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District of Columbia · EPA ECHO (national)

D.C. WASA Sanitary Sewer System

Permit DC0021199

—
No waterway impact reported
Reported events
126
Total volume
245.5M gal
Reached waterways
0 (0%)
Reporting since
2023

What caused the overflows

Grease / FOG
48
Equipment Failure
35
Other / Unknown
33
Root Intrusion
8
Rainfall / Flooding
2

Reported overflow events (showing 126 of 126)

DateVolumeCauseReached waterReceiving water
Jun 8, 2026100 galOther / Unknown—Broad Branch
May 30, 202650 galOther / Unknown—Broad Branch
May 28, 2026100 galEquipment Failure——
May 20, 202610K galGrease / FOG—Pope Branch
May 16, 202650 galOther / Unknown——
May 15, 2026550 galGrease / FOG——
May 4, 20262K galOther / Unknown—Potomac River
Apr 25, 20261K galGrease / FOG——
Apr 15, 202615K galRoot Intrusion—Potomac River
Mar 24, 2026500 galRoot Intrusion——
Mar 13, 2026200 galEquipment Failure——
Mar 9, 202610K galEquipment Failure——
Feb 16, 2026100 galGrease / FOG——
Feb 9, 2026535K galOther / Unknown—Potomac River
Feb 8, 20264K galOther / Unknown——
Feb 6, 2026300 galOther / Unknown——
Feb 5, 2026100 galOther / Unknown——
Feb 3, 2026292K galOther / Unknown—Potomac River
Feb 3, 2026292K galOther / Unknown—Potomac River
Feb 2, 202619K galOther / Unknown—Potomac River
Jan 19, 2026242.0M galOther / Unknown—Potomac River
Jan 3, 20265K galEquipment Failure——
Dec 29, 202550 galGrease / FOG——
Dec 24, 202550 galGrease / FOG——
Dec 19, 202550 galGrease / FOG——
Dec 6, 202523K galOther / Unknown—Broad Branch
Dec 1, 2025100 galOther / Unknown—ROCK CREEK
Dec 1, 202550 galEquipment Failure——
Dec 1, 20251K galOther / Unknown—Soapstone Stream
Nov 24, 20251 galEquipment Failure——
Nov 22, 2025100 galOther / Unknown——
Nov 18, 2025100 galGrease / FOG——
Nov 8, 20251K galGrease / FOG——
Nov 5, 2025600 galRoot Intrusion——
Nov 4, 20255K galRoot Intrusion——
Oct 29, 202520 galOther / Unknown——
Oct 29, 202580 galEquipment Failure——
Oct 20, 2025100 galOther / Unknown——
Oct 15, 202550 galOther / Unknown——
Oct 10, 202540 galGrease / FOG——
Sep 11, 20255K galOther / Unknown—Broad Branch
Sep 10, 2025500 galEquipment Failure—Potomac River
Sep 4, 202510K galOther / Unknown——
Aug 18, 20255K galEquipment Failure—Oxon Run
Aug 13, 20251K galEquipment Failure—Broad Branch
Jul 23, 2025242 galGrease / FOG——
Jul 20, 20256K galOther / Unknown—Anacostia River
Jul 18, 20251K galOther / Unknown—@PARK RD @PINEY BRANCH PKY NW
Jul 15, 202540 galRainfall / Flooding—Potomac River
Jul 11, 202510K galOther / Unknown——
Jun 17, 20255K galGrease / FOG—Watts Branch Creek
Jun 5, 2025500 galEquipment Failure——
May 28, 202510K galOther / Unknown——
May 16, 20256K galGrease / FOG—Hickory RUN
May 9, 202510K galGrease / FOG—Hickory Run
May 6, 2025500 galOther / Unknown——
May 6, 2025500 galGrease / FOG——
May 3, 2025500 galGrease / FOG—Potomac River
Apr 24, 20251K galEquipment Failure——
Apr 5, 20256K galGrease / FOG——
Apr 5, 20255K galEquipment Failure——
Apr 5, 2025100 galEquipment Failure—Rock Creek
Apr 1, 202561K galOther / Unknown—Potomac River
Feb 26, 202575 galEquipment Failure——
Jan 27, 2025330 galGrease / FOG——
Jan 16, 2025250 galEquipment Failure——
Jan 4, 202560 galRoot Intrusion——
Jan 1, 202525 galRoot Intrusion——
Dec 29, 202450 galEquipment Failure——
Dec 19, 202450 galEquipment Failure——
Nov 26, 202450 galGrease / FOG——
Nov 18, 20241K galGrease / FOG——
Nov 8, 202420 galGrease / FOG——
Nov 4, 202420K galGrease / FOG——
Oct 16, 2024750 galGrease / FOG——
Oct 11, 2024100 galGrease / FOG——
Sep 11, 2024296 galGrease / FOG——
Aug 21, 20245K galGrease / FOG——
Aug 9, 202460 galRainfall / Flooding——
Jul 11, 202412 galOther / Unknown——
Jul 8, 2024771 galGrease / FOG——
May 30, 202410 galOther / Unknown——
May 16, 202416K galEquipment Failure——
May 2, 202417 galEquipment Failure——
May 1, 202415 galGrease / FOG——
Apr 30, 2024150 galOther / Unknown——
Apr 29, 20246 galGrease / FOG——
Apr 18, 2024100 galEquipment Failure——
Apr 7, 202410 galGrease / FOG——
Apr 3, 20243K galGrease / FOG——
Apr 3, 202410K galRoot Intrusion——
Mar 20, 2024300 galGrease / FOG——
Feb 22, 2024600 galEquipment Failure——
Feb 14, 20241.0M galOther / Unknown——
Feb 8, 202420 galEquipment Failure——
Jan 12, 2024700 galGrease / FOG——
Jan 12, 202410K galGrease / FOG——
Dec 17, 202350 galRoot Intrusion——
Dec 12, 202310 galGrease / FOG——
Dec 8, 202375 galGrease / FOG——
Dec 2, 20231K galEquipment Failure——
Nov 21, 2023100 galGrease / FOG——
Nov 20, 20232K galGrease / FOG——
Oct 28, 2023100 galGrease / FOG——
Oct 6, 20231K galGrease / FOG——
Sep 29, 20235K galOther / Unknown——
Sep 22, 2023100 galGrease / FOG——
Sep 11, 202350 galEquipment Failure——
Aug 30, 20232K galGrease / FOG——
Aug 18, 20235K galEquipment Failure——
Aug 18, 20235K galEquipment Failure——
Aug 18, 202310K galEquipment Failure——
Aug 3, 202350 galGrease / FOG——
Jul 25, 2023200 galGrease / FOG——
Jul 21, 20231.0M galEquipment Failure——
Jul 6, 2023500 galEquipment Failure——
Jul 3, 2023150 galGrease / FOG——
Jun 11, 20232 galGrease / FOG——
Jun 6, 20235 galGrease / FOG——
Jun 6, 2023660 galOther / Unknown——
May 28, 2023100 galGrease / FOG——
May 20, 202310 galEquipment Failure——
May 19, 202320 galEquipment Failure——
May 8, 202350 galEquipment Failure——
Apr 22, 20232K galEquipment Failure——
Mar 31, 20231K galEquipment Failure——

Source: EPA ECHO (national). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.