County · California

Los Angeles County, California: drinking water records

Name: Drinking water records for Los Angeles County, California
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 199 community water systems across 295 ZIP codes in Los Angeles County, then find water-testing resources and available recent monitoring-station readings.

In focus199Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 118 of the 199 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

118

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 199 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Los Angeles-City, Dept. of Water & Power CA1910067	3,875,566	480	0	1	3.9 ppbbelow the action level
San Gabriel Valley Water Co.-El Monte CA1910039	248,000	540	2	2	0 ppbbelow the action level
Downey - City, Water Dept. CA1910034	110,556	300	8	1	0 ppbbelow the action level
Monterey Park-City, Water Dept. CA1910092	62,183	60	2	1	0 ppbbelow the action level
La Verne, City WD CA1910062	31,334	370	0	1	9 ppbbelow the action level
Calif State Polytechnical Univ - Pomona CA1910022	29,854	30	4	3	0.8 ppbbelow the action level
Signal Hill - City, Water Dept. CA1910149	11,848	240	0	5	6.6 ppbbelow the action level
Long Beach Utilities Department CA1910065	466,772	240	0	0	1.0 ppbbelow the action level
Santa Clarita Valley Water Agency CA1910240	294,090	540	8	0	0 ppbbelow the action level
Gswc - Southwest CA1910155	277,740	540	0	0	0 ppbbelow the action level
Los Angeles Cwwd 40 Reg 4 & 34 Lancaster CA1910070	208,129	840	0	0	1.8 ppbbelow the action level
Glendale-City, Water Dept. CA1910043	188,784	360	8	0	0 ppbbelow the action level
Suburban Water Systems-San Jose CA1910205	168,843	600	4	0	0 ppbbelow the action level
Pasadena Water and Power CA1910124	164,344	420	0	0	0 ppbbelow the action level
California Water Service Co. - Ela CA1910036	152,474	660	5	0	0 ppbbelow the action level
Pomona - City, Water Dept. CA1910126	151,713	900	6	0	2.1 ppbbelow the action level
California Water Service Co. - Dominguez CA1910033	143,996	570	1	0	1.8 ppbbelow the action level
Palmdale Water Dist. CA1910102	126,804	360	3	0	0 ppbbelow the action level
Azusa Light and Water CA1910007	110,044	360	3	0	0 ppbbelow the action level
Torrance-City, Water Dept. CA1910213	106,183	240	0	0	0 ppbbelow the action level
Burbank-City, Water Dept. CA1910179	105,603	120	3	0	0 ppbbelow the action level
Walnut Valley Water District CA1910234	100,941	240	0	0	0 ppbbelow the action level
California Water Service Co. - Herm/Redo CA1910134	96,853	240	0	0	1.4 ppbbelow the action level
Santa Monica-City, Water Division CA1910146	89,947	240	6	0	1.4 ppbbelow the action level
Inglewood- City, Water Dept. CA1910051	80,824	180	1	0	0 ppbbelow the action level
City of Alhambra CA1910001	79,776	210	0	0	0 ppbbelow the action level
South Gate-City, Water Dept. CA1910152	76,443	300	6	0	0 ppbbelow the action level
Compton-City, Water Dept. CA1910026	74,877	390	3	0	0 ppbbelow the action level
Liberty Utilities - Bellflower-Norwalk CA1910211	72,624	600	8	0	1.9 ppbbelow the action level
Las Virgenes MWD CA1910225	72,602	480	0	0	0 ppbbelow the action level
California Water Service Co. - Palos Ver CA1910104	71,452	120	0	0	1.6 ppbbelow the action level
Valley County Water Dist. CA1910009	68,871	180	0	0	0 ppbbelow the action level
