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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
BEAUMONT CHERRY VALLEY WD CA3310002 California Community 66,841
CAL AMERICAN WATER CO CA5610040 California Community 66,809
CITY OF TUSTIN CA3010046 California Community 66,600
CITY OF MADERA CA2010002 California Community 66,560
LAKEWOOD - CITY, WATER DEPT. CA1910239 California Community 66,135
SUBURBAN WATER SYSTEMS-WHITTIER CA1910174 California Community 66,045
WATSONVILLE, CITY OF CA4410011 California Community 65,231
BRENTWOOD CA0710004 California Community 64,513
LIBERTY UTILITIES (AV RANCHOS) CORP. CA3610003 California Community 64,469
PARK MOABI CA3600193 California Non-Transient Non-Community 64,267
CALIFORNIA WATER SERVICE-S SAN FRANCISCO CA4110009 California Community 64,146
GSWC - FLORENCE/GRAHAM CA1910077 California Community 63,500
PORTERVILLE, CITY OF CA5410010 California Community 63,164
CITY OF LA HABRA CA3010018 California Community 63,118
CITY OF PITTSBURG CA0710008 California Community 62,500
MONTEREY PARK-CITY, WATER DEPT. CA1910092 California Community 62,183
HANFORD, CITY OF CA1610003 California Community 62,127
NORTH MARIN WATER DISTRICT CA2110003 California Community 61,691
CITY OF WOODLAND CA5710006 California Community 61,462
CALIFORNIA WATER SERVICE - BEAR GULCH CA4110006 California Community 61,431
PETALUMA, CITY OF CA4910006 California Community 60,781
CALIFORNIA WATER SERVICE - LIVERMORE CA0110003 California Community 60,414
CITY OF GILROY CA4310004 California Community 59,203
GOOSE CREEK GOLF CLUB CA3303072 California Non-Transient Non-Community 57,628
SUBURBAN WATER SYSTEMS-LA MIRADA CA1910059 California Community 56,793
CITY OF FOUNTAIN VALLEY CA3010069 California Community 56,747
GSWC-SAN DIMAS CA1910142 California Community 56,538
KERN COUNTY FAIRGROUNDS CA1502311 California Non-Transient Non-Community 56,300
ALCO WATER SERVICE CA2710001 California Community 56,253
MONTE VISTA WD CA3610029 California Community 56,017
PARAMOUNT - CITY, WATER DEPT. CA1910105 California Community 55,200
GSWC - BELL, BELL GARDENS CA1910011 California Community 54,877
CAL AM - SUBURBAN ROSEMONT CA3410010 California Community 54,793
ROWLAND WATER DISTRICT CA1910194 California Community 54,660
CITY OF LINCOLN CA3110004 California Community 54,538
CERES, CITY OF CA5010028 California Community 54,513
RIALTO, CITY OF CA3610038 California Community 54,453
CITY OF WEST SACRAMENTO CA5710003 California Community 53,355
CITY OF THOUSAND OAKS WATER DEPARTMENT CA5610020 California Community 53,157
LAKE HEMET MWD CA3310022 California Community 52,913
YUCAIPA VALLEY WATER DISTRICT CA3610055 California Community 52,010
EL TORO WATER DISTRICT CA3010079 California Community 51,800
CITY OF SAN CLEMENTE CA3010036 California Community 51,545
DELANO, CITY OF CA1510005 California Community 51,428
CITY OF ARCADIA CA1910003 California Community 51,361
CAL AM - PARKWAY CA3410017 California Community 50,573
GOLDEN STATE WC - PLACENTIA/YORBA LINDA CA3010035 California Community 50,381
GSWC - ARTESIA CA1910004 California Community 50,375
SANTA MARGARITA RECREATION AREA CA4000714 California Transient Non-Community 50,001
WHITTIER-CITY, WATER DEPT. CA1910173 California Community 49,954