Massachusetts / Events /

Combined sewer overflow: LYNN WATER & SEWER COMMISSION, Sep 27, 2026

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

Source: LYNN WATER & SEWER COMMISSION (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3ce9947e-e9b1-4bf7-9021-9918114ad259, published Oct 14, 2026, 10:02 AM EDT, retrieved 2026-11-02 11:54 UTC · notice

1. The reported outfall

Outfall reported by LYNN WATER & SEWER COMMISSION (MA0100552 outfall LYNN004): “NW BANK OF BROAD SOUND @254 LYNWAY@PLEASANT ST”. Location: 42.45974, -70.94474, from the state's or EPA's outfall layer.

2. Waters named in the notice

The notice names: “LYNN HARBOR”. We place it on Lynn Harbor, MA. Matched by the name of the water in the source record.

3. Modeled downstream reach

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

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, 10:45 AM EDT

Ended

Sep 27, 2026, 10:45 AM EDT

Precision

Known to the minute

Reported to the source

not given

Published

Oct 14, 2026, 10:02 AM 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

0 gal (not stated whether estimated or measured)

Volume in the source's words

“0”

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.”

Advice window

48 hours

Basis

314 CMR 16.04(10)(g)

What it does to the map, over time

• Advisory in effect Lynn Harbor: Discharge in progress, Sep 27, 2026, 10:45 AM EDT to Sep 27, 2026, 10:45 AM EDT
• Advisory in effect Lynn Harbor: Within the authority's advice window after the discharge ended, Sep 27, 2026, 10:45 AM EDT to Sep 29, 2026, 10:45 AM EDT
• Caution Lynn Harbor: Within the site's caution window after the discharge ended (data/rules.json), Sep 29, 2026, 10:45 AM EDT to Sep 30, 2026, 10:45 AM EDT

Source: intervals computed by DirtyWaterWatch (build/status.py) from this record and the rules on the methods page, as of 2026-11-02 11:56 UTC.

Source and revisions

Source

MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/)

Record id at the source

3ce9947e-e9b1-4bf7-9021-9918114ad259

Original notice

https://eeaonline.eea.state.ma.us/portal/dep/cso-data-portal/detail…

Revision of

ma-massdep:a6a39919-5964-4877-9bb7-301d1cb9f2f3

Revised by

no later revision

{
  "incidentId": "3ce9947e-e9b1-4bf7-9021-9918114ad259",
  "incidentNumber": "26017818",
  "incidentDate": "2026-09-27T00:00:00",
  "incidentTime": "10:45",
  "amPm": null,
  "reporterClass": "Verified Data Report",
  "eventType": "CSO – UnTreated",
  "permiteeClass": "CSO",
  "permiteeName": "LYNN WATER & SEWER COMMISSION",
  "permiteeId": "MA0100552",
  "outfallId": "LYNN004",
  "municipality": "LYNN",
  "reportingType": null,
  "location": "NW BANK OF BROAD SOUND @254 LYNWAY@PLEASANT ST",
  "latitude": null,
  "longitude": null,
  "waterBody": "LYNN HARBOR",
  "waterBodyDescription": null,
  "volumnOfEvent": "0",
  "rainfallData": "1.32",
  "hours": "0",
  "minutes": "0",
  "month": null,
  "year": null,
  "additionalInformation": "Upon further review of the data, Flow Assessment Services determined that no overflow occurred. Please see the attached supporting documents.",
  "submittedDate": "2026-10-14T10:02:17.233",
  "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 0 min (Verified Data Report)",
  "_coords": "MassDEP CSOs layer DEP_OUTFL_ LYNN004 (locations are estimates)",
  "_water": {
    "via": "crosswalk on portal waterbody",
    "text": "LYNN HARBOR",
    "confidence": "high"
  },
  "_volume_note": "zero volume: MassDEP records a retraction this way",
  "_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 26017601; start times 0 min apart"
}