Lynwood-City, Water Dept. CA1910079	66,967	420	4	0	0 ppbbelow the action level
Lakewood - City, Water Dept. CA1910239	66,135	180	2	0	0 ppbbelow the action level
Suburban Water Systems-Whittier CA1910174	66,045	60	6	0	0 ppbbelow the action level
Gswc - Florence/Graham CA1910077	63,472	240	0	0	0 ppbbelow the action level
Suburban Water Systems-La Mirada CA1910059	56,793	180	6	0	0 ppbbelow the action level
Gswc-San Dimas CA1910142	56,538	600	2	0	0 ppbbelow the action level
Rowland Water District CA1910194	56,100	420	1	0	0 ppbbelow the action level
Paramount - City, Water Dept. CA1910105	55,200	180	0	0	0 ppbbelow the action level
Gswc - Bell, Bell Gardens CA1910011	55,050	357	6	0	0 ppbbelow the action level
City of Arcadia CA1910003	51,361	540	2	0	1.9 ppbbelow the action level
Gswc - Artesia CA1910004	50,415	297	2	0	0 ppbbelow the action level
Whittier-City, Water Dept. CA1910173	49,954	60	6	0	0 ppbbelow the action level
Glendora-City, Water Dept. CA1910044	49,934	240	0	0	0 ppbbelow the action level
Cal/Am Water Company - San Marino CA1910139	47,995	480	1	0	0 ppbbelow the action level
Cerritos - City, Water Dept. CA1910019	47,475	300	1	0	0 ppbbelow the action level
Bellflower - Somerset Mwc CA1910013	46,300	360	2	0	0 ppbbelow the action level
Hawthorne-City Water Dept. CA1910047	44,718	180	0	0	0 ppbbelow the action level
Gswc - Norwalk CA1910098	43,167	416	3	0	0 ppbbelow the action level
Pico Rivera - City, Water Dept. CA1910042	40,600	450	9	0	0 ppbbelow the action level
Beverly Hills-City, Water Dept. CA1910156	40,121	180	0	0	0 ppbbelow the action level
Gswc - Claremont CA1910024	39,730	780	7	0	5.7 ppbbelow the action level
San Gabriel County WD CA1910144	39,345	240	0	0	0 ppbbelow the action level
Gswc - Culver City CA1910030	38,233	120	0	0	5.6 ppbbelow the action level
Monrovia-City, Water Dept. CA1910090	37,931	60	6	0	0 ppbbelow the action level
Crescenta Valley Cwd CA1910028	35,841	478	6	0	0 ppbbelow the action level
Covina-City, Water Dept. CA1910127	33,300	360	0	0	0 ppbbelow the action level
Manhattan Beach-City, Water Dept. CA1910083	32,697	240	0	0	5.4 ppbbelow the action level
Los Angeles Cwwd 29 & 80-Malibu CA1910204	32,348	65	0	0	0 ppbbelow the action level
Vernon-City, Water Dept. CA1910167	28,112	480	0	0	0 ppbbelow the action level
Gswc-South Arcadia CA1910212	27,072	300	3	0	0 ppbbelow the action level
Montebello Land & Water Co. CA1910091	26,554	180	8	0	4.2 ppbbelow the action level
Liberty Utilities - Compton CA1910021	26,371	360	0	0	0 ppbbelow the action level
Gswc-South San Gabriel CA1910223	26,240	240	1	0	0 ppbbelow the action level
City of South Pasadena CA1910154	25,329	120	0	0	0 ppbbelow the action level
Sunny Slope Water Co. CA1910157	25,252	120	0	0	0 ppbbelow the action level
Orchard Dale Water District CA1910101	25,000	60	7	0	1 ppbbelow the action level
Cal-Am Water Company - Duarte CA1910186	24,773	480	1	0	1 ppbbelow the action level
Liberty Utilities - Lynwood CA1910161	24,701	240	3	0	0.9 ppbbelow the action level
San Fernando-City, Water Dept. CA1910143	23,946	240	0	0	0 ppbbelow the action level
El Monte-City, Water Dept. CA1910038	22,968	240	2	0	3.9 ppbbelow the action level
Pico WD CA1910125	22,051	240	9	0	0 ppbbelow the action level
