Sewer overflows in District of Columbia
Sewer overflow record — reported spills, the worst utilities, and how often overflows reached waterways in District of Columbia.
Reported events
126
Total volume
245.5M gal
Reached waterways
0(0%)
Latest event
Jun 8, 2026
Worst utilities in District of Columbia
Ranked by number of reported overflow events.
| # | Utility | Events | Volume | Reached water |
|---|---|---|---|---|
| 1 | D.C. WASA Sanitary Sewer System | 126 | 245.5M gal | 0 |
Biggest spills in District of Columbia
The largest single reported overflow events.
- 242.0M galJan 19, 2026Reached Potomac River
- 1.0M galJul 21, 2023
- 1.0M galFeb 14, 2024
- 535K galFeb 9, 2026Reached Potomac River
- 292K galFeb 3, 2026Reached Potomac River
- 292K galFeb 3, 2026Reached Potomac River
- 61K galApr 1, 2025Reached Potomac River
- 23K galDec 6, 2025Reached Broad Branch
- 20K galNov 4, 2024
- 19K galFeb 2, 2026Reached Potomac River