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Browse Water Systems

20,002 public water systems in CA.

Public Water Systems Database

Browse 20,002 EPA-regulated public water systems with identifiers, population served, and water source type. Use the filters below to narrow results by state, system type, or name.

System Name PWSID State Type Population Served
GRIFFITH PARK CA1907037 California Transient Non-Community 9,000,000
LOS ANGELES-CITY, DEPT. OF WATER & POWER CA1910067 California Community 3,875,566
EAST BAY MUD CA0110005 California Community 1,442,800
SAN DIEGO, CITY OF CA3710020 California Community 1,385,379
SAN JOSE WATER CA4310011 California Community 1,039,920
SFPUC CITY DISTRIBUTION DIVISION CA3810011 California Community 848,019
EASTERN MUNICIPAL WD CA3310009 California Community 666,581
CITY OF FRESNO CA1010007 California Community 545,716
CITY OF SACRAMENTO MAIN CA3410020 California Community 520,407
LONG BEACH UTILITIES DEPARTMENT CA1910065 California Community 466,772
IRVINE RANCH WATER DISTRICT CA3010092 California Community 444,800
CITY OF ANAHEIM CA3010001 California Community 348,593
ALAMEDA COUNTY WATER DISTRICT CA0110001 California Community 344,000
CITY OF SANTA ANA CA3010038 California Community 310,539
SACRAMENTO CITY-DIV WTR & SWR CA3410044 California Community 310,000
CHINO BASIN MWD CA3610094 California Community 300,000
RIVERSIDE, CITY OF CA3310031 California Community 298,398
SANTA CLARITA VALLEY WATER AGENCY CA1910240 California Community 294,090
GSWC - SOUTHWEST CA1910155 California Community 277,740
HELIX WATER DISTRICT CA3710010 California Community 277,668
COACHELLA VWD: COVE COMMUNITY CA3310001 California Community 270,000
CWS - BAKERSFIELD CA1510003 California Community 267,881
SAN GABRIEL VALLEY WATER CO.-EL MONTE CA1910039 California Community 248,000
OTAY WATER DISTRICT CA3710034 California Community 238,008
SAN GABRIEL VALLEY WC - FONTANA CA3610041 California Community 237,700
MODESTO, CITY OF CA5010010 California Community 218,771
SAN BERNARDINO CITY CA3610039 California Community 214,665
CUCAMONGA VALLEY WATER DISTRICT CA3610018 California Community 211,069
LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER CA1910070 California Community 208,129
CITY OF HUNTINGTON BEACH CA3010053 California Community 201,000
OXNARD WATER DEPT CA5610007 California Community 200,232
CONTRA COSTA WATER DISTRICT CA0710003 California Community 198,000
SACRAMENTO SUBURBAN WATER DISTRICT CA3410001 California Community 194,444
CITY OF STOCKTON CA3910012 California Community 191,302
SWEETWATER AUTHORITY CA3710025 California Community 191,282
GLENDALE-CITY, WATER DEPT. CA1910043 California Community 188,784
MARIN MUNICIPAL WATER DISTRICT CA2110002 California Community 186,895
ONTARIO MUNICIPAL UTILITIES COMPANY CA3610034 California Community 185,010
SCWA - LAGUNA/VINEYARD CA3410029 California Community 184,896
SAN FRANCISCO INTERNATIONAL AIRPORT CA3810010 California Non-Transient Non-Community 183,386
CALIFORNIA WATER SERVICE - STOCKTON CA3910001 California Community 176,266
SANTA ROSA, CITY OF CA4910009 California Community 175,396
CITY OF GARDEN GROVE CA3010062 California Community 174,226
OCEANSIDE, CITY OF CA3710014 California Community 171,483
MOULTON NIGUEL WATER DISTRICT CA3010073 California Community 170,236
ELSINORE VALLEY MWD CA3310012 California Community 169,455
SUBURBAN WATER SYSTEMS-SAN JOSE CA1910205 California Community 168,843
CORONA, CITY OF CA3310037 California Community 168,575
SANTA MARGARITA WATER DISTRICT CA3010101 California Community 168,289
PASADENA WATER AND POWER CA1910124 California Community 164,344