Water quality for ZIP code 51010
ZIP 51010 covers Castana in Monona County, Iowa, one of 9 ZIP codes in the county. 14 active public water systems serve the county; 8 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Monona County
7 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Mapleton Municipal Water Plant Mapleton |
1,124 | 1 | 8.1 mi | |
| Soldier Water Supply Soldier |
180 | 2 | 9.5 mi | |
| Onawa Municipal Water Plant Onawa |
2,906 | 0 | 10.6 mi | |
| Ute Water Supply Ute |
338 | 4 | 10.7 mi | |
| Moorhead Water Supply Moorhead |
189 | 2 | 11.6 mi | |
| Whiting Water Supply Whiting |
727 | 0 | 12.7 mi | |
| Blencoe Municipal Waterworks Blencoe |
224 | 0 | 13.9 mi |
Non-community systems in Monona County (6: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Divide Hill Bar & Grill Castana |
50 | 1 | 1 | |
|
Timber Ridge Lodge Recreation, Ltd. Castana |
250 | 0 | 0 | |
|
Peters Park Rodney |
32 | 0 | 0 | |
|
Onawa KOA Onawa |
250 | 1 | 0 | |
|
Lewis and Clark State Park Onawa |
67 | 2 | 1 | |
|
Sunset at the Oasis RV Campground Onawa |
25 | 2 | 0 |
About this data
Water systems are matched to Monona 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.