Perfluorononanoic acid (PFNA)		11373,373534,031,311

Manganese		259218,9481,42436,964,784

Bromodichloroacetic acid		3186,0893186,089

Chlorodibromoacetic acid		3186,0893186,089

Thallium		28172,92930239,237

Tritium		4123,54014110,685,722

Ethylene dibromide		367,8097442,959

Aluminum		1163,29058918,468,292

Cadmium		3151,58842113,907

Benzene		234,056549,417

Antimony		924,8942232,937

Molybdenum		317,52747733,703,593

Atrazine		16,309213,809

Selenium		133,1643856,300,816

Dichloromethane (methylene chloride)		42,951671,969,650

1,2-Dichloropropane		27718530,614

Barium		37101,06023,971,405

Styrene		218744,012

Beryllium		116045,713

Mercury (inorganic)		2692591,661

Contaminants found in California above legal limits

Contaminant# of UtilitiesPeople Served

Nitrate and nitrite		24175,744

Arsenic		10889,566

Nitrate		3741,782

Total trihalomethanes (TTHMs)		2341,415

Trichloroethylene		132,230

Tetrachloroethylene (perchloroethylene)		316,312

Uranium		3713,037

Haloacetic acids (HAA5)		152,590

Fluoride		22,215

Selenium		71,230

Radium, combined (-226 & -228)		2907

1,2-Dibromo-3-chloropropane (DBCP)		1438

Ethylene dibromide		1158

Nitrite		1112

Cadmium		187

Dichloromethane (methylene chloride)		159