U.S. water systems

California Water Systems

California

5,976 community water systems on record — 2,812 active, 3,164 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.

Counties in California

Alameda County (20)Alpine County (5)Amador County (41)Butte County (68)Calaveras County (29)Colusa County (11)Contra Costa County (63)Del Norte County (27)El Dorado County (48)Fresno County (210)Glenn County (17)Humboldt County (92)Imperial County (51)Inyo County (55)Kern County (282)Kings County (31)Lake County (108)Lassen County (24)Los Angeles County (332)Madera County (85)Marin County (33)Mariposa County (36)Mendocino County (81)Merced County (53)Modoc County (20)Mono County (23)Monterey County (355)Napa County (62)Nevada County (42)Orange County (116)Placer County (114)Plumas County (45)Riverside County (227)Sacramento County (190)San Benito County (56)San Bernardino County (242)San Diego County (133)San Francisco County (13)San Joaquin County (141)San Luis Obispo County (94)San Mateo County (60)Santa Barbara County (82)Santa Clara County (144)Santa Cruz County (101)Shasta County (83)Sierra County (10)Siskiyou County (66)Solano County (38)Sonoma County (221)Stanislaus County (128)Sutter County (49)Tehama County (66)Trinity County (78)Tulare County (223)Tuolumne County (103)Ventura County (106)Yolo County (48)Yuba County (43)

