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Combined sewer overflow (CSO) reported — BOSTON WATER & SEWER COMMISSION, Jul 21, 2026

Ended (as reported) · BOSTON WATER & SEWER COMMISSION (MassDEP sewage notification portal)

Source: BOSTON WATER & SEWER COMMISSION (MassDEP sewage notification portal) via MassDEP CSO API behind the portal, record a3d785e2-09ff-4f8c-9c78-21908c3cd36f, published Aug 12, 2026, 11:45 AM EDT, retrieved 2026-11-02 10:58 UTC · Read the original notice

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1. Reported wastewater outlet

Operator named in the record: BOSTON WATER & SEWER COMMISSION (federal wastewater discharge permit, NPDES, MA0101192). Outlet: BOS070 “CORNER OF W 4TH ST AND FRONTAGE RD”. Location: 42.34287, -71.06100; location source: from the state's or EPA's outfall layer.

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

2. Waters named in the notice

The notice names: “FORT POINT CHANNEL”. DirtyWaterWatch links this report to Fort Point Channel, MA. Match basis: the water named in the report.

3. Estimated downstream stretch

We estimate routes only on rivers before they become tidal. We do not estimate routes through tidal water or lakes.

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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

Jul 21, 2026, 6:15 PM EDT

Ended

Jul 21, 2026, 6:25 PM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

Aug 12, 2026, 11:45 AM EDT

Source last updated

not given

Last retrieved by DirtyWaterWatch

2026-11-02 10:58 UTC

What and how much

Type

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system.

Status in the record

Ended (as reported)

Material

“CSO – UnTreated”

Volume

21,910 gallons (not stated whether estimated or measured)

Volume as reported

“21910”

Advice from BOSTON WATER & SEWER COMMISSION (MassDEP sewage notification portal)

“Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants. See website for more information on whether specific resource areas, such as bathing beaches, are affected.”

Advice period

48 hours

Basis

314 CMR 16.04(10)(g)

Source and versions

Source

MassDEP CSO API behind the portal

Source record number

a3d785e2-09ff-4f8c-9c78-21908c3cd36f

Original notice

Read the original notice

Earlier version

Read the earlier version

Later versions

None

{
  "incidentId": "a3d785e2-09ff-4f8c-9c78-21908c3cd36f",
  "incidentNumber": "26017174",
  "incidentDate": "2026-07-21T00:00:00",
  "incidentTime": "18:15",
  "amPm": null,
  "reporterClass": "Verified Data Report",
  "eventType": "CSO – UnTreated",
  "permiteeClass": "CSO",
  "permiteeName": "BOSTON WATER & SEWER COMMISSION",
  "permiteeId": "MA0101192",
  "outfallId": "BOS070",
  "municipality": "BOSTON",
  "reportingType": null,
  "location": "CORNER OF W 4TH ST AND FRONTAGE RD",
  "latitude": null,
  "longitude": null,
  "waterBody": "FORT POINT CHANNEL",
  "waterBodyDescription": null,
  "volumnOfEvent": "21910",
  "rainfallData": "0.68",
  "hours": "0",
  "minutes": "10",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-08-12T11:45:44.227",
  "parentIncidentId": null,
  "_report_class": "Verified Data Report",
  "_tz_assumed": "America/New_York (portal gives local clock time without zone)",
  "_ended_at_basis": "computed: started_at + verified duration 0 h 10 min (Verified Data Report)",
  "_coords": "MassDEP CSOs layer DEP_OUTFL_ BOS070 (locations are estimates)",
  "_water": {
    "no_slug": [
      "FORT POINT CHANNEL (no slug)",
      "FORT POINT CHANNEL (no slug)"
    ]
  },
  "_volume_note": "verified by permittee, reported to MassDEP (metered or modelled not stated)",
  "_advice_source": "required wording of 314 CMR 16.04(10)(g); the permittee's own advisory is only in an attachment the portal will not serve",
  "_link_basis": "same permittee and outfall as notice 26016798; start times 0 min apart"
}