Water quality in Janesville, Wisconsin
Janesville is in Rock County. 158 active public water systems serve the county; 26 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Rock County
19 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Caravilla Education and Rehab Center Janesville |
298 | 4 | 5.8 mi | |
| Rockvale MHP Janesville |
1,200 | 0 | 6.5 mi | |
| Milton Waterworks Milton |
5,588 | 0 | 7.7 mi | |
| Footville Waterworks Footville |
816 | 1 | 9.3 mi | |
| Rock River Leisure Estates Coop Edgerton |
650 | 3 | 9.9 mi | |
| Oakhill Waterworks Edgerton |
130 | 1 | 10.1 mi | |
| Shady Hill Mobile Home Park Clinton |
140 | 3 | 10.7 mi | |
| Beloit City of Beloit |
36,677 | 1 | 10.8 mi | |
| Edgerton Waterworks Edgerton |
5,512 | 2 | 11.0 mi | |
| Fulton Utility District Edgerton |
200 | 3 | 11.1 mi | |
| Clinton Waterworks Clinton |
2,119 | 0 | 11.7 mi | |
| Orfordville Waterworks Orfordville |
1,475 | 0 | 12.4 mi | |
| Midway Village Mobile Home Park Evansville |
160 | 4 | 13.7 mi | |
| Mountain View MHP 1 Evansville |
50 | 1 | 13.9 mi | |
| Birchwood Trailer Court Evansville |
32 | 1 | 15.2 mi | |
| Mountain View MHP 2 Evansville |
25 | 1 | 15.2 mi | |
| Evansville Waterworks Evansville |
5,703 | 2 | 15.2 mi | |
| County Line Estates Whitewater |
240 | 1 | 15.9 mi | |
| Pirates Cove Mobile Home Community Edgerton |
25 | 2 | 29.1 mi |
Non-community systems in Rock County (138: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Rock County, nearest to Janesville first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.