Safest Drinking Water in Iowa 2026
Iowa has 5 public water systems serving 697,604 people. The safest system is Iowa-American Wtr Co-Davenport in Davenport with a score of 100/100.
Top 5 Water Systems in Iowa
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Iowa-American Wtr Co-Davenport | Davenport | 147,720 | Surface water | 0 | A (100) |
| 2 | Ankeny, City Of | Ankeny | 76,207 | Surface water | 0 | A (100) |
| 3 | Cedar Rapids Water Department | Cedar Rapids | 141,831 | Ground water | 0 | B (82) |
| 4 | Des Moines Water Works | Des Moines | 246,055 | Surface water | 2 | D (60) |
| 5 | Sioux City Water Supply | Sioux City | 85,791 | Ground water | 10 | F (40) |
Water quality data for Iowa is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Iowa-American Wtr Co-Davenport in Davenport has the highest Water Safety Score in Iowa at 100/100 (Grade A), serving 147,720 people.
Iowa has 5 public water systems serving 697,604 people. The average Water Safety Score is 76/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).