Vermont / Dischargers /
Town of Northfield WWTF, East St CSO
CSO · Vermont · Northfield
- NPDES permit
- VT0100242
- Outfalls
- 1 with coordinates in the registry
- Receiving waters
- Dog River
- Tracked waters
- none
- Events tracked
- 18 discharges · latest Aug 4, 2020, 5:00 PM EDT
- Volume reported
- no volumes reported
Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 18 event records below, as of 2026-11-02 11:56 UTC.
How it tells the public
None on northfield-vt.gov (Wix site; Water & Sewer page has contact info only). Presumably the state ANR 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)).
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
- 002 · CSO · Dog River · not on a tracked water
Source: EPA ECHO CSO outfall inventory matched to waters (data/outfalls-ne.json).
Event history
| Start | End | Water | Outfall | Type | Volume | Source | Links |
|---|---|---|---|---|---|---|---|
| Aug 4, 2020, 5:00 PM EDT | Aug 4, 2020, 6:30 PM EDT | “Dog River” (not placed) | CSO Outfall | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:5899, 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) | |||||||
| Dec 9, 2019, 8:00 AM EST | Dec 9, 2019, 8:00 AM EST | “Possibly the Dog River” (not placed) | Sewer Treatment Plant | Unclassified record | “Other” | Northfield (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:4803, 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) | |||||||
| Aug 6, 2019, 7:00 PM EDT | Aug 6, 2019, 8:30 PM EDT | “DOG River” (not placed) | East St. | Combined sewer overflow | “>1,000 to 10,000 gallons” | Northfield (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:4675, 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) | |||||||
| not reported (reported Dec 7, 2018, 7:57 AM EST) | not reported | “Dog River” (not placed) | Wastewater Treatment Plant | Bypass | not reported | Northfield (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:1308, reported Dec 7, 2018, 7:57 AM EST, retrieved 2026-11-02 10:55 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 5, 2018, 8:00 AM EST | Dec 5, 2018, 8:10 AM EST | “Dog River” (not placed) | 001 CSO1 | Combined sewer overflow | “>10,000 to 100,000 gallons” | Northfield (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:5990, 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) | |||||||
| not reported (reported Oct 12, 2018, 10:12 AM EDT) | not reported | “Dog River” (not placed) | 242 Dog River Drive outfall | Unclassified record | not reported | Northfield (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:1290, reported Oct 12, 2018, 10:12 AM EDT, retrieved 2026-11-02 10:55 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 10, 2018, 7:35 AM EDT | Oct 10, 2018, 10:55 AM EDT | “Dog River” (not placed) | 242 Dogriver Drive Effluent Outfall | Treatment plant bypass | “>10,000 to 100,000 gallons” | Northfield (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:4500, 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) | |||||||
| Sep 6, 2018, 9:30 AM EDT | Sep 6, 2018, 9:45 AM EDT | “Dog River” (not placed) | East Street outfall | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4458, 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) | |||||||
| Jul 23, 2018, 2:18 PM EDT | Jul 23, 2018, 2:45 AM EDT | “Dog River” (not placed) | East St. CSO | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4404, 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) | |||||||
| Jul 6, 2018, 8:15 AM EDT | Jul 6, 2018, 8:45 AM EDT | “Dog River” (not placed) | East St.. | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4400, 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) | |||||||
| Jul 6, 2018, 4:00 AM EDT | Jul 6, 2018, 4:30 AM EDT | “Dog River” (not placed) | East St. | Sanitary sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4399, 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) | |||||||
| Jun 18, 2018, 5:00 PM EDT | Jun 18, 2018, 5:10 PM EDT | “Dog River” (not placed) | East St. overflow | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4378, 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) | |||||||
| Aug 3, 2017, 5:48 PM EDT | Aug 3, 2017, 6:00 PM EDT | “Dog River” (not placed) | East St. | Sanitary sewer overflow | “>100 to 1,000 gallons” | Northfield (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:4264, 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) | |||||||
| not reported (reported Aug 15, 2016, 7:17 AM EDT) | not reported | “Dog River” (not placed) | East St over flow 004 | Unclassified record | not reported | Northfield (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:29, reported Aug 15, 2016, 7:17 AM EDT, retrieved 2026-11-02 10:55 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 12, 2016, 7:00 PM EDT | Aug 13, 2016, 7:00 AM EDT | “Dog River” (not placed) | East St | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:3079, 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) | |||||||
| not reported (reported Jul 19, 2016, 7:26 AM EDT) | not reported | “Dog River” (not placed) | 004 East St. CSO-004 | Combined sewer overflowrevised | not reported | Northfield (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:22, reported Jul 19, 2016, 7:26 AM EDT, retrieved 2026-11-02 10:55 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 18, 2016, 6:20 PM EDT | Jul 18, 2016, 6:30 PM EDT | “Dog River” (not placed) | 004 East St. CSO 004 | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:3070, 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) | |||||||
| not reported (reported Jul 5, 2016, 9:27 AM EDT) | not reported | “Dog River” (not placed) | 003 East St. CSO-003 | Combined sewer overflow | not reported | Northfield (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:18, reported Jul 5, 2016, 9:27 AM EDT, retrieved 2026-11-02 10:55 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 1, 2016, 7:00 PM EDT | Jul 1, 2016, 8:00 PM EDT | “Dog River” (not placed) | 004 East St. CSO -004 | Combined sewer overflow | “>100 to 1,000 gallons” | Northfield (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:3063, 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) | |||||||
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
0 events, Jan 2022 to Nov 2026.
