All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Byron Airport Contra Costa County |
35 | 0 | 0 | |
|
Caltrans-Cottonwood Truck Insp. Fac. Tehama County |
35 | 0 | 0 | |
|
Camp Owen Water System Kern County |
35 | 0 | 0 | |
|
Cantina Water System Madera County |
35 | 1 | 0 | |
|
Canyon Creek MHP Shasta County |
35 | 0 | 0 | |
|
Caples Lake CG Alpine County |
35 | 0 | 0 | |
|
Caspar Beach RV Park Mendocino County |
35 | 0 | 0 | |
|
Christian Encounter Ministries Nevada County |
35 | 0 | 0 | |
|
Country Mart Diesel & Gas Water Sys San Joaquin County |
35 | 0 | 0 | |
|
Cold Springs Subdivision Cold Springs Rancheria · County |
35 | 8 | 3 | |
|
Deerfield Ranch Winery LLC Sonoma County |
35 | 0 | 0 | |
|
Deetjen's Big Sur Inn WS Monterey County |
35 | 2 | 1 | |
|
Duro Water System County |
35 | 0 | 0 | |
|
Eighth Street East Partners Sonoma County |
35 | 0 | 0 | |
|
Feather River Manor Yuba County |
35 | 1 | 1 | |
|
First Mutual Water System Kern County |
35 | 1 | 0 | |
|
Flournoy School Tehama County |
35 | 1 | 1 | |
|
Gleanings for the Hungry Tulare County |
35 | 4 | 1 | |
|
Guadalupe Cooling Company San Luis Obispo County |
35 | 1 | 0 | |
|
Helendale Csd Community Center San Bernardino County |
35 | 0 | 0 | |
|
Hitchcock RD WS #01 Monterey County |
35 | 0 | 0 | |
|
Hook & Ladder Vineyards and Winery Sonoma County |
35 | 0 | 0 | |
|
Hunnicutt Winery Napa County |
35 | 0 | 0 | |
|
Indian Village County |
35 | 7 | 2 | |
|
Jimtown and Then Sum Sonoma County |
35 | 0 | 0 | |
|
Lake Sabrina Boat Landing Inyo County |
35 | 0 | 0 | |
|
Lee's Orchard Owners Association Santa Clara · Santa Clara County |
35 | 0 | 0 | |
|
Life Water Co-Op Kern County |
35 | 0 | 0 | |
|
Linda Falls Terrace Mutual Napa County |
35 | 0 | 0 | |
|
M & L Office Delano · Kern County |
35 | 0 | 0 | |
|
Mact Health Board, Inc. Calaveras County |
35 | 0 | 0 | |
|
McPr Woodland Park Mariposa County |
35 | 0 | 0 | |
|
Mks Applegate Placer County |
35 | 0 | 0 | |
|
Mount Toro Ranchos Mwa Monterey County |
35 | 0 | 0 | |
|
Natividad RD WS #02 Monterey County |
35 | 1 | 1 | |
|
Natomas Golf Center Sacramento County |
35 | 1 | 0 | |
|
North Valley School PWS San Joaquin County |
35 | 0 | 0 | |
|
Nps Death Valley, Mesquite Springs Inyo County |
35 | 0 | 0 | |
|
Ocotillo Chevron Station Imperial County |
35 | 0 | 0 | |
|
Odiyan Buddhist Retreat Center Sonoma County |
35 | 0 | 0 | |
|
Oku Incorporated San Mateo County |
35 | 3 | 2 | |
|
Olympia Park Water System Nevada County |
35 | 0 | 0 | |
|
Outlook WA Monterey County |
35 | 0 | 0 | |
|
Ovid Napa Valley St. Helena · Napa County |
35 | 0 | 0 | |
|
Paradise Ridge Winery Sonoma County |
35 | 0 | 0 | |
|
Parsons Water Supply San Luis Obispo County |
35 | 0 | 0 | |
|
Partington Mwc Monterey County |
35 | 0 | 0 | |
|
Pepperwood Environmental Center Sonoma County |
35 | 0 | 0 | |
|
Playa Dulce San Luis Obispo County |
35 | 0 | 0 | |
|
Prunedale Chevron WS Monterey County |
35 | 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.