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
251–275 of 498Rathbun Regional Water (mount Pleasant)
IA4453901 · 1,465 served
Cherokee Rws- Mill Creek Subsystem
IA1800900 · 1,451 served
Earlham Municipal Waterworks
IA6115097 · 1,446 served
Clarinda Treatment Complex
IA7329501 · 1,439 served
State Center Muni Water Dept
IA6484093 · 1,411 served
Palo Water Supply
IA5765101 · 1,407 served
Logan Water Supply
IA4337092 · 1,397 served
Kingsley Water Supply
IA7537032 · 1,396 served
Roland Water Supply
IA8570001 · 1,394 served
Sanborn Water Supply
IA7165025 · 1,392 served
Manning Water Supply
IA1457025 · 1,392 served
Sirwa #3 (leon)
IA2718755 · 1,373 served
Nora Springs Water Supply
IA3423069 · 1,369 served
Mahaska Rural Water (new Sharon)
IA6264063 · 1,368 served
Lone Tree Muni Water System
IA5240095 · 1,357 served
Woodward Water Supply
IA2576036 · 1,346 served
Lenox Water Supply
IA8748075 · 1,339 served
Dike Water Supply
IA3815042 · 1,306 served
Laurens Water Supply
IA7614063 · 1,301 served
Lake Ridge, Incorporated
IA5225315 · 1,300 served
Coon Rapids Municipal Utilities
IA1427070 · 1,300 served
Dysart Water Supply
IA8627095 · 1,281 served
Shell Rock Muni Water Supp
IA1286042 · 1,269 served
Manly Water Supply
IA9845024 · 1,266 served
Central City Water Supply
IA5720010 · 1,264 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