Water quality for ZIP code 50478
ZIP 50478 covers Thompson in Winnebago County, Iowa, one of 7 ZIP codes in the county. 19 active public water systems serve the county; 8 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 Winnebago County
6 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Buffalo Center Muni Water Dept Buffalo Center |
857 | 0 | 8.4 mi | |
| Rake Water Supply Rake |
186 | 0 | 8.6 mi | |
| Leland Water Supply Leland |
249 | 1 | 9.0 mi | |
| Rocky Knoll MHP Forest City |
49 | 3 | 11.4 mi | |
| Forest City Water Supply Forest City |
4,285 | 0 | 12.6 mi | |
| Lake Mills Municipal Water Dept-South Lake Mills |
2,158 | 0 | 12.6 mi |
Non-community systems in Winnebago County (12: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Iowa Cage Free Thompson Thompson |
170 | 0 | 0 | |
|
Winnebago CC Environmental Educ Center Leland |
25 | 4 | 1 | |
|
Christensen Farms Midwest LLC Forest City |
25 | 1 | 0 | |
|
Five Star Cooperative (scarville) Scarville |
114 | 0 | 0 | |
|
Scarville Lutheran Church Scarville |
95 | 0 | 0 | |
|
Three Fingers Campground Forest City |
252 | 1 | 0 | |
|
Thorpe Park-Winnebago Conservation Forest City |
60 | 1 | 0 | |
|
Word of Faith Dominion Church Lake Mills |
81 | 2 | 0 | |
|
The Barn (buffalo Center) Buffalo Center |
60 | 0 | 0 | |
|
Super Bowl Forest City |
110 | 0 | 0 | |
|
Rice Lake Golf & Country Club Lake Mills |
100 | 3 | 0 | |
|
Pilot Knob State Park-Campground Forest City |
50 | 0 | 0 |
About this data
Water systems are matched to Winnebago County, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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 Iowa 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.