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
451–475 of 498Dumont Water Supply
IA1240081 · 635 served
Goldfield Water Supply
IA9937092 · 634 served
Elk Horn Muni Water Works
IA8325013 · 631 served
Sutherland Water Supply
IA7177007 · 629 served
Hopkinton Municipal Utilities
IA2835056 · 622 served
Agency Water Works
IA9003006 · 620 served
Doon Water Supply
IA6015047 · 619 served
Kellogg Water Supply
IA5038017 · 617 served
Grand Mound Water Supply
IA2341099 · 615 served
Moulton Water Department
IA0472012 · 607 served
Lyon-sioux Rws-boyden
IA6000744 · 605 served
Farmington Water Supply
IA8930038 · 601 served
Cedar Terrace Mhc
IA5700600 · 600 served
Brighton Municipal Water Supply
IA9209043 · 600 served
Keystone Water Supply
IA0640030 · 599 served
Minden Water Supply
IA7849086 · 598 served
Ireton Water Supply
IA8447098 · 590 served
Early Municipal Water Supply
IA8114000 · 587 served
Clermont Water Supply
IA3317047 · 586 served
Swea City Water Supply
IA5584009 · 584 served
Gilman Water Supply
IA6436087 · 582 served
Everly Water Supply
IA2115029 · 575 served
New Hartford Water Supply
IA1271058 · 570 served
Radcliffe Municipal Water
IA4283067 · 561 served
Badger Water Supply
IA9405082 · 561 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