Hi there, your free Coralville water report

Coralville Municipal Water System · Iowa River alluvial wells (groundwater under influence of surface water). Your water meets federal legal limits — but those limits haven't been updated in nearly 20 years.

Above health guidelines

242x

TTHMs vs. guideline

189x

Bromodichloromethane vs. guideline

Bottom line: 12 contaminants came back above the latest health guidelines — led by farm-runoff nitrate, chlorination byproducts and radium. The good news: the right system reduces all of them.

Detected above health-based guidelines

Level found vs. a non-enforceable, health-based guideline. Detection data comes from public Iowa DNR & U.S. EPA testing records (2021–2023); health guidelines are drawn from state public-health authorities (such as California's OEHHA) and peer-reviewed research, and are far stricter than federal legal limits. Water that exceeds a health guideline can still meet all legal standards.

Total trihalomethanes (TTHMs) · disinfection byproduct

36.3 ppb detected · guideline 0.15 ppb · legal limit 80 ppb

242x

Bromodichloromethane · disinfection byproduct

11.4 ppb detected · guideline 0.06 ppb · no legal limit

189x

Haloacetic acids (HAA9) · disinfection byproduct

8.39 ppb detected · guideline 0.06 ppb · no legal limit

140x

Dibromochloromethane · disinfection byproduct

13.8 ppb detected · guideline 0.1 ppb · no legal limit

138x

Dibromoacetic acid · disinfection byproduct

3 ppb detected · guideline 0.03 ppb · no legal limit

100x

+ 7 more · Haloacetic acids, Radium, Chloroform, Dichloroacetic acid…

5–30x

Recommended for your home: Whole-Home Softener + Reverse Osmosis

A whole-home softener handles Iowa's hard water and protects your plumbing; 7-stage reverse osmosis at your kitchen tap is one of the most effective ways to reduce the contaminants above.

Helps reduce:✓ Nitrate✓ Disinfection byproducts✓ Radium✓ Hard-water scale

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Based on publicly available drinking-water testing data from the Iowa Department of Natural Resources and the U.S. Environmental Protection Agency (detections 2021–2023; radiologicals 2018–2023). Levels are utility-wide annual averages and meet federal legal limits; 'health-based guideline' refers to non-enforceable health goals set by federal or state public-health authorities. Informational only — not a medical or safety determination. Your home's water, especially on a private well, may differ; a free in-home test measures your actual water.