Massachusetts / Events /

Combined sewer overflow: LOWELL REGIONAL WASTEWATER UTILITY, Sep 13, 2026

Ended (as reported) · LOWELL REGIONAL WASTEWATER UTILITY (MassDEP sewage notification portal)

Source: LOWELL REGIONAL WASTEWATER UTILITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record aa208211-ed39-4d87-9166-07232ac67458, published Sep 13, 2026, 7:55 PM EDT, retrieved 2026-11-02 10:58 UTC · notice

1. The reported outfall

Outfall reported by LOWELL REGIONAL WASTEWATER UTILITY (MA0100633 outfall LOW027): “TILDEN STREET”. Location: 42.65092, -71.31142, from the state's or EPA's outfall layer.

2. Waters named in the notice

The notice names: “MERRIMACK RIVER”. We place it on Merrimack River, MA. Matched by the name of the water in the source record.

3. Modeled downstream reach

No modeled reach for this record in this build.

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 13, 2026, 1:25 PM EDT

Ended

not reported

Precision

Known to the minute

Reported to the source

not given

Published

Sep 13, 2026, 7:55 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

not reported (not stated whether estimated or measured)

Volume in the source's words

none

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

• Caution Merrimack River: Discharge record with no status and no reported end, Sep 13, 2026, 1:25 PM EDT to Sep 27, 2026, 7:55 PM EDT
• Unresolved: no end reported Merrimack River: Unresolved: no end reported, Sep 27, 2026, 7:55 PM EDT to Oct 13, 2026, 7:55 PM EDT
• No current report Merrimack River: Unresolved: no end reported (off the map after 30 days), Oct 13, 2026, 7:55 PM EDT to Dec 12, 2026, 12:25 PM EST

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

aa208211-ed39-4d87-9166-07232ac67458

Original notice

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

Revision of

none (first record)

Revised by

no later revision

{
  "incidentId": "aa208211-ed39-4d87-9166-07232ac67458",
  "incidentNumber": "26017494",
  "incidentDate": "2026-09-13T00:00:00",
  "incidentTime": "13:25",
  "amPm": null,
  "reporterClass": "Public Notification Report",
  "eventType": "CSO – UnTreated",
  "permiteeClass": "CSO",
  "permiteeName": "LOWELL REGIONAL WASTEWATER UTILITY",
  "permiteeId": "MA0100633",
  "outfallId": "LOW027",
  "municipality": "LOWELL",
  "reportingType": "Initial-Ceased",
  "location": "TILDEN STREET",
  "latitude": null,
  "longitude": null,
  "waterBody": "MERRIMACK RIVER",
  "waterBodyDescription": null,
  "volumnOfEvent": "",
  "rainfallData": "",
  "hours": "",
  "minutes": "",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-09-13T19:55:05.49",
  "parentIncidentId": null,
  "_report_class": "Public Notification Report",
  "_tz_assumed": "America/New_York (portal gives local clock time without zone)",
  "_ended_note": "reported ceased; the portal gives no cessation time",
  "_coords": "MassDEP CSOs layer DEP_OUTFL_ LOW027 (locations are estimates)",
  "_water": {
    "via": "crosswalk on portal waterbody",
    "text": "MERRIMACK RIVER",
    "confidence": "high"
  },
  "_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"
}