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
226–250 of 498Remsen Municipal Utilities
IA7568079 · 1,678 served
Pleasantville Water Works
IA6377046 · 1,676 served
Reinbeck Water Supply
IA3870073 · 1,662 served
Granger Muni Water Supply
IA2537001 · 1,654 served
Xenia Rwd (madrid)
IA0848701 · 1,635 served
Woodbine Water Department
IA4388034 · 1,622 served
Corydon Water Supply
IA9334078 · 1,610 served
Hartley Municipal Water Department
IA7128036 · 1,605 served
Ackley Municipal Water Works
IA4201001 · 1,599 served
Guthrie Center Muni Water Work
IA3937016 · 1,593 served
Traer Municipal Water Plant
IA8681030 · 1,583 served
Urban Bluffs - North
IA7820701 · 1,558 served
City of Akron
IA7509008 · 1,558 served
Urbana Water Supply
IA0680041 · 1,554 served
Walcott Waterworks
IA8285058 · 1,551 served
Nashua Water Supply
IA1967041 · 1,551 served
Slater Muni Water Dept
IA8580057 · 1,548 served
Montezuma Muni Water Supply
IA7950097 · 1,545 served
Lyon-sioux Rws-big Sioux
IA6000755 · 1,530 served
Oakland Munic Water Utility
IA7856084 · 1,524 served
Wellman Municipal Waterworks
IA9276096 · 1,524 served
Bedford Water Works
IA8709096 · 1,508 served
Brooklyn Water Department
IA7909047 · 1,505 served
City of Holstein
IA4721054 · 1,501 served
Monona Municipal Water Dept
IA2264095 · 1,471 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