Cal/Am Water Company - Baldwin Hills CA1910052	20,724	420	0	0	2 ppbbelow the action level
Norwalk - City, Water Dept. CA1910191	20,283	600	5	0	0 ppbbelow the action level
Lomita-City, Water Dept. CA1910073	20,256	90	2	0	0 ppbbelow the action level
Santa Fe Springs - City, Water Dept. CA1910245	19,219	180	5	0	0 ppbbelow the action level
Quartz Hill Water Dist. CA1910130	19,100	300	0	0	0 ppbbelow the action level
El Segundo-City, Water Dept. CA1910040	16,445	95	0	0	0 ppbbelow the action level
Walnut Park Mutual Water Co. CA1910169	16,180	60	0	0	0 ppbbelow the action level
Lincoln Avenue Water Co. CA1910063	16,088	120	0	0	0 ppbbelow the action level
Huntington Park-City, Water Dept. CA1910049	15,437	419	3	0	0 ppbbelow the action level
South Montebello Irrigation Dist. CA1910153	15,021	120	6	0	0 ppbbelow the action level
Tract 180 Mutual Water Co. CA1910159	14,000	120	4	0	0 ppbbelow the action level
Los Angeles Cwwd 40, Reg. 38-Lake la CA1910005	12,568	180	0	0	0 ppbbelow the action level
Los Angeles Cwwd 40, R 24,27,33-Pearblsm CA1910203	11,509	5	0	0	0 ppbbelow the action level
City of Bell Gardens CA1910108	11,437	180	7	0	0 ppbbelow the action level
Sierra Madre-City, Water Dept. CA1910148	11,000	120	0	0	0 ppbbelow the action level
Gswc - Willowbrook CA1910072	10,793	145	0	0	0 ppbbelow the action level
Valley Water Co. CA1910166	10,070	120	0	0	0 ppbbelow the action level
Cal-Am Water Company - East Pasadena CA1910020	9,949	120	0	0	1 ppbbelow the action level
San Gabriel Valley Water Co-Montebello 1 CA1910189	9,630	60	0	0	0 ppbbelow the action level
La Canada Irrigation Dist. CA1910054	9,300	120	0	0	0 ppbbelow the action level
Rubio Canon Land & Water Association CA1910140	9,215	480	7	0	0 ppbbelow the action level
Tract 349 Mutual Water Co. CA1910160	8,700	120	4	0	0 ppbbelow the action level
La Puente Valley Cwd CA1910060	8,243	60	0	0	0 ppbbelow the action level
Gswc - Hollydale CA1910195	8,099	120	1	0	0 ppbbelow the action level
Valencia Heights Water Co. CA1910163	7,775	240	6	0	0 ppbbelow the action level
San Gabriel Valley Water Co-Montebello 2 CA1910117	7,330	180	0	0	0 ppbbelow the action level
Peter Pitchess Honor Rancho Detn. Ctr CA1900046	7,000	60	3	0	0 ppbbelow the action level
Los Angeles Cwwd 36-Val Verde CA1910185	6,376	120	0	0	0 ppbbelow the action level
Maywood Mutual Water Co. #2 CA1910085	6,349	120	1	0	0 ppbbelow the action level
City of Industry Waterworks Systems CA1910029	6,158	60	0	0	0 ppbbelow the action level
Maywood Mutual Water Co. #3 CA1910086	6,059	180	3	0	0 ppbbelow the action level
Bellflower Municipal Water System CA1910018	5,999	180	4	0	0 ppbbelow the action level
Palm Ranch Irrigation Dist. CA1910103	5,507	60	0	0	0 ppbbelow the action level
Maywood Mutual Water Co. #1 CA1910084	5,500	120	1	0	0 ppbbelow the action level
La Habra Heights Cwd CA1910218	5,325	180	7	0	0 ppbbelow the action level
Suburban Water Systems-Glendora CA1910046	5,249	120	0	0	0 ppbbelow the action level
Las Flores Water Co. CA1910061	4,847	120	0	0	0 ppbbelow the action level
Los Angeles Cwwd 37-Acton CA1910248	4,805	120	0	0	0 ppbbelow the action level
Valley View Mutual Water Co. CA1910165	4,613	60	0	0	0 ppbbelow the action level
Suburban Water Systems - Sativa CA1910147	4,363	60	2	0	0 ppbbelow the action level
Commerce-City, Water Dept. CA1910050	4,205	240	6	0	0 ppbbelow the action level
