County · Illinois
Jo Daviess County, Illinois: drinking water records
This overview covers 9 ZIP codes and 15 community water systems in Jo Daviess 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 |
|---|---|---|---|---|---|
| Galena IL0850200 | 3,308 | 180 | 0 | 1 | 3.2 ppb |
| Prairie Path Water Company-Galena IL0855050 | 2,294 | 360 | 0 | 1 | 11 ppb |
| Stockton IL0850450 | 1,728 | 0 | 0 | 1 | 0 ppb |
| Hanover IL0850250 | 863 | 120 | 0 | 0 | 3.9 ppb |
| Forrest Brooke MHP PA6430062 | 491 | 0 | 0 | 2 | 2 ppb |
| East Dubuque IL0850100 | 1,565 | 0 | 0 | 0 | 0 ppb |
| Warren IL0850500 | 1,323 | 0 | 0 | 0 | 0 ppb |
| Prairie Path Water Company-Apple Canyon IL0855150 | 931 | 0 | 0 | 0 | 3.6 ppb |
| Elizabeth IL0850150 | 802 | 0 | 0 | 0 | 3.3 ppb |
| Prairie Path Water-Bahl Water Company IL0855200 | 700 | 0 | 0 | 0 | 2 ppb |
| Mount Vernon Association INC IL0855100 | 438 | 0 | 0 | 0 | 0 ppb |
| Scales Mound IL0850400 | 436 | 0 | 0 | 0 | 4.8 ppb |
| Apple River IL0850050 | 347 | 0 | 0 | 0 | 0 ppb |
| Frentress Lake IL0850010 | 233 | 0 | 0 | 0 | 0 ppb |
| Wienen Estates IL0850030 | 95 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Jo Daviess 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: 61059.
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.