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
126–150 of 498Emmetsburg Municipal Water Department
IA7428021 · 3,733 served
West Burlington Muni. Water Supply
IA2985002 · 3,728 served
Albia Municipal Water Works
IA6803010 · 3,721 served
Osage Municipal Water Supply
IA6663001 · 3,637 served
Eagle Grove Water Supply
IA9926096 · 3,601 served
West Central Rwa - Nish System
IA1400902 · 3,573 served
Southwest Reg Water District (red Oak)
IA6950701 · 3,500 served
New Hampton Water Supply
IA1970051 · 3,494 served
Xenia Rwd (woodward)
IA2576705 · 3,465 served
Milford Municipal Utilities
IA3050079 · 3,431 served
Rural Water System #1
IA8400722 · 3,428 served
Story City Water Dept
IA8584000 · 3,357 served
Williamsburg Public Water Supply
IA4884023 · 3,345 served
Cherokee Rws - Cherokee Subsystem
IA1811001 · 3,315 served
Tipton Water Supply
IA1689022 · 3,149 served
Tama Water Supply
IA8670013 · 3,130 served
Madrid Water Department
IA0848015 · 3,090 served
Garner Water Works
IA4130075 · 3,065 served
Solon Water Dept
IA5282062 · 3,018 served
Southwest Reg Water District (clarinda)
IA7383901 · 2,942 served
Wilton Water Supply
IA7078026 · 2,924 served
Onawa Municipal Water Plant
IA6739095 · 2,906 served
Lake Panorama Water Company
IA3900301 · 2,900 served
Sibley Public Water Supply
IA7245047 · 2,860 served
Fairfax Water Supply
IA5731032 · 2,828 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