Water quality in Lake Koshkonong, Wisconsin
Lake Koshkonong is in Jefferson County. 194 active public water systems serve the county; 28 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Jefferson County
26 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Oak Ridge Mobile Com 1 & 2 Fort Atkinson |
133 | 0 | 5.8 mi | |
| Oak Ridge Mobile Com 3 Fort Atkinson |
58 | 0 | 6.3 mi | |
| Fort Atkinson Waterworks Fort Atkinson |
12,390 | 0 | 6.4 mi | |
| Breezy Knoll Community Cambridge |
116 | 0 | 7.7 mi | |
| Ripview Court 1 Cambridge |
35 | 0 | 8.3 mi | |
| Ripview Court 4 Cambridge |
35 | 0 | 8.3 mi | |
| Ripview Court 2 Cambridge |
31 | 0 | 8.3 mi | |
| Ripview Court 3 Cambridge |
31 | 0 | 8.3 mi | |
| Wolfs Mobile Homes Whitewater |
40 | 3 | 8.8 mi | |
| Jefferson Waterworks Jefferson |
7,926 | 3 | 10.9 mi | |
| Lake Mills Waterworks Lake Mills |
6,211 | 2 | 12.9 mi | |
| Rock River Mobile Home Park Johnson Creek |
30 | 4 | 14.1 mi | |
| Johnson Creek Waterworks Johnson Creek |
3,318 | 4 | 15.9 mi | |
| Palmyra Waterworks Palmyra |
1,756 | 0 | 18.8 mi | |
| Waterloo Waterworks Waterloo |
3,520 | 2 | 20.3 mi | |
| Tremain Mobile Home Park Dousman |
475 | 4 | 21.3 mi | |
| Spacious Acres Mobile Home Community Sullivan |
525 | 0 | 21.5 mi | |
| Watertown Waterworks Watertown |
23,945 | 1 | 23.7 mi | |
| Hickory Hill Park LLC Watertown |
31 | 0 | 24.2 mi | |
| Autumn Ridge Water System LLC Ixonia |
575 | 2 | 24.9 mi | |
| Stanton Place II Ixonia |
32 | 0 | 25.0 mi | |
| River Valley Apts South Ixonia |
48 | 1 | 25.2 mi | |
| Parkview Apartments Ixonia |
45 | 2 | 25.3 mi | |
| Stanton Place I Ixonia |
66 | 0 | 25.3 mi | |
| River Valley Apts North Ixonia |
48 | 1 | 25.9 mi |
Non-community systems in Jefferson County (167: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Jefferson County, nearest to Lake Koshkonong 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.