All water systems in Iowa
1,804 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Carroll Municipal Water Supply Carroll · Carroll County |
10,321 | 0 | 0 | |
|
Keokuk Municipal Water Works Keokuk · Lee County |
9,900 | 0 | 0 | |
|
Fairfield Water Supply Fairfield · Jefferson County |
9,821 | 1 | 0 | |
|
Grinnell Water Department Grinnell · Poweshiek County |
9,564 | 2 | 0 | |
|
Bondurant Muni Water Supply Bondurant · Polk County |
9,393 | 0 | 0 | |
|
Denison Water Supply Denison · Crawford County |
9,381 | 0 | 0 | |
|
Mount Pleasant Municipal Utilities Mount Pleasant · Henry County |
9,274 | 0 | 0 | |
|
Iowa Lakes Regional Water Osgood Graettinger · Palo Alto County |
9,021 | 0 | 0 | |
|
Knoxville Water Works Knoxville · Marion County |
8,400 | 0 | 0 | |
|
Rathbun Reg Wtr Assn (burlington) Burlington · Des Moines County |
8,375 | 0 | 0 | |
|
Sioux Center Municipal Water Department Sioux Center · Sioux County |
8,231 | 0 | 0 | |
|
Perry Municipal Water Works Perry · Dallas County |
7,836 | 0 | 0 | |
|
Webster City Water Supply Webster City · Hamilton County |
7,825 | 0 | 0 | |
|
Clear Lake Water Department Clear Lake · Cerro Gordo County |
7,687 | 0 | 0 | |
|
Decorah Water Department Decorah · Winneshiek County |
7,615 | 0 | 0 | |
|
Tiffin Water Supply Tiffin · Johnson County |
7,577 | 0 | 0 | |
|
Southeast Polk Rwd Altoona · Polk County |
7,565 | 0 | 0 | |
|
Creston Water Supply Creston · Union County |
7,536 | 0 | 0 | |
|
Charles City Water Supply Charles City · Floyd County |
7,446 | 0 | 0 | |
|
Washington Water Department Washington · Washington County |
7,362 | 0 | 0 | |
|
Atlantic Municipal Utilities Atlantic · Cass County |
7,252 | 0 | 0 | |
|
Hiawatha Water Dept Hiawatha · Linn County |
7,183 | 0 | 0 | |
|
Osceola Rural Water System-North May City · Osceola County |
7,002 | 0 | 0 | |
|
Nevada Water Supply Nevada · Story County |
6,925 | 0 | 0 | |
|
Iowa Lakes Regional Water Spencer · Buena Vista County |
6,755 | 0 | 0 | |
|
Eldridge Water Supply Eldridge · Scott County |
6,726 | 1 | 0 | |
|
Polk City Water Supply Polk City · Polk County |
6,533 | 0 | 0 | |
|
Adel Municipal Water Works Adel · Dallas County |
6,461 | 0 | 0 | |
|
Orange City Municipal Water Department Orange City · Sioux County |
6,267 | 0 | 0 | |
|
Spirit Lake Waterworks Spirit Lake · Dickinson County |
6,167 | 0 | 0 | |
|
Maquoketa Municipal Water Maquoketa · Jackson County |
6,128 | 2 | 0 | |
|
Xenia Rwd (north) Stratford · Boone County |
6,122 | 0 | 0 | |
|
Independence Water Dept Independence · Buchanan County |
6,064 | 0 | 0 | |
|
Estherville Water Treatment Plant Estherville · Emmet County |
5,974 | 0 | 0 | |
|
Asbury Municipal Water System Asbury · Dubuque County |
5,943 | 0 | 0 | |
|
Oelwein Municipal Water Works Oelwein · Fayette County |
5,920 | 0 | 0 | |
|
Marion Co. Rural Water District Knoxville · Marion County |
5,687 | 2 | 1 | |
|
Red Oak Water Supply Red Oak · Montgomery County |
5,596 | 2 | 0 | |
|
DE Witt Water Supply De Witt · Clinton County |
5,514 | 0 | 0 | |
|
Sheldon Water Department Sheldon · O'Brien County |
5,512 | 0 | 0 | |
|
Osceola Water Works Osceola · Clarke County |
5,503 | 2 | 1 | |
|
Algona Municipal Utilities Algona · Kossuth County |
5,487 | 0 | 0 | |
|
Glenwood Municipal Utilities Glenwood · Mills County |
5,449 | 0 | 0 | |
|
Winterset Municipal Waterworks Winterset · Madison County |
5,428 | 0 | 0 | |
|
Southern Sioux County Rural Water Ireton · Sioux County |
5,420 | 0 | 0 | |
|
Centerville Municipal Waterworks Centerville · Appanoose County |
5,344 | 0 | 0 | |
|
Clarinda Water Plant Clarinda · Page County |
5,305 | 1 | 0 | |
|
Cherokee Water Supply Plant 1 Cherokee · Cherokee County |
5,199 | 0 | 0 | |
|
Iowa Falls Water Department Iowa Falls · Hardin County |
5,146 | 0 | 0 | |
|
Manchester Water Supply Manchester · Delaware County |
5,077 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
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.