Water quality in Lake Wisconsin, Wisconsin
Lake Wisconsin is in Sauk County. 194 active public water systems serve the county; 32 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Sauk County
24 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Merrimac Estates MHP Merrimac |
37 | 0 | 2.3 mi | |
| Summer Oaks Condo Assoc Merrimac |
70 | 0 | 4.0 mi | |
| Prairie DU Sac Waterworks Prairie Du Sac |
4,006 | 2 | 8.7 mi | |
| Maple Park Condominiums Prairie Du Sac |
150 | 2 | 8.8 mi | |
| Bluffview Sanitary District Prairie Du Sac |
450 | 2 | 8.8 mi | |
| Sauk City Waterworks Sauk City |
3,518 | 1 | 9.2 mi | |
| Glacier View Subdivision Baraboo |
75 | 3 | 10.1 mi | |
| Baraboo Waterworks Baraboo |
12,703 | 0 | 10.3 mi | |
| West Baraboo Waterworks West Baraboo |
1,414 | 0 | 11.6 mi | |
| North Freedom Waterworks North Freedom |
589 | 1 | 14.8 mi | |
| Lower Dells MHC Lake Delton |
75 | 0 | 16.5 mi | |
| Lake Delton Waterworks Lake Delton |
2,914 | 1 | 16.6 mi | |
| Rock Springs Waterworks Rock Springs |
292 | 1 | 17.9 mi | |
| Dell Creek Estates Reedsburg |
50 | 3 | 18.4 mi | |
| Equinox Rei LLC Dellwood Estates Reedsburg |
70 | 0 | 19.0 mi | |
| Loganville Waterworks Loganville |
300 | 0 | 22.7 mi | |
| Reedsburg Waterworks Reedsburg |
9,984 | 0 | 23.0 mi | |
| Plain Waterworks Plain |
792 | 2 | 23.3 mi | |
| Spring Green Waterworks Spring Green |
1,626 | 0 | 26.9 mi | |
| Spring Green Estates Spring Green |
300 | 0 | 27.1 mi | |
| Spring Green Estates North Spring Green |
32 | 2 | 27.1 mi | |
| Spring Green Estates South Spring Green |
40 | 2 | 27.8 mi | |
| Ironton Waterworks La Valle |
253 | 4 | 30.1 mi | |
| LA Valle Waterworks La Valle |
365 | 1 | 30.7 mi |
Non-community systems in Sauk County (169: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Sauk County, nearest to Lake Wisconsin 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.