All rankings
Maryland · Maryland (MDE)
Back River WWTP
Permit N/A
—
No waterway impact reported
Reported events
1,358
Total volume
183.4M gal
Reached waterways
0 (0%)
Reporting since
2005
What caused the overflows
Grease / FOG
327
Other / Unknown
273
Rainfall / Flooding
148
Root Intrusion
134
Equipment Failure
118
Reported overflow events (showing 200 of 1,358)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Jun 22, 2026 | — | Other / Unknown | — | none |
| Jun 11, 2026 | 20.0M gal | Other / Unknown | — | none |
| May 24, 2026 | 16.0M gal | Other / Unknown | — | — |
| Apr 20, 2026 | 10K gal | Other / Unknown | — | none |
| Apr 3, 2026 | 10.0M gal | Other / Unknown | — | Back River, but partially treated |
| Apr 1, 2026 | 7.9M gal | Other / Unknown | — | none |
| Apr 1, 2026 | 1 gal | Other / Unknown | — | none |
| Feb 25, 2026 | 578K gal | Other / Unknown | — | Back River |
| Feb 24, 2026 | 9.0M gal | Other / Unknown | — | None |
| Feb 22, 2026 | 750K gal | Other / Unknown | — | Back River |
| Feb 20, 2026 | 39.0M gal | Other / Unknown | — | Back River |
| Feb 15, 2026 | 29.0M gal | Other / Unknown | — | Back River |
| Feb 15, 2026 | 23.0M gal | Other / Unknown | — | Back River |
| Feb 10, 2026 | 10K gal | Other / Unknown | — | ground |
| Feb 10, 2026 | 27K gal | Other / Unknown | — | Stormwater Retention Pond |
| Feb 5, 2026 | 23K gal | Other / Unknown | — | freezing water leak from a pump onto the premises around the adjacent area |
| Dec 19, 2025 | 1.2M gal | Other / Unknown | — | Controlled Bypass |
| Jul 16, 2025 | 5.3M gal | Other / Unknown | — | none |
| Jul 8, 2025 | 3.3M gal | Other / Unknown | — | None |
| Jul 3, 2025 | 1K gal | Other / Unknown | — | It is estimated that 1,000 gallons escaped and rested on the concrete digester lid and adjacent grassy area, but it was contained by a silt fence along the side of the digester. |
| Jul 1, 2025 | 13.1M gal | Other / Unknown | — | Back River |
| Jun 24, 2025 | 1K gal | Other / Unknown | — | Spillway |
| May 29, 2025 | 4K gal | Other / Unknown | — | storm drain |
| May 14, 2025 | 96K gal | Other / Unknown | — | storm drain |
| May 14, 2025 | 0 gal | Other / Unknown | — | none |
| Mar 3, 2025 | 400 gal | Other / Unknown | — | none |
| Feb 17, 2025 | 500 gal | Other / Unknown | — | N/A |
| Feb 8, 2025 | 700 gal | Other / Unknown | — | N/A |
| Feb 3, 2025 | 10K gal | Other / Unknown | — | N/A |
| Jan 28, 2025 | 10K gal | Other / Unknown | — | storm drain |
| Mar 13, 2024 | 23K gal | Other / Unknown | — | Back River |
| Mar 1, 2024 | 250 gal | Other / Unknown | — | N/A |
| Jan 28, 2024 | 10K gal | Other / Unknown | — | n/a |
| Jan 9, 2024 | 10K gal | Other / Unknown | — | n/a |
| Jan 9, 2024 | 10K gal | Other / Unknown | — | n/a |
| Dec 11, 2023 | 5.0M gal | Other / Unknown | — | Back River |
| Mar 25, 2023 | 300 gal | Other / Unknown | — | N/A |
| Jul 15, 2021 | — | Other / Unknown | — | — |
| Mar 24, 2021 | — | Other / Unknown | — | — |
| Aug 4, 2020 | — | Rainfall / Flooding | — | — |
| Jul 1, 2020 | — | Equipment Failure | — | — |
| Apr 18, 2020 | — | Other / Unknown | — | — |
| Jan 10, 2020 | — | Equipment Failure | — | — |
| Sep 16, 2018 | — | Equipment Failure | — | — |
| Jun 12, 2018 | — | Other / Unknown | — | — |
| May 3, 2018 | — | Equipment Failure | — | — |
| Mar 26, 2018 | — | Other / Unknown | — | — |
| Nov 17, 2017 | — | Other / Unknown | — | — |
| Oct 26, 2017 | — | Equipment Failure | — | — |
| Oct 26, 2017 | — | Equipment Failure | — | — |
