Los Angeles County, California Water Systems

Los Angeles County, California

332 community water systems on record — 199 active, 133 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.

Community water systems in Los Angeles County, California

System name	Mailing city	Population served	Status
LOS ANGELES-CITY, DEPT. OF WATER & POWER	LOS ANGELES	3,875,566	Active
LONG BEACH UTILITIES DEPARTMENT	LONG BEACH	466,772	Active
SANTA CLARITA VALLEY WATER AGENCY	NEWHALL	294,090	Active
GSWC - SOUTHWEST	HAWTHORNE	277,740	Active
SAN GABRIEL VALLEY WATER CO.-EL MONTE	EL MONTE	248,000	Active
LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER	ALHAMBRA	208,129	Active
GLENDALE-CITY, WATER DEPT.	GLENDALE	188,784	Active
SUBURBAN WATER SYSTEMS-SAN JOSE	COVINA	168,843	Active
PASADENA WATER AND POWER	PASADENA	164,344	Active
CALIFORNIA WATER SERVICE CO. - ELA	SAN JOSE	152,474	Active
POMONA - CITY, WATER DEPT.	POMONA	151,713	Active
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ	SAN JOSE	143,996	Active
SANTA CLARITA VALLEY W.A.-SANTA CLARITA	NEWHALL	135,281	Inactive
PALMDALE WATER DIST.	PALMDALE	126,804	Active
DOWNEY - CITY, WATER DEPT.	DOWNEY	110,556	Active
AZUSA LIGHT AND WATER	AZUSA	110,044	Active
TORRANCE-CITY, WATER DEPT.	TORRANCE	106,183	Active
BURBANK-CITY, WATER DEPT.	BURBANK	105,603	Active
WALNUT VALLEY WATER DISTRICT	WALNUT	100,941	Active
CALIFORNIA WATER SERVICE CO. - HERM/REDO	SAN JOSE	96,853	Active
SANTA MONICA-CITY, WATER DIVISION	LOS ANGELES	89,947	Active
INGLEWOOD- CITY, WATER DEPT.	INGLEWOOD	80,824	Active
CITY OF ALHAMBRA	ALHAMBRA	79,776	Active
SOUTH GATE-CITY, WATER DEPT.	SOUTH GATE	76,443	Active
COMPTON-CITY, WATER DEPT.	COMPTON	74,877	Active
LIBERTY UTILITIES - BELLFLOWER-NORWALK	DOWNEY	72,624	Active
LAS VIRGENES MWD	CALABASAS	72,602	Active
CALIFORNIA WATER SERVICE CO. - PALOS VER	SAN JOSE	71,452	Active
VALLEY COUNTY WATER DIST.	BALDWIN PARK	68,871	Active
LYNWOOD-CITY, WATER DEPT.	LYNWOOD	66,967	Active
LAKEWOOD - CITY, WATER DEPT.	LAKEWOOD	66,135	Active
SUBURBAN WATER SYSTEMS-WHITTIER	COVINA	66,045	Active
GSWC - FLORENCE/GRAHAM	ANAHEIM	63,472	Active
MONTEREY PARK-CITY, WATER DEPT.	MONTEREY PARK	62,183	Active
SUBURBAN WATER SYSTEMS-LA MIRADA	COVINA	56,793	Active
GSWC-SAN DIMAS	SAN DIMAS	56,538	Active
ROWLAND WATER DISTRICT	ROWLAND HEIGHTS	56,100	Active
PARAMOUNT - CITY, WATER DEPT.	PARAMOUNT	55,200	Active
GSWC - BELL, BELL GARDENS	ANAHEIM	55,050	Active
CITY OF ARCADIA	ARCADIA	51,361	Active
GSWC - ARTESIA	ANAHEIM	50,415	Active
WHITTIER-CITY, WATER DEPT.	WHITTIER	49,954	Active
GLENDORA-CITY, WATER DEPT.	GLENDORA	49,934	Active
CAL/AM WATER COMPANY - SAN MARINO	ROSEMEAD	47,995	Active
CERRITOS - CITY, WATER DEPT.	CERRITOS	47,475	Active
