Combined sewer overflow (CSO) reported — Oswego (C) East Side STP (Stormwater Detention Basin), Jan 9, 2026

Ongoing (as reported) · Oswego (C) East Side STP (Stormwater Detention Basin) (NY DEC Sewage Pollution Right to Know)

Source: Oswego (C) East Side STP (Stormwater Detention Basin) (NY DEC Sewage Pollution Right to Know), record 2310865814958575, reported Jan 9, 2026, 6:53 PM EST, 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: Oswego (C) East Side STP (Stormwater Detention Basin) (federal wastewater discharge permit, NPDES, NY0029114). Outlet: “Concrete Pipe”. Location: 43.47030, -76.49810; 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: “Lake Ontario”. DirtyWaterWatch links this report to Lake Ontario, 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: Jan 9, 2026, 2:30 PM EST
Ended: ongoing, as last reported
Detail provided by the source: Times known to the minute
Reported to the source: Jan 9, 2026, 6:53 PM EST
Published: Jan 9, 2026, 6:53 PM EST
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: 100,000 gallons (estimated)
Volume as reported: “100,000 Gallons Estimated”

Advice from Oswego (C) East Side STP (Stormwater Detention Basin) (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: 2310865814958575
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:2310865814958575
Source identifier	ny-dec-sprtk
Source record number	2310865814958575
Earlier version	Not provided
Type	Combined sewer overflow (CSO)
Status in the report	Ongoing (as reported)
Sewer operator identifier	ny-oswego-east
Sewer operator	Oswego (C) East Side STP (Stormwater Detention Basin)
Federal wastewater discharge permit (NPDES)	NY0029114
Outlet number	Not provided
Outlet name	Concrete Pipe
Water named in the report	Lake Ontario
Linked waters	lake-ontario-ny
How this report was linked to the water	the water named in the report
Latitude	43.47
Longitude	-76.498
Location source	given in the source record
Location accuracy, in metres	Not provided
Started	Jan 9, 2026, 2:30 PM EST (2026-01-09T14:30:00-05:00)
Ended	Not provided
Detail provided by the source	to the minute
Reported to the source	Jan 9, 2026, 6:53 PM EST (2026-01-09T18:53:29-05:00)
Published	Jan 9, 2026, 6:53 PM EST (2026-01-09T18:53:29-05:00)
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	100,000
Volume as reported	100,000 Gallons Estimated
How volume was determined	estimated
Authority	Oswego (C) East Side STP (Stormwater Detention Basin) (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": "2310865814958575",
    "sprtkAirDateTime": "01/09/2026 23:53:29",
    "notificationStatus": "New",
    "facilityName": "Oswego (C) East Side STP NY0029114  (Stormwater Detention Basin)",
    "facilityId": "NY0029114",
    "countyName": "Oswego",
    "streetNumber": "71",
    "streetName": "Mercer Street",
    "city": "Oswego",
    "addressDescription": "Eastside Wastewater Treatment Facility",
    "latitude": "-76.4981",
    "longitude": "43.4703",
    "sprtkStartDischargeDatetime": "01/09/2026 19:30:00",
    "sprtkEndDischargeDatetime": "01/10/2026 04:59:00",
    "dischargeDuration": "appx. 9.5 Hours - Ongoing",
    "surfaceWater": "Yes",
    "receivingWaterBody": "Lake Ontario",
    "componentDescription": "Concrete Pipe",
    "quantity": "100,000 Gallons Estimated",
    "treatedState": "Partially Treated with Disinfection",
    "dischargeDescription": "Combined Stormwater  (rain + snow melt) & Sanitary Sewage",
    "stepsToContain": "Maximum Flow allowed to enter Main Treatment Plant",
    "geoaddress": "71 Mercer St, Oswego, NY 13126, USA",
    "impactedArea": "Fishing Area - Lake Shore",
    "dischargeReason": "Weather Conditions - Rain and Snow Melt",
    "systemComponent": "CSO Outfall - Concrete Pipe",
    "region": "7",
    "sprtkDischargeWaterFlow": "Manmade",
    "sprtkImpactAreaDesc": "Lake Shore",
    "sprtkExplanation": "Rain and Snow Melt"
  },
  "_tab": "January 2026-August2026",
  "_row": 162,
  "_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": "2026-01-09T23:59:00-05:00",
  "_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:NY0029114|71 mercer street oswego|2026-01-09T19:30Z",
    "basis": "facility + address + start",
    "position": 1,
    "of": 3,
    "head": "ny-dec-sprtk:2310865814958575",
    "latest": "ny-dec-sprtk:2310900174824663"
  }
}

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