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Los Angeles County · tap water by city

Los Angeles County tap water, city by city.

FilteredWTR tracks 117 public water systems in Los Angeles County, and their own population counts add up to 9,993,771 people. Over the last three years three of them picked up health-based violations on the EPA record, and the table below shows which. In the latest round of lead testing, 89 systems reported a 90th-percentile result of zero. Two came in at or above 0.0075 mg/L, half the federal action level of 0.015 mg/L.

Water systems in Los Angeles County

The largest systems come first. Lead is each system's most recent 90th-percentile result from the federal Lead and Copper Rule, and the last column counts health-based violations from the last three years. Systems sample on their own schedules, so their monitoring periods end anywhere from 2022 to 2028.

Water systemCities servedPeople servedLatest lead (90th percentile)Recent health violations
Los Angeles-City, Dept. of Water & PowerLos Angeles3,875,5660.0039 mg/L, period ending 20230
Long Beach Utilities DepartmentLong Beach466,7720.00097 mg/L, period ending 20250
Santa Clarita Valley Water AgencyCanyon Country, Castaic, Newhall, Santa Clarita, Saugus, Valencia292,014Not detected, period ending 20250
GSWC - SouthwestGardena, Lawndale, Willowbrook277,7400.0017 mg/L, period ending 20260
San Gabriel Valley Water Co.-El MonteNot listed240,000Not detected, period ending 20260
Los Angeles CWWD 40 Reg 4 & 34 LancasterLancaster208,1290.0018 mg/L, period ending 20250
Glendale-City, Water Dept.Glendale192,2120.0053 mg/L, period ending 20260
Suburban Water Systems-San JoseWalnut, West Covina170,523Not detected, period ending 20250
Pasadena Water and PowerPasadena165,4480.0019 mg/L, period ending 20260
Pomona - City, Water Dept.Pomona151,7130.0021 mg/L, period ending 20250
California Water Service Co. - DominguezCarson149,4900.0018 mg/L, period ending 20230
California Water Service Co. - ELAEast Los Angeles142,140Not detected, period ending 20260
Palmdale Water Dist.Palmdale126,804Not detected, period ending 20240
Downey - City, Water Dept.Downey110,556Not detected, period ending 20230
Azusa Light and WaterAzusa110,044Not detected, period ending 20260
Torrance-City, Water Dept.Torrance106,183Not detected, period ending 20260
Burbank-City, Water Dept.Burbank106,1460.00086 mg/L, period ending 20260
Walnut Valley Water DistrictDiamond Bar100,941Not detected, period ending 20240
California Water Service Co. - Herm/RedoHermosa Beach, Redondo Beach100,0720.0014 mg/L, period ending 20230
Compton-City, Water Dept.Compton90,986Not detected, period ending 20240
Santa Monica-City, Water DivisionSanta Monica90,7290.0014 mg/L, period ending 20250
South Gate-City, Water Dept.South Gate88,544Not detected, period ending 20240
Inglewood- City, Water Dept.Inglewood81,1910.0014 mg/L, period ending 20260
City of AlhambraAlhambra80,279Not detected, period ending 20270
Las Virgenes MWDAgoura Hills, Calabasas, Hidden Hills, Westlake Village77,562Not detected, period ending 20240
Liberty Utilities - Bellflower-NorwalkBellflower72,472Not detected, period ending 20280
California Water Service Co. - Palos VerNot listed70,830Not detected, period ending 20260
Valley County Water Dist.Not listed68,871Not detected, period ending 20260
Lynwood-City, Water Dept.Lynwood66,967Not detected, period ending 20240
Suburban Water Systems-WhittierLa Mirada66,565Not detected, period ending 20250
Lakewood - City, Water Dept.Lakewood66,356Not detected, period ending 20260
GSWC - Florence/GrahamFlorence-Graham63,472Not detected, period ending 20250
Monterey Park-City, Water Dept.Monterey Park61,096Not detected, period ending 20241
Suburban Water Systems-La MiradaNot listed57,240Not detected, period ending 20250
GSWC-San DimasSan Dimas56,5640.0021 mg/L, period ending 20260
