All rankings
Maryland · Maryland (MDE)

Back River WWTP Collection System - Baltimore City

Permit MDC021555

—
No waterway impact reported
Reported events
363
Total volume
38.2M gal
Reached waterways
0 (0%)
Reporting since
2023

What caused the overflows

Other / Unknown
363

Reported overflow events (showing 200 of 363)

DateVolumeCauseReached waterReceiving water
Jun 25, 20265 galOther / Unknown—unknown stream
Jun 22, 2026103 galOther / Unknown—no
Jun 18, 20261K galOther / Unknown—The SSO discharged into a storm drain. The individual I spoke with on the phone from the Baltimore DPW was not sure where this storm drain leads. This SSO occurred within the Jones Falls watershed area.
Jun 5, 20266 galOther / Unknown—Herring Run watershed
Jun 4, 2026250 galOther / Unknown—Herring Run
Jun 3, 2026282 galOther / Unknown—N/A
Jun 2, 20262K galOther / Unknown—Storm drain.
May 28, 2026625 galOther / Unknown—There was no overflow into waters of the state
May 25, 20266K galOther / Unknown—Gwynns Falls
May 24, 202627K galOther / Unknown—Jones Falls
May 23, 20263K galOther / Unknown—Herring Run
May 23, 202658K galOther / Unknown—Jones Falls River, Use I
May 15, 20262K galOther / Unknown—Herring Run
May 14, 2026633 galOther / Unknown—storm drain
May 14, 2026135 galOther / Unknown—None
May 13, 2026828 galOther / Unknown—N/A
May 4, 2026144 galOther / Unknown—Western Run
May 4, 20261 galOther / Unknown—N/A
Apr 26, 202650 galOther / Unknown—N/A
Apr 22, 20265K galOther / Unknown—storm drain
Apr 15, 2026360 galOther / Unknown—Storm drain- Herring Run
Apr 13, 20261 galOther / Unknown—N/A
Apr 9, 20263 galOther / Unknown—N/A
Apr 1, 2026110 galOther / Unknown—stormdrain
Mar 30, 20261 galOther / Unknown—N/A
Mar 24, 20261K galOther / Unknown—Northwest Harbor
Mar 24, 202634K galOther / Unknown—Biddison Run
Mar 23, 20262 galOther / Unknown—The SSO did not reach any stormwater system or waterways.
Mar 22, 20262 galOther / Unknown—N/A
Mar 22, 20267K galOther / Unknown—Inner Harbor via storm drains
Mar 21, 20263 galOther / Unknown—N/A
Mar 20, 20262K galOther / Unknown—underground storm drain
Mar 19, 202617K galOther / Unknown—Biddison Run
Mar 15, 20261 galOther / Unknown—N/A
Mar 9, 2026306 galOther / Unknown—Stony Run
Mar 5, 2026245 galOther / Unknown—none
Mar 2, 20262 galOther / Unknown—N/A
Mar 2, 2026381 galOther / Unknown—N/A
Feb 27, 20262 galOther / Unknown—Not applicable
Feb 20, 2026225 galOther / Unknown—N/A no release to waterways or storm drains
Feb 20, 20265 galOther / Unknown——
Feb 18, 20261 galOther / Unknown—N/A
Feb 17, 2026295 galOther / Unknown—Northwest Harbor
Feb 16, 20261 galOther / Unknown—N/A
Feb 14, 2026—Other / Unknown—N/A
Jan 30, 20267K galOther / Unknown—Biddison Run
Jan 29, 202625 galOther / Unknown—Northwest Harbor
Jan 28, 20261 galOther / Unknown—N/A
Jan 16, 2026208 galOther / Unknown—N/A
Jan 12, 202644 galOther / Unknown—The SSO release of 5 gallons was contained and cleaned up. The SSO did not enter any regulated resources.
Jan 10, 20262 galOther / Unknown—None
Jan 7, 20260 galOther / Unknown—none
Jan 6, 2026621K galOther / Unknown—Herring Run
Dec 21, 202580 galOther / Unknown—Reported to enter White Marsh Run through the woods. When contacted on 12/22/25, the caller stated that the sso did not reach waters of the State, just on the ground.