All community water systems in California

System name	Mailing city	Population served	Status
LOS ANGELES-CITY, DEPT. OF WATER & POWER	LOS ANGELES	3,875,566	Active
EAST BAY MUD	OAKLAND	1,442,800	Active
SAN DIEGO, CITY OF	SAN DIEGO	1,385,379	Active
SAN JOSE WATER	SAN JOSE	1,039,920	Active
SFPUC CITY DISTRIBUTION DIVISION	BURLINGAME	848,019	Active
EASTERN MUNICIPAL WD	PERRIS	666,581	Active
CITY OF FRESNO	FRESNO	545,716	Active
CITY OF SACRAMENTO MAIN	SACRAMENTO	527,979	Active
LONG BEACH UTILITIES DEPARTMENT	LONG BEACH	466,772	Active
IRVINE RANCH WATER DISTRICT	IRVINE	444,800	Active
CITY OF ANAHEIM	ANAHEIM	348,593	Active
ALAMEDA COUNTY WATER DISTRICT	FREMONT	344,000	Active
CITY OF SANTA ANA	SANTA ANA	310,539	Active
SACRAMENTO CITY-DIV WTR & SWR	SACRAMENTO	310,000	Inactive
CHINO BASIN MWD	RANCHO CUCAMONGA	300,000	Inactive
RIVERSIDE, CITY OF	RIVERSIDE	298,398	Active
SANTA CLARITA VALLEY WATER AGENCY	NEWHALL	294,090	Active
GSWC - SOUTHWEST	HAWTHORNE	277,740	Active
HELIX WATER DISTRICT	LA MESA	277,668	Active
COACHELLA VWD: COVE COMMUNITY	PALM DESERT	270,000	Active
CWS - BAKERSFIELD	SAN JOSE	267,881	Active
SAN GABRIEL VALLEY WATER CO.-EL MONTE	EL MONTE	248,000	Active
OTAY WATER DISTRICT	SPRING VALLEY	238,008	Active
SAN GABRIEL VALLEY WC - FONTANA	FONTANA	237,700	Active
MODESTO, CITY OF	MODESTO	218,771	Active
SAN BERNARDINO CITY	SAN BERNARDINO	214,665	Active
CUCAMONGA VALLEY WATER DISTRICT	RANCHO CUCUAMONGA	211,069	Active
LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER	ALHAMBRA	208,129	Active
CITY OF HUNTINGTON BEACH	HUNTINGTON BEACH	201,000	Active
OXNARD WATER DEPT	OXNARD	200,232	Active
CONTRA COSTA WATER DISTRICT	CONCORD	198,000	Active
SACRAMENTO SUBURBAN WATER DISTRICT	SACRAMENTO	194,444	Active
CITY OF STOCKTON	STOCKTON	191,302	Active
SWEETWATER AUTHORITY	CHULA VISTA	191,282	Active
GLENDALE-CITY, WATER DEPT.	GLENDALE	188,784	Active
MARIN MUNICIPAL WATER DISTRICT	CORTE MADERA	186,895	Active
ONTARIO MUNICIPAL UTILITIES COMPANY	ONTARIO	185,010	Active
SCWA - LAGUNA/VINEYARD	SACRAMENTO	184,896	Active
CALIFORNIA WATER SERVICE - STOCKTON	SAN JOSE	176,266	Active
SANTA ROSA, CITY OF	SANTA ROSA	175,396	Active
CITY OF GARDEN GROVE	GARDEN GROVE	174,226	Active
OCEANSIDE, CITY OF	OCEANSIDE	171,483	Active
MOULTON NIGUEL WATER DISTRICT	LAGUNA HILLS	170,236	Active
ELSINORE VALLEY MWD	LAKE ELSINORE	169,455	Active
SUBURBAN WATER SYSTEMS-SAN JOSE	COVINA	168,843	Active
CORONA, CITY OF	CORONA	168,575	Active
SANTA MARGARITA WATER DISTRICT	RANCHO SANTA MARGARITA	168,289	Active
PASADENA WATER AND POWER	PASADENA	164,344	Active
CITY OF HAYWARD	HAYWARD	162,954	Active
BAKERSFIELD, CITY OF	SAN JOSE	160,144	Active
CITY OF SUNNYVALE	SUNNYVALE	157,566	Active
CITY OF ROSEVILLE	ROSEVILLE	155,612	Active
CALIFORNIA WATER SERVICE CO. - ELA	SAN JOSE	152,474	Active
POMONA - CITY, WATER DEPT.	POMONA	151,713	Active
CWS - VISALIA	SAN JOSE	148,496	Active
RANCHO CALIFORNIA WATER DISTRICT	TEMECULA	146,147	Active
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ	SAN JOSE	143,996	Active
CITY OF FULLERTON	FULLERTON	139,461	Active
ESCONDIDO, CITY OF	ESCONDIDO	137,044	Active
VICTORVILLE WATER DISTRICT	VICTORVILLE	135,983	Active
SANTA CLARITA VALLEY W.A.-SANTA CLARITA	NEWHALL	135,281	Inactive
JURUPA COMMUNITY SD	JURUPA VALLEY	135,093	Active
