Revised Total Coliform Rule (RTCR) violations in Iowa
341 active public water systems in Iowa had a Revised Total Coliform Rule (RTCR) violation in the past three years, 58 of them in the latest quarter of EPA's data. What Revised Total Coliform Rule (RTCR) is and why it matters.
Health effects: Total coliform bacteria indicate that the disinfection barrier has been breached or fecal contamination is entering the system. E. coli specifically indicates fecal contamination and the possible presence of disease-causing pathogens (norovirus, Salmonella, Shigella, Campylobacter). Illness can be severe in elderly, young children, and immunocompromised individuals.
Systems with a Revised Total Coliform Rule (RTCR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Whispering Maples Campground LLC Wapello · Louisa County |
27 | 2 | 2 | |
|
Windmill Ridge Campground Kalona · Washington County |
27 | 4 | 1 | |
|
Bennett Pk-Cedar Conservation Lowden · Cedar County |
25 | 3 | 2 | |
|
Eden Valley Refuge Maquoketa · Jackson County |
25 | 3 | 2 | |
|
Parkers Pit Stop Bellevue · Jackson County |
25 | 3 | 0 | |
|
The Balk Tank Lawler · Chickasaw County |
25 | 2 | 0 | |
|
Wildcat Bluff-Benton Conservation Center Point · Benton County |
25 | 1 | 0 | |
|
Winnebago CC Environmental Educ Center Leland · Winnebago County |
25 | 4 | 1 | |
|
Ames Water Treatment Plant Ames · Story County |
55,177 | 1 | 0 | |
|
Mason City Water Department Mason City · Cerro Gordo County |
27,338 | 1 | 0 | |
|
Shenandoah Water Dept Shenandoah · Page County |
4,933 | 1 | 0 | |
|
Sac & Fox (meskwaki) in Iowa County |
4,765 | 2 | 0 | |
|
Eagle Grove Water Supply Eagle Grove · Wright County |
3,601 | 1 | 0 | |
|
Southwest Reg Water District (red Oak) Red Oak · Montgomery County |
3,500 | 1 | 0 | |
|
Hudson Water Supply Hudson · Black Hawk County |
2,546 | 1 | 0 | |
|
Mitchellville Water Supply Mitchellville · Polk County |
2,515 | 4 | 1 | |
|
Postville Water Department Postville · Allamakee County |
2,513 | 2 | 0 | |
|
Lisbon Water Supply Lisbon · Linn County |
2,233 | 1 | 0 | |
|
Britt Water Works Britt · Hancock County |
2,064 | 2 | 0 | |
|
Dallas Center Water Supply Dallas Center · Dallas County |
1,901 | 1 | 0 | |
|
Reinbeck Water Supply Reinbeck · Grundy County |
1,662 | 1 | 0 | |
|
Traer Municipal Water Plant Traer · Tama County |
1,583 | 2 | 0 | |
|
Winnavegas Casino County |
1,576 | 2 | 0 | |
|
Clarinda Treatment Complex Clarinda · Page County |
1,439 | 2 | 0 | |
|
Mahaska Rural Water (new Sharon) New Sharon · Mahaska County |
1,368 | 1 | 0 | |
|
Laurens Water Supply Laurens · Pocahontas County |
1,301 | 1 | 0 | |
|
Lake Ridge, Incorporated Iowa City · Johnson County |
1,300 | 4 | 2 | |
|
Fayette Water Supply Fayette · Fayette County |
1,256 | 1 | 0 | |
|
Panora Water Works Panora · Guthrie County |
1,142 | 3 | 0 | |
|
Lake View Water Supply Lake View · Sac County |
1,133 | 2 | 0 | |
|
Fairbank Water Supply Fairbank · Buchanan County |
1,111 | 1 | 0 | |
|
Mechanicsville Water Dept Mechanicsville · Cedar County |
1,020 | 1 | 0 | |
|
DE Soto Water Supply De Soto · Dallas County |
960 | 3 | 1 | |
|
Hinton Water Supply Hinton · Plymouth County |
935 | 1 | 0 | |
|
Sioux Rapids Water Department Sioux Rapids · Buena Vista County |
932 | 3 | 2 | |
|
Eldon Water Supply Eldon · Wapello County |
927 | 1 | 0 | |
|
West Point Muni Water System West Point · Lee County |
921 | 1 | 0 | |
|
Modern Manor, INC Iowa City · Johnson County |
915 | 5 | 2 | |
|
Primghar Municipal Water Supply Primghar · O'Brien County |
902 | 1 | 0 | |
|
Victor Municipal Water Dept Victor · Iowa County |
875 | 1 | 0 | |
|
Coralville Lake-West Overlook Iowa City · Johnson County |
861 | 1 | 0 | |
|
Milo Public Water Supply Milo · Warren County |
788 | 1 | 0 | |
|
Western Hills (mobile) Estates Coralville · Johnson County |
760 | 3 | 1 | |
|
Manilla Muni Service Dept Manilla · Crawford County |
758 | 1 | 0 | |
|
Grand Jct Municipal Water Dept Grand Junction · Greene County |
725 | 2 | 0 | |
|
Oxford Water Supply Oxford · Johnson County |
722 | 3 | 0 | |
|
Hazleton Water Supply Hazleton · Buchanan County |
713 | 4 | 1 | |
|
Timberline Estates, Ltd. West Burlington · Des Moines County |
712 | 1 | 0 | |
|
Kinze Manufacturing INC Williamsburg · Iowa County |
710 | 1 | 0 | |
|
Coggon Water Department Coggon · Linn County |
701 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Revised Total Coliform Rule (RTCR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Revised Total Coliform Rule (RTCR) alone.
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.