District of Columbia tap water quality
10 active community water systems.
Largest water systems
| Grade | System | People | Health violations (5y) |
|---|---|---|---|
| A | DC Water | 632,323 | 0 |
| C | Joint Base Anacostia - Bolling | 20,411 | 2 |
| D | Naval Station Washington - Wny | 16,800 | 3 |
| C | Wingate Elementary School (New) - Bie | 800 | 2 |
| D | Fort Wingate Community | 550 | 5 |
| D | Eastern Navajo Agency - Bie | 455 | 6 |
| A | Bie Chemawa Indian School | 320 | 0 |
| C | Dibe Yazhi Habitiin (Borrego Pass) Day School-Bie | 120 | 3 |
| C | Hanaadli Huerfano Boarding School - Bie | 65 | 1 |
| A | Washington Aqueduct Division. | 0 | 0 |
Most issues (systems serving 10,000+)
D
Naval Station Washington - Wny
Serves 16,800 people · Surface water · Full report →
3 health-based violations in the last 5 years; 7 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
C
Joint Base Anacostia - Bolling
Serves 20,411 people · Surface water · Full report →
2 health-based violations in the last 5 years; 25 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
DC Water
Serves 632,323 people · Surface water · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2026).
Cities
Borrego Pass SchoolCrownpoint BiaFort WingateFt. Wingate Elementary SchoolHuerfano Boarding SchoolNaval Anacost AnnexSalemWashingtonWashington Navy Yard