Combined sewer overflow: BOSTON WATER & SEWER COMMISSION, Sep 27, 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 (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4e163653-e653-47b5-ace8-70d8c2fe6f8f, published Oct 14, 2026, 12:37 PM EDT, retrieved 2026-11-02 11:54 UTC · notice

Colours no water as of Nov 2, 2026, 6:56 AM EST: the windows on the methods page have passed, or the record has no time to count from.

A report is not a test of the water. See how statuses are worked out.

1. The reported outfall

Outfall reported by BOSTON WATER & SEWER COMMISSION (MA0101192 outfall BOS070): “CORNER OF W 4TH ST AND FRONTAGE RD”. Location: 42.34287, -71.06100, from the state's or EPA's outfall layer.

2. Waters named in the notice

The notice names: “FORT POINT CHANNEL”. Not placed on a tracked water.

3. Modeled downstream reach

Not modeled: the reach model runs on rivers above the head of tide only.

Source: water outlines from OpenBoatLaunch and OpenStreetMap contributors (ODbL); outfalls from EPA ECHO and the state outfall layers; modeled reaches computed by DirtyWaterWatch from USGS NLDI, NHDPlus and the nearest USGS gauge (Jobson 1996); basemap OpenFreeMap and OpenMapTiles.

Open on the main map

When: three different times

The time of the event, the time the source reported, published or updated it, and the time we fetched it are kept apart. Times are shown in New England time; the record keeps the original offsets.

Started: Sep 27, 2026, 9:05 AM EDT
Ended: Sep 27, 2026, 3:30 PM EDT
Precision: Known to the minute
Reported to the source: not given
Published: Oct 14, 2026, 12:37 PM EDT
Source last updated: not given
We fetched it: 2026-11-02 11:54 UTC

What and how much

Type: Combined sewer overflow
Status in the record: Ended (as reported)
Material: “CSO – UnTreated”
Volume: 6.36 million gal (not stated whether estimated or measured)
Volume in the source's words: “6361176”

Advice

“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.”
BOSTON WATER & SEWER COMMISSION (MassDEP sewage notification portal) · 314 CMR 16.04(10)(g)

Advice window: 48 hours
Basis: 314 CMR 16.04(10)(g)

Source and revisions

Source: MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/)
Record id at the source: 4e163653-e653-47b5-ace8-70d8c2fe6f8f
Original notice: https://eeaonline.eea.state.ma.us/portal/dep/cso-data-portal/detail…
Revision of: ma-massdep:be03bcfa-8e63-43f7-b47e-399834d02547
Revised by: no later revision

Every field of the record

All fields of event ma-massdep:4e163653-e653-47b5-ace8-70d8c2fe6f8f
`event_id`	ma-massdep:4e163653-e653-47b5-ace8-70d8c2fe6f8f
`source_id`	ma-massdep
`source_record_id`	4e163653-e653-47b5-ace8-70d8c2fe6f8f
`parent_event_id`	ma-massdep:be03bcfa-8e63-43f7-b47e-399834d02547
`event_type`	cso
`status`	ended
`discharger_id`	ma-bwsc
`discharger_name`	BOSTON WATER & SEWER COMMISSION
`npdes_permit`	MA0101192
`outfall_id`	BOS070
`outfall_name`	CORNER OF W 4TH ST AND FRONTAGE RD
`waterbody_text`	FORT POINT CHANNEL
`water_slugs`	[]
`water_match`	none
`lat`	42.342865
`lon`	-71.060996
`coord_source`	outfall_layer
`coord_precision_m`	null
`started_at`	2026-09-27T09:05:00-04:00
`ended_at`	2026-09-27T15:30:00-04:00
`time_precision`	minute
`reported_at`	null
`published_at`	2026-10-14T12:37:30-04:00
`source_updated_at`	null
`fetched_at`	2026-11-02T11:54:49Z
`material`	CSO – UnTreated
`volume_gal`	6361176
`volume_text`	6361176
`estimate_flag`	unknown
`authority`	BOSTON WATER & SEWER COMMISSION (MassDEP sewage notification portal)
`advice_text`	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_window_hours`	48
`advice_window_basis`	314 CMR 16.04(10)(g)
`source_url`	https://eeaonline.eea.state.ma.us/portal/dep/cso-data-portal/details/4e163653-e653-47b5-ace8-70d8c2fe6f8f
`parse_error`	null
`fixture`	false
`file`	events/ma-massdep~3A4e163653-e653-47b5-ace8-70d8c2fe6f8f.json
`duplicate_of`	null
`placement_note`	null
`unplaced_reason`	null
`set_aside`	null
`superseded`	null
`reach`	null
`reach_band`	null

The source's record (raw)

{
  "incidentId": "4e163653-e653-47b5-ace8-70d8c2fe6f8f",
  "incidentNumber": "26017839",
  "incidentDate": "2026-09-27T00:00:00",
  "incidentTime": "09:05",
  "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": "6361176",
  "rainfallData": "1.32",
  "hours": "6",
  "minutes": "25",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-10-14T12:37:30.827",
  "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 6 h 25 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 26017599; start times 0 min apart"
}

Personal fields (names, emails, phone numbers of staff) are removed from raw records before they are stored.