County · Illinois
Hancock County, Illinois: drinking water records
This overview covers 16 ZIP codes and 11 community water systems in Hancock 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 |
|---|---|---|---|---|---|
| Carthage IL0670250 | 2,510 | 0 | 0 | 1 | 5.9 ppb |
| Laharpe IL0670450 | 1,200 | 0 | 0 | 4 | 0 ppb |
| Bowen IL0670200 | 494 | 0 | 0 | 3 | 0 ppb |
| Hamilton IL0670400 | 2,753 | 0 | 0 | 0 | 2.2 ppb |
| Warsaw IL0670650 | 1,480 | 0 | 0 | 0 | 2.9 ppb |
| Nauvoo IL0670500 | 1,200 | 0 | 0 | 0 | 2.4 ppb |
| Dallas City IL0674300 | 788 | 0 | 0 | 0 | 3.1 ppb |
| Augusta IL0670050 | 553 | 0 | 0 | 0 | 4.3 ppb |
| Plymouth IL0670550 | 460 | 0 | 0 | 0 | 8 ppb |
| West Point IL0670700 | 248 | 0 | 0 | 0 | 0 ppb |
| Elvaston IL0670010 | 165 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Hancock 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.