Water quality in Rio, Wisconsin
Rio is in Columbia County. 139 active public water systems serve the county; 35 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 Columbia County
25 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Pine Haven Estates Doylestown |
45 | 2 | 4.1 mi | |
| Wyocena Waterworks Wyocena |
768 | 1 | 6.1 mi | |
| Pardeeville Waterworks Pardeeville |
2,151 | 0 | 7.2 mi | |
| Cambria Waterworks Cambria |
767 | 1 | 8.8 mi | |
| Poynette Mobile Estates Poynette |
150 | 4 | 9.1 mi | |
| Inch Heights LLC Poynette |
47 | 0 | 9.2 mi | |
| Poynette Waterworks Poynette |
2,520 | 3 | 9.8 mi | |
| Suburban Heights MHP Portage |
90 | 0 | 9.9 mi | |
| Fall River Waterworks Fall River |
1,793 | 2 | 10.0 mi | |
| Arlington Waterworks Arlington |
946 | 3 | 10.5 mi | |
| Saddle Ridge Estates Portage |
700 | 2 | 11.1 mi | |
| Capital Hill Mobile Home Park Poynette |
36 | 0 | 12.4 mi | |
| Wisconsin Academy Main Campus Columbus |
115 | 2 | 12.4 mi | |
| Friesland Waterworks Friesland |
345 | 3 | 12.7 mi | |
| Columbus Utilities Columbus |
5,173 | 2 | 12.8 mi | |
| Randolph Water Dept Randolph |
1,800 | 2 | 12.9 mi | |
| Portage Waterworks Portage |
10,437 | 0 | 14.2 mi | |
| Harmony Mobile Manor Lodi |
45 | 0 | 15.2 mi | |
| Oakwood Terrace Portage |
100 | 0 | 17.0 mi | |
| Harmony Grove San Dist Lodi |
1,950 | 0 | 17.2 mi | |
| Lodi Waterworks Lodi |
3,146 | 3 | 17.8 mi | |
| Crystal Lake RV Resort LLC Lodi |
725 | 1 | 23.1 mi | |
| Dells Estates Wisconsin Dells |
30 | 3 | 23.3 mi | |
| Pine Vista MHP 1 Prairie Du Sac |
60 | 0 | 26.5 mi | |
| Wisconsin Dells Waterworks Wisconsin Dells |
3,232 | 2 | 30.0 mi |
Non-community systems in Columbia County (113: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Columbia County, nearest to Rio 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.