- 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
| Month | Combined sewer overflow | Sanitary sewer overflow | Bypass, blended or other | Total | Counted from | Coverage |
|---|---|---|---|---|---|---|
| Jan 2022 | 0 | 0 | 0 | 0 | ||
| Feb 2022 | 0 | 0 | 0 | 0 | ||
| Mar 2022 | 0 | 0 | 0 | 0 | ||
| Apr 2022 | 0 | 0 | 0 | 0 | ||
| May 2022 | 0 | 0 | 0 | 0 | ||
| Jun 2022 | 0 | 0 | 0 | 0 | ||
| Jul 2022 | 0 | 0 | 0 | 0 | ||
| Aug 2022 | 0 | 0 | 0 | 0 | ||
| Sep 2022 | 0 | 0 | 0 | 0 | ||
| Oct 2022 | 0 | 0 | 0 | 0 | ||
| Nov 2022 | 0 | 0 | 0 | 0 | ||
| Dec 2022 | 0 | 0 | 0 | 0 | ||
| Jan 2023 | 0 | 0 | 0 | 0 | ||
| Feb 2023 | 0 | 0 | 0 | 0 | ||
| Mar 2023 | 0 | 0 | 0 | 0 | ||
| Apr 2023 | 0 | 0 | 0 | 0 | ||
| May 2023 | 0 | 0 | 0 | 0 | ||
| Jun 2023 | 0 | 0 | 0 | 0 | ||
| Jul 2023 | 0 | 0 | 0 | 0 | ||
| Aug 2023 | 0 | 0 | 0 | 0 | ||
| Sep 2023 | 0 | 0 | 0 | 0 | ||
| Oct 2023 | 0 | 0 | 0 | 0 | ||
| Nov 2023 | 0 | 0 | 0 | 0 | ||
| Dec 2023 | 0 | 0 | 0 | 0 | ||
| Jan 2024 | 0 | 0 | 0 | 0 | ||
| Feb 2024 | 0 | 0 | 0 | 0 | ||
| Mar 2024 | 0 | 0 | 0 | 0 | ||
| Apr 2024 | 0 | 0 | 0 | 0 | ||
| May 2024 | 0 | 0 | 0 | 0 | ||
| Jun 2024 | 0 | 0 | 0 | 0 | ||
| Jul 2024 | 0 | 0 | 0 | 0 | ||
| Aug 2024 | 0 | 0 | 0 | 0 | ||
| Sep 2024 | 0 | 0 | 0 | 0 | ||
| Oct 2024 | 0 | 0 | 0 | 0 | ||
| Nov 2024 | 0 | 0 | 0 | 0 | ||
| Dec 2024 | 0 | 0 | 0 | 0 | ||
| Jan 2025 | 0 | 0 | 0 | 0 | ||
| Feb 2025 | 0 | 0 | 0 | 0 | ||
| Mar 2025 | 0 | 0 | 0 | 0 | ||
| Apr 2025 | 0 | 0 | 0 | 0 | ||
| May 2025 | 0 | 0 | 0 | 0 | ||
| Jun 2025 | 0 | 0 | 0 | 0 | ||
| Jul 2025 | 0 | 0 | 0 | 0 | ||
| Aug 2025 | 0 | 0 | 0 | 0 | ||
| Sep 2025 | 0 | 0 | 0 | 0 | ||
| Oct 2025 | 0 | 0 | 0 | 0 | ||
| Nov 2025 | 0 | 0 | 0 | 0 | ||
| Dec 2025 | 0 | 0 | 0 | 0 | ||
| Jan 2026 | 0 | 0 | 0 | 0 | ||
| Feb 2026 | 0 | 0 | 0 | 0 | ||
| Mar 2026 | 0 | 0 | 0 | 0 | ||
| Apr 2026 | 0 | 0 | 0 | 0 | ||
| May 2026 | 0 | 0 | 0 | 0 | ||
| Jun 2026 | 0 | 0 | 0 | 0 | ||
| Jul 2026 | 0 | 0 | 0 | 0 | ||
| Aug 2026 | 0 | 0 | 0 | 0 | ||
| Sep 2026 | 0 | 0 | 0 | 0 | ||
| Oct 2026 | 0 | 0 | 0 | 0 | ||
| Nov 2026 | 0 | 0 | 0 | 0 |
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
2 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
| Month | Hours under advisory | From discharge windows | Hours in month | Coverage |
|---|---|---|---|---|
| Jan 2022 | 0 | 0 | 744 | |
| Feb 2022 | 0 | 0 | 672 | |
| Mar 2022 | 0 | 0 | 744 | |
