City of Lebanon WWTF (CSOs eliminated)

CSO · New Hampshire · Lebanon, Enfield

NPDES permit: NH0100366
Outfalls: 4 with coordinates in the registry (the state's layer lists 0)
Receiving waters: Connecticut River; Mascoma River; Great Brook
Tracked waters: Connecticut River, NH, Mascoma River, NH, Mascoma Lake, NH
Events tracked: 1 discharge · latest Jul 12, 2025, 11:45 PM EDT
Volume reported: 500 gallons across the 1 discharge that give a volume

Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 1 event record below, as of 2026-11-02 11:56 UTC.

How it tells the public

None (no active CSOs)

Outfall layer (source data)

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.

4 outfalls in the registry

023 Mechanic Street · CLS · CONNECTICUT RIVER AND MASCOMA RIVER
024 Seminary Hill Rd · CLS · CONNECTICUT RIVER AND MASCOMA RIVER
026 Manhole south of access road · CLS · CONNECTICUT RIVER AND MASCOMA RIVER
027 Manhole spring st@water st · CLS · GREAT BROOK · not on a tracked water

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

Event history

Events reported for City of Lebanon WWTF (CSOs eliminated), newest first
Start	End	Water	Outfall	Type	Volume	Source	Links
Jul 12, 2025, 11:45 PM EDT	Jul 13, 2025, 12:20 AM EDT	Mascoma Lake, NH	not stated	Sanitary sewer overflow	500 gal	EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset (eRule Phase 2, current versions), record NH0100366:7:1, reported Jul 12, 2025, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	record below · Map
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; partly covered or sparse source
Days with a discharge, last 12 months0Dec 2025 to Nov 2026; partly covered or sparse source
Hours under advisory, last 12 months0Dec 2025 to Nov 2026; on this discharger's reports; partly covered or sparse source

Discharge events per month

1 events, Jan 2022 to Nov 2026.

Combined sewer overflow
Sanitary sewer overflow
Bypass, blended or other
No source
Partly covered or sparse source

No source covers 2022-01 to 2022-04. EPA ECHO sewer overflow records are sparse (only what permittees file with EPA).

Source: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

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Discharge events per month
Month	Sanitary sewer overflow	Total	Counted from	Coverage
Jan 2022	0	0		No source
Feb 2022	0	0		No source
Mar 2022	0	0		No source
Apr 2022	0	0		No source
May 2022	0	0		Partly covered or sparse source
Jun 2022	0	0		Partly covered or sparse source
Jul 2022	0	0		Partly covered or sparse source
Aug 2022	0	0		Partly covered or sparse source
Sep 2022	0	0		Partly covered or sparse source
Oct 2022	0	0		Partly covered or sparse source
Nov 2022	0	0		Partly covered or sparse source
Dec 2022	0	0		Partly covered or sparse source
Jan 2023	0	0		Partly covered or sparse source
Feb 2023	0	0		Partly covered or sparse source
Mar 2023	0	0		Partly covered or sparse source
Apr 2023	0	0		Partly covered or sparse source
May 2023	0	0		Partly covered or sparse source
Jun 2023	0	0		Partly covered or sparse source
Jul 2023	0	0		Partly covered or sparse source
Aug 2023	0	0		Partly covered or sparse source
Sep 2023	0	0		Partly covered or sparse source
Oct 2023	0	0		Partly covered or sparse source
Nov 2023	0	0		Partly covered or sparse source
Dec 2023	0	0		Partly covered or sparse source
Jan 2024	0	0		Partly covered or sparse source
Feb 2024	0	0		Partly covered or sparse source
Mar 2024	0	0		Partly covered or sparse source
Apr 2024	0	0		Partly covered or sparse source
May 2024	0	0		Partly covered or sparse source
Jun 2024	0	0		Partly covered or sparse source
Jul 2024	0	0		Partly covered or sparse source
Aug 2024	0	0		Partly covered or sparse source
Sep 2024	0	0		Partly covered or sparse source
Oct 2024	0	0		Partly covered or sparse source
Nov 2024	0	0		Partly covered or sparse source
Dec 2024	0	0		Partly covered or sparse source
Jan 2025	0	0		Partly covered or sparse source
Feb 2025	0	0		Partly covered or sparse source
Mar 2025	0	0		Partly covered or sparse source
Apr 2025	0	0		Partly covered or sparse source
May 2025	0	0		Partly covered or sparse source
Jun 2025	0	0		Partly covered or sparse source
Jul 2025	1	1	Source records	Partly covered or sparse source
Aug 2025	0	0		Partly covered or sparse source
Sep 2025	0	0		Partly covered or sparse source
Oct 2025	0	0		Partly covered or sparse source
Nov 2025	0	0		Partly covered or sparse source
Dec 2025	0	0		Partly covered or sparse source
Jan 2026	0	0		Partly covered or sparse source
Feb 2026	0	0		Partly covered or sparse source
Mar 2026	0	0		Partly covered or sparse source
Apr 2026	0	0		Partly covered or sparse source
May 2026	0	0		Partly covered or sparse source
Jun 2026	0	0		Partly covered or sparse source
Jul 2026	0	0		Partly covered or sparse source
Aug 2026	0	0		Partly covered or sparse source
Sep 2026	0	0		Partly covered or sparse source
Oct 2026	0	0		Partly covered or sparse source
Nov 2026	0	0		Partly covered or sparse source