BELLFLOWER - SOMERSET MWC	BELLFLOWER	46,300	Active
HAWTHORNE-CITY WATER DEPT.	SAN JOSE	44,718	Active
GSWC - NORWALK	ANAHEIM	43,167	Active
PICO RIVERA - CITY, WATER DEPT.	PICO RIVERA	40,600	Active
BEVERLY HILLS-CITY, WATER DEPT.	BEVERLY HILLS	40,121	Active
GSWC - CLAREMONT	SAN DIMAS	39,730	Active
SAN GABRIEL COUNTY WD	ROSEMEAD	39,345	Active
GSWC - CULVER CITY	SANTA FE SPRINGS	38,233	Active
MONROVIA-CITY, WATER DEPT.	MONROVIA	37,931	Active
CRESCENTA VALLEY CWD	LA CRESCENTA	35,841	Active
PARK WATER CO	DOWNEY	35,712	Inactive
COVINA-CITY, WATER DEPT.	COVINA	33,300	Active
MANHATTAN BEACH-CITY, WATER DEPT.	MANHATTAN BEACH	32,697	Active
LOS ANGELES CWWD 29 & 80-MALIBU	ALHAMBRA	32,348	Active
LA VERNE, CITY WD	LA VERNE	31,334	Active
CALIF STATE POLYTECHNICAL UNIV - POMONA	POMONA	29,854	Active
VERNON-CITY, WATER DEPT.	VERNON	28,112	Active
GSWC-SOUTH ARCADIA	SAN DIMAS	27,072	Active
MONTEBELLO LAND & WATER CO.	MONTEBELLO	26,554	Active
LIBERTY UTILITIES - COMPTON	DOWNEY	26,371	Active
GSWC-SOUTH SAN GABRIEL	SAN DIMAS	26,240	Active
CITY OF SOUTH PASADENA	SOUTH PASADENA	25,329	Active
SUNNY SLOPE WATER CO.	PASADENA	25,252	Active
ORCHARD DALE WATER DISTRICT	WHITTIER	25,000	Active
CAL-AM WATER COMPANY - DUARTE	ROSEMEAD	24,773	Active
LIBERTY UTILITIES - LYNWOOD	DOWNEY	24,701	Active
SAN FERNANDO-CITY, WATER DEPT.	SAN FERNANDO	23,946	Active
EL MONTE-CITY, WATER DEPT.	EL MONTE	22,968	Active
PICO WD	PICO RIVERA	22,051	Active
CAL/AM WATER COMPANY - BALDWIN HILLS	ROSEMEAD	20,724	Active
NORWALK - CITY, WATER DEPT.	NORWALK	20,283	Active
LOMITA-CITY, WATER DEPT.	LOMITA	20,256	Active
SANTA FE SPRINGS - CITY, WATER DEPT.	SANTA FE SPRINGS	19,219	Active
QUARTZ HILL WATER DIST.	QUARTZ HILL	19,100	Active
SANTA CLARITA VALLEY W.A.-NEWHALL DIV.	SANTA CLARITA	17,498	Inactive
EL SEGUNDO-CITY, WATER DEPT.	EL SEGUNDO	16,445	Active
WALNUT PARK MUTUAL WATER CO.	HUNTINGTON PARK	16,180	Active
LINCOLN AVENUE WATER CO.	ALTADENA	16,088	Active
SANTA CLARITA VALLEY W.A.-PINETREE DIV.	SANTA CLARITA	15,998	Inactive
HUNTINGTON PARK-CITY, WATER DEPT.	HUNTINGTON PARK	15,437	Active
SOUTH MONTEBELLO IRRIGATION DIST.	MONTEBELLO	15,021	Active
TRACT 180 MUTUAL WATER CO.	CUDAHY	14,000	Active
LOS ANGELES CWWD 40, REG. 38-LAKE LA	ALHAMBRA	12,568	Active
SIGNAL HILL - CITY, WATER DEPT.	SIGNAL HILL	11,848	Active
LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM	ALHAMBRA	11,509	Active
CITY OF BELL GARDENS	DOWNEY	11,437	Active
SIERRA MADRE-CITY, WATER DEPT.	SIERRA MADRE	11,000	Active
GSWC - WILLOWBROOK	ANAHEIM	10,793	Active
VALLEY WATER CO.	LA CANADA FLINTRIDGE	10,070	Active
SANTA CLARITA VALLEY W.A.-CASTAIC DIV.	SANTA CLARITA	9,999	Inactive
CAL-AM WATER COMPANY - EAST PASADENA	ROSEMEAD	9,949	Active
