Missouri
Warren County drinking water quality
31 active public water systems serve 25,792 people in Warren County. 14 are compliant, 17 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.
Needs attention
Community water systems
18 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Warrenton PWS Warrenton |
8,208 | 0 | 0 | |
|
Montgomery CO Pwsd 1 |
3,850 | 4 | 2 | |
|
ST Charles CO Pwsd #2 Wright City Wright City |
3,550 | 1 | 0 | |
|
Marthasville PWS Marthasville |
1,200 | 2 | 2 | |
|
MO American Warren County Water & Sewer |
1,200 | 0 | 0 | |
|
ST Charles County Pwsd 2 Warren |
1,192 | 0 | 0 | |
|
Lake Sherwood Subd |
1,100 | 4 | 0 | |
|
Truesdale PWS Truesdale |
853 | 0 | 0 | |
|
Innsbrook |
810 | 2 | 2 | |
|
ST Charles County Pwsd 2 North Oak DR |
660 | 1 | 0 | |
|
ST Charles County Pwsd 2 Dutzow |
400 | 0 | 0 | |
|
Pleasant Oak MHP |
150 | 3 | 3 | |
|
Maple Ridge MHP |
140 | 1 | 0 | |
|
Glenbrook Estates |
100 | 2 | 2 | |
|
Cedar Grove Village Subd |
60 | 4 | 2 | |
|
Country Cove |
52 | 2 | 1 | |
|
Valley Lake Estates |
40 | 3 | 2 | |
|
Great Oak Subdivision Wright City |
30 | 1 | 0 |
Non-community systems (13: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
American Foods Group |
1,100 | 1 | 1 | |
|
Big Joels Safari |
500 | 0 | 0 | |
|
Dogwood Lake Campground |
200 | 0 | 0 | |
|
Treloar Bar and Grill Marthasville |
75 | 0 | 0 | |
|
ST Ignatius Loyola School |
60 | 1 | 0 | |
|
Cedar Lake Cellars |
50 | 3 | 2 | |
|
Temco |
50 | 1 | 0 | |
|
Warco Mfg CO |
32 | 0 | 0 | |
|
Blumenhof Winery |
30 | 0 | 0 | |
|
Dollar General #24942 Innsbrook |
25 | 0 | 0 | |
|
Garage Bar Marthasville |
25 | 0 | 0 | |
|
Lake Creek Farm Winery Marthasville |
25 | 0 | 0 | |
|
Washington Airport |
25 | 0 | 0 |
Inactive systems (22, 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 Missouri 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. Retrieved from ECHO on Oct 11, 2026.