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
276–300 of 498Fayette Water Supply
IA3342041 · 1,256 served
Clarksville Water Supply
IA1228038 · 1,254 served
Alton Municipal Water Department
IA8403029 · 1,248 served
Amana Society Water System North
IA4848001 · 1,248 served
Anamosa State Penitentiary
IA5300947 · 1,230 served
Elkader Muni Water Dept
IA2223011 · 1,219 served
Jewell Water Supply
IA4027010 · 1,216 served
Melcher-dallas Water Supply
IA6300099 · 1,213 served
Gilbert Water Supply
IA8531083 · 1,211 served
Tripoli Water Supply
IA0975032 · 1,191 served
Lyon-sioux Rws-rock Rapids
IA6000800 · 1,187 served
Buffalo Water Supply
IA8218050 · 1,176 served
Camp Dodge Water Supply
IA7700901 · 1,169 served
Lake Park Municipal Utilities
IA3045046 · 1,167 served
Springville Water Supply
IA5782087 · 1,164 served
St Ansgar Water Supply
IA6673016 · 1,161 served
Strawberry Point Water Supply
IA2279003 · 1,155 served
Glidden Water Supply
IA1438091 · 1,140 served
Lake View Water Supply
IA8127048 · 1,133 served
Villisca Municipal Water Dept
IA6985051 · 1,132 served
Sheffield Water Supply
IA3570037 · 1,130 served
Aplington Water Supply
IA1207061 · 1,126 served
Calmar Water Supply
IA9615064 · 1,125 served
Mapleton Municipal Water Plant
IA6727028 · 1,124 served
Arnolds Park Water Department
IA3003067 · 1,113 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