County · Illinois
Washington County, Illinois: drinking water records
This overview covers 10 ZIP codes and 12 community water systems in Washington County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Washington County Water Company IL1895600 | 11,374 | 480 | 1 | 1 | 2 ppb |
| Nashville IL1890300 | 3,230 | 120 | 0 | 0 | 2 ppb |
| Okawville IL1890400 | 1,457 | 0 | 0 | 1 | 11 ppb |
| Irvington IL1890250 | 1,081 | 0 | 0 | 0 | 0 ppb |
| Hoyleton Rwc IL1895400 | 1,020 | 0 | 0 | 0 | 0 ppb |
| Hoyleton IL1890200 | 658 | 0 | 0 | 0 | 0 ppb |
| Ashley IL1890100 | 565 | 0 | 0 | 0 | 1.9 ppb |
| New Minden IL1890350 | 343 | 0 | 0 | 0 | 0 ppb |
| Richview IL1890500 | 251 | 0 | 0 | 0 | 0 ppb |
| Dubois IL1890150 | 200 | 0 | 0 | 0 | 2.2 ppb |
| Radom IL1890450 | 193 | 0 | 0 | 0 | 0 ppb |
| Hoyleton-New Minden IL1895500 | 35 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Washington County
No ZIP report in this county is published yet.
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.