Dec 13, 20251 galOther / Unknown—N/A
Dec 11, 2025—Other / Unknown—Chinquapin Run
Dec 3, 2025—Other / Unknown—NA
Dec 2, 20252 galOther / Unknown—N/A
Nov 30, 2025250 galOther / Unknown—NA
Nov 30, 20251 galOther / Unknown—N/A
Nov 18, 20251 galOther / Unknown—N/A
Nov 17, 20255 galOther / Unknown—storm drain
Nov 16, 20251 galOther / Unknown—N/A
Nov 16, 20251 galOther / Unknown—N/A
Nov 16, 2025396 galOther / Unknown—Storm drain to Chinquapin Run
Nov 4, 20253 galOther / Unknown—N/A
Nov 1, 20251 galOther / Unknown—N/A
Oct 24, 202560 galOther / Unknown—Herring Run
Oct 19, 202590 galOther / Unknown—N/A
Oct 6, 20251 galOther / Unknown—N/A
Sep 23, 2025168 galOther / Unknown—N/A
Sep 18, 20251 galOther / Unknown—Chinquapin Run
Sep 8, 2025257 galOther / Unknown—None.
Sep 5, 2025398K galOther / Unknown—Herring Run
Sep 5, 2025360 galOther / Unknown—NA
Aug 23, 20251K galOther / Unknown—Northwest Harbor
Aug 18, 20252 galOther / Unknown—N/A
Aug 14, 202510K galOther / Unknown—Herring Run Use Class IV
Aug 6, 2025315 galOther / Unknown—Storm drain
Aug 2, 20251 galOther / Unknown—N/A
Aug 1, 20252 galOther / Unknown—N/A
Jul 31, 20252K galOther / Unknown—Jones Falls
Jul 31, 20255K galOther / Unknown—Jones Falls
Jul 31, 2025677K galOther / Unknown—Herring Run, use class IV
Jul 27, 20251 galOther / Unknown—N/A
Jul 18, 202550 galOther / Unknown—N/A
Jul 14, 202510K galOther / Unknown—Herring Run
Jul 14, 202560K galOther / Unknown—Entered sewer line located in junction box #2
Jul 12, 20254 galOther / Unknown—N/A
Jul 4, 20252 galOther / Unknown—N/A
Jun 27, 202529K galOther / Unknown—Biddison Run
Jun 20, 2025972 galOther / Unknown—SSO was isolated and did not enter into stormwater management or regulated resources.
Jun 20, 20255 galOther / Unknown—N/A
Jun 18, 20258K galOther / Unknown—Biddison Run
Jun 6, 202593 galOther / Unknown—N/A
Jun 1, 20251 galOther / Unknown—N/A
May 30, 202510K galOther / Unknown—Jones Falls
May 30, 2025476K galOther / Unknown—Herring Run
May 27, 20252 galOther / Unknown—N/A
May 25, 20255 galOther / Unknown—N/A
May 14, 202538K galOther / Unknown—Storm drain.
May 14, 2025112K galOther / Unknown—Jones Falls
May 12, 20253 galOther / Unknown—N/A
May 12, 20250 galOther / Unknown—N/A
May 12, 20252 galOther / Unknown—N/A
May 11, 20252 galOther / Unknown—N/A
May 8, 20252 galOther / Unknown—N/A
May 7, 20253K galOther / Unknown—Moores Run
May 7, 20252 galOther / Unknown—N/A
May 6, 20255 galOther / Unknown—N/A
May 1, 20251 galOther / Unknown—N/A
Apr 30, 20253 galOther / Unknown—N/A
Apr 28, 20251 galOther / Unknown—NA
Apr 28, 2025158 galOther / Unknown—Tiffany Run
Apr 26, 20253 galOther / Unknown—NA
Apr 25, 2025612 galOther / Unknown—Western Run
Apr 24, 20251 galOther / Unknown—NA
Apr 23, 20251 galOther / Unknown—NA
Apr 18, 202566 galOther / Unknown—NW Harbor
Apr 17, 2025158 galOther / Unknown—NW Harbor
Apr 16, 20251 galOther / Unknown—NA
Apr 16, 2025692 galOther / Unknown—Herring Run
Apr 16, 20251 galOther / Unknown—NA
Apr 15, 20251 galOther / Unknown—Western Run
Apr 12, 20251K galOther / Unknown—NW Harbor
Apr 6, 20251 galOther / Unknown—NA
Apr 5, 20251 galOther / Unknown—NA
Apr 5, 20252 galOther / Unknown—NA
Apr 5, 202510 galOther / Unknown—NA
