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
401–425 of 498Garnavillo Water Supply
IA2234074 · 763 served
Alden Water Supply
IA4213013 · 763 served
Rockford Water Supply
IA3430091 · 762 served
Western Hills (mobile) Estates
IA5208600 · 760 served
Manilla Muni Service Dept
IA2436023 · 758 served
Morning Sun Water Department
IA5857011 · 752 served
Mcgregor Water Dept
IA2258012 · 747 served
Redfield Water Works
IA2564074 · 746 served
Blairstown Water Supply
IA0607013 · 738 served
Montrose Water Works
IA5650003 · 738 served
Schaller Water Supply
IA8156028 · 729 served
Hedrick Water Supply
IA5432042 · 728 served
Whiting Water Supply
IA6769018 · 727 served
Shelby Water Supply
IA8369038 · 727 served
Grand Jct Municipal Water Dept
IA3730098 · 725 served
Earlville Muni Water Supply
IA2825099 · 724 served
Essex Water Supply
IA7349023 · 722 served
Oxford Water Supply
IA5260017 · 722 served
Wellsburg Water Supply
IA3890097 · 721 served
Hospers Municipal Water Dept
IA8439058 · 718 served
Merrill Municipal Water Supply
IA7548072 · 717 served
Ventura Water Works
IA1785032 · 716 served
Hazleton Water Supply
IA1031044 · 713 served
Timberline Estates, Ltd.
IA2900626 · 712 served
Bancroft Water Supply
IA5507085 · 711 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