DirtyWaterWatch

Vermont / Dischargers /

Town of Windsor Main WWTF (bypass)

BYPASS · Vermont · Windsor

NPDES permit
VT0100919
Outfalls
1 with coordinates in the registry (the state's layer lists 0)
Receiving waters
Connecticut River
Tracked waters
Connecticut River, VT
Events tracked
6 discharges · latest Nov 6, 2025, 9:00 AM EST
Volume reported
400,000 gallons across the 1 discharge that give a volume (5 without one)

Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 6 event records below, as of 2026-11-02 11:56 UTC.

How it tells the public

Not checked beyond the state system | Statewide: every VT permittee must post a public alert at https://anrweb.vt.gov/DEC/WWInventory/SewageOverflows.aspx within 1 hour of discovery (10 V.S.A. § 1295(b)).

Sign up for its notices

Source: the project's research on each operator's notification channel (research/<state>/dischargers.json), checked by fetching the operator's pages.

Outfalls

Source: water outlines from OpenBoatLaunch and OpenStreetMap contributors (ODbL); outfalls from EPA ECHO and the state outfall layers; modeled reaches computed by DirtyWaterWatch from USGS NLDI, NHDPlus and the nearest USGS gauge (Jobson 1996); basemap OpenFreeMap and OpenMapTiles.

1 outfall in the registry
  • 001 123 Pasco Way · CLS · Connecticut River

Source: EPA ECHO CSO outfall inventory matched to waters (data/outfalls-ne.json).

Event history

Events reported for Town of Windsor Main WWTF (bypass), newest first
StartEnd Water OutfallTypeVolumeSourceLinks
Nov 6, 2025, 9:00 AM EST Nov 8, 2025, 2:00 PM EST Connecticut River, VT Main Plant Effluent Treatment plant bypass 400,000 gal Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6936, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
Jul 7, 2022, 12:00 PM EDT Jul 8, 2022, 12:00 PM EDT Connecticut River, VT Windsor Main Plant Final Effluent Treatment plant bypass “>100,000 to 500,000 gallons” Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6184, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
not reported (reported Jul 9, 2021, 12:26 PM EDT) not reported Connecticut River, VT plant outfall at 123 Pasco Way,Windsor, vt Bypassrevised not reported Windsor Main (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:2663, reported Jul 9, 2021, 12:26 PM EDT, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
Jul 8, 2021, 9:00 AM EDT Jul 9, 2021, 1:00 PM EDT Connecticut River, VT 123 Pasco Way Treatment plant bypass “>100,000 to 500,000 gallons” Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6005, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
not reported (reported Nov 8, 2019, 11:38 AM EST) not reported Connecticut River, VT was not a sewer overflow was a suspected to be a bad sample collection main plant Windsor to Connecticut river Sanitary sewer overflowrevised not reported Windsor Main (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:1503, reported Nov 8, 2019, 11:38 AM EST, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
Nov 7, 2019, 7:30 AM EST Nov 12, 2019, 1:45 PM EST Connecticut River, VT Main Plant Unclassified record “bad sample collection” Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:4795, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list
Jul 15, 2019, 7:00 AM EDT Jul 15, 2019, 8:00 AM EDT “none” (not placed) Windsor Industrial Park Sanitary sewer overflow “>1,000 to 10,000 gallons” Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:4664, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below
Full record (older than 180 days, so no page of its own)

This record in the archive list
not reported (reported Oct 26, 2018, 11:30 AM EDT) not reported “Bashan Brook” (not placed) Manhole with a 4" force main( schedule 40 pvc) Sanitary sewer overflowrevised not reported Windsor Main (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:1292, reported Oct 26, 2018, 11:30 AM EDT, retrieved 2026-11-02 10:55 UTC · notice record below
Full record (older than 180 days, so no page of its own)

This record in the archive list
Sep 25, 2018, 12:00 PM EDT Oct 25, 2018, 3:00 PM EDT “Bashan Brook” (not placed) Manhole just south of Industrial Park, 25' off the shoulder of Rt. 5 Sanitary sewer overflow “>1,000 to 10,000 gallons” Windsor Main (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:4486, the source gives no report time, retrieved 2026-11-02 10:55 UTC · notice record below
Full record (older than 180 days, so no page of its own)

This record in the archive list

History

  • Discharge events, last 12 months0Dec 2025 to Nov 2026
  • Days with a discharge, last 12 months0Dec 2025 to Nov 2026
  • Hours under advisory, last 12 months0Dec 2025 to Nov 2026; on this discharger's reports
  • 2026 season under advisory0.0%May to October; 0 h

Discharge events per month

2 events, Jan 2022 to Nov 2026. Counted from 2 verified or annual reports.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Bypass, blended or other

Source: Vermont DEC sewage overflows page. Covered 2022-01-01 to 2026-11-02.

