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Combined sewer overflow (CSO) reported — Oswego (C) West Side WWTF Excess Flow Management Facility, Mar 31, 2026

Ongoing (as reported) · Oswego (C) West Side WWTF Excess Flow Management Facility (NY DEC Sewage Pollution Right to Know)

Source: Oswego (C) West Side WWTF Excess Flow Management Facility (NY DEC Sewage Pollution Right to Know), record 2431124899116743, reported Mar 31, 2026, 12:09 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.

Latest conditions, not at the time of this report:At the Oswego River at Lock 7, Oswego NY gauge, 700 metres from the nearest boat launch on Oswego River: flow 1,050 cubic feet per second (Nov 2, 2026, 3:45 PM EST). Conditions are measured at the gauge, not at this spot, and do not change the status.Conditions on Oswego River

Source: U.S. Geological Survey via Water Data for the Nation, gauge 04249000, reading Nov 2, 2026, 3:45 PM EST, retrieved 2026-11-02 21:22 UTC. Gauge chosen by DirtyWaterWatch. · Readings and history at USGS

Read the original notice · Report an error

1. Reported wastewater outlet

Operator named in the record: Oswego (C) West Side WWTF Excess Flow Management Facility (federal wastewater discharge permit, NPDES, NY0029106). Outlet: “Concrete Pipe”. Location: 43.46090, -76.51330; 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: “Oswego River”. DirtyWaterWatch links this report to Oswego River, NY. Match basis: the water named in the report.

3. Estimated downstream stretch

No downstream estimate is available for this report.

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 31, 2026, 5:56 AM EDT
Ended: ongoing, as last reported
Detail provided by the source: Times known to the minute
Reported to the source: Mar 31, 2026, 12:09 PM EDT
Published: Mar 31, 2026, 12:09 PM EDT
Source last updated: not given
Last retrieved by DirtyWaterWatch: 2026-11-02 20:40 UTC

What and how much

Type: Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system.
Status in the record: Ongoing (as reported)
Material: “Partially Treated with Disinfection”
Volume: 3.9 million gallons (estimated)
Volume as reported: “3,895,000 Gallons Estimated”

Advice from Oswego (C) West Side WWTF Excess Flow Management Facility (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: 2431124899116743
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:2431124899116743
Source identifier	ny-dec-sprtk
Source record number	2431124899116743
Earlier version	Not provided
Type	Combined sewer overflow (CSO)
Status in the report	Ongoing (as reported)
Sewer operator identifier	ny-oswego-west
Sewer operator	Oswego (C) West Side WWTF Excess Flow Management Facility
Federal wastewater discharge permit (NPDES)	NY0029106
Outlet number	Not provided
Outlet name	Concrete Pipe
Water named in the report	Oswego River
Linked waters	oswego-river-ny
How this report was linked to the water	the water named in the report
Latitude	43.461
Longitude	-76.513
Location source	given in the source record
Location accuracy, in metres	Not provided
Started	Mar 31, 2026, 5:56 AM EDT (2026-03-31T05:56:00-04:00)
Ended	Not provided
Detail provided by the source	to the minute
Reported to the source	Mar 31, 2026, 12:09 PM EDT (2026-03-31T12:09:23-04:00)
Published	Mar 31, 2026, 12:09 PM EDT (2026-03-31T12:09:23-04:00)
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	3,895,000
Volume as reported	3,895,000 Gallons Estimated
How volume was determined	estimated
Authority	Oswego (C) West Side WWTF Excess Flow Management Facility (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": "2431124899116743",
    "sprtkAirDateTime": "03/31/2026 16:09:23",
    "notificationStatus": "New",
    "facilityName": "Oswego (C) West Side WWTF NY0029106 Excess Flow Management Facility",
    "facilityId": "NY0029106",
    "countyName": "Oswego",
    "streetNumber": "67",
    "streetName": "West First Street",
    "city": "Oswego",
    "addressDescription": "Excess Flow Management Facility",
    "latitude": "-76.5133",
    "longitude": "43.4609",
    "sprtkStartDischargeDatetime": "03/31/2026 09:56:00",
    "sprtkEndDischargeDatetime": "03/31/2026 22:00:00",
    "dischargeDuration": "Appx 12 Hours - Ongoing",
    "surfaceWater": "Yes",
    "receivingWaterBody": "Oswego River",
    "componentDescription": "Concrete Pipe",
    "quantity": "3,895,000 Gallons Estimated",
    "treatedState": "Partially Treated with Disinfection",
    "dischargeDescription": "Combined Sanitary/Stormwater Dischharge",
    "stepsToContain": "Maximum flow being pumped from EFMF to Main Treatment Facility",
    "geoaddress": "67 W 1st St, Oswego, NY 13126, USA",
    "impactedArea": "Fishing Area - West River Bank",
    "dischargeReason": "Weather Conditions - Excessive Rain Event",
    "systemComponent": "CSO Outfall - Concrete Pipe",
    "region": "7",
    "sprtkDischargeWaterFlow": "Manmade",
    "sprtkImpactAreaDesc": "West River Bank",
    "sprtkExplanation": "Excessive Rain Event"
  },
  "_tab": "January 2026-August2026",
  "_row": 1676,
  "_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": "2026-03-31T18:00:00-04:00",
  "_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": "a CSO outfall named in the system component",
  "_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:NY0029106|67 west first street oswego|2026-03-31T09:56Z",
    "basis": "facility + address + start",
    "position": 1,
    "of": 2,
    "head": "ny-dec-sprtk:2431124899116743",
    "latest": "ny-dec-sprtk:2436588097568152"
  }
}

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