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
76–100 of 498Polk City Water Supply
IA7770050 · 6,533 served
Adel Municipal Water Works
IA2503003 · 6,461 served
Orange City Municipal Water Department
IA8474097 · 6,267 served
Spirit Lake Waterworks
IA3070078 · 6,167 served
Maquoketa Municipal Water
IA4950029 · 6,128 served
Xenia Rwd (north)
IA9425701 · 6,122 served
Independence Water Dept
IA1037070 · 6,064 served
Asbury Municipal Water System
IA3102001 · 5,943 served
Oelwein Municipal Water Works
IA3353088 · 5,920 served
Estherville Water Treatment Plant
IA3218024 · 5,904 served
Marion Co. Rural Water District
IA6342711 · 5,687 served
Red Oak Water Supply
IA6950075 · 5,596 served
De Witt Water Supply
IA2330036 · 5,514 served
Sheldon Water Department
IA7170040 · 5,512 served
Osceola Water Works
IA2038038 · 5,503 served
Algona Municipal Utilities
IA5502015 · 5,487 served
Glenwood Municipal Utilities
IA6525090 · 5,449 served
Winterset Municipal Waterworks
IA6171029 · 5,428 served
Southern Sioux County Rural Water
IA8400733 · 5,420 served
Centerville Municipal Waterworks
IA0407008 · 5,344 served
Cherokee Water Supply - Plant 1
IA1811020 · 5,199 served
Iowa Falls Water Department
IA4260097 · 5,146 served
Manchester Water Supply
IA2839021 · 5,077 served
Harlan Municipal Utilities
IA8335029 · 5,067 served
Sergeant Bluff Water Supply
IA9774033 · 5,015 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