Missouri
St. Louis County drinking water quality
25 active public water systems serve 1,151,644 people in St. Louis County. 11 are compliant, 14 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
6 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
MO American ST Louis ST Charles Counties |
1,111,000 | 0 | 0 | |
|
Kirkwood PWS Kirkwood |
28,000 | 0 | 0 | |
|
Pacific PWS Pacific |
6,000 | 4 | 1 | |
|
MO Eastern Correctional Center |
1,100 | 0 | 0 | |
|
MO American Pevely Farms |
343 | 0 | 0 | |
|
Terrisan |
240 | 2 | 0 |
Non-community systems (19: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Six Flags ST Louis |
3,200 | 0 | 0 | |
|
Rockwoods Reservation |
550 | 0 | 0 | |
|
Babler State Park |
500 | 0 | 0 | |
|
Crescent Farms Golf Club |
100 | 0 | 0 | |
|
Greensfelder County Park |
100 | 0 | 0 | |
|
Hidden Valley Golf and Ski |
100 | 0 | 0 | |
|
Jay Henges Range |
50 | 1 | 0 | |
|
Paradise Valley Golf & Country Club |
50 | 2 | 0 | |
|
Wyman |
50 | 2 | 1 | |
|
Holiday Inn at Six Flags |
30 | 1 | 1 | |
|
West Tyson County Park |
30 | 2 | 1 | |
|
Tyson Research Center |
26 | 2 | 0 | |
|
Aberdeen Golf Club |
25 | 2 | 2 | |
|
Jellystone Park Cmpgrd |
25 | 1 | 0 | |
|
Lone Elk County Park |
25 | 1 | 0 | |
|
Marianist Retreat Center |
25 | 1 | 0 | |
|
Pond Athletic Association Ballpark |
25 | 1 | 0 | |
|
Rocket #4224 |
25 | 2 | 1 | |
|
World Bird Sanctuary |
25 | 0 | 0 |
Inactive systems (34, 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.