All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Morro Bay PW Dept Water Division San Luis Obispo County |
10,757 | 0 | 0 | |
|
Del Oro Water Co.-Paradise Pines Butte County |
10,738 | 0 | 0 | |
|
Lawrence Livermore National Lab Site 200 Livermore · Alameda County |
10,735 | 0 | 0 | |
|
Table Mountain Rancheria Table Mountain · County |
10,675 | 0 | 0 | |
|
California Institution for Men San Bernardino County |
10,667 | 1 | 1 | |
|
California Water Service Co. Dixon Solano County |
10,623 | 0 | 0 | |
|
Sonoma, City of Sonoma · Sonoma County |
10,619 | 1 | 1 | |
|
City of Shasta Lake Shasta Lake 451 · Shasta County |
10,371 | 0 | 0 | |
|
South Mesa WC Riverside County |
10,348 | 0 | 0 | |
|
Riverstone/rootcreek Water District Madera · Madera County |
10,276 | 1 | 1 | |
|
Farmersville, City of Farmersville · Tulare County |
10,243 | 1 | 1 | |
|
Shasta District Fair Shasta County |
10,200 | 1 | 0 | |
|
Graton Resort and Casino County |
10,127 | 0 | 0 | |
|
Valley Water Co. Los Angeles County |
10,113 | 0 | 0 | |
|
Scwa Arden Park Vista Sacramento County |
10,068 | 1 | 1 | |
|
Anza Valley Business Riverside County |
10,014 | 1 | 0 | |
|
New 99 Speedway Water System San Joaquin County |
10,000 | 0 | 0 | |
|
Cal-Am Water Company East Pasadena Los Angeles County |
9,963 | 0 | 0 | |
|
Ccwd Jenny Lind Calaveras County |
9,861 | 0 | 0 | |
|
Golden Hills Csd Kern County |
9,857 | 0 | 0 | |
|
Winton Water & Sanitary Dist Merced County |
9,745 | 1 | 1 | |
|
Blythe City of Blythe · Riverside County |
9,735 | 0 | 0 | |
|
City of Live Oak Live Oak · Sutter County |
9,687 | 0 | 0 | |
|
Viejas Community System Alpine · County |
9,600 | 1 | 0 | |
|
Anza Community Hall Riverside County |
9,595 | 0 | 0 | |
|
Cal AM West Placer Placer County |
9,547 | 0 | 0 | |
|
City of Orange Cove Orange Cove · Fresno County |
9,525 | 1 | 1 | |
|
Hard Rock Fire Mountain Water System County |
9,500 | 0 | 0 | |
|
Myoma Dunes Mutual Water Company Riverside County |
9,445 | 0 | 0 | |
|
Georgetown Divide Pud El Dorado County |
9,434 | 1 | 0 | |
|
LA Canada Irrigation Dist. Los Angeles County |
9,258 | 0 | 0 | |
|
Placerville, City of Main El Dorado County |
9,224 | 0 | 0 | |
|
Paradise Irrigation District Butte County |
9,114 | 0 | 0 | |
|
Nevada ID Lake Wildwood Nevada County |
9,108 | 0 | 0 | |
|
Tehachapi, City of Tehachapi · Kern County |
9,094 | 2 | 1 | |
|
Ebrpd del Valle Regional Park Alameda County |
9,024 | 0 | 0 | |
|
Brecon Estate San Simeon · San Luis Obispo County |
9,012 | 0 | 0 | |
|
33rd District Agricultural Association San Benito County |
9,000 | 0 | 0 | |
|
Sacramento International Airport [sws] Sacramento County |
9,000 | 0 | 0 | |
|
Santa Rosa Tachi Palace Santa Rosa Rancheria · County |
9,000 | 0 | 0 | |
|
Clear Creek Csd-Anderson Shasta County |
8,900 | 0 | 0 | |
|
Guadalupe Water Department Santa Barbara County |
8,897 | 0 | 0 | |
|
Awa Buckhorn Plant Amador County |
8,791 | 0 | 0 | |
|
City of Waterford Modesto · Stanislaus County |
8,788 | 0 | 0 | |
|
Lincoln Avenue Water Co. Los Angeles County |
8,721 | 0 | 0 | |
|
Cloverdale, City of Cloverdale · Sonoma County |
8,710 | 1 | 1 | |
|
Tract 349 Mutual Water Co. Los Angeles County |
8,700 | 0 | 0 | |
|
Firebaugh City Firebaugh · Fresno County |
8,424 | 0 | 0 | |
|
Gonzales, City of Gonzales · Monterey County |
8,333 | 1 | 0 | |
|
Orosi Public Utility District Tulare County |
8,300 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.