State Hub
Iowa Water Quality
498
Utilities in database
2.9M
Residents served
35%
On private wells
2
Key contaminants tracked
Drinking Water in Iowa
Iowa has 498 community water systems serving approximately 2.9 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, arsenic. 35% of Iowa residents rely on private wells. DNR holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Iowa
376–400 of 498Lakeside Estates Llc
IA7812601 · 823 served
Midwest Country Estates
IA2573301 · 820 served
Riceville Water Supply
IA4558001 · 816 served
Adair Municipal Water Supply
IA0105002 · 809 served
Lowden Water Supply
IA1656001 · 807 served
Schleswig Munic Water Supply
IA2446029 · 803 served
Ossian Water Supply
IA9677007 · 802 served
Gladbrook Water Supply
IA8640089 · 799 served
Gilbertville Water Works
IA0733084 · 794 served
Milo Public Water Supply
IA9155083 · 788 served
Wall Lake Water Supply
IA8166061 · 780 served
Ruthven Water Supply
IA7465010 · 779 served
Van Horne Water Works
IA0685045 · 779 served
Crescent Water Supply
IA7822086 · 778 served
Okoboji Water Supply
IA3060091 · 776 served
Freeport Water District
IA9630001 · 775 served
Wheatland City Water Supply
IA2394017 · 775 served
Dayton Municipal Water Supply
IA9425011 · 772 served
West Bend Water Department
IA7470099 · 772 served
Dakota City Water Supply
IA4622095 · 769 served
Walnut Municipal Utilities
IA7872062 · 768 served
Carson Water Supply
IA7809078 · 766 served
Correctionville Water Supply
IA9721076 · 766 served
Melbourne Water Supply
IA6471063 · 765 served
Exira Water Dept
IA0520030 · 764 served
Key Contaminant Concerns in Iowa
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
Iowa Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 498 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22