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Sewage discharges in Rhode Island

34 waters tracked: 0 red, 4 yellow, 0 unresolved, 30 with no current report, as of Nov 2, 2026, 6:56 AM EST. 1 discharge reported in the last 30 days.

Source: DirtyWaterWatch statuses from the 1 feed listed under Coverage below, as of 2026-11-02 11:56 UTC.

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.

Caution Caution: 4 waters

No current report No current report: 30 waters

Dischargers

Coverage

What the authority says about the period after a discharge

48 hours after the discharge ends. Basis: “Narragansett Bay Commission CSO Alarm Map: "During rainstorms and up to 48 hours after a sewage overflow, there may be increased health risks from non-contact recreational activities, such as paddling, fishing, etc."; no statewide rule”

Source: rules.json red.by_state.RI (research/ri/report.md).

How long a water stays coloured, in every state

Feeds we read

31 other sources considered for Rhode Island are listed on the sources page.

Discharges in Rhode Island over the years

  • Discharge events, last 12 months24Dec 2025 to Nov 2026; partly covered or sparse source
  • Days with a discharge, last 12 months24Dec 2025 to Nov 2026; partly covered or sparse source
  • Hours under advisory, last 12 months575Dec 2025 to Nov 2026; on at least one water in the state; partly covered or sparse source
  • 2026 season under advisory8.0%May to October, partly covered; 50 h

Discharge events per month

66 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). The Narragansett Bay Commission feed shows current overflows only; our record begins 2026-10-05.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI); Narragansett Bay Commission CSO feed. 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 20240033Source recordsPartly covered or sparse source
Mar 202406511Source recordsPartly covered or sparse source
Apr 20240134Source recordsPartly covered or sparse source
May 20240022Source recordsPartly covered or sparse source
Jun 20240022Source recordsPartly covered or sparse source
Jul 20240101Source recordsPartly covered or sparse source
Aug 20240011Source recordsPartly covered or sparse source
Sep 20240011Source recordsPartly covered or sparse source
Oct 20240000Partly covered or sparse source
Nov 20240000Partly covered or sparse source
Dec 20240022Source recordsPartly covered or sparse source
Jan 20250022Source recordsPartly covered or sparse source
Feb 20252013Source recordsPartly covered or sparse source
Mar 20250202Source recordsPartly covered or sparse source
Apr 20250011Source recordsPartly covered or sparse source
May 20250123Source recordsPartly covered or sparse source
Jun 20250000Partly covered or sparse source
Jul 20250112Source recordsPartly covered or sparse source
Aug 20250011Source recordsPartly covered or sparse source
Sep 20250000Partly covered or sparse source
Oct 20250011Source recordsPartly covered or sparse source
Nov 20250000Partly covered or sparse source
Dec 20250000Partly covered or sparse source
Jan 20260101Source recordsPartly covered or sparse source
Feb 20260101Source recordsPartly covered or sparse source
Mar 202605813Source recordsPartly covered or sparse source
Apr 20260213Source recordsPartly covered or sparse source
May 20260202Source recordsPartly covered or sparse source
Jun 20260000Partly covered or sparse source
Jul 20260000Partly covered or sparse source
Aug 20261001Source recordsPartly covered or sparse source
Sep 20260202Source recordsPartly covered or sparse source
Oct 20261001Source recordsPartly covered or sparse source
Nov 20260000

