Blended discharge reported — Mamaroneck (V) Sanitary SD, Mar 16, 2026

Ongoing (as reported) · Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know)

Source: Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know), record 2431124898845876, reported Mar 16, 2026, 8:24 PM EDT, retrieved 2026-11-02 20:40 UTC · Read the original notice

Current status from this report

Earlier version. A later record from the same source replaces this one. The newest version sets the map status. read the newer version

A report is not a test of the water. See how we assign statuses.

Read the original notice · Report an error

1. Reported wastewater outlet

Operator named in the record: Mamaroneck (V) Sanitary SD (federal wastewater discharge permit, NPDES, NY0026701). Outlet: “MMWWTP”. Location: 40.94760, -73.73330; 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: “Long Island Sound”. DirtyWaterWatch links this report to Long Island Sound, NY. Match basis: the water named in the report.

3. Estimated downstream stretch

We estimate routes only on rivers before they become tidal. We do not estimate routes through tidal water or lakes.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Open on the main map

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: Mar 16, 2026, 7:18 PM EDT
Ended: ongoing, as last reported
Detail provided by the source: Times known to the minute
Reported to the source: Mar 16, 2026, 8:24 PM EDT
Published: Mar 16, 2026, 8:24 PM EDT
Source last updated: not given
Last retrieved by DirtyWaterWatch: 2026-11-02 20:40 UTC

What and how much

Type: Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.
Status in the record: Ongoing (as reported)
Material: “Partially Treated with Disinfection”
Volume: 10 million gallons (estimated)
Volume as reported: “10,000,000 Gallons Estimated”

Advice from Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know)

This report includes no advice. Check current local health notices.

Advice period: This report does not state a period. See the rule DirtyWaterWatch applies and its source.
Basis: not stated

Source and versions

Source: NY DEC Sewage Pollution Right to Know
Source record number: 2431124898845876
Original notice: Read the original notice
Earlier version: None: this is the first record
Later versions: version 2

Record details

Record details
Record identifier	ny-dec-sprtk:2431124898845876
Source identifier	ny-dec-sprtk
Source record number	2431124898845876
Earlier version	Not provided
Type	Blended discharge
Status in the report	Ongoing (as reported)
Sewer operator identifier	ny-mamaroneck-sd
Sewer operator	Mamaroneck (V) Sanitary SD
Federal wastewater discharge permit (NPDES)	NY0026701
Outlet number	Not provided
Outlet name	MMWWTP
Water named in the report	Long Island Sound
Linked waters	long-island-sound-ny
How this report was linked to the water	the water named in the report
Latitude	40.948
Longitude	-73.733
Location source	given in the source record
Location accuracy, in metres	Not provided
Started	Mar 16, 2026, 7:18 PM EDT (2026-03-16T19:18:00-04:00)
Ended	Not provided
Detail provided by the source	to the minute
Reported to the source	Mar 16, 2026, 8:24 PM EDT (2026-03-16T20:24:00-04:00)
Published	Mar 16, 2026, 8:24 PM EDT (2026-03-16T20:24:00-04:00)
Source last updated	Not provided
Last retrieved by DirtyWaterWatch	Nov 2, 2026, 3:40 PM EST (2026-11-02T20:40:35Z)
Material	Partially Treated with Disinfection
Volume, in gallons	10,000,000
Volume as reported	10,000,000 Gallons Estimated
How volume was determined	estimated
Authority	Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know)
Advice	Not provided
Advice period, in hours	Not provided
Basis of the advice period	Not provided
Original notice	https://www.dec.ny.gov/fs/data/SPRTK_Data.xlsx

Original source data

{
  "row": {
    "notificationId": "2431124898845876",
    "sprtkAirDateTime": "03/17/2026 00:24:00",
    "notificationStatus": "New",
    "facilityName": "Mamaroneck (V) Sanitary SD NY0026701",
    "facilityId": "NY0026701",
    "countyName": "Westchester",
    "streetNumber": "199",
    "streetName": "West Boston Post Rd",
    "city": "Mamaroneck",
    "addressDescription": "MMWWTP",
    "latitude": "-73.7333",
    "longitude": "40.9476",
    "sprtkStartDischargeDatetime": "03/16/2026 23:18:00",
    "sprtkEndDischargeDatetime": "03/17/2026 23:18:00",
    "dischargeDuration": "24 Hours - Ongoing",
    "surfaceWater": "Yes",
    "receivingWaterBody": "Long Island Sound",
    "quantity": "10,000,000 Gallons Estimated",
    "treatedState": "Partially Treated with Disinfection",
    "stepsToContain": "Maximize Flow to Secondary",
    "geoaddress": "199 W Boston Post Rd, Mamaroneck, NY 10543, USA",
    "impactedArea": "Unknown -",
    "dischargeReason": "Weather Conditions - Short Term Partial Blend Wet Weather Event",
    "systemComponent": "Pipe -",
    "region": "3",
    "sprtkDischargeWaterFlow": "Manmade",
    "sprtkExplanation": "Short Term Partial Blend Wet Weather Event"
  },
  "_tab": "January 2026-August2026",
  "_row": 1195,
  "_time_basis": {
    "air": "UTC in the workbook (rows aired from late May 2025); converted to America/New_York",
    "start": "UTC in the workbook (rows aired from late May 2025); converted to America/New_York",
    "end": "UTC in the workbook (rows aired from late May 2025); converted to America/New_York"
  },
  "_projected_end": "2026-03-17T19:18:00-04:00",
  "_projected_end_note": "NY-Alert requires an expected end time on every notice; this one is a projection, not a reported end",
  "_coords": "latitude and longitude columns swapped; a street-address geocode chosen by the notifier",
  "_event_type_basis": "blending named in the notice text",
  "_water": {
    "via": "receiving water name within New York (checked against the geocode)"
  },
  "_volume_note": "first (New) notice: NY-Alert requires a volume and an end time up front, so this figure is the notifier's estimate or placeholder, not a measured total",
  "_chain": {
    "id": "key:NY0026701|199 west boston post rd mamaroneck|2026-03-16T23:18Z",
    "basis": "facility + address + start",
    "position": 1,
    "of": 2,
    "head": "ny-dec-sprtk:2431124898845876",
    "latest": "ny-dec-sprtk:2426211456286276"
  }
}

Source: Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know), record 2431124898845876, reported Mar 16, 2026, 8:24 PM EDT, retrieved 2026-11-02 20:40 UTC · Read the original notice

Staff names, email addresses and phone numbers are removed from source data before it is stored.