So. Cal. Edison Co.-Santa Catalina CA1910006	3,822	575	1	0	0 ppbbelow the action level
Littlerock Creek Irrigation Dist. CA1910064	3,040	300	0	0	0 ppbbelow the action level
Land Projects Mutual Water Co. CA1910246	2,800	0	0	36	0 ppbbelow the action level
Lake Elizabeth Mutual Water Co. CA1910056	1,790	0	0	1	0 ppbbelow the action level
White Fence Farms Mwc No. 1 CA1910249	1,518	0	0	2	0 ppbbelow the action level
Lynwood Park Mutual Water Co. CA1910081	1,500	0	0	2	0 ppbbelow the action level
California Water Service Co.-Lancaster CA1910010	1,387	120	0	0	0 ppbbelow the action level
Green Valley Cwd CA1910244	1,275	0	0	1	0 ppbbelow the action level
Averydale Mwc CA1910023	1,023	120	0	0	0 ppbbelow the action level
Del Rio Mutual CA1900130	700	0	0	1	0 ppbbelow the action level
Hemlock Mutual Water Co. CA1910053	686	0	0	1	0 ppbbelow the action level
Llano del Rio Water Company CA1900849	545	0	0	1	0 ppbbelow the action level
Golden Sands Mobile Home Park CA1900649	450	0	0	1	0 ppbbelow the action level
Sunnyside Farms Mutual Water Company CA1900146	436	0	0	1	13 ppbbelow the action level
Llano Mutual Water Company CA1900303	245	0	0	1	6.8 ppbbelow the action level
Sterling Mutual Water Company CA1910158	198	0	0	1	0 ppbbelow the action level
Los Angeles Residential Community Founda CA1900062	184	0	0	1	0 ppbbelow the action level
Alpine Springs Mobile Home Park CA1900942	175	0	0	1	0 ppbbelow the action level
Mettler Valley Mutual CA1900100	160	0	0	22	0 ppbbelow the action level
Sleepy Valley Water Company CA1900903	160	0	0	1	0 ppbbelow the action level
Oak Grove Mobile Home Park CA1900537	109	0	0	1	0 ppbbelow the action level
North Trails Mutual Water Company CA1907014	100	0	0	16	0 ppbbelow the action level
The Village Mobile Home Park CA1900520	71	0	0	31	0 ppbbelow the action level
Fenner Canyon Youth Conservation Camp CA1910801	65	0	0	1	0 ppbbelow the action level
Lancaster Park Mobile Home Park CA1900038	60	0	0	32	0 ppbbelow the action level
The Painted Turtle Camp CA1900074	57	0	0	1	0 ppbbelow the action level
Blue Skies Trailer Park CA1900055	56	0	0	1	0 ppbbelow the action level
Winterhaven Mobile Estates CA1900961	56	0	0	25	0 ppbbelow the action level
Little Baldy Water CA1900158	55	0	0	1	0 ppbbelow the action level
Colorado Mutual Water Company CA1900801	39	0	0	1	0 ppbbelow the action level
Rivers End Trailer Park CA1900868	35	0	0	1	0 ppbbelow the action level
The River Community CA1900616	35	0	0	1	0.4 ppbbelow the action level
Mitchell'S Avenue E Mobile Home Park CA1900785	24	0	0	20	0 ppbbelow the action level
Amarillo Mutual Water Company CA1910002	3,134	0	0	0	5.1 ppbbelow the action level
Kinneloa Irrigation Dist. CA1910035	1,960	0	0	0	0 ppbbelow the action level
Liberty Utilities - Mesa Crest CA1910241	1,619	0	0	0	1.8 ppbbelow the action level
Suburban Water Systems-Covina Knolls CA1910200	1,437	0	0	0	0 ppbbelow the action level
Bellflower Home Garden Water Company CA1910012	1,129	0	0	0	0 ppbbelow the action level
Sundale Mutual Water Company A, B CA1900563	1,050	0	0	0	0 ppbbelow the action level
Los Angeles Cwwd 40, Reg. 39-Rock Creek CA1910025	994	0	0	0	0 ppbbelow the action level
California Water Service Co-Lake Hughes CA1910242	929	0	0	0	3.3 ppbbelow the action level
