DirtyWaterWatch

Rhode Island / Waters /

Blackstone River

River in Rhode Island · near Central Falls, Manville, Woonsocket

Status now

Caution

The authority's window has passed but the discharge ended less than 72 hours ago, or a discharge with no reported end began in the last 7 days, or a rainfall advisory is posted. Research on sewage-borne illness points to about three days of raised risk.

Why this colour: Caution: no end reported. Rationale: A discharge record with status unknown (an alert with no incident report, an unparsed notice) is yellow for 14 days from its report time, then unresolved as above. (source: data/rules.json) How long a water stays coloured, and why

Bypass with no reported end · Woonsocket Regional Wastewater Treatment Facility · downstream path not modeled · since May 8, 2025, 5:05 PM EDT

Source: EPA ECHO (reported to regulators) via ri-echo-dfr, record 3683348818, published Oct 30, 2026, 12:00 AM EDT, retrieved 2026-11-02 11:55 UTC · notice

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

Events behind the colour

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 Blackstone River

No discharge colours a modeled reach on this water now.

Traced outfall paths

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.

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
  • 2026 season under advisory0.0%May to October, partly covered; 0 h

Discharge events per month

4 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). EPA ECHO facility-report events for Rhode Island are sparse (only what permittees file with EPA).

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). 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 20230000Partly 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 20250022Source recordsPartly covered or sparse source
Feb 20250000Partly covered or sparse source
Mar 20250000Partly covered or sparse source
Apr 20250000Partly covered or sparse source
May 20250101Source recordsPartly covered or sparse source
Jun 20250000Partly covered or sparse source
Jul 20250011Source recordsPartly 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 20260000

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. 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. EPA ECHO sewer overflow records are sparse (only what permittees file with EPA). EPA ECHO facility-report events for Rhode Island are sparse (only what permittees file with EPA).

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). 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 202300744Partly 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 20255757744Partly covered or sparse source
Feb 202500672Partly covered or sparse source
Mar 202500744Partly covered or sparse source
Apr 202500720Partly covered or sparse source
May 20254848744Partly 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 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.

  • No source
  • Partly covered or sparse source
Sparse sourceSparse source

No source covers 2022-01 to 2022-04.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). 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 20230Partly 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 20252Partly covered or sparse source
Feb 20250Partly covered or sparse source
Mar 20250Partly covered or sparse source
Apr 20250Partly covered or sparse source
May 20251Partly covered or sparse source
Jun 20250Partly covered or sparse source
Jul 20251Partly 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 20260

Reported volume per year

Gallons, summed from the 2 events that gave a number (2 did not).

  • Partly covered or sparse source
Sparse sourceSparse source

2 of 4 events gave no volume as a number; only numbers are summed.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). Covered 2022-05-03 to 2026-11-02.

Show table
Reported volume per year
YearGallonsEvents with a numberEvents withoutCoverage
2022000Partly covered or sparse source
2023000Partly covered or sparse source
2024000Partly covered or sparse source
20251,876,42622Partly 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

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.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). 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
202300.0%Partly covered or sparse source
202400.0%Partly covered or sparse source
20251051.2%Partly covered or sparse source
202600.0%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). 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.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI). Covered 2022-05-03 to 2026-11-02.

Show table
Share of the May to October season under advisory
SeasonShare under advisoryHours under advisoryHours coveredSeason hoursPartly covered
20260.0%06274,416yes

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; EPA ECHO facility reports (RI). Covered 2022-05-03 to 2026-11-02.

Show table
Discharge events by calendar month, all years
MonthEventsYears of records
Jan20
Feb00
Mar00
Apr00
May10
Jun00
Jul10
Aug00
Sep00
Oct01
Nov01
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)
  • EPA ECHO facility reports (RI): 2024-02-11 to now (sparse)
  • Narragansett Bay Commission CSO feed: 2026-10-05 to now

Every event on Blackstone River

Events placed on Blackstone River, newest first
StartEnd Discharger OutfallTypeVolumeSourceLinks
Jul 1, 2025 ended, time not reported Woonsocket Regional Wastewater Treatment Facility not stated Bypass not reported EPA ECHO (reported to regulators) via ri-echo-dfr, record 3683348818, published Oct 30, 2026, 12:00 AM EDT, retrieved 2026-11-02 11:55 UTC · notice Event: Bypass, Woonsocket Regional Wastewater Treatment Facility, Jul 1, 2025 · Map
May 6, 2025, 4:42 PM EDT May 6, 2025, 5:05 PM EDT Woonsocket Sanitary Sewer System not stated Sanitary sewer overflow 1,426 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 RISS00025:1:2, reported May 7, 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
Jan 23, 2025, 10:00 AM EST Jan 23, 2025, 7:00 PM EST Woonsocket Regional Wastewater Treatment Facility not stated Bypass 1.88 million 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 RI0100111:2:1, reported Jan 26, 2025, 7:00 PM EST, 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
Jan 1, 2025 ended, time not reported Woonsocket Regional Wastewater Treatment Facility not stated Bypass not reported EPA ECHO (reported to regulators) via ri-echo-dfr, record 3680273162, published Oct 30, 2026, 12:00 AM EDT, retrieved 2026-11-02 11:55 UTC · notice Event: Bypass, Woonsocket Regional Wastewater Treatment Facility, Jan 1, 2025 · Map

Outfalls on this water

No outfall in the registry is matched to this water.

Dischargers: Narragansett Bay Commission - Bucklin Point WWTF and associated CSOs, Woonsocket Regional Wastewater Treatment Facility.

Launches

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

Sources covering this water

4 events placed on this water in this build.