Blended discharge reported — Mamaroneck (V) Sanitary SD, Aug 20, 2026

Ended (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 2693770739019583, reported Aug 23, 2026, 1:01 PM EDT, retrieved 2026-11-02 20:40 UTC · Read the original notice

Current status from this report

This report does not set a map status as of Nov 2, 2026, 4:26 PM EST. Check its dates and the status rules.

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: Aug 20, 2026, 8:20 PM EDT
Ended: Aug 21, 2026, 1:55 AM EDT
Detail provided by the source: Times known to the minute
Reported to the source: Aug 23, 2026, 1:01 PM EDT
Published: Aug 23, 2026, 1:01 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: Ended (as reported)
Material: “Partially Treated with Disinfection”
Volume: 2.43 million gallons (measured or verified)
Volume as reported: “2,426,530 Gallons Actual”

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

Status history from this report

Discharge or advisory reported Long Island Sound: Discharge reported ongoing, Aug 20, 2026, 8:20 PM EDT to Aug 21, 2026, 1:55 AM EDT
Caution Long Island Sound: Within the caution period after the reported end, Aug 21, 2026, 1:55 AM EDT to Aug 24, 2026, 1:55 AM EDT

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-02 21:26 UTC.

Source and versions

Source: NY DEC Sewage Pollution Right to Know
Source record number: 2693770739019583
Original notice: Read the original notice
Earlier version: Read the earlier version
Later versions: None

Record details

Record details
Record identifier	ny-dec-sprtk:2693770739019583
Source identifier	ny-dec-sprtk
Source record number	2693770739019583
Earlier version	ny-dec-sprtk:2700196010019300
Type	Blended discharge
Status in the report	Ended (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	Aug 20, 2026, 8:20 PM EDT (2026-08-20T20:20:00-04:00)
Ended	Aug 21, 2026, 1:55 AM EDT (2026-08-21T01:55:00-04:00)
Detail provided by the source	to the minute
Reported to the source	Aug 23, 2026, 1:01 PM EDT (2026-08-23T13:01:10-04:00)
Published	Aug 23, 2026, 1:01 PM EDT (2026-08-23T13:01:10-04:00)
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	2,426,530
Volume as reported	2,426,530 Gallons Actual
How volume was determined	measured or verified
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": "2693770739019583",
    "sprtkAirDateTime": "08/23/2026 17:01:10",
    "notificationStatus": "Update",
    "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": "08/21/2026 00:20:00",
    "sprtkEndDischargeDatetime": "08/21/2026 05:55:00",
    "dischargeDuration": "5.58 Hours - Ended",
    "surfaceWater": "Yes",
    "receivingWaterBody": "Long Island Sound",
    "quantity": "2,426,530 Gallons Actual",
    "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": 5211,
  "_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"
  },
  "_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)"
  },
  "_chain": {
    "id": "key:NY0026701|199 west boston post rd mamaroneck|2026-08-21T00:20Z",
    "basis": "facility + address + start",
    "position": 2,
    "of": 2,
    "head": "ny-dec-sprtk:2700196010019300",
    "latest": "ny-dec-sprtk:2693770739019583",
    "notices": [
      {
        "id": "2700196010019300",
        "status": "New",
        "aired": "2026-08-20T21:02:38-04:00"
      },
      {
        "id": "2693770739019583",
        "status": "Update",
        "aired": "2026-08-23T13:01:10-04:00"
      }
    ]
  }
}

Source: Mamaroneck (V) Sanitary SD (NY DEC Sewage Pollution Right to Know), record 2693770739019583, reported Aug 23, 2026, 1:01 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.