SAN GABRIEL VALLEY WATER CO-MONTEBELLO 1	EL MONTE	9,630	Active
LA CANADA IRRIGATION DIST.	LA CANADA	9,300	Active
RUBIO CANON LAND & WATER ASSOCIATION	ALTADENA	9,215	Active
TRACT 349 MUTUAL WATER CO.	CUDAHY	8,700	Active
LA PUENTE VALLEY CWD	LA PUENTE	8,243	Active
GSWC - HOLLYDALE	ANAHEIM	8,099	Active
SANTA FE LAND IMPROVEMENT	058	8,000	Inactive
PARK WATER CO	DOWNEY	7,900	Inactive
PARK WATER CO-4,7,10,50W	DOWNEY	7,900	Inactive
VALENCIA HEIGHTS WATER CO.	WEST COVINA	7,775	Active
SAN GABRIEL VALLEY WATER CO-MONTEBELLO 2	EL MONTE	7,330	Active
PETER PITCHESS HONOR RANCHO DETN. CTR	CASTAIC	7,000	Active
CALWA COUNTY WATER DIST	FRESNO	6,528	Inactive
SANTA CLARITA VALLEY W.A.-TESORO DIV.	SANTA CLARITA	6,499	Inactive
LOS ANGELES CWWD 36-VAL VERDE	ALHAMBRA	6,376	Active
FRESNO COUNTY WATER WORKS	FRESNO	6,374	Inactive
MAYWOOD MUTUAL WATER CO. #2	MAYWOOD	6,349	Active
SOUTHERN CALIF WATER CO	LOS ANGELES	6,202	Inactive
CITY OF INDUSTRY WATERWORKS SYSTEMS	LA PUENTE	6,158	Active
MAYWOOD MUTUAL WATER CO. #3	MAYWOOD	6,059	Active
BELLFLOWER MUNICIPAL WATER SYSTEM	ROSEMEAD	5,999	Active
PALM RANCH IRRIGATION DIST.	QUARTZ HILL	5,507	Active
MAYWOOD MUTUAL WATER CO. #1	HUNTINGTON PARK	5,500	Active
FRESNO CO WATERWORKS DIST 25	FRESNO	5,450	Inactive
LA HABRA HEIGHTS CWD	LA HABRA HEIGHTS	5,325	Active
SUBURBAN WATER SYSTEMS-GLENDORA	COVINA	5,249	Active
SOUTHERN CALIF WATER CO	LOS ANGELES	5,015	Inactive
LAS FLORES WATER CO.	ALTADENA	4,847	Active
LOS ANGELES CWWD 37-ACTON	ALHAMBRA	4,805	Active
FRESNO COUNTY WATER WORKS	FRESNO	4,753	Inactive
VALLEY VIEW MUTUAL WATER CO.	BALDWIN PARK	4,613	Active
SO CAL WC - LENWOOD	LOS ANGELES	4,496	Inactive
SUBURBAN WATER SYSTEMS - SATIVA	COVINA	4,363	Active
COMMERCE-CITY, WATER DEPT.	SAN JOSE	4,205	Active
SO. CAL. EDISON CO.-SANTA CATALINA	AVALON	3,822	Active
PARK WATER CO SYS NO 50E	DOWNEY	3,500	Inactive
KAVANAGH VISTA WATER COMPANY	FRESNO	3,300	Inactive
MURPHY RANCH MUTUAL WTR C	VALINDA	3,200	Inactive
AMARILLO MUTUAL WATER COMPANY	ROSEMEAD	3,134	Active
SO CA WATER CO-VICTORVILLE 4	SAN DIMAS	3,076	Inactive
LITTLEROCK CREEK IRRIGATION DIST.	LITTLEROCK	3,040	Active
PARLIER, CITY OF	PARLIER	2,990	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	2,958	Inactive
NORTHEAST GARDENS WATER CO	FRESNO	2,870	Inactive
LAND PROJECTS MUTUAL WATER CO.	LANCASTER	2,800	Active
PARK WATER CO SYS NO 15	DOWNEY	2,500	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	2,454	Inactive
METROPOLITAN STATE HOSPITAL	NORWALK	2,400	Inactive
METROPOLITAN STATE HOSPITAL	NORWALK	2,400	Inactive
SOUTHERN CALIF WATER CO	LOS ANGELES	2,400	Inactive
PARK WATER CO NO 22-S GATE	DOWNEY	2,200	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	2,006	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	1,995	Inactive
