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
301–325 of 498Fairbank Water Supply
IA1025031 · 1,111 served
Conrad Water Supply
IA3809067 · 1,098 served
Panora Water Works
IA3971026 · 1,091 served
George Water Supply
IA6028081 · 1,082 served
Marcus Water Supply
IA1838032 · 1,079 served
Sidney Water Supply
IA3661048 · 1,077 served
Van Meter Municipal Water Work
IA2570046 · 1,074 served
Rockwell Water Supply
IA1773097 · 1,071 served
Elk Run Heights Water Supply
IA0721014 · 1,069 served
North English Water Department
IA4858070 · 1,065 served
Riverside Water Supply
IA9260090 · 1,060 served
Treynor Water Department
IA7866031 · 1,049 served
Malvern Water Supply
IA6545020 · 1,046 served
Sloan Water Supply
IA9780059 · 1,042 served
Clarence Water Supply
IA1630028 · 1,039 served
Dunlap Water Supply
IA4316087 · 1,035 served
Winfield Muni Water Dept
IA4493028 · 1,035 served
Janesville Water Supply
IA0932001 · 1,034 served
Autumn Ridge Estates Mhp
IA7709601 · 1,032 served
Mechanicsville Water Dept
IA1667076 · 1,020 served
Tabor Water Supply
IA3667012 · 1,014 served
Griswold Water Supply
IA1528010 · 1,008 served
Eagle Ridge
IA5751602 · 1,005 served
Baxter Water Supply
IA5003091 · 1,002 served
Paullina Municipal Water Supply
IA7139032 · 996 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