| Apr 2022 | 0 | 0 | 720 | |
| May 2022 | 0 | 0 | 744 | |
| Jun 2022 | 0 | 0 | 720 | |
| Jul 2022 | 0 | 0 | 744 | |
| Aug 2022 | 0 | 0 | 744 | |
| Sep 2022 | 0 | 0 | 720 | |
| Oct 2022 | 0 | 0 | 744 | |
| Nov 2022 | 0 | 0 | 720 | |
| Dec 2022 | 0 | 0 | 744 | |
| Jan 2023 | 0 | 0 | 744 | |
| Feb 2023 | 0 | 0 | 672 | |
| Mar 2023 | 0 | 0 | 744 | |
| Apr 2023 | 0 | 0 | 720 | |
| May 2023 | 0 | 0 | 744 | |
| Jun 2023 | 0 | 0 | 720 | |
| Jul 2023 | 0 | 0 | 744 | |
| Aug 2023 | 0 | 0 | 744 | |
| Sep 2023 | 0 | 0 | 720 | |
| Oct 2023 | 0 | 0 | 744 | |
| Nov 2023 | 0 | 0 | 720 | |
| Dec 2023 | 0 | 0 | 744 | |
| Jan 2024 | 0 | 0 | 744 | |
| Feb 2024 | 0 | 0 | 696 | |
| Mar 2024 | 0 | 0 | 744 | |
| Apr 2024 | 0 | 0 | 720 | |
| May 2024 | 0 | 0 | 744 | |
| Jun 2024 | 0 | 0 | 720 | |
| Jul 2024 | 0 | 0 | 744 | |
| Aug 2024 | 0 | 0 | 744 | |
| Sep 2024 | 0 | 0 | 720 | |
| Oct 2024 | 0 | 0 | 744 | |
| Nov 2024 | 0 | 0 | 720 | |
| Dec 2024 | 0 | 0 | 744 | |
| Jan 2025 | 0 | 0 | 744 | |
| Feb 2025 | 0 | 0 | 672 | |
| Mar 2025 | 0 | 0 | 744 | |
| Apr 2025 | 0 | 0 | 720 | |
| May 2025 | 0 | 0 | 744 | |
| Jun 2025 | 0 | 0 | 720 | |
| Jul 2025 | 0 | 0 | 744 | |
| Aug 2025 | 0 | 0 | 744 | |
| Sep 2025 | 0 | 0 | 720 | |
| Oct 2025 | 0 | 0 | 744 | |
| Nov 2025 | 0 | 0 | 720 | |
| Dec 2025 | 0 | 0 | 744 | |
| Jan 2026 | 0 | 0 | 744 | |
| Feb 2026 | 0 | 0 | 672 | |
| Mar 2026 | 0 | 0 | 744 | |
| Apr 2026 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 744 | |
| Jun 2026 | 0 | 0 | 720 | |
| Jul 2026 | 0 | 0 | 744 | |
| Aug 2026 | 0 | 0 | 744 | |
| Sep 2026 | 0 | 0 | 720 | |
| Oct 2026 | 0 | 0 | 744 | |
| Nov 2026 | 0 | 0 | 32 |
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
| Month | Days with a discharge | Coverage |
|---|---|---|
| Jan 2022 | 0 | |
| Feb 2022 | 0 | |
| Mar 2022 | 0 | |
| Apr 2022 | 0 | |
| May 2022 | 0 | |
| Jun 2022 | 0 | |
| Jul 2022 | 0 | |
| Aug 2022 | 0 | |
| Sep 2022 | 0 | |
| Oct 2022 | 0 | |
| Nov 2022 | 0 | |
| Dec 2022 | 0 | |
| Jan 2023 | 0 | |
| Feb 2023 | 0 | |
| Mar 2023 | 0 | |
| Apr 2023 | 0 | |
| May 2023 | 0 | |
| Jun 2023 | 0 | |
| Jul 2023 | 0 | |
| Aug 2023 | 0 | |
| Sep 2023 | 0 | |
| Oct 2023 | 0 | |
| Nov 2023 | 0 | |
| Dec 2023 | 0 | |
| Jan 2024 | 0 | |
| Feb 2024 | 0 | |
| Mar 2024 | 0 | |
| Apr 2024 | 0 | |
| May 2024 | 0 | |
| Jun 2024 | 0 | |
| Jul 2024 | 0 | |
| Aug 2024 | 0 | |
| Sep 2024 | 0 | |
| Oct 2024 | 0 | |
| Nov 2024 | 0 | |