Show table
Discharge events per month
MonthCombined sewer overflowSanitary sewer overflowBypass, blended or otherTotalCounted fromCoverage
Jan 20220000
Feb 20220000
Mar 20220000
Apr 20220000
May 20220000
Jun 20220000
Jul 20220011Verified or annual reports
Aug 20220000
Sep 20220000
Oct 20220000
Nov 20220000
Dec 20220000
Jan 20230000
Feb 20230000
Mar 20230000
Apr 20230000
May 20230000
Jun 20230000
Jul 20230000
Aug 20230000
Sep 20230000
Oct 20230000
Nov 20230000
Dec 20230000
Jan 20240000
Feb 20240000
Mar 20240000
Apr 20240000
May 20240000
Jun 20240000
Jul 20240000
Aug 20240000
Sep 20240000
Oct 20240000
Nov 20240000
Dec 20240000
Jan 20250000
Feb 20250000
Mar 20250000
Apr 20250000
May 20250000
Jun 20250000
Jul 20250000
Aug 20250000
Sep 20250000
Oct 20250000
Nov 20250011Verified or annual reports
Dec 20250000
Jan 20260000
Feb 20260000
Mar 20260000
Apr 20260000
May 20260000
Jun 20260000
Jul 20260000
Aug 20260000
Sep 20260000
Oct 20260000
Nov 20260000

Hours under advisory per month

Hours this discharger's reports put a water under an advisory, by the map's red rules.

  • Advisory in effect

1 discharge events have no reported end and no ongoing status; under the status rules they set caution, not an advisory, and add no hours here. Official beach and cyanobacteria advisories are counted on water pages only.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Hours under advisory per month
MonthHours under advisoryFrom discharge windowsHours in monthCoverage
Jan 202200744
Feb 202200672
Mar 202200744
Apr 202200720
May 202200744
Jun 202200720
Jul 20227272744
Aug 202200744
Sep 202200720
Oct 202200744
Nov 202200720
Dec 202200744
Jan 202300744
Feb 202300672
Mar 202300744
Apr 202300720
May 202300744
Jun 202300720
Jul 202300744
Aug 202300744
Sep 202300720
Oct 202300744
Nov 202300720
Dec 202300744
Jan 202400744
Feb 202400696
Mar 202400744
Apr 202400720
May 202400744
Jun 202400720
Jul 202400744
Aug 202400744
Sep 202400720
Oct 202400744
Nov 202400720
Dec 202400744
Jan 202500744
Feb 202500672
Mar 202500744
Apr 202500720
May 202500744
Jun 202500720
Jul 202500744
Aug 202500744
Sep 202500720
Oct 202500744
Nov 2025101101720
Dec 202500744
Jan 202600744
Feb 202600672
Mar 202600744
Apr 202600720
May 202600744
Jun 202600720
Jul 202600744
Aug 202600744
Sep 202600720
Oct 202600744
Nov 20260032

Days with a discharge per month

A day counts when any counted discharge was under way on it (start to reported end, local time); an event with no end counts its start day.

Source: Vermont DEC sewage overflows page. Covered 2022-01-01 to 2026-11-02.

