County · Illinois
Knox County, Illinois: drinking water records
This overview covers 17 ZIP codes and 19 community water systems in Knox 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 |
|---|---|---|---|---|---|
| Abingdon IL0950050 | 3,275 | 60 | 5 | 2 | 0 ppb |
| Galesburg IL0950200 | 31,620 | 60 | 5 | 0 | 0 ppb |
| Wataga IL0950600 | 965 | 0 | 0 | 1 | 1.3 ppb |
| Williamsfield IL0950650 | 647 | 0 | 0 | 1 | 3.0 ppb |
| Altona IL0950100 | 483 | 60 | 0 | 0 | 4.1 ppb |
| Henderson IL0950250 | 375 | 0 | 0 | 1 | 0.6 ppb |
| Knoxville IL0950300 | 3,120 | 0 | 0 | 0 | 0 ppb |
| Aqua Illinois-Oak Run IL0955200 | 1,885 | 0 | 0 | 0 | 4 ppb |
| Rock Springs MHP FL3481093 | 1,338 | 0 | 0 | 0 | 2.9 ppb |
| East Galesburg IL0950150 | 860 | 0 | 0 | 0 | 3.4 ppb |
| Yates City IL0950700 | 828 | 0 | 0 | 0 | 5.4 ppb |
| Oneida IL0950400 | 644 | 0 | 0 | 0 | 0 ppb |
| Victoria IL0950550 | 268 | 0 | 0 | 0 | 0 ppb |
| Rio IL0950450 | 265 | 0 | 0 | 0 | 1.6 ppb |
| Midwest MHP Lindale LLC MO1041651 | 250 | 0 | 0 | 0 | 0 ppb |
| Maquon IL0950350 | 218 | 0 | 0 | 0 | 0 ppb |
| Windwood Water System, INC. IL0955040 | 185 | 0 | 0 | 0 | 0 ppb |
| Prairie Path Water Company-Cedar Water IL0955150 | 172 | 0 | 0 | 0 | 2.2 ppb |
| St Augustine IL0950500 | 119 | 0 | 0 | 0 | 10 ppb |
ZIP reports in Knox 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: 61436.
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.