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
351–375 of 498Modern Manor, Inc
IA5225601 · 915 served
Le Grand Water Works
IA6457070 · 910 served
Neola Light & Water
IA7853043 · 906 served
Newell Water Treatment Plant
IA1155049 · 906 served
Primghar Municipal Water Supply
IA7155059 · 902 served
Sully Muni Water Works
IA5076005 · 900 served
Keota Water Dept
IA5440028 · 897 served
Graettinger Municipal Water Supply
IA7445096 · 897 served
Hamburg Water Supply
IA3621023 · 890 served
Donnellson Muni Water Works
IA5620046 · 885 served
Elkhart Water Supply
IA7730012 · 882 served
Newhall Water Supply
IA0653050 · 881 served
Armstrong Water Supply
IA3203066 · 875 served
Victor Municipal Water Dept
IA4875050 · 875 served
Hills Water Supply
IA5221001 · 863 served
Hubbard Water Supply
IA4254061 · 860 served
Maxwell Water Department
IA8557058 · 859 served
Buffalo Center Muni Water Dept
IA9506052 · 857 served
Colo Water Supply
IA8520061 · 853 served
Marion Village
IA5751601 · 850 served
Readlyn Water Supply
IA0965073 · 845 served
Dunkerton Muni Water Supply
IA0717084 · 842 served
Winthrop Water Supply
IA1093031 · 840 served
Long Grove Muni Water Supply
IA8251096 · 838 served
Cambridge Water Supply
IA8509069 · 832 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