DirtyWaterWatch

New Hampshire / Waters /

Pemigewasset River

River in New Hampshire · near Bridgewater, Bristol, Franklin, Holderness, New Hampton

Status now

No current report

At least one source we follow covers this water, and nothing it reports applies right now.

Why this colour: No current report: nothing a covering source reports colours this water now. How long a water stays coloured, and why

Source: ECHO NPDES Sewer Overflow and Bypass Event Dataset (eRule Phase 2, current versions), last answered 2026-11-02 11:54 UTC. Status computed by DirtyWaterWatch as of 2026-11-02 11:56 UTC.

It is not a finding about the water. Discharges go unreported, reports arrive late, and storm runoff carries bacteria too. Follow posted signs and local health advice.

Rivers are not coloured as a whole: a discharge colours a modeled stretch downstream of its outfall, listed below when there is one.

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

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 Pemigewasset River

No discharge colours a modeled reach on this water now.

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.

No red or yellow period in this span.

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 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; 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
Sparse sourceSparse 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.

Show table
Discharge events per month
MonthCombined sewer overflowSanitary sewer overflowBypass, blended or otherTotalCounted fromCoverage
Jan 20220000No source
Feb 20220000No source
Mar 20220000No source
Apr 20220000No source
May 20220000Partly covered or sparse source
Jun 20220000Partly covered or sparse source
Jul 20220000Partly covered or sparse source
Aug 20220000Partly covered or sparse source
Sep 20220000Partly covered or sparse source
Oct 20220000Partly covered or sparse source
Nov 20220000Partly covered or sparse source
Dec 20220000Partly covered or sparse source
Jan 20230000Partly covered or sparse source
Feb 20230000Partly covered or sparse source
Mar 20230000Partly covered or sparse source
Apr 20230000Partly covered or sparse source
May 20230101Source recordsPartly covered or sparse source
Jun 20230000Partly covered or sparse source
Jul 20230000Partly covered or sparse source
Aug 20230000Partly covered or sparse source
Sep 20230000Partly covered or sparse source
Oct 20230000Partly covered or sparse source
Nov 20230000Partly covered or sparse source
Dec 20230000Partly covered or sparse source
Jan 20240000Partly covered or sparse source
Feb 20240000Partly covered or sparse source
Mar 20240000Partly covered or sparse source
Apr 20240000Partly covered or sparse source
May 20240000Partly covered or sparse source
Jun 20240000Partly covered or sparse source
Jul 20240000Partly covered or sparse source
Aug 20240000Partly covered or sparse source
Sep 20240000Partly covered or sparse source
Oct 20240000Partly covered or sparse source
Nov 20240000Partly covered or sparse source
Dec 20240000Partly covered or sparse source
Jan 20250000Partly covered or sparse source
Feb 20250000Partly covered or sparse source
Mar 20250000Partly covered or sparse source
Apr 20250000Partly covered or sparse source
May 20250000Partly covered or sparse source
Jun 20250000Partly covered or sparse source
Jul 20250000Partly covered or sparse source
Aug 20250000Partly covered or sparse source
Sep 20250000Partly covered or sparse source
Oct 20250000Partly covered or sparse source
Nov 20250000Partly covered or sparse source
Dec 20250000Partly covered or sparse source
Jan 20260000Partly covered or sparse source
Feb 20260000Partly covered or sparse source
Mar 20260000Partly covered or sparse source
Apr 20260000Partly covered or sparse source
May 20260000Partly covered or sparse source
Jun 20260000Partly covered or sparse source
Jul 20260000Partly covered or sparse source
Aug 20260000Partly covered or sparse source
Sep 20260000Partly covered or sparse source
Oct 20260000Partly covered or sparse source
Nov 20260000Partly covered or sparse source

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
Sparse sourceSparse 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.

