Illinois
Williamson County drinking water quality
26 active public water systems serve 75,486 people in Williamson County. 6 are compliant, 20 had at least one EPA violation in the past three years, 0 are designated serious violators, and 2 carry a health flag.
Needs attention
Community water systems
24 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Marion Marion |
16,855 | 0 | 0 | |
|
Herrin Herrin |
12,747 | 6 | 0 | |
|
Lake of Egypt Pwd Marion |
11,368 | 1 | 0 | |
|
Carterville Carterville |
6,528 | 2 | 0 | |
|
Coal Valley Pwd |
4,023 | 1 | 0 | |
|
Corinth Pwd |
3,927 | 2 | 1 | |
|
Johnston City Johnston City |
3,509 | 4 | 0 | |
|
Pittsburg Pittsburg |
2,948 | 0 | 0 | |
|
Cambria Cambria |
1,727 | 1 | 0 | |
|
Crainville Crainville |
1,711 | 3 | 0 | |
|
Fci-Marion Marion |
1,544 | 3 | 2 | |
|
Devils Kitchen Water District |
1,428 | 6 | 1 | |
|
Ferges Water District |
1,185 | 2 | 2 | |
|
Highway 37 North Pwd |
1,068 | 2 | 0 | |
|
Energy Energy |
984 | 0 | 0 | |
|
Blairsville Pwd Carterville |
807 | 6 | 1 | |
|
Hurst Hurst |
782 | 4 | 2 | |
|
Creal Springs Creal Springs |
683 | 2 | 0 | |
|
Colp Colp |
506 | 3 | 0 | |
|
Freeman Spur Freemanspur |
373 | 1 | 1 | |
|
Bush Bush |
285 | 1 | 0 | |
|
The Orchards MHC Carterville |
253 | 0 | 0 | |
|
Marion Mobile Home Village Marion |
170 | 0 | 0 | |
|
Crab Orchard Refuge |
25 | 0 | 0 |
Non-community systems (2: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
LJ Ice Company |
25 | 1 | 1 | |
|
Walmart Supercenter #0216 |
25 | 1 | 1 |
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 Illinois 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.