12 Iowa water districts with results read from their own annual water quality report or EPA testing, largest first.
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- West Des Moines Water Works68,723 people · 2 results
- Council Bluffs Water Works64,447 people · 7 results
- Dubuque Water Works59,667 people · 10 results
- Ames Water Treatment Plant55,177 people · 6 results
- Cedar Falls Municipal Water Utilities40,713 people · 17 results
- Isu36,822 people · 11 results
- Rathbun Regional Water Assn (Rathbun)32,000 people · 8 results
- Mason City Water Department27,338 people · 7 results
- University Water System26,684 people · 10 results
- Fort Dodge Water Supply25,874 people · 8 results
- Johnston Municipal Water Supply24,064 people · 10 results
- Coralville Muni Water System22,318 people · 10 results