COUNTY WATER-SYSTEM LEDGER
Williamson, Illinois
EPA’s September 2026 export lists 8 active community water systems serving Williamson, Illinois, with 3 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Williamson, Illinois
EPA associates 8 covered systems with Williamson, Illinois; their reported population-served values total 61,905 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| MarionIL1990550 | 16,855 | Surface water purchased | No current violation flagged |
| HerrinIL1990400 | 12,747 | Surface water purchased | Current monitoring/reporting flag |
| Lake Of Egypt PwdIL1995200 | 11,368 | Surface water | No current violation flagged |
| CartervilleIL1990150 | 6,528 | Surface water purchased | No current violation flagged |
| Coal Valley PwdIL1995250 | 4,023 | Surface water purchased | No current violation flagged |
| Corinth PwdIL1995120 | 3,927 | Surface water purchased | Other current violation flag |
| Johnston CityIL1990500 | 3,509 | Surface water purchased | Current monitoring/reporting flag |
| PittsburgIL1990600 | 2,948 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Williamson, Illinois
EPA classifies 8 systems serving Williamson, Illinois across 2 primary-source categories; Surface water purchased is the largest category with 7 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.