Best Water Quality Counties in District of Columbia
EPA drinking water health violations and safety grades Compare rankings across all 1 counties.
All District of Columbia Counties Ranked
| # | County | Water Quality Score | Overall Score |
|---|---|---|---|
| 1 | District of Columbia, DC | 69.3 | 41.2 |
Data Source
Water Quality data from WaterByCounty. See full details at WaterByCounty. Data updated February 2026.