Massachusetts / Reports /

Blended discharge reported — GREATER LAWRENCE SANITARY DISTRICT, Jul 28, 2026

Ended (as reported) · GREATER LAWRENCE SANITARY DISTRICT (MassDEP sewage notification portal)

Source: GREATER LAWRENCE SANITARY DISTRICT (MassDEP sewage notification portal) via MassDEP CSO API behind the portal, record fadeacc4-0f44-4dc3-bff1-13a332e7b772, published Jul 29, 2026, 1:31 PM 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: GREATER LAWRENCE SANITARY DISTRICT (federal wastewater discharge permit, NPDES, MA0100447). Outlet: 001. Location: 42.71780, -71.13371; location source: given in the source record.

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

2. Waters named in the notice

The notice names: “MERRIMACK RIVER”. DirtyWaterWatch links this report to Merrimack River, MA. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

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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 28, 2026, 4:15 PM EDT

Ended

Jul 28, 2026, 5:28 PM EDT

Detail provided by the source

Times known to the minute

Reported to the source

not given

Published

Jul 29, 2026, 1:31 PM EDT

Source last updated

not given

Last retrieved by DirtyWaterWatch

2026-11-02 10:58 UTC

What and how much

Type

Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.

Status in the record

Ended (as reported)

Material

“Partially Treated – Blended”

Volume

790,000 gallons (not stated whether estimated or measured)

Volume as reported

“790000”

Advice from GREATER LAWRENCE SANITARY DISTRICT (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

fadeacc4-0f44-4dc3-bff1-13a332e7b772

Original notice

Read the original notice

Earlier version

Read the earlier version

Later versions

None

{
  "incidentId": "fadeacc4-0f44-4dc3-bff1-13a332e7b772",
  "incidentNumber": "26016874",
  "incidentDate": "2026-07-28T00:00:00",
  "incidentTime": "16:15",
  "amPm": null,
  "reporterClass": "Verified Data Report",
  "eventType": "Partially Treated – Blended",
  "permiteeClass": "CSO",
  "permiteeName": "GREATER LAWRENCE SANITARY DISTRICT",
  "permiteeId": "MA0100447",
  "outfallId": "001",
  "municipality": "NORTH ANDOVER",
  "reportingType": null,
  "location": "Other",
  "latitude": "42.71780397",
  "longitude": "-71.1337055",
  "waterBody": "MERRIMACK RIVER",
  "waterBodyDescription": null,
  "volumnOfEvent": "790000",
  "rainfallData": "1.23",
  "hours": "1",
  "minutes": "13",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-07-29T13:31:50.5",
  "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 1 h 13 min (Verified Data Report)",
  "_water": {
    "via": "crosswalk on portal waterbody",
    "text": "MERRIMACK RIVER",
    "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 26016842; start times 0 min apart"
}