County · Illinois
Mercer County, Illinois: drinking water records
This overview covers 13 ZIP codes and 14 community water systems in Mercer 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 |
|---|---|---|---|---|---|
| Aledo IL1310050 | 3,470 | 60 | 0 | 0 | 3 ppb |
| New Windsor IL1310500 | 740 | 0 | 0 | 3 | 6.2 ppb |
| Viola IL1310450 | 970 | 0 | 0 | 0 | 1.1 ppb |
| Sherrard IL1310400 | 785 | 0 | 0 | 0 | 3 ppb |
| Fyre Lake Water Company IL1315050 | 760 | 0 | 0 | 0 | 2.2 ppb |
| Keithsburg IL1310150 | 747 | 0 | 0 | 0 | 0 ppb |
| Matherville IL1310200 | 651 | 0 | 0 | 0 | 11.6 ppb |
| New Boston IL1310250 | 613 | 0 | 0 | 0 | 1.5 ppb |
| Joy IL1310100 | 377 | 0 | 0 | 0 | 1.7 ppb |
| Brookside Meadows MHP WI2671738 | 250 | 0 | 0 | 0 | 3.3 ppb |
| North Henderson IL1310300 | 172 | 0 | 0 | 0 | 1.3 ppb |
| Swedona Water Association IL1315200 | 109 | 0 | 0 | 0 | 0.7 ppb |
| M C L W System, INC. IL1315150 | 98 | 0 | 0 | 0 | 1 ppb |
| Unity Water Corporation IL1315300 | 93 | 0 | 0 | 0 | 0.7 ppb |
ZIP reports in Mercer 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: 61276.
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.