District of Columbia drinking water quality
District of Columbia has 14 active public water systems serving 672K people. 11 of them, 79%, had at least one EPA violation in the past three years, 8 have an unresolved violation today, and 5 are designated serious violators by the EPA.
Largest counties
All 1 counties| County | People served | Systems | With violations |
|---|---|---|---|
| District of Columbia | 669,784 | 5 | 3 |
Largest community water systems
All 14 systems| System | Serves | Status |
|---|---|---|
| D.c. Water and Sewer Authority District of Columbia |
632,323 | |
| Joint Base Anacostia Bolling District of Columbia |
20,411 | |
| Naval Station Washington Wny District of Columbia |
16,800 | |
| Fort Wingate Community |
550 | |
| Washington Aqueduct Division. District of Columbia |
0 |
About this data
Totals cover active systems. A system counts as having violations if any rule was in violation in the past three years, including monitoring and reporting lapses. Coordinates are not available for most District of Columbia systems, so results are ordered by people served rather than distance.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The District of Columbia records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.