Wisconsin
Rock County drinking water quality
158 active public water systems serve 148,807 people in Rock County. 132 are compliant, 26 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
20 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Janesville Water Utility Janesville |
64,415 | 0 | 0 | |
|
Beloit City of Beloit |
36,677 | 1 | 0 | |
|
Evansville Waterworks Evansville |
5,703 | 2 | 0 | |
|
Milton Waterworks Milton |
5,588 | 0 | 0 | |
|
Edgerton Waterworks Edgerton |
5,512 | 2 | 1 | |
|
Clinton Waterworks Clinton |
2,119 | 0 | 0 | |
|
Orfordville Waterworks Orfordville |
1,475 | 0 | 0 | |
|
Rockvale MHP Janesville |
1,200 | 0 | 0 | |
|
Footville Waterworks Footville |
816 | 1 | 0 | |
|
Rock River Leisure Estates Coop Edgerton |
650 | 3 | 1 | |
|
Caravilla Education and Rehab Center Janesville |
298 | 4 | 2 | |
|
County Line Estates Whitewater |
240 | 1 | 0 | |
|
Fulton Utility District Edgerton |
200 | 3 | 1 | |
|
Midway Village Mobile Home Park Evansville |
160 | 4 | 1 | |
|
Shady Hill Mobile Home Park Clinton |
140 | 3 | 1 | |
|
Oakhill Waterworks Edgerton |
130 | 1 | 1 | |
|
Mountain View MHP 1 Evansville |
50 | 1 | 0 | |
|
Birchwood Trailer Court Evansville |
32 | 1 | 1 | |
|
Mountain View MHP 2 Evansville |
25 | 1 | 0 | |
|
Pirates Cove Mobile Home Community Edgerton |
25 | 2 | 1 |
Non-community systems (138: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (174, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.