County · Illinois
Williamson County, Illinois: drinking water records
This overview covers 12 ZIP codes and 24 community water systems in Williamson County. It also stands in for 1 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Lake of Egypt Pwd IL1995200 | 11,368 | 120 | 0 | 2 | 0 ppb |
| Johnston City IL1990500 | 3,509 | 120 | 1 | 1 | 7.7 ppb |
| Marion IL1990550 | 16,855 | 120 | 1 | 0 | 14 ppb |
| Herrin IL1990400 | 12,747 | 120 | 1 | 0 | 10 ppb |
| Carterville IL1990150 | 6,528 | 120 | 1 | 0 | 7.5 ppb |
| Coal Valley Pwd IL1995250 | 4,023 | 120 | 0 | 0 | 0 ppb |
| Corinth Pwd IL1995120 | 3,927 | 120 | 1 | 0 | 4.6 ppb |
| Devils Kitchen Water District IL1995160 | 1,428 | 0 | 0 | 5 | 0 ppb |
| Highway 37 North Pwd IL1995100 | 1,065 | 0 | 0 | 1 | 0 ppb |
| Blairsville Pwd IL1995350 | 807 | 0 | 0 | 3 | 0 ppb |
| Hurst IL1990450 | 782 | 0 | 0 | 1 | 0 ppb |
| Creal Springs IL1990300 | 683 | 0 | 0 | 3 | 0 ppb |
| Colp IL1990200 | 506 | 0 | 0 | 1 | 0 ppb |
| Freeman Spur IL1994420 | 373 | 0 | 0 | 1 | 0 ppb |
| Pittsburg IL1990600 | 2,948 | 0 | 0 | 0 | 0 ppb |
| Cambria IL1990100 | 1,727 | 0 | 0 | 0 | 0 ppb |
| Crainville IL1990250 | 1,711 | 0 | 0 | 0 | 0 ppb |
| Fci-Marion IL1995247 | 1,544 | 0 | 0 | 0 | 0 ppb |
| Ferges Water District IL1995050 | 1,185 | 0 | 0 | 0 | 0 ppb |
| Energy IL1990350 | 984 | 0 | 0 | 0 | 0 ppb |
| Bush IL1990050 | 285 | 0 | 0 | 0 | 0 ppb |
| The Orchards MHC IL1990120 | 253 | 0 | 0 | 0 | 0 ppb |
| Marion Mobile Home Village IL1990560 | 170 | 0 | 0 | 0 | 0 ppb |
| Crab Orchard Refuge IL1997037 | 25 | 0 | 0 | 0 | 2.2 ppb |
ZIP reports in Williamson County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 62841.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.