Piscataquog River

River in New Hampshire · near Goffstown, Manchester, Weare

Unresolved: no end reported

A discharge here was reported but its end never was. Sources often skip the "ceased" notice, so after the first week the water is shown hatched yellow until 30 days have passed, and the event stays flagged on its pages after that.

Why this colour: Unresolved: no end reported: no end reported. Rationale: From day 7 to day 30 the reach or water is shown hatched yellow 'unresolved: no end reported', listed under active discharges with that label. (source: data/rules.json) How long a water stays coloured, and why

CSO of an unknown time: unresolved, no end reported · City of Manchester DPW Environmental Protection Division · downstream path not modeled · since Nov 1, 2026, 7:23 AM EST

Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14033, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 11:55 UTC · notice

As of Nov 2, 2026, 6:56 AM EST.

Events behind the colour

Unresolved: no end reported Combined sewer overflow · City of Manchester DPW Environmental Protection Division · outfall not stated · not reported (reported Oct 18, 2026, 8:23 AM EDT) to Oct 17, 2026, 8:23 PM EDT · not reported · Unresolved: no end reported, until Nov 17, 2026, 7:23 AM EST
Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14033, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 11:55 UTC · notice
Unresolved: no end reported Combined sewer overflow · City of Manchester DPW Environmental Protection Division · outfall not stated · not reported (reported Oct 12, 2026, 1:53 PM EDT) to Oct 12, 2026, 1:53 AM EDT · not reported · Unresolved: no end reported, until Nov 11, 2026, 12:53 PM EST
Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14023, reported Oct 12, 2026, 1:53 PM EDT, retrieved 2026-11-02 11:55 UTC · notice
Unresolved: no end reported Combined sewer overflow · City of Manchester DPW Environmental Protection Division · outfall not stated · not reported (reported Oct 7, 2026, 5:22 AM EDT) to Oct 6, 2026, 5:22 PM EDT · not reported · Unresolved: no end reported, until Nov 6, 2026, 4:22 AM EST
Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14013, reported Oct 7, 2026, 5:22 AM EDT, retrieved 2026-11-02 11:55 UTC · notice
Unresolved: no end reported Combined sewer overflow · City of Manchester DPW Environmental Protection Division · outfall not stated · not reported (reported Oct 3, 2026, 11:38 PM EDT) to Oct 3, 2026, 11:38 AM EDT · not reported · Unresolved: no end reported, until Nov 2, 2026, 10:38 PM EST
Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14011, reported Oct 3, 2026, 11:38 PM EDT, retrieved 2026-11-02 11:55 UTC · notice

Map

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.

Outfalls are small brown dots.

Modeled downstream reaches on Piscataquog River

No discharge colours a modeled reach on this water now.

Traced outfall paths

No current report NH0100447 outfall 039 · 40 km traced · Model stops here: 40 km cap

Source: paths traced by DirtyWaterWatch on the USGS NLDI / NHDPlus network from each outfall to the head of tide, the first lake or the distance cap; statuses from the events on them.

The last 90 days

Last 90 days, hour by hour. Red: advisory in effect; yellow: caution; hatched yellow: unresolved, no end reported; grey: no current report; hatched purple: a source was not updating.

Unresolved: no end reported: Nov 1, 2026, 8:00 AM EST to now · set by event 1, event 2, event 3, event 4
Caution: Oct 20, 2026, 9:00 PM EDT to Nov 1, 2026, 8:00 AM EST · set by event 1, event 2, event 3
Advisory in effect: Oct 12, 2026, 3:00 PM EDT to Oct 20, 2026, 9:00 PM EDT · set by event 1, event 2
Caution: Sep 29, 2026, 11:00 AM EDT to Oct 12, 2026, 3:00 PM EDT · set by event 1, event 2, event 3, event 4

Source: hourly statuses computed by DirtyWaterWatch (pipeline build/status.py) from the events linked above and the rules on the methods page; history as of 2026-11-02 11:56 UTC.

Discharges over the years

Discharge events, last 12 months8Dec 2025 to Nov 2026; partly covered or sparse source
Days with a discharge, last 12 months15Dec 2025 to Nov 2026; partly covered or sparse source
Hours under advisory, last 12 months376Dec 2025 to Nov 2026; partly covered or sparse source
2026 season under advisory25%May to October, partly covered; 197 h

Discharge events per month

8 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). NH permittees publish on their own pages; each discharger's record begins on a different date.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). Covered 2022-05-03 to 2026-11-02.