| Oct 15, 2017 | — | Grease / FOG | — | — |
| Sep 29, 2017 | — | Equipment Failure | — | — |
| Aug 30, 2017 | — | Root Intrusion | — | — |
| May 26, 2017 | — | Other / Unknown | — | — |
| Jan 23, 2017 | — | Equipment Failure | — | — |
| Jan 23, 2017 | — | Equipment Failure | — | — |
| Jan 14, 2017 | — | Grease / FOG | — | — |
| Nov 26, 2013 | — | Rainfall / Flooding | — | — |
| Nov 21, 2013 | — | Root Intrusion | — | — |
| Nov 10, 2013 | — | Other / Unknown | — | — |
| Nov 6, 2013 | — | Grease / FOG | — | — |
| Nov 6, 2013 | — | Grease / FOG | — | — |
| Nov 5, 2013 | — | Other / Unknown | — | — |
| Nov 2, 2013 | — | Root Intrusion | — | — |
| Oct 29, 2013 | — | Other / Unknown | — | — |
| Oct 28, 2013 | — | Other / Unknown | — | — |
| Oct 15, 2013 | — | Root Intrusion | — | — |
| Oct 13, 2013 | — | Grease / FOG | — | — |
| Oct 11, 2013 | — | Rainfall / Flooding | — | — |
| Oct 11, 2013 | — | Rainfall / Flooding | — | — |
| Oct 4, 2013 | — | Grease / FOG | — | — |
| Oct 2, 2013 | — | Root Intrusion | — | — |
| Sep 26, 2013 | — | Grease / FOG | — | — |
| Sep 16, 2013 | — | Grease / FOG | — | — |
| Sep 13, 2013 | — | Grease / FOG | — | — |
| Sep 13, 2013 | — | Grease / FOG | — | — |
| Sep 10, 2013 | — | Root Intrusion | — | — |
| Sep 9, 2013 | — | Grease / FOG | — | — |
| Aug 25, 2013 | — | Other / Unknown | — | — |
| Aug 19, 2013 | — | Grease / FOG | — | — |
| Aug 19, 2013 | — | Other / Unknown | — | — |
| Aug 19, 2013 | — | Other / Unknown | — | — |
| Aug 15, 2013 | — | Other / Unknown | — | — |
| Aug 13, 2013 | — | Grease / FOG | — | — |
| Aug 12, 2013 | — | Other / Unknown | — | — |
| Aug 6, 2013 | — | Root Intrusion | — | — |
| Aug 5, 2013 | — | Root Intrusion | — | — |
| Aug 3, 2013 | — | Other / Unknown | — | — |
| Aug 1, 2013 | — | Equipment Failure | — | — |
| Jul 30, 2013 | — | Other / Unknown | — | — |
| Jul 29, 2013 | — | Grease / FOG | — | — |
| Jul 27, 2013 | — | Grease / FOG | — | — |
| Jul 24, 2013 | — | Other / Unknown | — | — |
| Jul 24, 2013 | — | Grease / FOG | — | — |
| Jul 23, 2013 | — | Root Intrusion | — | — |
| Jul 22, 2013 | — | Other / Unknown | — | — |
| Jul 19, 2013 | — | Other / Unknown | — | — |
| Jul 19, 2013 | — | Grease / FOG | — | — |
| Jul 17, 2013 | — | Other / Unknown | — | — |
| Jul 17, 2013 | — | Grease / FOG | — | — |
| Jul 15, 2013 | — | Other / Unknown | — | — |
| Jul 14, 2013 | — | Other / Unknown | — | — |
| Jul 14, 2013 | — | Equipment Failure | — | — |
| Jul 13, 2013 | — | Other / Unknown | — | — |
| Jul 10, 2013 | — | Rainfall / Flooding | — | — |
| Jul 9, 2013 | — | Grease / FOG | — | — |
| Jul 9, 2013 | — | Other / Unknown | — | — |
| Jul 9, 2013 | — | Other / Unknown | — | — |
| Jul 6, 2013 | — | Grease / FOG | — | — |
| Jul 5, 2013 | — | Equipment Failure | — | — |
| Jul 5, 2013 | — | Grease / FOG | — | — |
| Jul 5, 2013 | — | Grease / FOG | — | — |
| Jul 2, 2013 | — | Other / Unknown | — | — |
| Jul 1, 2013 | — | Grease / FOG | — | — |
| Jul 1, 2013 | — | Other / Unknown | — | — |
| Jun 26, 2013 | — | Other / Unknown | — | — |
| Jun 26, 2013 | — | Grease / FOG | — | — |
| Jun 21, 2013 | — | Equipment Failure | — | — |
| Jun 20, 2013 | — | Grease / FOG | — | — |
| Jun 20, 2013 | — | Grease / FOG | — | — |
| Jun 20, 2013 | — | Grease / FOG | — | — |
| Jun 18, 2013 | — | Other / Unknown | — | — |
| Jun 13, 2013 | — | Rainfall / Flooding | — | — |
| Jun 11, 2013 | — | Rainfall / Flooding | — | — |
| Jun 11, 2013 | — | Rainfall / Flooding | — | — |
| Jun 11, 2013 | — | Equipment Failure | — | — |
