All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ivanhoe Public Utility Dist Tulare County |
4,580 | 1 | 1 | |
|
Jacumba Chevron and Shell San Diego County |
4,520 | 0 | 0 | |
|
Jacumba Valley Ranch Water Company San Diego County |
4,520 | 1 | 0 | |
|
Golden State Water Company Nipomo San Luis Obispo County |
4,512 | 0 | 0 | |
|
Arrowhead Regional Medical Center San Bernardino County |
4,500 | 0 | 0 | |
|
Peppery Bar and Grill, the Tuolumne County |
4,500 | 1 | 0 | |
|
Slvwd Felton Water System Santa Cruz County |
4,491 | 2 | 1 | |
|
Northstar Csd Martis Valley Placer County |
4,432 | 0 | 0 | |
|
Suburban Water Systems Sativa Los Angeles County |
4,372 | 0 | 0 | |
|
Mt. Konocti Mutual Water Company Lake County |
4,360 | 0 | 0 | |
|
Correctional Training Facility Soledad Monterey County |
4,357 | 0 | 0 | |
|
Chuckawalla Valley State Prison Riverside County |
4,331 | 0 | 0 | |
|
Centerville C.s.d. Shasta County |
4,244 | 1 | 0 | |
|
Meadow Vista Cwd Placer County |
4,217 | 0 | 0 | |
|
Meiners Oaks Cwd Ventura County |
4,200 | 0 | 0 | |
|
Cal AM Arden Sacramento County |
4,178 | 0 | 0 | |
|
Planada Csd Merced County |
4,164 | 1 | 1 | |
|
Golden State Water CO Wrightwood San Bernardino County |
4,153 | 0 | 0 | |
|
Russian River County Water District Sonoma County |
4,150 | 0 | 0 | |
|
Armona Community Services Dist Kings County |
4,143 | 1 | 1 | |
|
City of Wheatland Wheatland · Yuba County |
4,124 | 0 | 0 | |
|
Kelseyville CO Waterworks District 3 Lake County |
4,102 | 0 | 0 | |
|
Centinela State Prison Imperial County |
4,100 | 0 | 0 | |
|
San Joaquin, City of San Joaquin · Fresno County |
4,060 | 0 | 0 | |
|
Lake County Csa 21 North Lakeport Lake County |
4,046 | 0 | 0 | |
|
Farm Mutual W.c. (the) Riverside County |
4,026 | 1 | 0 | |
|
Camp Far West Resort Yuba County |
4,012 | 0 | 0 | |
|
Sheep Creek Water Company San Bernardino County |
4,002 | 1 | 0 | |
|
Mataguay Scout Reservation San Diego County |
4,000 | 1 | 0 | |
|
Yosemite Nps-Glacier Point Mariposa County |
4,000 | 0 | 0 | |
|
Weaverville C.s.d. Trinity County |
3,975 | 1 | 0 | |
|
Del Mar, City of Del Mar · San Diego County |
3,950 | 0 | 0 | |
|
Bighorn Desert View Water Agency San Bernardino County |
3,916 | 0 | 0 | |
|
California State Prison Solano Solano County |
3,882 | 0 | 0 | |
|
Treasure Island San Francisco County |
3,864 | 0 | 0 | |
|
Woodlands Development San Luis Obispo County |
3,862 | 0 | 0 | |
|
Cdcr-High Desert State Prison Lassen County |
3,857 | 0 | 0 | |
|
Maywood Mutual Water Co. #1 Los Angeles County |
3,851 | 0 | 0 | |
|
Angels, City of Angels Camp · Calaveras County |
3,836 | 1 | 0 | |
|
So. Cal. Edison Co.-Santa Catalina Los Angeles County |
3,822 | 0 | 0 | |
|
Bishop, City of Bishop · Inyo County |
3,819 | 1 | 0 | |
|
San Joaquin County-Mokelumne Acres San Joaquin County |
3,802 | 0 | 0 | |
|
Willow County Water District Mendocino County |
3,797 | 1 | 0 | |
|
American Valley Csd Plumas County |
3,778 | 1 | 1 | |
|
Idyllwild Water District Riverside County |
3,762 | 2 | 0 | |
|
San Gabriel Valley Water Co-Montebello 2 Montebello · Los Angeles County |
3,731 | 0 | 0 | |
|
Forestville Water District Sonoma County |
3,717 | 1 | 0 | |
|
Cal AM Oakhurst Madera County |
3,710 | 0 | 0 | |
|
Hunter Hill Safety Roadside Rest Area Solano County |
3,707 | 0 | 0 | |
|
Mt. Shasta, City of Mount Shasta · Siskiyou County |
3,642 | 1 | 1 |
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.