All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Mendocino Inn and Farm C Mendocino County |
25 | 0 | 0 | |
|
Mendocino School District-Albion School Mendocino County |
25 | 0 | 0 | |
|
Michael Lucas Water System Sonoma County |
25 | 0 | 0 | |
|
Michelsen Packaging Fresno County |
25 | 0 | 0 | |
|
Mid Valley AG Stanislaus County |
25 | 0 | 0 | |
|
Mill Creek Vineyards Sonoma County |
25 | 0 | 0 | |
|
Millennium Pacific Greenhouses Kern County |
25 | 0 | 0 | |
|
Miner Family Winery Napa County |
25 | 0 | 0 | |
|
Modesto Christian Center (watersystem) Stanislaus County |
25 | 0 | 0 | |
|
Modesto Reservoir Stanislaus County |
25 | 0 | 0 | |
|
Mono Inn Mono County |
25 | 0 | 0 | |
|
Mono Lake County Park Mono County |
25 | 0 | 0 | |
|
Monrovia Nursery Venice Hills Tulare County |
25 | 2 | 2 | |
|
Monte Vista Christian School Santa Cruz County |
25 | 0 | 0 | |
|
Monterey Mushrooms Hall RD Monterey County |
25 | 1 | 1 | |
|
Moose Outdoor Sportsman Club San Joaquin County |
25 | 0 | 0 | |
|
Moreton Bay Professional Plaza Santa Barbara County |
25 | 6 | 1 | |
|
Morgan Oaks Eternal Preserve Placer County |
25 | 0 | 0 | |
|
Mountain Aire Mutual Water Company Tulare County |
25 | 0 | 0 | |
|
Mountain House Bar Alameda County |
25 | 0 | 0 | |
|
Mountain View Barbeque Mono County |
25 | 0 | 0 | |
|
Mountain View Chatom Recreation Stanislaus County |
25 | 0 | 0 | |
|
Mountain View Continuation School San Bernardino County |
25 | 1 | 0 | |
|
Murrieta/hernandez Farms Fresno County |
25 | 4 | 1 | |
|
Mora MHP County |
25 | 2 | 1 | |
|
Ncsos, McCourtney Rd. Nevada County |
25 | 1 | 1 | |
|
Newberry Mountain RV & Motel San Bernardino County |
25 | 0 | 0 | |
|
Nine Suns Winery St. Helena · Napa County |
25 | 0 | 0 | |
|
Niner Wine Estates, LLC San Luis Obispo County |
25 | 0 | 0 | |
|
Nino's Place Water System Stanislaus County |
25 | 0 | 0 | |
|
Nipton Water and Power San Bernardino County |
25 | 0 | 0 | |
|
North Fork Community Development Council Madera County |
25 | 0 | 0 | |
|
Northstar at Tahoe Comstock Water System Placer County |
25 | 0 | 0 | |
|
Nps Death Valley, Stovepipe Wells Inyo County |
25 | 1 | 0 | |
|
O-G Packing CO San Joaquin County |
25 | 0 | 0 | |
|
Oak Knoll Professional Ctr Fresno County |
25 | 0 | 0 | |
|
Oak Knoll Work Center Siskiyou County |
25 | 0 | 0 | |
|
Oakdale Golf & Country Club (eh) Stanislaus County |
25 | 0 | 0 | |
|
Oakoasis Open Space Preserve San Diego County |
25 | 1 | 0 | |
|
Oakville Grocery Co. Napa County |
25 | 1 | 1 | |
|
Oasis Market Stanislaus County |
25 | 1 | 0 | |
|
Oasis Market & Produce San Joaquin County |
25 | 0 | 0 | |
|
Ocotillo Wells Holmes Camp San Diego County |
25 | 0 | 0 | |
|
Odette Estate Water System Napa County |
25 | 0 | 0 | |
|
Offstreet Studios Mendocino County |
25 | 0 | 0 | |
|
OK Corral Amador County |
25 | 2 | 0 | |
|
Old River Golf Course San Joaquin County |
25 | 1 | 0 | |
|
Old Stage RD WS #21 Monterey County |
25 | 1 | 1 | |
|
Old Sugar Mill Winery Yolo County |
25 | 2 | 1 | |
|
Olde Towne San Joaquin County |
25 | 2 | 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.