Show table
Hours under advisory per month
MonthHours under advisoryFrom discharge windowsHours in monthCoverage
Jan 202200744No source
Feb 202200672No source
Mar 202200744No source
Apr 202200720No source
May 202200744Partly covered or sparse source
Jun 202200720Partly covered or sparse source
Jul 202200744Partly covered or sparse source
Aug 202200744Partly covered or sparse source
Sep 202200720Partly covered or sparse source
Oct 202200744Partly covered or sparse source
Nov 202200720Partly covered or sparse source
Dec 202200744Partly covered or sparse source
Jan 202300744Partly covered or sparse source
Feb 202300672Partly covered or sparse source
Mar 202300744Partly covered or sparse source
Apr 202300720Partly covered or sparse source
May 20237272744Partly covered or sparse source
Jun 202300720Partly covered or sparse source
Jul 202300744Partly covered or sparse source
Aug 202300744Partly covered or sparse source
Sep 202300720Partly covered or sparse source
Oct 202300744Partly covered or sparse source
Nov 202300720Partly covered or sparse source
Dec 202300744Partly covered or sparse source
Jan 202400744Partly covered or sparse source
Feb 202400696Partly covered or sparse source
Mar 202400744Partly covered or sparse source
Apr 202400720Partly covered or sparse source
May 202400744Partly covered or sparse source
Jun 202400720Partly covered or sparse source
Jul 202400744Partly covered or sparse source
Aug 202400744Partly covered or sparse source
Sep 202400720Partly covered or sparse source
Oct 202400744Partly covered or sparse source
Nov 202400720Partly covered or sparse source
Dec 202400744Partly covered or sparse source
Jan 202500744Partly covered or sparse source
Feb 202500672Partly covered or sparse source
Mar 202500744Partly covered or sparse source
Apr 202500720Partly covered or sparse source
May 202500744Partly covered or sparse source
Jun 202500720Partly covered or sparse source
Jul 202500744Partly covered or sparse source
Aug 202500744Partly covered or sparse source
Sep 202500720Partly covered or sparse source
Oct 202500744Partly covered or sparse source
Nov 202500720Partly covered or sparse source
Dec 202500744Partly covered or sparse source
Jan 202600744Partly covered or sparse source
Feb 202600672Partly covered or sparse source
Mar 202600744Partly covered or sparse source
Apr 202600720Partly covered or sparse source
May 202600744Partly covered or sparse source
Jun 202600720Partly covered or sparse source
Jul 202600744Partly covered or sparse source
Aug 202600744Partly covered or sparse source
Sep 202600720Partly covered or sparse source
Oct 202600744Partly covered or sparse source
Nov 20260032Partly 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
Sparse sourceSparse 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
MonthDays with a dischargeCoverage
Jan 20220No source
Feb 20220No source
Mar 20220No source
Apr 20220No source
May 20220Partly covered or sparse source
Jun 20220Partly covered or sparse source
Jul 20220Partly covered or sparse source
Aug 20220Partly covered or sparse source
Sep 20220Partly covered or sparse source
Oct 20220Partly covered or sparse source
Nov 20220Partly covered or sparse source
Dec 20220Partly covered or sparse source
Jan 20230Partly covered or sparse source
Feb 20230Partly covered or sparse source
Mar 20230Partly covered or sparse source
Apr 20230Partly covered or sparse source
May 20231Partly covered or sparse source
Jun 20230Partly covered or sparse source
Jul 20230Partly covered or sparse source
Aug 20230Partly covered or sparse source
Sep 20230Partly covered or sparse source
Oct 20230Partly covered or sparse source
Nov 20230Partly covered or sparse source
Dec 20230Partly covered or sparse source
Jan 20240Partly covered or sparse source
Feb 20240Partly covered or sparse source
Mar 20240Partly covered or sparse source
Apr 20240Partly covered or sparse source
May 20240Partly covered or sparse source
Jun 20240Partly covered or sparse source
Jul 20240Partly covered or sparse source
Aug 20240Partly covered or sparse source
Sep 20240Partly covered or sparse source
Oct 20240Partly covered or sparse source
Nov 20240Partly covered or sparse source
Dec 20240Partly covered or sparse source
Jan 20250Partly covered or sparse source
Feb 20250Partly covered or sparse source
Mar 20250Partly covered or sparse source
Apr 20250Partly covered or sparse source
May 20250Partly covered or sparse source
Jun 20250Partly covered or sparse source
Jul 20250Partly covered or sparse source
Aug 20250Partly covered or sparse source
Sep 20250Partly covered or sparse source
Oct 20250Partly covered or sparse source
Nov 20250Partly covered or sparse source
Dec 20250Partly covered or sparse source
Jan 20260Partly covered or sparse source
Feb 20260Partly covered or sparse source
Mar 20260Partly covered or sparse source
Apr 20260Partly covered or sparse source
May 20260Partly covered or sparse source
Jun 20260Partly covered or sparse source
Jul 20260Partly covered or sparse source
Aug 20260Partly covered or sparse source
Sep 20260Partly covered or sparse source
Oct 20260Partly covered or sparse source
Nov 20260Partly covered or sparse source

Reported volume per year

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

  • Partly covered or sparse source
Sparse sourceSparse source

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

Show table
Reported volume per year
YearGallonsEvents with a numberEvents withoutCoverage
2022000Partly covered or sparse source
20232,10010Partly covered or sparse source
2024000Partly covered or sparse source
2025000Partly covered or sparse source
2026000Partly 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
Sparse sourceSparse source

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

Show table
Hours under advisory per year
YearHours under advisoryShare of the yearCoverage
202200.0%Partly covered or sparse source
2023720.8%Partly covered or sparse source
202400.0%Partly covered or sparse source
202500.0%Partly covered or sparse source
202600.0%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
MonthEventsYears of records
Jan00
Feb00
Mar00
Apr00
May10
Jun00
Jul00
Aug00
Sep00
Oct00
Nov00
Dec00
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)

Every event on Pemigewasset River

Events placed on Pemigewasset River, newest first
StartEnd Discharger OutfallTypeVolumeSourceLinks
May 17, 2023, 11:30 AM EDT May 17, 2023, 11:33 AM EDT PLYMOUTH SANITARY SEWER SYSTEM not stated Sanitary sewer overflow 2,100 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 NHG580242:3:1, reported May 18, 2023, 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.

Launches

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

Sources covering this water

1 event placed on this water in this build.