VISTA IRRIGATION DISTRICT	VISTA	132,430	Active
EL DORADO ID - MAIN	PLACERVILLE	132,171	Active
CITY OF SANTA CLARA	SANTA CLARA	130,746	Active
CITY OF CLOVIS	CLOVIS	130,130	Active
PALMDALE WATER DIST.	PALMDALE	126,804	Active
CWSC SALINAS	SAN JOSE	123,679	Active
CITY OF VALLEJO	VALLEJO	121,420	Active
CITY OF ORANGE	ORANGE	120,770	Active
CITY OF FAIRFIELD	FAIRFIELD	120,377	Active
CITY OF ANTIOCH	ANTIOCH	115,074	Active
CAL-WATER SERVICE CO.-CHICO	SAN JOSE	114,925	Active
GOLDEN STATE WC - WEST ORANGE COUNTY	ANAHEIM	114,379	Active
VALLECITOS WD	SAN MARCOS	113,500	Active
VENTURA WATER DEPARTMENT	VENTURA	113,500	Active
DOWNEY - CITY, WATER DEPT.	DOWNEY	110,556	Active
GREAT OAKS WC INC	SAN JOSE	110,088	Active
AZUSA LIGHT AND WATER	AZUSA	110,044	Active
MESA WATER DISTRICT	COSTA MESA	110,000	Active
SAN BERNARDINO VALLEY WD	SAN BERNARDINO	109,608	Active
CITY OF SANTA MARIA UTILITIES DEPARTMENT	SANTA MARIA	109,477	Active
EAST VALLEY WATER DISTRICT	HIGHLAND	108,629	Active
TORRANCE-CITY, WATER DEPT.	TORRANCE	106,183	Active
CAL-AM WATER CORONADO	IMPERIAL BEACH	106,000	Active
BURBANK-CITY, WATER DEPT.	BURBANK	105,603	Active
CITY OF DALY CITY	DALY CITY	104,901	Active
WEST VALLEY WATER DISTRICT	RIALTO	104,498	Active
CALIFORNIA WATER SERVICE - SAN MATEO	SAN JOSE	102,348	Active
CITY OF SAN JOSE - EVG/EDV/COY	SAN JOSE	101,265	Active
WALNUT VALLEY WATER DISTRICT	WALNUT	100,941	Active
HESPERIA WD	HESPERIA	100,744	Active
SOUTH TAHOE PUD - MAIN	SOUTH LAKE TAHOE	100,000	Active
CITY OF VACAVILLE	ELMIRA	99,650	Active
CITY OF SANTA BARBARA WATER DEPARTMENT	SANTA BARBARA	99,323	Active
DUBLIN SAN RAMON SERVICES DISTRICT	PLEASANTON	98,776	Active
CALIFORNIA WATER SERVICE CO. - HERM/REDO	SAN JOSE	96,853	Active
TRACY, CITY OF	TRACY	96,609	Active
CARLSBAD MWD	CARLSBAD	95,158	Active
VENTURA WWD NO. 8 - SIMI VALLEY	SIMI VALLEY	94,738	Active
SANTA CRUZ WATER DEPARTMENT	SANTA CRUZ	94,626	Active
PADRE DAM MWD	SANTEE	93,980	Active
CITY OF MERCED	MERCED	93,692	Active
CITY OF REDWOOD CITY	REDWOOD CITY	92,819	Active
CAL AM WATER COMPANY - MONTEREY	PACIFIC GROVE	92,450	Active
CITY OF WESTMINSTER	WESTMINSTER	90,911	Active
SANTA MONICA-CITY, WATER DIVISION	LOS ANGELES	89,947	Active
CITY OF REDDING	REDDING	89,628	Active
PLACER CWA - FOOTHILL	AUBURN	89,544	Active
OLIVENHAIN MWD	ENCINITAS	86,458	Active
CHINO, CITY OF	CHINO	86,435	Active
WESTERN MWD	RIVERSIDE	86,062	Active
MANTECA, CITY OF	MANTECA	84,928	Active
NAPA, CITY OF	NAPA	84,804	Active
INDIO WATER AUTHORITY	INDIO	84,757	Active
GOLETA WATER DISTRICT	GOLETA	84,462	Active
YORBA LINDA WATER DISTRICT	PLACENTIA	84,292	Active
CITY OF BUENA PARK	BUENA PARK	81,998	Active
CITY OF MILPITAS	MILPITAS	81,773	Active
CITY OF MOUNTAIN VIEW	MOUNTAIN VIEW	81,501	Active
FOLSOM, CITY OF - MAIN	FOLSOM	80,969	Active
INGLEWOOD- CITY, WATER DEPT.	INGLEWOOD	80,824	Active
CITY OF ALHAMBRA	ALHAMBRA	79,776	Active
UPLAND, CITY OF	UPLAND	78,376	Active
REDLANDS CITY MUD-WATER DIV	REDLANDS	78,025	Active
CITY OF PLEASANTON	PLEASANTON	76,689	Active
SOUTH GATE-CITY, WATER DEPT.	SOUTH GATE	76,443	Active
CHINO HILLS, CITY OF	CHINO HILLS	76,414	Active
COMPTON-CITY, WATER DEPT.	COMPTON	74,877	Active
DESERT WATER AGENCY	PALM SPRINGS	74,807	Active
TURLOCK, CITY OF	TURLOCK	72,682	Active
LIBERTY UTILITIES - BELLFLOWER-NORWALK	DOWNEY	72,624	Active
