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Treatment bypass reported — Baltimore City DPW, May 23, 2026

Ended (as reported) · Baltimore City DPW

Source: Baltimore City DPW via MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u), record md0021601-20260523T0500-3501-asiatic-ave, updated by the source Nov 2, 2026, 10:55 AM EST, retrieved 2026-11-03 02:31 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: Baltimore City DPW (federal wastewater discharge permit, NPDES, MD0021601). Outlet: “3501 Asiatic Avenue”. Location: not given in the report or in the outlet records.

Outfall: a pipe or outlet where wastewater enters a water body.

2. Waters named in the notice

The notice names: “Partial bypass to the Patapsco River”. DirtyWaterWatch links this report to Patapsco River, MD. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

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When it happened and when it was reported

Event and notice times use Eastern Time (EST or EDT). Retrieval times use Coordinated Universal Time (UTC).

Started

May 23, 2026, 5:00 AM EDT

Ended

May 24, 2026, 4:00 AM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

not given

Source last updated

Nov 2, 2026, 10:55 AM EST

Last retrieved by DirtyWaterWatch

2026-11-03 02:31 UTC

What and how much

Type

Treatment bypass: wastewater skips one or more treatment steps.

Status in the record

Ended (as reported)

Material

not stated

Volume

18.23 million gallons (not stated whether estimated or measured)

Volume as reported

“18230000 gallons”

Advice from Baltimore City DPW

This report includes no advice. Check current local health notices.

Advice period

This report does not state a period. See the rule DirtyWaterWatch applies and its source.

Basis

not stated

Source and versions

Source

MDE Reported Sewer Overflows (New for 2023), Maryland Open Data Portal (Socrata stgj-u72u)

Source record number

md0021601-20260523T0500-3501-asiatic-ave

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "row": {
    "overflow_type": "Bypass",
    "facility_collection_system": "PATAPSCO WWTP",
    "npdes_no": "MD0021601",
    "start_date": "05/23/2026",
    "start_time": "05:00:00",
    "duration_day": "0",
    "duration_hour": "23",
    "duration_minute": "0",
    "overflow_address": "3501 Asiatic Avenue",
    "zip": "21226",
    "owner_name": "Baltimore City DPW",
    "discharge_volume": "18230000",
    "overflow_cause": "When flow increased because of rain, head losses within the BAF facility began rising. To prevent the BAF filters from blinding, the flow to the ENR system was limited to 75 MGD.",
    "receiving_water": "Partial bypass to the Patapsco River",
    "county": "Baltimore",
    "penalty_id": "",
    "overflow_latitude": "",
    "overflow_longitude": "",
    "id": "373"
  },
  "_ended_at_basis": "start + duration_day/hour/minute",
  "_coords": "no coordinates",
  "_water": {
    "via": "receiving water name within Maryland and county Baltimore"
  },
  "_discharger_basis": "permit/system id MD0021601",
  "_first_seen_at": "2026-11-03T02:28:49Z"
}