Show table
Days with a discharge per month
MonthDays with a dischargeCoverage
Jan 20220
Feb 20220
Mar 20220
Apr 20220
May 20220
Jun 20220
Jul 20222
Aug 20220
Sep 20220
Oct 20220
Nov 20220
Dec 20220
Jan 20230
Feb 20230
Mar 20230
Apr 20230
May 20230
Jun 20230
Jul 20230
Aug 20230
Sep 20230
Oct 20230
Nov 20230
Dec 20230
Jan 20240
Feb 20240
Mar 20240
Apr 20240
May 20240
Jun 20240
Jul 20240
Aug 20240
Sep 20240
Oct 20240
Nov 20240
Dec 20240
Jan 20250
Feb 20250
Mar 20250
Apr 20250
May 20250
Jun 20250
Jul 20250
Aug 20250
Sep 20250
Oct 20250
Nov 20253
Dec 20250
Jan 20260
Feb 20260
Mar 20260
Apr 20260
May 20260
Jun 20260
Jul 20260
Aug 20260
Sep 20260
Oct 20260
Nov 20260

Discharge events per year, 2016 to 2026

6 events, 2016 to 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Bypass, blended or other
  • Partly covered or sparse source

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Discharge events per year, 2016 to 2026
YearCombined sewer overflowSanitary sewer overflowBypass, blended or otherTotalCoverage
20160000Partly covered or sparse source
20170000
20180101
20190112
20200000
20210011
20220011
20230000
20240000
20250011
20260000

Reported volume per year

Gallons, summed from the 1 events that gave a number (5 did not).

  • Partly covered or sparse source

5 of 6 events gave no volume as a number (4 gave a range); only numbers are summed. Vermont volumes were range buckets before 2024 (">10,000 to 100,000 gallons"); those records have no number and are not summed.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Reported volume per year
YearGallonsEvents with a numberEvents withoutCoverage
2016000Partly covered or sparse source
2017000
2018001
2019002
2020000
2021001
2022001
2023000
2024000
2025400,00010
2026000

Hours under advisory per year

Hours under advisory each year; 2026 to date.

  • Advisory in effect
  • Partly covered or sparse source

1 discharge events have no reported end and no ongoing status; under the status rules they set caution, not an advisory, and add no hours here. Official beach and cyanobacteria advisories are counted on water pages only.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Hours under advisory per year
YearHours under advisoryShare of the yearCoverage
201600.0%Partly covered or sparse source
201700.0%
20187718.8%
2019490.6%
202000.0%
2021760.9%
2022720.8%
202300.0%
202400.0%
20251011.2%
202600.0%

Share of the May to October season under advisory

Share of the hours from May 1 to October 31 with an advisory in effect.

  • Advisory in effect

1 discharge events have no reported end and no ongoing status; under the status rules they set caution, not an advisory, and add no hours here. Official beach and cyanobacteria advisories are counted on water pages only.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Share of the May to October season under advisory
SeasonShare under advisoryHours under advisoryHours coveredSeason hoursPartly covered
20160.0%04,4164,416
20170.0%04,4164,416
201817.5%7714,4164,416
20191.1%494,4164,416
20200.0%04,4164,416
20211.7%764,4164,416
20221.6%724,4164,416
20230.0%04,4164,416
20240.0%04,4164,416
20250.0%04,4164,416
20260.0%04,4164,416

Discharge events by calendar month, all years

Every counted discharge event, by the calendar month it began.

Months are summed over every year a source covers; the table gives the number of years behind each month.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Discharge events by calendar month, all years
MonthEventsYears of records
Jan011
Feb011
Mar011
Apr011
May011
Jun011
Jul311
Aug011
Sep111
Oct011
Nov211
Dec010

Discharge events by outfall

The 6 outfalls with the most events of 6, all years.

Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.

Show table
Discharge events by outfall
OutfallEvents
Main Plant Effluent1
Windsor Main Plant Final Effluent1
123 Pasco Way1
Main Plant1
Windsor Industrial Park1
Manhole just south of Industrial Park, 25' off the shoulder of Rt. 51
How these charts are counted

Discharge events are counted once: where a source publishes both public notices and verified reports (MassDEP, Vermont DEC), a discharger's month with any verified report counts its verified reports only, and other months count notices. Revisions are folded into the record they revise, and EPA copies of a state report are not counted twice. Monthly and yearly totals (Maine DEP, EPA discharge monitoring reports, Portsmouth) are shown on their own and never added to the event counts. Hours under advisory follow the map's red rules. A muted band marks periods no source covers: a gap there is missing data, not a quiet month.

  • Vermont DEC sewage overflows page: 2016-01-05 to now