Iowa
Winneshiek County drinking water quality
43 active public water systems serve 14,742 people in Winneshiek County. 31 are compliant, 12 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 1 carries a health flag.
Needs attention
Community water systems
13 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Decorah Water Department Decorah |
7,615 | 0 | 0 | |
|
Calmar Water Supply Calmar |
1,125 | 0 | 0 | |
|
Ossian Water Supply Ossian |
802 | 1 | 0 | |
|
Freeport Water District Decorah |
775 | 0 | 0 | |
|
Spillville Water Supply Spillville |
371 | 0 | 0 | |
|
Fort Atkinson Water Works Fort Atkinson |
347 | 0 | 0 | |
|
Ridgeway, City of Ridgeway |
275 | 1 | 0 | |
|
Castalia Water Works Castalia |
145 | 0 | 0 | |
|
Frankville Rwd Frankville |
135 | 0 | 0 | |
|
Scenic View Estates Decorah |
78 | 0 | 0 | |
|
Sherman Place Water & Road, Inc. Decorah |
73 | 0 | 0 | |
|
Plantation Country View Subdivision Ridgeway |
32 | 0 | 0 | |
|
Deerfield Heights Association Decorah |
28 | 0 | 0 |
Non-community systems (30: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (41, 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.