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%).
The this entity category groups every U.S. public drinking-water safety entity sharing this attribute. The list above is the data; the paragraphs below explain what the grouping means against the broader the EPA Safe Drinking Water Information System (SDWIS) distribution and how to read the relative rankings within the category.
For readers using this category as a starting point, the per-entity detail pages linked from the table above carry the underlying the EPA Safe Drinking Water Information System (SDWIS) data in full. The category-level view is the filter; the per-entity pages are the actual answer.
Source: EPA Ground Water and Drinking Water, 2026.