County · Illinois
Grundy County, Illinois: drinking water records
This overview covers 8 ZIP codes and 19 community water systems in Grundy 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 |
|---|---|---|---|---|---|
| Coal City IL0630200 | 5,749 | 60 | 0 | 7 | 0 ppb |
| Morris IL0630600 | 14,775 | 60 | 0 | 0 | 0 ppb |
| Minooka IL0630550 | 12,800 | 180 | 1 | 0 | 1.1 ppb |
| Shady Oaks MHP IL0635225 | 912 | 60 | 0 | 0 | 0 ppb |
| Braceville IL0630050 | 800 | 0 | 0 | 1 | 5.0 ppb |
| Bookwalter Woods MHP IL0635125 | 389 | 60 | 0 | 0 | 0 ppb |
| Prairie Oaks Ests Homeowners Assn IL0630060 | 107 | 0 | 0 | 1 | 0 ppb |
| Diamond IL0630250 | 2,508 | 0 | 0 | 0 | 0 ppb |
| Gardner IL0630400 | 1,361 | 0 | 0 | 0 | 0 ppb |
| Mazon IL0630500 | 994 | 0 | 0 | 0 | 5.3 ppb |
| South Wilmington IL0630650 | 700 | 0 | 0 | 0 | 0 ppb |
| Carbon Hill IL0630100 | 370 | 0 | 0 | 0 | 0 ppb |
| Il American-Nettle Creek IL0630040 | 317 | 0 | 0 | 0 | 0 ppb |
| Il American-Ridgecrest IL0635100 | 203 | 0 | 0 | 0 | 0 ppb |
| Kinsman IL0630450 | 99 | 0 | 0 | 0 | 1.8 ppb |
| Heatherfield Subdivision IL0635150 | 90 | 0 | 0 | 0 | 8.1 ppb |
| Ridgecrest North Subdivision IL0635250 | 60 | 0 | 0 | 0 | 7 ppb |
| Hawthorn Estates Subdivision IL0630030 | 49 | 0 | 0 | 0 | 0.6 ppb |
| Lisbon North, INC. IL0631000 | 25 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Grundy 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: 60479.
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.