Rowland Water DistrictNot listed56,100Not detected, period ending 20240
Paramount - City, Water Dept.Paramount55,200Not detected, period ending 20280
GSWC - Bell, Bell GardensBell, Bell Gardens55,050Not detected, period ending 20250
City of ArcadiaArcadia54,2360.0019 mg/L, period ending 20250
GSWC - ArtesiaArtesia50,415Not detected, period ending 20250
Whittier-City, Water Dept.Whittier49,954Not detected, period ending 20250
Cal/Am Water Company - San MarinoNot listed48,065Not detected, period ending 20260
Cerritos - City, Water Dept.Cerritos46,851Not detected, period ending 20280
Bellflower - Somerset MWCNot listed46,300Not detected, period ending 20260
Hawthorne-City Water Dept.Hawthorne46,039Not detected, period ending 20260
Glendora-City, Water Dept.Glendora44,411Not detected, period ending 20250
GSWC - NorwalkNorwalk43,167Not detected, period ending 20250
San Gabriel County WDNot listed40,154Not detected, period ending 20250
Beverly Hills-City, Water Dept.Beverly Hills39,922Not detected, period ending 20240
GSWC - ClaremontClaremont39,7760.0056 mg/L, period ending 20260
Pico Rivera - City, Water Dept.Pico Rivera39,451Not detected, period ending 20250
GSWC - Culver CityCulver City, Santa Fe Springs38,2330.0056 mg/L, period ending 20250
Monrovia-City, Water Dept.Monrovia37,931Not detected, period ending 20240
Manhattan Beach-City, Water Dept.Manhattan Beach34,0510.0054 mg/L, period ending 20250
Covina-City, Water Dept.Covina33,300Not detected, period ending 20250
La Verne, City WDLa Verne31,3340.009 mg/L, period ending 20240
Los Angeles CWWD 29 & 80-MalibuMalibu, Topanga31,3160.009 mg/L, period ending 20260
Crescenta Valley CWDLa Crescenta, Montrose28,162Not detected, period ending 20260
Vernon-City, Water Dept.Vernon28,112Not detected, period ending 20230
GSWC-South ArcadiaNot listed27,4300.00066 mg/L, period ending 20260
Montebello Land & Water Co.Not listed26,554Not detected, period ending 20260
GSWC-South San GabrielSouth San Gabriel26,4510.00059 mg/L, period ending 20260
Liberty Utilities - ComptonNot listed26,316Not detected, period ending 20260
City of South PasadenaSouth Pasadena25,329Not detected, period ending 20240
Sunny Slope Water Co.Not listed25,252Not detected, period ending 20220
Orchard Dale Water DistrictNot listed25,000Not detected, period ending 20260
Cal-Am Water Company - DuarteDuarte24,7670.001 mg/L, period ending 20240
Liberty Utilities - LynwoodNot listed24,6490.00085 mg/L, period ending 20250
San Fernando-City, Water Dept.San Fernando23,364Not detected, period ending 20230
El Monte-City, Water Dept.El Monte23,000Not detected, period ending 20260
Pico WDNot listed22,051Not detected, period ending 20230
Cal/Am Water Company - Baldwin HillsNot listed20,7240.003 mg/L, period ending 20260
Norwalk - City, Water Dept.Norwalk20,283Not detected, period ending 20280
Lomita-City, Water Dept.Lomita20,256Not detected, period ending 20230
Quartz Hill Water Dist.Not listed19,322Not detected, period ending 20250
Santa Fe Springs - City, Water Dept.Santa Fe Springs19,219Not detected, period ending 20250
El Segundo-City, Water Dept.El Segundo16,777Not detected, period ending 20230
Walnut Park Mutual Water Co.Not listed16,180Not detected, period ending 20260
Huntington Park-City, Water Dept.Huntington Park15,437Not detected, period ending 20250
South Montebello Irrigation Dist.Not listed15,021Not detected, period ending 20250
Tract 180 Mutual Water Co.Not listed14,000Not detected, period ending 20250
Los Angeles CWWD 40, Reg. 38-Lake LaNot listed12,582Not detected, period ending 20230
Signal Hill - City, Water Dept.Signal Hill11,8480.0029 mg/L, period ending 20263
Los Angeles CWWD 40, R 24,27,33-PearblsmNot listed11,609Not detected, period ending 20230
City of Bell GardensBell Gardens11,413Not detected, period ending 20260
