California
Madera County drinking water quality
202 active public water systems serve 187,073 people in Madera County. 124 are compliant, 78 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 17 carry a health flag.
Needs attention
7 more systems with a serious violator or health flag designation are in the lists below.
Community water systems
68 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cal AM Coarsegold |
93 | 0 | 0 | |
|
Bonadelle Ranchos No. 2 Mutual Water CO |
89 | 0 | 0 | |
|
MD 36 Eastin Arcola |
84 | 1 | 0 | |
|
Crass Mutual Water Company |
80 | 1 | 1 | |
|
John Hovannisian Water System |
80 | 8 | 1 | |
|
MD 58 Sierra Highlands |
75 | 0 | 0 | |
|
Pike Ranch Mutual Water CO |
74 | 4 | 1 | |
|
Cascadel Mutual Water System |
50 | 1 | 0 | |
|
Marquez Rental |
50 | 2 | 0 | |
|
MD 28 Ripperdan Self Help |
48 | 1 | 0 | |
|
Leisure Acres Mutual Water Company |
45 | 0 | 0 | |
|
MD 85 Valeta |
45 | 0 | 0 | |
|
Bass Lake Annex 3 |
42 | 1 | 0 | |
|
The Village |
40 | 0 | 0 | |
|
Whispering Pines MHP |
38 | 0 | 0 | |
|
Two Twenty Four Mobile Home PK |
35 | 3 | 2 | |
|
Mammoth Pool Mobile Home Park |
30 | 2 | 1 | |
|
Shady Oaks Mobile Home Park LLC |
23 | 2 | 0 |
Non-community systems (134: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (114, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.