Colorado Water Quality Ratings
TapWaterSafety has rated 27 public water systems in Colorado, serving a combined 6,183,574 residents. The statewide average grade is D.
State average grade
D
Total utilities rated
27
Population served
6,183,574
Most recent test
2024
Top water quality concerns in Colorado
- Haloacetic acids (HAA9) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
- PFAS contamination
- Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Cities in Colorado
Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.
Grade distribution
All rated utilities in Colorado
Sorted by score, highest first. Click any utility to see the full grade card.