Iowa
Monona County drinking water quality
14 active public water systems serve 6,465 people in Monona County. 6 are compliant, 8 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
8 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Onawa Municipal Water Plant Onawa |
2,906 | 0 | 0 | |
|
Mapleton Municipal Water Plant Mapleton |
1,124 | 1 | 0 | |
|
Whiting Water Supply Whiting |
727 | 0 | 0 | |
|
Ute Water Supply Ute |
338 | 4 | 0 | |
|
Blencoe Municipal Waterworks Blencoe |
224 | 0 | 0 | |
|
Moorhead Water Supply Moorhead |
189 | 2 | 0 | |
|
Soldier Water Supply Soldier |
180 | 2 | 0 | |
|
Castana Municipal Water Supply Castana |
103 | 0 | 0 |
Non-community systems (6: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Onawa KOA Onawa |
250 | 1 | 0 | |
|
Timber Ridge Lodge Recreation, Ltd. Castana |
250 | 0 | 0 | |
|
Lewis and Clark State Park Onawa |
67 | 2 | 1 | |
|
Divide Hill Bar & Grill Castana |
50 | 1 | 1 | |
|
Peters Park Rodney |
32 | 0 | 0 | |
|
Sunset at the Oasis RV Campground Onawa |
25 | 2 | 0 |
Inactive systems (34, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.