County · Wisconsin
Rock County, Wisconsin: drinking water records
This overview covers 13 ZIP codes and 18 community water systems in Rock 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 |
|---|---|---|---|---|---|
| Beloit City of WI1540112 | 36,677 | 420 | 1 | 2 | 4.5 ppb |
| Evansville Waterworks WI1540047 | 5,703 | 120 | 0 | 6 | 6.3 ppb |
| Milton Waterworks WI1540130 | 5,588 | 240 | 0 | 1 | 1.5 ppb |
| Edgerton Waterworks WI1540119 | 5,512 | 180 | 0 | 2 | 2.8 ppb |
| Janesville Water Utility WI1540127 | 64,415 | 180 | 0 | 0 | 10 ppb |
| Clinton Waterworks WI1540114 | 2,119 | 120 | 0 | 0 | 0.3 ppb |
| Footville Waterworks WI1540125 | 816 | 0 | 0 | 1 | 0 ppb |
| Caravilla Education and Rehab Center WI1540111 | 298 | 0 | 0 | 1 | 3.0 ppb |
| County Line Estates WI1540135 | 240 | 0 | 0 | 1 | 0 ppb |
| Fulton Utility District WI1541223 | 200 | 0 | 0 | 2 | 2.5 ppb |
| Shady Hill Mobile Home Park WI1540115 | 140 | 0 | 0 | 1 | 0.4 ppb |
| Pirates Cove Mobile Home Community WI1540118 | 25 | 0 | 0 | 1 | 0 ppb |
| Orfordville Waterworks WI1540132 | 1,475 | 0 | 0 | 0 | 0.7 ppb |
| Rock River Leisure Estates Coop WI1540167 | 650 | 0 | 0 | 0 | 10.1 ppb |
| Oakhill Waterworks WI1540116 | 130 | 0 | 0 | 0 | 1.1 ppb |
| Mountain View MHP 1 WI1540121 | 50 | 0 | 0 | 0 | 1.6 ppb |
| Birchwood Trailer Court WI1540770 | 32 | 0 | 0 | 0 | 0.5 ppb |
| Mountain View MHP 2 WI1541112 | 25 | 0 | 0 | 0 | 2.9 ppb |
ZIP reports in Rock 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: 53501, 53505.
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.