LAS VIRGENES MWD	CALABASAS	72,602	Active
TULARE, CITY OF	TULARE	72,241	Active
CALIFORNIA WATER SERVICE CO. - PALOS VER	SAN JOSE	71,452	Active
CITY OF YUBA CITY	YUBA CITY	70,256	Active
CWSC LOS ALTOS SUBURBAN	SAN JOSE	69,973	Active
VALLEY COUNTY WATER DIST.	BALDWIN PARK	68,871	Active
CITY OF NEWPORT BEACH	NEWPORT BEACH	68,572	Active
LODI, CITY OF	LODI	68,272	Active
CITRUS HEIGHTS WATER DISTRICT	CITRUS HEIGHTS	67,818	Active
CITY OF DAVIS	DAVIS	67,457	Active
CITY OF PALO ALTO	PALO ALTO	67,231	Active
LYNWOOD-CITY, WATER DEPT.	LYNWOOD	66,967	Active
BEAUMONT CHERRY VALLEY WD	BEAUMONT	66,841	Active
CAL AMERICAN WATER CO	ROSEMEAD	66,809	Active
CITY OF TUSTIN	TUSTIN	66,600	Active
CITY OF MADERA	MADERA	66,560	Active
LAKEWOOD - CITY, WATER DEPT.	LAKEWOOD	66,135	Active
SUBURBAN WATER SYSTEMS-WHITTIER	COVINA	66,045	Active
WATSONVILLE, CITY OF	WATSONVILLE	65,231	Active
BRENTWOOD	BRENTWOOD	64,513	Active
LIBERTY UTILITIES (AV RANCHOS) CORP.	DOWNEY	64,469	Active
CALIFORNIA WATER SERVICE-S SAN FRANCISCO	SAN JOSE	64,146	Active
PORTERVILLE, CITY OF	PORTERVILLE	63,487	Active
GSWC - FLORENCE/GRAHAM	ANAHEIM	63,472	Active
CITY OF LA HABRA	LA HABRA	63,118	Active
CITY OF PITTSBURG	PITTSBURG	62,500	Active
MONTEREY PARK-CITY, WATER DEPT.	MONTEREY PARK	62,183	Active
HANFORD, CITY OF	HANFORD	62,127	Active
NORTH MARIN WATER DISTRICT	NOVATO	61,691	Active
CITY OF WOODLAND	WOODLAND	61,462	Active
CALIFORNIA WATER SERVICE - BEAR GULCH	SAN JOSE	61,431	Active
PETALUMA, CITY OF	PETALUMA	60,781	Active
CALIFORNIA WATER SERVICE - LIVERMORE	SAN JOSE	60,414	Active
CITY OF GILROY	GILROY	59,203	Active
SUBURBAN WATER SYSTEMS-LA MIRADA	COVINA	56,793	Active
CITY OF FOUNTAIN VALLEY	FOUNTAIN VALLEY	56,747	Active
GSWC-SAN DIMAS	SAN DIMAS	56,538	Active
ALCO WATER SERVICE	SALINAS	56,253	Active
ROWLAND WATER DISTRICT	ROWLAND HEIGHTS	56,100	Active
MONTE VISTA WD	MONTCLAIR	56,017	Active
PARAMOUNT - CITY, WATER DEPT.	PARAMOUNT	55,200	Active
GSWC - BELL, BELL GARDENS	ANAHEIM	55,050	Active
CAL AM - SUBURBAN ROSEMONT	SACRAMENTO	54,793	Active
CITY OF LINCOLN	LINCOLN	54,538	Active
CERES, CITY OF	CERES	54,513	Active
RIALTO, CITY OF	RIALTO	54,453	Active
CITY OF WEST SACRAMENTO	WEST SACRAMENTO	53,355	Active
CITY OF THOUSAND OAKS WATER DEPARTMENT	THOUSAND OAKS	53,157	Active
LAKE HEMET MWD	HEMET	52,913	Active
YUCAIPA VALLEY WATER DISTRICT	YUCAIPA	52,010	Active
EL TORO WATER DISTRICT	LAKE FOREST	51,800	Active
CITY OF SAN CLEMENTE	SAN CLEMENTE	51,545	Active
DELANO, CITY OF	DELANO	51,428	Active
CITY OF ARCADIA	ARCADIA	51,361	Active
CAL AM - PARKWAY	SACRAMENTO	50,573	Active
GSWC - ARTESIA	ANAHEIM	50,415	Active
GOLDEN STATE WC - PLACENTIA/YORBA LINDA	ANAHEIM	50,381	Active
WHITTIER-CITY, WATER DEPT.	WHITTIER	49,954	Active
GLENDORA-CITY, WATER DEPT.	GLENDORA	49,934	Active
POWAY, CITY OF	POWAY	49,888	Active
UC - DAVIS	DAVIS	49,616	Active
CITY OF BREA	BREA	48,479	Active
CAL AM - LINCOLN OAKS	SACRAMENTO	48,094	Active
CAL/AM WATER COMPANY - SAN MARINO	ROSEMEAD	47,995	Active
LAGUNA HILLS WATER CO	LAGUNA HILLS	47,842	Inactive
SAN LUIS OBISPO WATER DEPARTMENT	SAN LUIS OBISPO	47,788	Active
CERRITOS - CITY, WATER DEPT.	CERRITOS	47,475	Active
CITY OF LOS BANOS	LOS BANOS	47,419	Active

Showing the 200 largest of 5,976 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.