Hours under advisory per month

Hours at least one water in the state 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. 29 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. 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). The Narragansett Bay Commission feed shows current overflows only; our record begins 2026-10-05.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI); Narragansett Bay Commission CSO feed. 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 20247272696Partly covered or sparse source
Mar 2024290290744Partly covered or sparse source
Apr 2024136136720Partly covered or sparse source
May 20249696744Partly covered or sparse source
Jun 202400720Partly covered or sparse source
Jul 2024240240744Partly covered or sparse source
Aug 202400744Partly covered or sparse source
Sep 2024203203720Partly covered or sparse source
Oct 2024302302744Partly covered or sparse source
Nov 202400720Partly covered or sparse source
Dec 20247979744Partly covered or sparse source
Jan 20257979744Partly covered or sparse source
Feb 2025105105672Partly covered or sparse source
Mar 20254949744Partly covered or sparse source
Apr 20255555720Partly covered or sparse source
May 2025150150744Partly covered or sparse source
Jun 202500720Partly covered or sparse source
Jul 2025120120744Partly covered or sparse source
Aug 202500744Partly covered or sparse source
Sep 202500720Partly covered or sparse source
Oct 20258282744Partly 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 2026356356744Partly covered or sparse source
Apr 20265252720Partly covered or sparse source
May 2026117117744Partly 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 20265050744Partly 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); Narragansett Bay Commission CSO feed. 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 20243Partly covered or sparse source
Mar 202410Partly covered or sparse source
Apr 20243Partly covered or sparse source
May 20241Partly covered or sparse source
Jun 20241Partly covered or sparse source
Jul 20247Partly covered or sparse source
Aug 20241Partly covered or sparse source
Sep 20249Partly covered or sparse source
Oct 202411Partly covered or sparse source
Nov 20240Partly covered or sparse source
Dec 20242Partly covered or sparse source
Jan 20252Partly covered or sparse source
Feb 20253Partly covered or sparse source
Mar 20252Partly covered or sparse source
Apr 20251Partly covered or sparse source
May 20253Partly covered or sparse source
Jun 20250Partly covered or sparse source
Jul 20253Partly covered or sparse source
Aug 20251Partly covered or sparse source
Sep 20250Partly covered or sparse source
Oct 20253Partly covered or sparse source
Nov 20250Partly covered or sparse source
Dec 20250Partly covered or sparse source
Jan 20261Partly covered or sparse source
Feb 20261Partly covered or sparse source
Mar 202612Partly covered or sparse source
Apr 20262Partly covered or sparse source
May 20264Partly covered or sparse source
Jun 20260Partly covered or sparse source
Jul 20260Partly covered or sparse source
Aug 20261Partly covered or sparse source
Sep 20262Partly covered or sparse source
Oct 20261Partly covered or sparse source
Nov 20260

Reported volume per year

Gallons, summed from the 27 events that gave a number (39 did not).

  • Partly covered or sparse source
Sparse sourceSparse source

39 of 66 events gave no volume as a number; only numbers are summed.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI); Narragansett Bay Commission CSO feed. 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
2024176,295720Partly covered or sparse source
20253,325,72996Partly covered or sparse source
202615,303,3981113Partly 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

29 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.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI); Narragansett Bay Commission CSO feed. 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
20241,41816.1%Partly covered or sparse source
20256397.3%Partly covered or sparse source
20265757.9%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). 29 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.

Sources: EPA ECHO sewer overflow events; EPA ECHO facility reports (RI); Narragansett Bay Commission CSO feed. 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
20268.0%506274,416yes

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); Narragansett Bay Commission CSO feed. Covered 2022-05-03 to 2026-11-02.

Show table
Discharge events by calendar month, all years
MonthEventsYears of records
Jan30
Feb70
Mar260
Apr80
May70
Jun20
Jul30
Aug30
Sep30
Oct21
Nov01
Dec20

Discharge events by outfall

The 1 outfalls with the most events of 1, all years.

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). The Narragansett Bay Commission feed shows current overflows only; our record begins 2026-10-05.

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

Show table
Discharge events by outfall
OutfallEvents
OF 220 OF 220_Moshassuck_Esten1
Outfall not stated65
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

Discharges in the last 30 days

Discharges in Rhode Island in the last 30 days, newest first
StartEnd Water Discharger OutfallTypeVolumeSourceLinks
Oct 5, 2026, 8:50 PM EDT Oct 5, 2026, 11:11 PM EDT “Moshassuck River (inferred)” (not placed) Narragansett Bay Commission - Bucklin Point WWTF and associated CSOs OF 220 OF 220_Moshassuck_Esten Combined sewer overflow not reported Narragansett Bay Commission CSO Alarm Map via NBC CSO Alarm Map live outfall status (JSON), record OF220-20261005T2050, reported Oct 6, 2026, 8:12 AM EDT, retrieved 2026-11-02 11:55 UTC · notice Event: Combined sewer overflow, Narragansett Bay Commission - Bucklin Point WWTF and associated CSOs, Oct 5, 2026, 8:50 PM EDT · Map