| Jun 10, 2013 | — | Rainfall / Flooding | — | — |
| Jun 10, 2013 | — | Rainfall / Flooding | — | — |
| Jun 10, 2013 | — | Rainfall / Flooding | — | — |
| Jun 10, 2013 | — | Rainfall / Flooding | — | — |
| Jun 8, 2013 | — | Other / Unknown | — | — |
| Jun 7, 2013 | — | Grease / FOG | — | — |
| Jun 3, 2013 | — | Rainfall / Flooding | — | — |
| May 29, 2013 | — | Grease / FOG | — | — |
| May 27, 2013 | — | Grease / FOG | — | — |
| May 26, 2013 | — | Grease / FOG | — | — |
| May 11, 2013 | — | Root Intrusion | — | — |
| May 11, 2013 | — | Grease / FOG | — | — |
| May 7, 2013 | — | Root Intrusion | — | — |
| May 6, 2013 | — | Root Intrusion | — | — |
| May 6, 2013 | — | Root Intrusion | — | — |
| May 3, 2013 | — | Equipment Failure | — | — |
| May 2, 2013 | — | Root Intrusion | — | — |
| May 1, 2013 | — | Grease / FOG | — | — |
| Apr 25, 2013 | — | Grease / FOG | — | — |
| Apr 22, 2013 | — | Other / Unknown | — | — |
| Apr 20, 2013 | — | Root Intrusion | — | — |
| Apr 19, 2013 | — | Grease / FOG | — | — |
| Apr 19, 2013 | — | Other / Unknown | — | — |
| Apr 17, 2013 | — | Grease / FOG | — | — |
| Apr 16, 2013 | — | Grease / FOG | — | — |
| Apr 15, 2013 | — | Other / Unknown | — | — |
| Apr 13, 2013 | — | Grease / FOG | — | — |
| Apr 13, 2013 | — | Grease / FOG | — | — |
| Apr 11, 2013 | — | Grease / FOG | — | — |
| Apr 11, 2013 | — | Root Intrusion | — | — |
| Apr 10, 2013 | — | Other / Unknown | — | — |
| Apr 7, 2013 | — | Other / Unknown | — | — |
| Apr 7, 2013 | — | Other / Unknown | — | — |
| Apr 7, 2013 | — | Other / Unknown | — | — |
| Apr 6, 2013 | — | Root Intrusion | — | — |
| Apr 3, 2013 | — | Root Intrusion | — | — |
| Apr 2, 2013 | — | Other / Unknown | — | — |
| Apr 1, 2013 | — | Other / Unknown | — | — |
| Mar 29, 2013 | — | Grease / FOG | — | — |
| Mar 28, 2013 | — | Grease / FOG | — | — |
| Mar 28, 2013 | — | Other / Unknown | — | — |
| Mar 27, 2013 | — | Root Intrusion | — | — |
| Mar 27, 2013 | — | Grease / FOG | — | — |
| Mar 27, 2013 | — | Grease / FOG | — | — |
| Mar 24, 2013 | — | Grease / FOG | — | — |
| Mar 24, 2013 | — | Root Intrusion | — | — |
| Mar 22, 2013 | — | Equipment Failure | — | — |
| Mar 21, 2013 | — | Grease / FOG | — | — |
| Mar 21, 2013 | — | Root Intrusion | — | — |
| Mar 21, 2013 | — | Equipment Failure | — | — |
| Mar 18, 2013 | — | Root Intrusion | — | — |
| Mar 17, 2013 | — | Other / Unknown | — | — |
| Mar 14, 2013 | — | Other / Unknown | — | — |
| Mar 12, 2013 | — | Other / Unknown | — | — |
| Mar 12, 2013 | — | Rainfall / Flooding | — | — |
| Mar 10, 2013 | — | Grease / FOG | — | — |
| Mar 10, 2013 | — | Grease / FOG | — | — |
| Mar 9, 2013 | — | Grease / FOG | — | — |
| Mar 8, 2013 | — | Grease / FOG | — | — |
| Mar 7, 2013 | — | Other / Unknown | — | — |
| Mar 7, 2013 | — | Grease / FOG | — | — |
| Mar 7, 2013 | — | Grease / FOG | — | — |
| Mar 6, 2013 | — | Grease / FOG | — | — |
| Mar 5, 2013 | — | Grease / FOG | — | — |
| Mar 3, 2013 | — | Root Intrusion | — | — |
| Mar 3, 2013 | — | Root Intrusion | — | — |
| Feb 28, 2013 | — | Grease / FOG | — | — |
| Feb 26, 2013 | — | Rainfall / Flooding | — | — |
| Feb 26, 2013 | — | Grease / FOG | — | — |
| Feb 26, 2013 | — | Root Intrusion | — | — |
| Feb 24, 2013 | — | Other / Unknown | — | — |
| Feb 24, 2013 | — | Other / Unknown | — | — |
| Feb 22, 2013 | — | Other / Unknown | — | — |
| Feb 21, 2013 | — | Other / Unknown | — | — |
Source: Maryland (MDE). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.