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
No source
Partly covered or sparse source

No source covers 2022-01 to 2022-04. Official beach and cyanobacteria advisories are counted on water pages only. EPA ECHO sewer overflow records are sparse (only what permittees file with EPA).

Source: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

Show table

Hours under advisory per month
Month	Hours under advisory	From discharge windows	Hours in month	Coverage
Jan 2022	0	0	744	No source
Feb 2022	0	0	672	No source
Mar 2022	0	0	744	No source
Apr 2022	0	0	720	No source
May 2022	0	0	744	Partly covered or sparse source
Jun 2022	0	0	720	Partly covered or sparse source
Jul 2022	0	0	744	Partly covered or sparse source
Aug 2022	0	0	744	Partly covered or sparse source
Sep 2022	0	0	720	Partly covered or sparse source
Oct 2022	0	0	744	Partly covered or sparse source
Nov 2022	0	0	720	Partly covered or sparse source
Dec 2022	0	0	744	Partly covered or sparse source
Jan 2023	0	0	744	Partly covered or sparse source
Feb 2023	0	0	672	Partly covered or sparse source
Mar 2023	0	0	744	Partly covered or sparse source
Apr 2023	0	0	720	Partly covered or sparse source
May 2023	0	0	744	Partly covered or sparse source
Jun 2023	0	0	720	Partly covered or sparse source
Jul 2023	0	0	744	Partly covered or sparse source
Aug 2023	0	0	744	Partly covered or sparse source
Sep 2023	0	0	720	Partly covered or sparse source
Oct 2023	0	0	744	Partly covered or sparse source
Nov 2023	0	0	720	Partly covered or sparse source
Dec 2023	0	0	744	Partly covered or sparse source
Jan 2024	0	0	744	Partly covered or sparse source
Feb 2024	0	0	696	Partly covered or sparse source
Mar 2024	0	0	744	Partly covered or sparse source
Apr 2024	0	0	720	Partly covered or sparse source
May 2024	0	0	744	Partly covered or sparse source
Jun 2024	0	0	720	Partly covered or sparse source
Jul 2024	0	0	744	Partly covered or sparse source
Aug 2024	0	0	744	Partly covered or sparse source
Sep 2024	0	0	720	Partly covered or sparse source
Oct 2024	0	0	744	Partly covered or sparse source
Nov 2024	0	0	720	Partly covered or sparse source
Dec 2024	0	0	744	Partly covered or sparse source
Jan 2025	0	0	744	Partly covered or sparse source
Feb 2025	0	0	672	Partly covered or sparse source
Mar 2025	0	0	744	Partly covered or sparse source
Apr 2025	0	0	720	Partly covered or sparse source
May 2025	0	0	744	Partly covered or sparse source
Jun 2025	0	0	720	Partly covered or sparse source
Jul 2025	73	73	744	Partly covered or sparse source
Aug 2025	0	0	744	Partly covered or sparse source
Sep 2025	0	0	720	Partly covered or sparse source
Oct 2025	0	0	744	Partly covered or sparse source
Nov 2025	0	0	720	Partly covered or sparse source
Dec 2025	0	0	744	Partly covered or sparse source
Jan 2026	0	0	744	Partly covered or sparse source
Feb 2026	0	0	672	Partly covered or sparse source
Mar 2026	0	0	744	Partly covered or sparse source
Apr 2026	0	0	720	Partly covered or sparse source
May 2026	0	0	744	Partly covered or sparse source
Jun 2026	0	0	720	Partly covered or sparse source
Jul 2026	0	0	744	Partly covered or sparse source
Aug 2026	0	0	744	Partly covered or sparse source
Sep 2026	0	0	720	Partly covered or sparse source
Oct 2026	0	0	744	Partly covered or sparse source
Nov 2026	0	0	32	Partly covered or sparse source

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.

No source
Partly covered or sparse source

No source covers 2022-01 to 2022-04.

