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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.

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System Name PWSID State Type Population Served
CARLSBAD MWD CA3710005 California Community 95,158
VENTURA WWD NO. 8 - SIMI VALLEY CA5610023 California Community 94,738
SANTA CRUZ WATER DEPARTMENT CA4410010 California Community 94,626
PADRE DAM MWD CA3710037 California Community 93,859
CITY OF MERCED CA2410009 California Community 93,692
MILLERTON LAKE SOUTH SHORE CA1010301 California Non-Transient Non-Community 93,204
CITY OF REDWOOD CITY CA4110022 California Community 92,819
CAL AM WATER COMPANY - MONTEREY CA2710004 California Community 92,450
ANZA COMMUNITY HALL CA3301797 California Transient Non-Community 92,019
CITY OF WESTMINSTER CA3010064 California Community 90,911
SANTA MONICA-CITY, WATER DIVISION CA1910146 California Community 89,947
CITY OF REDDING CA4510005 California Community 89,628
PLACER CWA - FOOTHILL CA3110025 California Community 89,544
OLIVENHAIN MWD CA3710029 California Community 86,458
CHINO, CITY OF CA3610012 California Community 86,435
WESTERN MWD CA3310049 California Community 86,062
MANTECA, CITY OF CA3910005 California Community 84,928
NAPA, CITY OF CA2810003 California Community 84,804
INDIO WATER AUTHORITY CA3310020 California Community 84,757
GOLETA WATER DISTRICT CA4210004 California Community 84,462
YORBA LINDA WATER DISTRICT CA3010037 California Community 84,292
CITY OF BUENA PARK CA3010003 California Community 81,998
CITY OF MILPITAS CA4310005 California Community 81,773
CITY OF MOUNTAIN VIEW CA4310007 California Community 81,501
BIG BEAR ADMINISTRATION CA3601150 California Non-Transient Non-Community 81,075
FOLSOM, CITY OF - MAIN CA3410014 California Community 80,969
INGLEWOOD- CITY, WATER DEPT. CA1910051 California Community 80,824
CITY OF ALHAMBRA CA1910001 California Community 79,776
UPLAND, CITY OF CA3610050 California Community 78,376
REDLANDS CITY MUD-WATER DIV CA3610037 California Community 78,025
CITY OF PLEASANTON CA0110008 California Community 76,689
SOUTH GATE-CITY, WATER DEPT. CA1910152 California Community 76,443
CHINO HILLS, CITY OF CA3610036 California Community 76,414
SNOW SUMMIT CA3600707 California Non-Transient Non-Community 75,500
COMPTON-CITY, WATER DEPT. CA1910026 California Community 74,877
DESERT WATER AGENCY CA3310005 California Community 74,807
TURLOCK, CITY OF CA5010019 California Community 72,682
LIBERTY UTILITIES - BELLFLOWER-NORWALK CA1910211 California Community 72,624
LAS VIRGENES MWD CA1910225 California Community 72,602
TULARE, CITY OF CA5410015 California Community 72,131
CALIFORNIA WATER SERVICE CO. - PALOS VER CA1910104 California Community 71,452
CITY OF YUBA CITY CA5110002 California Community 70,256
CWSC LOS ALTOS SUBURBAN CA4310001 California Community 69,973
VALLEY COUNTY WATER DIST. CA1910009 California Community 68,871
CITY OF NEWPORT BEACH CA3010023 California Community 68,572
LODI, CITY OF CA3910004 California Community 68,272
CITRUS HEIGHTS WATER DISTRICT CA3410006 California Community 67,818
CITY OF DAVIS CA5710001 California Community 67,457
CITY OF PALO ALTO CA4310009 California Community 67,231
LYNWOOD-CITY, WATER DEPT. CA1910079 California Community 66,967