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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
476–498 of 498Val Vista Estates
IA7727607 · 553 served
Terrace Heights
IA3126604 · 548 served
Anthon Municipal Water System
IA9704060 · 545 served
Delmar Water Supply
IA2328024 · 542 served
Richland Water Supply
IA5470083 · 542 served
Zearing Water Department
IA8590041 · 528 served
Sunset Village
IA6469601 · 528 served
Dows Water Supply
IA9921050 · 526 served
Arcadia Water Supply
IA1403062 · 525 served
Truro Waterworks
IA6167036 · 525 served
Wyoming Water System
IA5396039 · 523 served
Charter Oak Water Supply
IA2417018 · 522 served
Whittemore Muni Water Supply
IA5595020 · 522 served
Ripleys Mhc Ia Llc
IA7000600 · 520 served
Ellsworth Public Water Supply
IA4009016 · 514 served
Ainsworth Water Works
IA9203007 · 511 served
Titonka Water Supply
IA5588026 · 511 served
Rolfe Water Supply
IA7639002 · 509 served
Sabula Water Supply
IA4975014 · 506 served
Elma Water Supply
IA4525017 · 505 served
Collins Water Supply
IA8515060 · 505 served
Scranton Water System
IA3759031 · 504 served
Breda Water Supply
IA1409041 · 502 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