Show table

Discharge events per month
Month	Combined sewer overflow	Sanitary sewer overflow	Total	Counted from	Coverage
Jan 2022	0	0	0		No source
Feb 2022	0	0	0		No source
Mar 2022	0	0	0		No source
Apr 2022	0	0	0		No source
May 2022	0	0	0		Partly covered or sparse source
Jun 2022	0	0	0		Partly covered or sparse source
Jul 2022	0	0	0		Partly covered or sparse source
Aug 2022	0	0	0		Partly covered or sparse source
Sep 2022	0	0	0		Partly covered or sparse source
Oct 2022	0	0	0		Partly covered or sparse source
Nov 2022	0	0	0		Partly covered or sparse source
Dec 2022	0	0	0		Partly covered or sparse source
Jan 2023	0	0	0		Partly covered or sparse source
Feb 2023	0	0	0		Partly covered or sparse source
Mar 2023	0	0	0		Partly covered or sparse source
Apr 2023	0	0	0		Partly covered or sparse source
May 2023	0	0	0		Partly covered or sparse source
Jun 2023	0	0	0		Partly covered or sparse source
Jul 2023	0	0	0		Partly covered or sparse source
Aug 2023	0	0	0		Partly covered or sparse source
Sep 2023	0	0	0		Partly covered or sparse source
Oct 2023	0	0	0		Partly covered or sparse source
Nov 2023	0	0	0		Partly covered or sparse source
Dec 2023	0	0	0		Partly covered or sparse source
Jan 2024	0	0	0		Partly covered or sparse source
Feb 2024	0	0	0		Partly covered or sparse source
Mar 2024	0	0	0		Partly covered or sparse source
Apr 2024	0	0	0		Partly covered or sparse source
May 2024	0	0	0		Partly covered or sparse source
Jun 2024	0	0	0		Partly covered or sparse source
Jul 2024	0	0	0		Partly covered or sparse source
Aug 2024	0	0	0		Partly covered or sparse source
Sep 2024	0	0	0		Partly covered or sparse source
Oct 2024	0	0	0		Partly covered or sparse source
Nov 2024	0	0	0		Partly covered or sparse source
Dec 2024	0	0	0		Partly covered or sparse source
Jan 2025	0	0	0		Partly covered or sparse source
Feb 2025	0	0	0		Partly covered or sparse source
Mar 2025	0	0	0		Partly covered or sparse source
Apr 2025	0	0	0		Partly covered or sparse source
May 2025	0	0	0		Partly covered or sparse source
Jun 2025	0	0	0		Partly covered or sparse source
Jul 2025	0	0	0		Partly covered or sparse source
Aug 2025	0	0	0		Partly covered or sparse source
Sep 2025	0	0	0		Partly covered or sparse source
Oct 2025	0	0	0		Partly covered or sparse source
Nov 2025	0	0	0		Partly covered or sparse source
Dec 2025	0	0	0		Partly covered or sparse source
Jan 2026	0	0	0		Partly covered or sparse source
Feb 2026	0	0	0		Partly covered or sparse source
Mar 2026	0	0	0		Partly covered or sparse source
Apr 2026	0	1	1	Source records	Partly covered or sparse source
May 2026	0	0	0		Partly covered or sparse source
Jun 2026	0	0	0		Partly covered or sparse source
Jul 2026	0	0	0		Partly covered or sparse source
Aug 2026	0	0	0		Partly covered or sparse source
Sep 2026	1	0	1	Source records	Partly covered or sparse source
Oct 2026	6	0	6	Source records
Nov 2026	0	0	0

Hours under advisory per month

Hours this water was 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. 5 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. EPA ECHO sewer overflow records are sparse (only what permittees file with EPA). NH permittees publish on their own pages; each discharger's record begins on a different date.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). 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	0	0	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	179	179	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	197	197	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.

No source
Partly covered or sparse source

No source covers 2022-01 to 2022-04.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). 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	0	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	5	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	1	Partly covered or sparse source
Oct 2026	9
Nov 2026	0

Reported volume per year

Gallons, summed from the 1 events that gave a number (7 did not).

Partly covered or sparse source

7 of 8 events gave no volume as a number; only numbers are summed.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). Covered 2022-05-03 to 2026-11-02.

Show table

Reported volume per year
Year	Gallons	Events with a number	Events without	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	0	0	0	Partly covered or sparse source
2026	1,070	1	7	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

5 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.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). 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	0	0.0%	Partly covered or sparse source
2026	376	5.1%	Partly covered or sparse source

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
Season partly covered

Seasons only partly covered by a source: 2026 (share is of the covered hours). 5 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.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). Covered 2022-05-03 to 2026-11-02.

Show table

Share of the May to October season under advisory
Season	Share under advisory	Hours under advisory	Hours covered	Season hours	Partly covered
2026	25.3%	197	780	4,416	yes

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.