California Water Service Co-Leona Valley CA1910243	878	0	0	0	14.7 ppbbelow the action level
West Valley County Water District CA1909006	798	0	0	0	0 ppbbelow the action level
White Fence Farms Mwc No.3 CA1900523	749	0	0	0	5.9 ppbbelow the action level
Los Angeles Cwwd 21-Kagel Canyon CA1910075	708	0	0	0	0 ppbbelow the action level
El Dorado Mutual Water Co. CA1900803	660	0	0	0	0 ppbbelow the action level
Lily of the Valley Mobile Village CA1900913	657	0	0	0	0 ppbbelow the action level
Los Angeles Cwwd 40, Reg. 35-N.E. L.A. CA1910027	612	0	0	0	0 ppbbelow the action level
Landale Mutual Water Company CA1900809	550	0	0	0	0 ppbbelow the action level
Sherwood Mobile Home Park CA1900907	540	0	0	0	0 ppbbelow the action level
Westside Park Mutual Water CA1900102	495	0	0	0	0 ppbbelow the action level
Shadow Acres Mutual Water Company CA1900301	450	0	0	0	0 ppbbelow the action level
Antelope Park Mutual Water Company CA1900794	445	0	0	0	0 ppbbelow the action level
Californian Mobile Home Park CA1900843	372	0	0	0	0 ppbbelow the action level
Paradise Ranch MHP CA1910099	360	0	0	0	2.3 ppbbelow the action level
Leisure Lake Mobile Estates CA1910066	325	0	0	0	4.6 ppbbelow the action level
El Rancho Mobile Home Park CA1900636	215	0	0	0	0 ppbbelow the action level
Spv Water Company CA1907028	211	0	0	0	0 ppbbelow the action level
Western Skies Mobile Home Park CA1900541	198	0	0	0	0 ppbbelow the action level
Aqua J. Mutual Water Company CA1900936	158	0	0	0	0 ppbbelow the action level
Desert Palms Mobile Home Park CA1900693	140	0	0	0	2.1 ppbbelow the action level
Terra Nova Mobile Home Park CA1900721	140	0	0	0	0 ppbbelow the action level
Clear Skies Mobile Home Park CA1900817	131	0	0	0	0 ppbbelow the action level
Wilsona Gardens Mutual CA1900155	129	0	0	0	0 ppbbelow the action level
Fire Suppression Camp #19 CA1900901	125	0	0	0	0 ppbbelow the action level
California Conservation Camp #14 CA1900007	107	0	0	0	2 ppbbelow the action level
Cali Lake RV Resort CA1900975	99	0	0	0	0 ppbbelow the action level
Evergreen Mutual Water Company CA1900804	98	0	0	0	0 ppbbelow the action level
Camp Williams-Resort Water CA1900529	80	0	0	0	0 ppbbelow the action level
Lancaster Water Company CA1900808	80	0	0	0	0 ppbbelow the action level
Reesedale Mutual CA1900145	76	0	0	0	0 ppbbelow the action level
Tierra Bonita Mutual Water CA1900154	75	0	0	0	0 ppbbelow the action level
Golden Valley Municipal Water District CA1900767	70	0	0	0	0 ppbbelow the action level
Los Angeles, City of - Power Plant #2 CA1900542	44	0	0	0	0.8 ppbbelow the action level
Bleich Flats Mutual CA1900075	42	0	0	0	0 ppbbelow the action level
Los Angeles, City of - Power Plant #1 CA1900555	29	0	0	0	1.7 ppbbelow the action level
Mescal Creek Water, INC CA1900147	25	0	0	1	not reported
Valhalla Water Association CA1900599	25	0	0	0	0.8 ppbbelow the action level
Casa Dulce Estates CA1900717	24	0	0	0	0 ppbbelow the action level
California Domestic Water Company CA1910199	0	0	0	0	0 ppbbelow the action level
Antelope Valley East Kern Water Agency CA1910045	0	0	0	0	not reported
Covina Valley Water Company - Wholesale CA1910128	0	0	0	0	not reported
Foothill Municipal Water Dist. CA1910032	0	0	0	0	not reported
Metropolitan Water Dist. of So. Cal. CA1910087	0	0	0	0	not reported
Three Valleys MWD CA1910041	0	0	0	0	not reported