Source: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

Show table

Days with a discharge per month
Month	Days with a discharge	Coverage
Jan 2022	0	No source
Feb 2022	0	No source
Mar 2022	0	No source
Apr 2022	0	No source
May 2022	0	Partly covered or sparse source
Jun 2022	0	Partly covered or sparse source
Jul 2022	0	Partly covered or sparse source
Aug 2022	0	Partly covered or sparse source
Sep 2022	0	Partly covered or sparse source
Oct 2022	0	Partly covered or sparse source
Nov 2022	0	Partly covered or sparse source
Dec 2022	0	Partly covered or sparse source
Jan 2023	0	Partly covered or sparse source
Feb 2023	0	Partly covered or sparse source
Mar 2023	0	Partly covered or sparse source
Apr 2023	0	Partly covered or sparse source
May 2023	0	Partly covered or sparse source
Jun 2023	0	Partly covered or sparse source
Jul 2023	0	Partly covered or sparse source
Aug 2023	0	Partly covered or sparse source
Sep 2023	0	Partly covered or sparse source
Oct 2023	0	Partly covered or sparse source
Nov 2023	0	Partly covered or sparse source
Dec 2023	0	Partly covered or sparse source
Jan 2024	0	Partly covered or sparse source
Feb 2024	0	Partly covered or sparse source
Mar 2024	0	Partly covered or sparse source
Apr 2024	0	Partly covered or sparse source
May 2024	0	Partly covered or sparse source
Jun 2024	0	Partly covered or sparse source
Jul 2024	0	Partly covered or sparse source
Aug 2024	0	Partly covered or sparse source
Sep 2024	0	Partly covered or sparse source
Oct 2024	0	Partly covered or sparse source
Nov 2024	0	Partly covered or sparse source
Dec 2024	0	Partly covered or sparse source
Jan 2025	0	Partly covered or sparse source
Feb 2025	0	Partly covered or sparse source
Mar 2025	0	Partly covered or sparse source
Apr 2025	0	Partly covered or sparse source
May 2025	0	Partly covered or sparse source
Jun 2025	0	Partly covered or sparse source
Jul 2025	2	Partly covered or sparse source
Aug 2025	0	Partly covered or sparse source
Sep 2025	0	Partly covered or sparse source
Oct 2025	0	Partly covered or sparse source
Nov 2025	0	Partly covered or sparse source
Dec 2025	0	Partly covered or sparse source
Jan 2026	0	Partly covered or sparse source
Feb 2026	0	Partly covered or sparse source
Mar 2026	0	Partly covered or sparse source
Apr 2026	0	Partly covered or sparse source
May 2026	0	Partly covered or sparse source
Jun 2026	0	Partly covered or sparse source
Jul 2026	0	Partly covered or sparse source
Aug 2026	0	Partly covered or sparse source
Sep 2026	0	Partly covered or sparse source
Oct 2026	0	Partly covered or sparse source
Nov 2026	0	Partly covered or sparse source

Reported volume per year

Gallons, summed from the 1 events that gave a number.

Partly covered or sparse source

Source: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

Show table

Reported volume per year
Year	Gallons	Events with a number	Coverage
2022	0	0	Partly covered or sparse source
2023	0	0	Partly covered or sparse source
2024	0	0	Partly covered or sparse source
2025	500	1	Partly covered or sparse source
2026	0	0	Partly covered or sparse source

Hours under advisory per year

Hours under advisory each year; 2026 to date.

Advisory in effect
Partly covered or sparse source

Official beach and cyanobacteria advisories are counted on water pages only.

Source: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

Show table

Hours under advisory per year
Year	Hours under advisory	Share of the year	Coverage
2022	0	0.0%	Partly covered or sparse source
2023	0	0.0%	Partly covered or sparse source
2024	0	0.0%	Partly covered or sparse source
2025	73	0.8%	Partly covered or sparse source
2026	0	0.0%	Partly covered or sparse source

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: EPA ECHO sewer overflow events. Covered 2022-05-03 to 2026-11-02.

Show table

Discharge events by calendar month, all years
Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	0	0
May	0	0
Jun	0	0
Jul	1	0
Aug	0	0
Sep	0	0
Oct	0	0
Nov	0	0
Dec	0	0

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.

EPA ECHO sewer overflow events: 2022-05-03 to now (sparse)

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	0	0
May	0	0
Jun	0	0
Jul	1	0
Aug	0	0
Sep	0	0
Oct	0	0
Nov	0	0
Dec	0	0

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	0	0
May	0	0
Jun	0	0
Jul	1	0
Aug	0	0
Sep	0	0
Oct	0	0
Nov	0	0
Dec	0	0

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	0	0
May	0	0
Jun	0	0
Jul	1	0
Aug	0	0
Sep	0	0
Oct	0	0
Nov	0	0
Dec	0	0