Sources: EPA ECHO sewer overflow events; NH permittee notices (Nashua, Manchester, Portsmouth, Exeter). 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	1	0
May	0	0
Jun	0	0
Jul	0	0
Aug	0	0
Sep	1	1
Oct	6	1
Nov	0	1
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)
NH permittee notices (Nashua, Manchester, Portsmouth, Exeter): 2026-09-29 to now

Every event on Piscataquog River

Events placed on Piscataquog River, newest first
Start	End	Discharger	Outfall	Type	Volume	Source	Links
not reported (reported Oct 18, 2026, 8:23 AM EDT)	Oct 17, 2026, 8 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflowrevised	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14032, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 18, 2026, 8:23 AM EDT) · Map
not reported (reported Oct 18, 2026, 8:23 AM EDT)	Oct 17, 2026, 8:23 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14033, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 18, 2026, 8:23 AM EDT) · Map
not reported (reported Oct 14, 2026, 12:08 AM EDT)	Oct 17, 2026, 8 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14026, reported Oct 14, 2026, 12:08 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 14, 2026, 12:08 AM EDT) · Map
not reported (reported Oct 12, 2026, 3:04 PM EDT)	Oct 17, 2026, 8 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14024, reported Oct 12, 2026, 3:04 PM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 12, 2026, 3:04 PM EDT) · Map
not reported (reported Oct 12, 2026, 1:53 PM EDT)	Oct 12, 2026, 1:53 AM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14023, reported Oct 12, 2026, 1:53 PM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 12, 2026, 1:53 PM EDT) · Map
not reported (reported Oct 11, 2026, 9:21 PM EDT)	Oct 12, 2026, 1 AM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflowrevised	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14022, reported Oct 11, 2026, 9:21 PM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 11, 2026, 9:21 PM EDT) · Map
not reported (reported Oct 7, 2026, 5:22 AM EDT)	Oct 6, 2026, 5:22 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14013, reported Oct 7, 2026, 5:22 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 7, 2026, 5:22 AM EDT) · Map
not reported (reported Oct 3, 2026, 11:38 PM EDT)	Oct 3, 2026, 11:38 AM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14011, reported Oct 3, 2026, 11:38 PM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 3, 2026, 11:38 PM EDT) · Map
not reported (reported Oct 3, 2026, 11:39 AM EDT)	Oct 3, 2026, 11 AM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflowrevised	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14010, reported Oct 3, 2026, 11:39 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Oct 3, 2026, 11:39 AM EDT) · Map
not reported (reported Sep 29, 2026, 11:39 AM EDT)	Sep 28, 2026, 11:39 PM EDT	City of Manchester DPW Environmental Protection Division	not stated	Combined sewer overflow	not reported	City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14000, reported Sep 29, 2026, 11:39 AM EDT, retrieved 2026-11-02 11:55 UTC · notice	Event: Combined sewer overflow, City of Manchester DPW Environmental Protection Division, not reported (reported Sep 29, 2026, 11:39 AM EDT) · Map
Apr 10, 2026, 1:00 AM EDT	Apr 14, 2026, 12:00 PM EDT	City of Manchester DPW Environmental Protection Division (Manchester WWTF, 300 Winston St, and 15 CSOs)	not stated	Sanitary sewer overflow	1,070 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 NH0100447:59:1, reported Apr 16, 2026, 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

Outfalls on this water

No outfall in the registry is matched to this water.

Dischargers: City of Manchester DPW Environmental Protection Division (Manchester WWTF, 300 Winston St, and 15 CSOs).

Launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, ODbL). · Piscataquog River on OpenBoatLaunch

Sources covering this water

ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall) · updating · last answered Nov 2, 2026, 6:54 AM EST
ECHO NPDES Sewer Overflow and Bypass Event Dataset (eRule Phase 2, current versions) · updating · last answered Nov 2, 2026, 6:54 AM EST
nh-permittees · updating · last answered Nov 2, 2026, 6:55 AM EST

11 events placed on this water in this build.

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	1	0
May	0	0
Jun	0	0
Jul	0	0
Aug	0	0
Sep	1	1
Oct	6	1
Nov	0	1
Dec	0	0

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	1	0
May	0	0
Jun	0	0
Jul	0	0
Aug	0	0
Sep	1	1
Oct	6	1
Nov	0	1
Dec	0	0

Piscataquog River

Status now

Events behind the colour

Map

Modeled downstream reaches on Piscataquog River

Traced outfall paths

The last 90 days

Discharges over the years

Discharge events per month

Hours under advisory per month

Days with a discharge per month

Reported volume per year

Hours under advisory per year

Share of the May to October season under advisory

Discharge events by calendar month, all years

Every event on Piscataquog River

Outfalls on this water

Launches

Sources covering this water

Month	Events	Years of records
Jan	0	0
Feb	0	0
Mar	0	0
Apr	1	0
May	0	0
Jun	0	0
Jul	0	0
Aug	0	0
Sep	1	1
Oct	6	1
Nov	0	1
Dec	0	0