KINNELOA IRRIGATION DIST.	PASADENA	1,960	Active
FRESNO COUNTY WATER WORKS	FRESNO	1,953	Inactive
FRESNO CO WATERWORKS DIST 21	FRESNO	1,800	Inactive
LANTERMAN DEVELOPMENTAL CENTER	POMONA	1,800	Inactive
LANTERMAN STATE HOSPITAL	POMONA	1,800	Inactive
FRESNO COUNTY WATER WORKS	—	1,799	Inactive
LAKE ELIZABETH MUTUAL WATER CO.	ELIZABETH LAKE	1,790	Active
FRESNO COUNTY WATER WORKS	FRESNO	1,680	Inactive
FRESNO CO WATERWORKS DIST 23	FRESNO	1,650	Inactive
LIBERTY UTILITIES - MESA CREST	DOWNEY	1,619	Active
PARK WATER CO SYSTEM 52	DOWNEY	1,592	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	1,519	Inactive
WHITE FENCE FARMS MWC NO. 1	PALMDALE	1,518	Active
PARK WATER CO	DOWNEY	1,512	Inactive
LYNWOOD PARK MUTUAL WATER CO.	COMPTON	1,500	Active
SUBURBAN WATER SYSTEMS-COVINA KNOLLS	COVINA	1,437	Active
CALIFORNIA WATER SERVICE CO.-LANCASTER	SAN JOSE	1,387	Active
PARK WATER CO	DOWNEY	1,350	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	1,341	Inactive
GREEN VALLEY CWD	GREEN VALLEY	1,275	Active
FRESNO COUNTY WATER WORKS	FRESNO	1,225	Inactive
RURBAN HOMES MUTUAL WATER CO.	EL MONTE	1,200	Inactive
BELLFLOWER HOME GARDEN WATER COMPANY	BELLFLOWER	1,129	Active
WESMILTON WTR SYSTEM	FRESNO	1,060	Inactive
SUNDALE MUTUAL WATER COMPANY A, B	LANCASTER	1,050	Active
AVERYDALE MWC	LANCASTER	1,023	Active
LOS ANGELES CWWD 40, REG. 39-ROCK CREEK	ALHAMBRA	994	Active
FRESNO COUNTY WATER WORKS	FRESNO	977	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	959	Inactive
CALIFORNIA WATER SERVICE CO-LAKE HUGHES	SAN JOSE	929	Active
ROCKWELL INTERNATIONAL CORP	CANOGA PARK	900	Inactive
SO CALIF W CO-GOLDEN WEST GAR	LOS ANGELES	899	Inactive
SOUTHERN CALIF WATER CO	LOS ANGELES	879	Inactive
CALIFORNIA WATER SERVICE CO-LEONA VALLEY	SAN JOSE	878	Active
PARK WATER CO	DOWNEY	816	Inactive
WEST VALLEY COUNTY WATER DISTRICT	SACRAMENTO	798	Active
COUNTY WATER COMPANY	LAKEWOOD	780	Inactive
FRESNO COUNTY WATER WORKS	FRESNO	774	Inactive
VAN DIEST WATER COMPANY	PARAMOUNT	750	Inactive
WHITE FENCE FARMS MWC NO.3	LANCASTER	749	Active
LOS ANGELES CWWD 21-KAGEL CANYON	ALHAMBRA	708	Active
DEL RIO MUTUAL	EL MONTE	700	Active
HEMLOCK MUTUAL WATER CO.	EL MONTE	686	Active
EL DORADO MUTUAL WATER CO.	PALMDALE	660	Active
LILY OF THE VALLEY MOBILE VILLAGE	SAUGUS	657	Active
HEMLOCK MUTUAL WATER COMPANY	EL MONTE	636	Inactive
LOS ANGELES CWWD 40, REG. 35-N.E. L.A.	ALHAMBRA	612	Active
MIDWAY GARDENS MUTUAL WATER CO	PARAMOUNT	560	Inactive
LANDALE MUTUAL WATER COMPANY	LANCASTER	550	Active
LLANO DEL RIO WATER COMPANY	LLANO	545	Active
SHERWOOD MOBILE HOME PARK	LANCASTER	540	Active

Showing the 200 largest of 332 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.