USGS · Monitoring stations

The water, more recently.

Available station readings in Los Angeles County, California. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Los Angeles County

295ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Acton
Agoura Hills
Agua Dulce
Alhambra
Alondra Park
Altadena
Arcadia
Artesia
Avalon
Azusa
Bell
Bellflower
Beverly Hills
Bradbury
Burbank
Calabasas
Carson
Castaic
Cerritos
Claremont
Commerce
Compton
Covina
Culver City
Diamond Bar
Downey
Duarte
East Los Angeles
East San Gabriel
El Monte
El Segundo
Florence-Graham
Gardena
Glendale
Glendora
Hacienda Heights
Hawaiian Gardens
Hawthorne
Hermosa Beach
Huntington Park
Industry
Inglewood
Irwindale
La Cañada Flintridge
La Crescenta-Montrose
La Mirada
La Puente
La Verne
Ladera Heights
Lake Hughes
Lakewood
Lancaster
Lawndale
Lennox
Lomita
Long Beach
Los Angeles
Lynwood
Malibu
Manhattan Beach
Maywood
Monrovia
Montebello
Monterey Park
Norwalk
Palmdale
Palos Verdes Estates
Paramount
Pasadena
Pepperdine University
Pico Rivera
Pomona
Rancho Palos Verdes
Redondo Beach
Rosemead
Rowland Heights
San Dimas
San Fernando
San Gabriel
San Marino
Santa Clarita
Santa Fe Springs
Santa Monica
Sierra Madre
Signal Hill
South El Monte
South Gate
South Pasadena
South Whittier
Stevenson Ranch
Sun Village
Temple City
Topanga
Torrance
Vernon
Walnut
West Carson
West Covina
West Rancho Dominguez
West Whittier-Los Nietos
Whittier
Wrightwood

