All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cws-Onyx Water System Kern County |
246 | 0 | 0 | |
|
Esalen Institute WS Monterey County |
246 | 0 | 0 | |
|
Rmrc-Stony Creek Campground Tulare County |
246 | 0 | 0 | |
|
Grimmway Farms Coachella Valley Facility Riverside County |
245 | 1 | 1 | |
|
Guardian Industries LLC Fresno County |
245 | 0 | 0 | |
|
Jehovah's Witnesses Kingdom Hall Yolo County |
245 | 3 | 0 | |
|
Lava Beds National Monument Siskiyou County |
245 | 0 | 0 | |
|
Llano Mutual Water Company Los Angeles County |
245 | 1 | 1 | |
|
Snowflower Placer County |
245 | 1 | 0 | |
|
Calbee America Incorporated Madera County |
244 | 0 | 0 | |
|
College Park Mutual Water Company Sonoma County |
244 | 1 | 1 | |
|
Cws Upper Bodfish Water System Kern County |
244 | 0 | 0 | |
|
Sutter Home Winery Napa County |
244 | 0 | 0 | |
|
Charles Brown Water Company Inyo County |
242 | 3 | 1 | |
|
Mountain Valley Community Church Fresno County |
242 | 0 | 0 | |
|
Fcsa 30 EL Porvenir Fresno County |
241 | 1 | 0 | |
|
Starlite Community Service District Inyo County |
241 | 0 | 0 | |
|
Tecopa Water Vending Machine Inyo County |
241 | 2 | 0 | |
|
Ash Creek Fire Station-Stnf Siskiyou County |
240 | 0 | 0 | |
|
Cal Shasta Club San Luis Obispo County |
240 | 0 | 0 | |
|
Chanac Creek Mutual Water Company Kern County |
240 | 0 | 0 | |
|
Dante Club of Fresno Fresno County |
240 | 0 | 0 | |
|
Foster Farms Delhi Feedmill Collier Road Merced County |
240 | 0 | 0 | |
|
Klamath C.s.d. Del Norte County |
240 | 1 | 0 | |
|
Lassen Vnp Butte Lake Tehama County |
240 | 0 | 0 | |
|
Lundberg Family Farm Butte County |
240 | 1 | 1 | |
|
Millville Elementary School Shasta County |
240 | 1 | 1 | |
|
Mountain Elementary School Santa Cruz County |
240 | 1 | 1 | |
|
Nps-Cold Springs Tulare County |
240 | 0 | 0 | |
|
Pine Creek Village Inyo County |
240 | 0 | 0 | |
|
Rancho Marcelino Water Santa Barbara County |
240 | 0 | 0 | |
|
Rmrc-Hospital Flat Campground Tulare County |
240 | 0 | 0 | |
|
Wonderful Nurseries, LLC Wasco · Kern County |
240 | 0 | 0 | |
|
Cacheville Service Dist Yolo County |
239 | 8 | 1 | |
|
Caspers Regional Wilderness Park Orange County |
239 | 0 | 0 | |
|
Department of Water and Power San Bernardino County |
239 | 1 | 0 | |
|
Fishcamp Mutual Water Company Mariposa County |
239 | 0 | 0 | |
|
Kennolyn Camp Santa Cruz County |
239 | 0 | 0 | |
|
MD 05 Mountain Ranches Madera County |
239 | 0 | 0 | |
|
Ballico Csd Merced County |
238 | 1 | 0 | |
|
Bella Union Winery Napa County |
238 | 1 | 0 | |
|
Camp Lakota Water System Kern County |
238 | 0 | 0 | |
|
Casitas Mutual Water Company Ventura County |
238 | 2 | 2 | |
|
Rainbird Valley Mwc Kern County |
238 | 2 | 0 | |
|
Shaded Terrace PWS San Joaquin County |
238 | 0 | 0 | |
|
Sycamore Ranch (exempt) Yuba County |
238 | 0 | 0 | |
|
Twin Oaks Mobile Park San Joaquin County |
238 | 0 | 0 | |
|
Murrieta Palms Mobile Home Park Riverside County |
237 | 1 | 1 | |
|
Paskenta Comm. Services Dist. Tehama County |
237 | 1 | 0 | |
|
Csp-Hendy Woods State Park Mendocino County |
236 | 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.