Massachusetts / Events /

Combined sewer overflow: LYNN WATER & SEWER COMMISSION, Aug 23, 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 c92721c2-e61d-4be9-b459-beeb97b3beb6, published Sep 15, 2026, 1:03 PM EDT, retrieved 2026-11-02 10:58 UTC · notice

1. The reported outfall

Outfall reported by LYNN WATER & SEWER COMMISSION (MA0100552 outfall LYNN005): “180 LYNNWAY”. Location: 42.45979, -70.94464, 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

Aug 23, 2026, 1:00 PM EDT

Ended

Aug 23, 2026, 1:10 PM EDT

Precision

Known to the minute

Reported to the source

not given

Published

Sep 15, 2026, 1:03 PM EDT

Source last updated

not given

We fetched it

2026-11-02 10:58 UTC

What and how much

Type

Combined sewer overflow

Status in the record

Ended (as reported)

Material

“CSO – UnTreated”

Volume

12,590 gal (not stated whether estimated or measured)

Volume in the source's words

“12590”

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, Aug 23, 2026, 1:00 PM EDT to Aug 23, 2026, 1:10 PM EDT
• Advisory in effect Lynn Harbor: Within the authority's advice window after the discharge ended, Aug 23, 2026, 1:10 PM EDT to Aug 25, 2026, 1:10 PM EDT
• Caution Lynn Harbor: Within the site's caution window after the discharge ended (data/rules.json), Aug 25, 2026, 1:10 PM EDT to Aug 26, 2026, 1:10 PM 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

c92721c2-e61d-4be9-b459-beeb97b3beb6

Original notice

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

Revision of

ma-massdep:a56763cb-4cb5-45f7-be32-161ae1c14335

Revised by

no later revision

{
  "incidentId": "c92721c2-e61d-4be9-b459-beeb97b3beb6",
  "incidentNumber": "26017556",
  "incidentDate": "2026-08-23T00:00:00",
  "incidentTime": "13:00",
  "amPm": null,
  "reporterClass": "Verified Data Report",
  "eventType": "CSO – UnTreated",
  "permiteeClass": "CSO",
  "permiteeName": "LYNN WATER & SEWER COMMISSION",
  "permiteeId": "MA0100552",
  "outfallId": "LYNN005",
  "municipality": "LYNN",
  "reportingType": null,
  "location": "180 LYNNWAY",
  "latitude": null,
  "longitude": null,
  "waterBody": "LYNN HARBOR",
  "waterBodyDescription": null,
  "volumnOfEvent": "12590",
  "rainfallData": "0.43",
  "hours": "0",
  "minutes": "10",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-09-15T13:03:59.283",
  "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_ LYNN005 (locations are estimates)",
  "_water": {
    "via": "crosswalk on portal waterbody",
    "text": "LYNN HARBOR",
    "confidence": "high"
  },
  "_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 26017336; start times 5 min apart"
}