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

90001Florence-Graham
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90035Los Angeles
90036Los Angeles
90037Los Angeles
90038Los Angeles
90039Los Angeles
90040Commerce
90041Los Angeles
90042Los Angeles
90043Los Angeles
90044Los Angeles
90045Los Angeles
90046Los Angeles
90047Los Angeles
90048Los Angeles
90049Los Angeles
90052Los Angeles
90056Ladera Heights
90057Los Angeles
90058Vernon
90059Los Angeles
90061West Rancho Dominguez
90062Los Angeles
90063East Los Angeles
90064Los Angeles
90065Los Angeles
90066Los Angeles
90067Los Angeles
90068Los Angeles
90069Los Angeles
90071Los Angeles
90073
90077Los Angeles
90079Los Angeles
90089Los Angeles
90094Los Angeles
90095Los Angeles
90201Bell
90210Los Angeles
90211Beverly Hills
90212Beverly Hills
90220Compton
90221Compton
90222Compton
90230Culver City
90232Culver City
90240Downey
90241Downey
90242Downey
90245El Segundo
90247Gardena
90248Los Angeles
90249Gardena
90250Hawthorne
90254Hermosa Beach
90255Huntington Park
90260Lawndale
90262Lynwood
90263Pepperdine University
90265Malibu
90266Manhattan Beach
90270Maywood
90272Los Angeles
90274Palos Verdes Estates
90275Rancho Palos Verdes
90277Redondo Beach
90278Redondo Beach
90280South Gate
90290Topanga
90291Los Angeles
90292Los Angeles
90293Los Angeles
90301Inglewood
90302Inglewood
90303Inglewood
90304Lennox
90305Inglewood
90401Santa Monica
90402Santa Monica
90403Santa Monica
90404Santa Monica
90405Santa Monica
90501Torrance
90502West Carson
90503Torrance
90504Torrance
90505Torrance
90506Alondra Park
90601Whittier
90602Whittier
90603Whittier
90604South Whittier
90605Whittier
90606West Whittier-Los Nietos
90638La Mirada
90639La Mirada
90640Montebello
90650Norwalk
90660Pico Rivera
90670Santa Fe Springs
90701Artesia
90703Cerritos
90704Avalon
90706Bellflower
90710Los Angeles
90712Lakewood
90713Lakewood
90715Lakewood
90716Hawaiian Gardens
90717Lomita
90723Paramount
90731Los Angeles
90732Los Angeles
90744Los Angeles
90745Carson
90746Carson
90747Carson
90755Signal Hill
90802Long Beach
90803Long Beach
90804Long Beach
90805Long Beach
90806Long Beach
90807Long Beach
90808Long Beach
90810Carson
90813Long Beach
90814Long Beach
90815Long Beach
90822Long Beach
90831Long Beach
90840Long Beach
91001Altadena
91006Arcadia
91007Arcadia
91008Bradbury
91010Duarte
91011La Cañada Flintridge
91016Monrovia
91020La Crescenta-Montrose
91024Sierra Madre
91030South Pasadena
91040Los Angeles
91042Los Angeles
91046Glendale
91101Pasadena
91103Pasadena
91104Pasadena
91105Pasadena
91106Pasadena
91107Pasadena
91108San Marino
91125Pasadena
91201Glendale
91202Glendale
91203Glendale
91204Glendale
91205Glendale
91206Glendale
91207Glendale
91208Glendale
91210Glendale
91214Glendale
91301Agoura Hills
91302Calabasas
91303Los Angeles
91304Los Angeles
91306Los Angeles
91307Los Angeles
91311Los Angeles
91316Los Angeles
91321Santa Clarita
91324Los Angeles
91325Los Angeles
91326Los Angeles
91330Los Angeles
91331Los Angeles
91335Los Angeles
91340San Fernando
91342Los Angeles
91343Los Angeles
91344Los Angeles
91345Los Angeles
91350Santa Clarita
91351Santa Clarita
91352Los Angeles
91354Santa Clarita
91355Santa Clarita
91356Los Angeles
91364Los Angeles
91367Los Angeles
91371Los Angeles
91381Stevenson Ranch
91384Castaic
91387Santa Clarita
91390Agua Dulce
91401Los Angeles
91402Los Angeles
91403Los Angeles
91405Los Angeles
91406Los Angeles
91411Los Angeles
91423Los Angeles
91436Los Angeles
91501Burbank
91502Burbank
91504Burbank
91505Burbank
91506Burbank
91601Los Angeles
91602Los Angeles
91604Los Angeles
91605Los Angeles
91606Los Angeles
91607Los Angeles
91608Los Angeles
91702Azusa
91706Irwindale
91711Claremont
91722Covina
91723Covina
91724Covina
91731El Monte
91732El Monte
91733South El Monte
91740Glendora
91741Glendora
91744La Puente
91745Hacienda Heights
91746Industry
91748Rowland Heights
91750La Verne
91754Monterey Park
91755Monterey Park
91759Claremont
91765Diamond Bar
91766Pomona
91767Pomona
91768Pomona
91770Rosemead
91773San Dimas
91775East San Gabriel
91776San Gabriel
91780Temple City
91789Walnut
91790West Covina
91791West Covina
91792West Covina
91801Alhambra
91803Alhambra
92397Wrightwood
93510Acton
93532Lake Hughes
93534Lancaster
93535Lancaster
93536Lancaster
93543Sun Village
93544
93550Palmdale
93551Palmdale
93552Palmdale
93553
93563
93591Palmdale

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 64 of the 118 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter25 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Los Angeles County

All California counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.