Sierra Madre-City, Water Dept.Sierra Madre11,000Not detected, period ending 20230
GSWC - WillowbrookNot listed10,793Not detected, period ending 20250
Valley Water Co.Not listed10,113Not detected, period ending 20220
Cal-Am Water Company - East PasadenaEast Pasadena9,9630.001 mg/L, period ending 20250
La Canada Irrigation Dist.Not listed9,258Not detected, period ending 20250
Lincoln Avenue Water Co.Not listed8,721Not detected, period ending 20280
Tract 349 Mutual Water Co.Not listed8,700Not detected, period ending 20230
La Puente Valley CWDLa Puente8,276Not detected, period ending 20280
GSWC - HollydaleNot listed8,099Not detected, period ending 20250
Valencia Heights Water Co.Not listed7,775Not detected, period ending 20260
Peter Pitchess Honor Rancho Detn. CtrNot listed7,000Not detected, period ending 20240
Los Angeles CWWD 36-Val VerdeNot listed6,712Not detected, period ending 20260
Rubio Canon Land & Water AssociationNot listed6,646Not detected, period ending 20250
Maywood Mutual Water Co. #2Not listed6,349Not detected, period ending 20250
City of Industry Waterworks SystemsCity Of Industry, La Puente6,151Not detected, period ending 20250
Maywood Mutual Water Co. #3Not listed6,059Not detected, period ending 20250
Bellflower Municipal Water SystemBellflower6,032Not detected, period ending 20240
La Habra Heights CWDLa Habra Heights5,682Not detected, period ending 20240
Palm Ranch Irrigation Dist.Not listed5,507Not detected, period ending 20260
Suburban Water Systems-GlendoraNot listed5,301Not detected, period ending 20250
San Gabriel Valley Water Co-Montebello 1Not listed5,205Not detected, period ending 20250
Los Angeles CWWD 37-ActonNot listed4,7820.0011 mg/L, period ending 20260
Valley View Mutual Water Co.Not listed4,613Not detected, period ending 20250
Suburban Water Systems - SativaNot listed4,372Not detected, period ending 20240
Maywood Mutual Water Co. #1Not listed3,851Not detected, period ending 20240
So. Cal. Edison Co.-Santa CatalinaNot listed3,822Not detected, period ending 20230
San Gabriel Valley Water Co-Montebello 2Montebello3,731Not detected, period ending 20230
Commerce-City, Water Dept.Commerce, Montebello3,598Not detected, period ending 20260
Amarillo Mutual Water CompanyNot listed3,134Not detected, period ending 20260
Littlerock Creek Irrigation Dist.Not listed3,066Not detected, period ending 20250
Calif State Polytechnical Univ - PomonaNot listed2,6680.00062 mg/L, period ending 20262
Las Flores Water Co.Not listed2,211Not detected, period ending 20250

Find your city

Each report covers the water system that serves that city, with its measured results and its full EPA compliance history.

What these numbers mean

Every system has to collect tap samples from a set list of homes and report the lead level at the 90th percentile. Nine out of ten sampled homes came in at or below that figure. The federal action level is 0.015 mg/L, and a system that goes over it has to take corrective steps and tell its customers. A zero means the samples came back below what the lab can detect.

A health-based violation means the system broke a rule tied to health, such as going over a contaminant limit or missing a required treatment step. Late paperwork and skipped reports go on the EPA record too, and this page leaves those out.

These figures describe the water each system sends out, and the water at your own faucet can test differently. Lead most often enters from a home's own pipes and fixtures, so houses built before 1986 are worth a closer look. Chlorine levels also drift with how far a street sits from the treatment plant.

Free local water test

See your own water in person before spending money on treatment.

A local FilteredWTR tech screens the water at your faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.

Text 949-414-9944 for a free water test

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