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
176–200 of 498Belle Plaine Water Dept
IA0610099 · 2,380 served
Bellevue Municipal Utilities
IA4910000 · 2,363 served
Ely Water Supply
IA5728018 · 2,328 served
Colfax Water Supply
IA5009056 · 2,305 served
La Porte City Utilities
IA0743057 · 2,284 served
Peosta Water Supply
IA3170001 · 2,278 served
Rockwell City Water Supply
IA1376098 · 2,250 served
Lisbon Water Supply
IA5748086 · 2,233 served
Rock Valley Rural Water District
IA8482701 · 2,230 served
Greenfield Municipal Utilities
IA0140007 · 2,227 served
Lake Mills Municipal Water Dept-south
IA9545044 · 2,158 served
Osceola Rural Water System-south
IA7177701 · 2,112 served
Wapello Municipal Water Works
IA5879063 · 2,096 served
Sac City Municipal Water Plant
IA8150015 · 2,093 served
Alta Municipal Water Plant
IA1108025 · 2,087 served
Northwood Waterworks
IA9855077 · 2,072 served
Britt Water Works
IA4103045 · 2,064 served
Atkins Municipal Water Works
IA0603072 · 2,056 served
Audubon Water Supply
IA0505077 · 2,053 served
Ida Grove Water Utility
IA4728067 · 2,051 served
Sumner Water Supply
IA0970006 · 2,030 served
Lamoni Municipal Utilities
IA2740050 · 2,029 served
Epworth Water Supply
IA3133033 · 2,023 served
Parkersburg Water Supply
IA1281028 · 2,019 served
Monroe Water Supply
IA5054096 · 2,007 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