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 |
|---|---|---|---|---|
| GLENDORA-CITY, WATER DEPT. | CA1910044 | California | Community | 49,934 |
| POWAY, CITY OF | CA3710015 | California | Community | 49,888 |
| UC - DAVIS | CA5710009 | California | Community | 49,616 |
| CITY OF BREA | CA3010002 | California | Community | 48,479 |
| CAL AM - LINCOLN OAKS | CA3410013 | California | Community | 48,094 |
| CAL/AM WATER COMPANY - SAN MARINO | CA1910139 | California | Community | 47,995 |
| LAGUNA HILLS WATER CO | CA3010009 | California | Community | 47,842 |
| SAN LUIS OBISPO WATER DEPARTMENT | CA4010009 | California | Community | 47,788 |
| CERRITOS - CITY, WATER DEPT. | CA1910019 | California | Community | 47,475 |
| CITY OF LOS BANOS | CA2410005 | California | Community | 47,419 |
| CITY OF MORGAN HILL | CA4310006 | California | Community | 47,374 |
| GOLDEN STATE WATER CO. - CORDOVA | CA3410015 | California | Community | 47,161 |
| CAMARILLO WATER DEPT | CA5610019 | California | Community | 46,824 |
| COLTON, CITY OF | CA3610014 | California | Community | 46,525 |
| BELLFLOWER - SOMERSET MWC | CA1910013 | California | Community | 46,300 |
| CITY OF SAN JOSE - NSJ/ALVISO | CA4310019 | California | Community | 45,559 |
| GOLDEN STATE WATER COMPANY - SIMI VALLEY | CA5610059 | California | Community | 45,128 |
| OILDALE MWC | CA1510015 | California | Community | 44,899 |
| HAWTHORNE-CITY WATER DEPT. | CA1910047 | California | Community | 44,718 |
| ROHNERT PARK, CITY OF | CA4910014 | California | Community | 43,821 |
| ELK GROVE WATER DISTRICT | CA3410008 | California | Community | 43,813 |
| EL CENTRO, CITY OF | CA1310004 | California | Community | 43,772 |
| COACHELLA WATER AUTHORITY | CA3310007 | California | Community | 43,590 |
| MISSION SPRINGS WD | CA3310008 | California | Community | 43,484 |
| DIABLO WATER DISTRICT | CA0710007 | California | Community | 43,357 |
| GSWC - NORWALK | CA1910098 | California | Community | 43,176 |
| CAMP PENDLETON (SOUTH) | CA3710702 | California | Community | 42,219 |
| SACRAMENTO INTERNATIONAL AIRPORT [SWS] | CA3400139 | California | Non-Transient Non-Community | 41,717 |
| INDIAN WELLS VALLEY W.D. | CA1510017 | California | Community | 41,580 |
| WESTERN MWD | CA1310049 | California | Community | 41,549 |
| CITY OF SAN BRUNO | CA4110023 | California | Community | 41,327 |
| CARMICHAEL WATER DISTRICT | CA3410004 | California | Community | 41,193 |
| SOUTH COAST WATER DISTRICT | CA3010042 | California | Community | 41,118 |
| CALIFORNIA STATE UNIVERSITY FRESNO | CA1010339 | California | Community | 41,000 |
| SOQUEL CREEK WATER DISTRICT | CA4410017 | California | Community | 40,809 |
| PICO RIVERA - CITY, WATER DEPT. | CA1910042 | California | Community | 40,600 |
| LOMPOC-CITY WATER UTILITY DIV | CA4210006 | California | Community | 40,473 |
| SAN DIEGUITO WD | CA3710021 | California | Community | 40,405 |
| CALEXICO, CITY OF | CA1310002 | California | Community | 40,357 |
| BEVERLY HILLS-CITY, WATER DEPT. | CA1910156 | California | Community | 40,121 |
| ADELANTO, CITY OF | CA3610001 | California | Community | 39,930 |
| GSWC - CLAREMONT | CA1910024 | California | Community | 39,730 |
| SANTA MARGARITA WATER DISTRICT-ID9 | CA3010030 | California | Community | 39,684 |
| SAN GABRIEL COUNTY WD | CA1910144 | California | Community | 39,345 |
| CITY OF LIVERMORE | CA0110011 | California | Community | 38,892 |
| NORTH COAST COUNTY WATER DIST | CA4110025 | California | Community | 38,546 |
| MARINA COAST WATER DISTRICT | CA2710017 | California | Community | 38,377 |
| GSWC - CULVER CITY | CA1910030 | California | Community | 38,213 |
| TEJON CASTAC WD - I5 & LAVAL RD | CA1503341 | California | Community | 38,125 |
| MONROVIA-CITY, WATER DEPT. | CA1910090 | California | Community | 37,931 |