| Dec 2024 | 0 | |
| Jan 2025 | 0 | |
| Feb 2025 | 0 | |
| Mar 2025 | 0 | |
| Apr 2025 | 0 | |
| May 2025 | 0 | |
| Jun 2025 | 0 | |
| Jul 2025 | 0 | |
| Aug 2025 | 0 | |
| Sep 2025 | 0 | |
| Oct 2025 | 0 | |
| Nov 2025 | 0 | |
| Dec 2025 | 0 | |
| Jan 2026 | 0 | |
| Feb 2026 | 0 | |
| Mar 2026 | 0 | |
| Apr 2026 | 0 | |
| May 2026 | 0 | |
| Jun 2026 | 0 | |
| Jul 2026 | 0 | |
| Aug 2026 | 0 | |
| Sep 2026 | 0 | |
| Oct 2026 | 0 | |
| Nov 2026 | 0 |
Discharge events per year, 2016 to 2026
14 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
| Year | Combined sewer overflow | Sanitary sewer overflow | Bypass, blended or other | Total | Coverage |
|---|---|---|---|---|---|
| 2016 | 3 | 0 | 0 | 3 | Partly covered or sparse source |
| 2017 | 0 | 1 | 0 | 1 | |
| 2018 | 5 | 1 | 1 | 7 | |
| 2019 | 1 | 0 | 1 | 2 | |
| 2020 | 1 | 0 | 0 | 1 | |
| 2021 | 0 | 0 | 0 | 0 | |
| 2022 | 0 | 0 | 0 | 0 | |
| 2023 | 0 | 0 | 0 | 0 | |
| 2024 | 0 | 0 | 0 | 0 | |
| 2025 | 0 | 0 | 0 | 0 | |
| 2026 | 0 | 0 | 0 | 0 |
Hours under advisory per year
Hours under advisory each year; 2026 to date.
- Advisory in effect
- Partly covered or sparse source
2 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
| Year | Hours under advisory | Share of the year | Coverage |
|---|---|---|---|
| 2016 | 157 | 1.8% | Partly covered or sparse source |
| 2017 | 48 | 0.6% | |
| 2018 | 249 | 2.8% | |
| 2019 | 50 | 0.6% | |
| 2020 | 50 | 0.6% | |
| 2021 | 0 | 0.0% | |
| 2022 | 0 | 0.0% | |
| 2023 | 0 | 0.0% | |
| 2024 | 0 | 0.0% | |
| 2025 | 0 | 0.0% | |
| 2026 | 0 | 0.0% |
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
| Month | Events | Years of records |
|---|---|---|
| Jan | 0 | 11 |
| Feb | 0 | 11 |
| Mar | 0 | 11 |
| Apr | 0 | 11 |
| May | 0 | 11 |
| Jun | 1 | 11 |
| Jul | 5 | 11 |
| Aug | 4 | 11 |
| Sep | 1 | 11 |
| Oct | 1 | 11 |
| Nov | 0 | 11 |
| Dec | 2 | 10 |
Discharge events by outfall
The 10 outfalls with the most events of 11, all years.
Source: Vermont DEC sewage overflows page. Covered 2016-01-05 to 2026-11-02.
Show table
| Outfall | Events |
|---|---|
| East St. | 3 |
| 004 East St. CSO 004 | 2 |
| CSO Outfall | 1 |
| Sewer Treatment Plant | 1 |
| 001 CSO1 | 1 |
| 242 Dogriver Drive Effluent Outfall | 1 |
| East Street outfall | 1 |
| East St. CSO | 1 |
| East St.. | 1 |
| East St. overflow | 1 |
| Other outfalls (1) | 1 |
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