Water Quality · District of Columbia
Best Water Quality Counties in District of Columbia 2026
Ranked by EPA drinking water health violations.
Top 10 — Water Quality in District of Columbia
Score reflects water quality only — not overall county quality.
All District of Columbia Counties — Water Quality Rankings
1 counties ranked by water quality score. Overall Score shown for context.
| # | County | Water Quality Score | Overall Score |
|---|---|---|---|
| 1 | District of Columbia, DC | 69.3 | 41.3 |