Safest Drinking Water in Missouri 2026
Missouri has 5 public water systems serving 2,266,661 people. The safest system is Mo American St Louis St Charles Counties in Chesterfield with a score of 100/100.
Top 5 Water Systems in Missouri
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Mo American St Louis St Charles Counties | Chesterfield | 1,111,000 | Surface water | 0 | A (100) |
| 2 | City of Columbia Utilities | Columbia | 126,254 | Ground water | 0 | B (88) |
| 3 | Springfield Pws | Springfield | 210,898 | Surface water | 0 | B (86) |
| 4 | St Louis City Pws | St Louis | 304,709 | Surface water | 0 | B (80) |
| 5 | Kansas City Pws | Kansas City | 513,800 | Surface water | 1 | C (78) |
Water quality data for Missouri is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Mo American St Louis St Charles Counties in Chesterfield has the highest Water Safety Score in Missouri at 100/100 (Grade A), serving 1,111,000 people.
Missouri has 5 public water systems serving 2,266,661 people. The average Water Safety Score is 86/100.
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.