County · Illinois
Winnebago County, Illinois: drinking water records
This overview covers 20 ZIP codes and 23 community water systems in Winnebago County. It also stands in for 2 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 |
|---|---|---|---|---|---|
| Rockton IL2010350 | 7,685 | 240 | 1 | 1 | 1.4 ppb |
| Cherry Valley IL2010050 | 4,731 | 240 | 0 | 2 | 0 ppb |
| Rockford IL2010300 | 147,051 | 1,320 | 2 | 0 | 7.3 ppb |
| North Park Pwd IL2015500 | 35,580 | 180 | 7 | 0 | 5.3 ppb |
| Loves Park IL2010150 | 23,335 | 240 | 0 | 0 | 1.6 ppb |
| Il American-South Beloit IL2010450 | 7,893 | 60 | 1 | 0 | 4 ppb |
| Durand IL2010100 | 1,427 | 0 | 0 | 2 | 0 ppb |
| Prairie Road Pump Corporation IL2015100 | 150 | 0 | 0 | 1 | 0 ppb |
| Phil-Aire Estates MHP IL2015625 | 80 | 0 | 0 | 2 | 0 ppb |
| Winnebago IL2010500 | 2,940 | 0 | 0 | 0 | 6 ppb |
| Otter Creek Lake Utilities District IL2015320 | 2,342 | 0 | 0 | 0 | 0 ppb |
| Pecatonica IL2010250 | 2,195 | 0 | 0 | 0 | 10 ppb |
| Prairie Path Water Company-Westlake IL2010070 | 1,493 | 0 | 0 | 0 | 1.2 ppb |
| Forest View MHP IL2010030 | 650 | 0 | 0 | 0 | 0 ppb |
| Prairie Path Water Company-Coventry Hill IL2015150 | 608 | 0 | 0 | 0 | 6.9 ppb |
| Prairie Path Water Company-Wildwood IL2015400 | 490 | 0 | 0 | 0 | 2.6 ppb |
| Prairie Path Water Co-Coventry Creek IL2015160 | 270 | 0 | 0 | 0 | 0.6 ppb |
| Legend Lakes Water Association IL2015300 | 250 | 0 | 0 | 0 | 0 ppb |
| Aqua Illinois-Sheridan Grove IL2010080 | 100 | 0 | 0 | 0 | 1.4 ppb |
| Northgate Estates MHP IL2010470 | 100 | 0 | 0 | 1 | not reported |
| Clarks MHP IL2015425 | 90 | 0 | 0 | 0 | 0 ppb |
| Bradley Heights Subdivision IL2015050 | 82 | 0 | 0 | 0 | 11.8 ppb |
| Six Oaks MHP IL2015685 | 48 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Winnebago 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: 61077, 61079.
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.