Apr 3, 20256K galOther / Unknown—Chinquapin Run
Apr 3, 20256K galOther / Unknown—Chinquapin Run
Apr 2, 20251 galOther / Unknown—NA
Apr 2, 202525 galOther / Unknown—NA (nearby Montebello Wastewater Lake)
Mar 31, 20251 galOther / Unknown—NA
Mar 31, 20252 galOther / Unknown—NA
Mar 31, 20252 galOther / Unknown—NA
Mar 30, 20253 galOther / Unknown—NA
Mar 26, 20251 galOther / Unknown—NA
Mar 25, 202510K galOther / Unknown—Moores Run
Mar 23, 20251 galOther / Unknown—NA
Mar 21, 20251 galOther / Unknown—NA
Mar 19, 20252 galOther / Unknown—NA
Mar 10, 2025172 galOther / Unknown—NA
Mar 10, 20252K galOther / Unknown—into a storm drain connected to Moores Run into Herring Run
Mar 10, 20252 galOther / Unknown—NA
Mar 7, 20256 galOther / Unknown—N/A
Mar 6, 20251 galOther / Unknown—NA
Mar 4, 2025396 galOther / Unknown—Jones Falls
Mar 1, 20251 galOther / Unknown—NA
Feb 27, 202510K galOther / Unknown—None
Feb 26, 20256K galOther / Unknown—NA (nearest waterway is UT to Herring Run)
Feb 21, 20252 galOther / Unknown—NA
Feb 19, 20255 galOther / Unknown—NA
Feb 17, 2025115 galOther / Unknown—Western Run
Feb 13, 20252 galOther / Unknown—NA
Feb 11, 20252K galOther / Unknown—Baltimore Harbor
Feb 11, 20253 galOther / Unknown—NA
Feb 10, 2025980 galOther / Unknown—Jones Falls
Feb 9, 202590 galOther / Unknown—NA
Feb 8, 202561K galOther / Unknown—Jones Falls
Feb 6, 20255 galOther / Unknown—N/A
Feb 4, 20255 galOther / Unknown—NA
Feb 4, 202543K galOther / Unknown—Stoney Run Jones Falls Watershed
Feb 3, 202510 galOther / Unknown—Jones Falls
Jan 31, 20251K galOther / Unknown—Jones Falls
Jan 30, 20253K galOther / Unknown—Moore's Run
Jan 30, 20253 galOther / Unknown—NA
Jan 29, 2025680 galOther / Unknown—Moores Run
Jan 24, 20254.2M galOther / Unknown—Jones Falls
Jan 22, 2025344 galOther / Unknown—Colgate Creek
Jan 20, 202515K galOther / Unknown—Colgate Creek
Jan 20, 202515K galOther / Unknown—Colgate Creek
Jan 20, 202512K galOther / Unknown—Jones Falls
Jan 18, 2025283 galOther / Unknown—Baltimore Harbor, Gorsuch Creek
Jan 15, 20254K galOther / Unknown—Northwest Harbor
Jan 13, 2025112K galOther / Unknown—Western Run
Jan 13, 2025112K galOther / Unknown—storm drain /Western Run
Jan 8, 20253K galOther / Unknown—Jones Falls
Jan 8, 20252 galOther / Unknown—NA
Jan 7, 20252 galOther / Unknown—NA
Jan 5, 20253 galOther / Unknown—NA
Jan 2, 20252 galOther / Unknown—NA
Dec 31, 20241 galOther / Unknown—NA
Dec 30, 20241 galOther / Unknown—NA
Dec 19, 20243K galOther / Unknown—Stony Run
Dec 18, 20242K galOther / Unknown—Herring Run
Dec 16, 2024625 galOther / Unknown—NA (Jones Falls watershed)
Dec 13, 20242 galOther / Unknown—Gwynns Falls
Dec 13, 2024558 galOther / Unknown—Jones Falls
Dec 12, 20243K galOther / Unknown—Moores Run to Back River
Dec 11, 2024190 galOther / Unknown—Gwynns Falls
Dec 4, 20242K galOther / Unknown—Tiffany Run
Dec 4, 20241K galOther / Unknown—Storm drain pipe to Stony Run
Dec 2, 20243 galOther / Unknown—NA
Dec 2, 20241 galOther / Unknown—N/A
Nov 27, 202453 galOther / Unknown—Moores Run
Nov 24, 202413 galOther / Unknown—NA
Nov 22, 202444K galOther / Unknown—Maiden Choice Run
Nov 20, 202412 galOther / Unknown—Northwest Harbor
Nov 19, 20241 galOther / Unknown—NA

Source: Maryland (MDE). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.