County · Illinois
Stephenson County, Illinois: drinking water records
This overview covers 14 ZIP codes and 13 community water systems in Stephenson County. It also stands in for 4 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 |
|---|---|---|---|---|---|
| Freeport IL1770200 | 23,930 | 240 | 1 | 0 | 12 ppb |
| Winslow IL1770550 | 350 | 0 | 0 | 2 | 0 ppb |
| Timber Ridge Mobile Estates IL1775255 | 150 | 0 | 0 | 3 | 0 ppb |
| Lena IL1770300 | 2,680 | 0 | 0 | 0 | 0 ppb |
| Pearl City IL1770400 | 790 | 0 | 0 | 0 | 0.4 ppb |
| Orangeville IL1770350 | 780 | 0 | 0 | 0 | 0 ppb |
| Cedarville IL1770050 | 663 | 0 | 0 | 0 | 2 ppb |
| Prairie Path Water Company-Northern Hill IL1775050 | 600 | 0 | 0 | 0 | 0 ppb |
| Davis IL1770150 | 589 | 0 | 0 | 0 | 0 ppb |
| Dakota IL1770100 | 500 | 0 | 0 | 0 | 4.8 ppb |
| German Valley IL1770250 | 463 | 0 | 0 | 0 | 1.4 ppb |
| Rock City IL1770500 | 293 | 0 | 0 | 0 | 0 ppb |
| Stephenson Mobile Estates IL1775235 | 75 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Stephenson 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: 61027, 61044, 61050, 61067.
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.