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
201–225 of 498Sigourney Muni Water Works
IA5475050 · 2,004 served
Poweshiek Water Association (cr)
IA5715702 · 2,000 served
Denver Water Supply
IA0915030 · 1,919 served
New London Munic Water Dept
IA4458060 · 1,910 served
Dallas Center Water Supply
IA2520098 · 1,901 served
Pocahontas Water Department
IA7633049 · 1,877 served
Durant Water Supply
IA1636090 · 1,871 served
Columbus Junction Water Supply
IA5815064 · 1,830 served
Leon Water Supply
IA2742076 · 1,830 served
Guttenberg Water Utility
IA2242018 · 1,817 served
Stuart Water Supply
IA0180001 · 1,814 served
Park View Village
IA7736301 · 1,800 served
Farley Water Supply
IA3135018 · 1,766 served
Lyon-sioux Rws-doon
IA6000733 · 1,765 served
Ponderosa Utilities Inc.
IA7950300 · 1,750 served
Corning Muni Water Department
IA0220075 · 1,735 served
Lake City Water Supply
IA1345043 · 1,731 served
West Central Rwa-boyer System
IA1400903 · 1,715 served
Sirwa #1 (greenfield)
IA0140701 · 1,712 served
Manson Water Supply
IA1351027 · 1,709 served
Prairie City Water Works
IA5064055 · 1,703 served
Avoca Water Works
IA7803080 · 1,697 served
Mediapolis Water Supply
IA2948062 · 1,688 served
Moville Water Supply
IA9753022 · 1,687 served
Mount Ayr Water Treatment Plant
IA8055014 · 1,683 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