City of Chelsea
CSO · Massachusetts · Chelsea
- NPDES permit
- MA0101877
- Outfalls
- 3 with coordinates in the registry
- Receiving waters
- CHELSEA RIVER; MYSTIC RIVER
- Tracked waters
- Mystic River, MA
- Events tracked
- 50 discharges · latest Oct 11, 2026, 10:30 PM EDT
- Volume reported
- 2,216,554 gallons across the 46 discharges that give a volume (4 without one)
Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 50 event records below, as of 2026-11-02 11:56 UTC.
How it tells the public
Chelsea Constant Contact sign-up https://lp.constantcontactpages.com/su/FrwP28o (per MyRWA 2023 guide). MassDEP portal: 90 rows, latest 2026-10-11.
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.
3 outfalls in the registry
- 003 END OF WINNISIMMIT ST · CSO · Outlet Saugus River-Frontal Broad Sound · not on a tracked water
- 004 PEARL ST · CSO · Outlet Saugus River-Frontal Broad Sound · not on a tracked water
- 008 NORTHERN EDGE OF GULF BULK OIL STORAGE · CSO · Outlet Saugus River-Frontal Broad Sound · not on a tracked water
Source: EPA ECHO CSO outfall inventory matched to waters (data/outfalls-ne.json).
Event history
| Start | End | Water | Outfall | Type | Volume | Source | Links |
|---|---|---|---|---|---|---|---|
| Oct 11, 2026, 10:30 PM EDT | ended, time not reported | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record fd704e2d-0bdc-4490-9808-15037e5e0766, published Oct 20, 2026, 6:34 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 10:30 PM EDT · Map |
| Oct 11, 2026, 9:30 PM EDT | Oct 11, 2026, 10:15 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 48,091 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 335f9ae5-d8af-48b7-94ef-ffa733ff03fe, published Oct 20, 2026, 6:43 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 9:30 PM EDT · Map |
| Oct 11, 2026, 9:05 PM EDT | Oct 11, 2026, 10:15 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2c3325e2-e087-4e98-910a-b0f60386e174, published Oct 20, 2026, 6:33 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 9:05 PM EDT · Map |
| Oct 11, 2026, 8:25 PM EDT | ended, time not reported | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 58715ee5-5c6b-4be2-8223-1bbc235b3fa2, published Oct 20, 2026, 6:33 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 8:25 PM EDT · Map |
| Oct 11, 2026, 8:00 PM EDT | Oct 11, 2026, 8:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 313944f6-9ad0-4551-9d05-1537eda60be6, published Oct 20, 2026, 6:34 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 8:00 PM EDT · Map |
| Oct 11, 2026, 6:45 PM EDT | Oct 11, 2026, 8:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 48,092 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 91d53ba4-45b8-4e6a-b46b-f1a0276f1709, published Oct 20, 2026, 6:40 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Oct 11, 2026, 6:45 PM EDT · Map |
| Sep 28, 2026, 8:35 AM EDT | Sep 28, 2026, 8:45 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 2,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c2bcf344-5cf6-4017-9844-3638aa7d5d19, published Oct 5, 2026, 11:40 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Sep 28, 2026, 8:35 AM EDT · Map |
| Sep 28, 2026, 8:35 AM EDT | Sep 28, 2026, 8:45 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ed4bddd3-d08c-4d0c-9350-3ff141629a71, published Sep 30, 2026, 10:22 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Sep 28, 2026, 8:35 AM EDT · Map |
| Sep 27, 2026, 9:20 AM EDT | Sep 27, 2026, 9:35 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 21,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 906514a6-eb65-419d-aceb-bbb0e8a20abf, published Oct 5, 2026, 11:35 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Sep 27, 2026, 9:20 AM EDT · Map |
| Sep 27, 2026, 9:20 AM EDT | Sep 27, 2026, 9:35 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cd83c023-4bae-4338-8c57-58553bbddd47, published Sep 30, 2026, 10:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Sep 27, 2026, 9:20 AM EDT · Map |
| Jul 22, 2026, 4:30 PM EDT | Jul 22, 2026, 4:50 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 196,947 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e506833-21e7-4875-8eac-6c5a11ed2ad1, published Jul 24, 2026, 10:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 22, 2026, 4:30 PM EDT · Map |
| Jul 22, 2026, 4:30 PM EDT | Jul 22, 2026, 4:50 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3224f25f-505b-49f8-8861-9ad4afad7e9b, published Jul 23, 2026, 11:51 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 22, 2026, 4:30 PM EDT · Map |
| Jul 22, 2026, 4:25 PM EDT | Jul 22, 2026, 4:45 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 20,444 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f82e7cdd-81c2-49d2-8ef9-30114516ad78, published Jul 24, 2026, 10:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 22, 2026, 4:25 PM EDT · Map |
| Jul 22, 2026, 4:25 PM EDT | Jul 22, 2026, 4:45 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record dee05342-5514-45ab-bbe3-a5547ca69acc, published Jul 23, 2026, 11:50 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 22, 2026, 4:25 PM EDT · Map |
| Jul 21, 2026, 5:45 PM EDT | Jul 21, 2026, 5:55 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 3,280 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8d971d7d-3955-46aa-ad49-1ec993acd3ef, published Jul 24, 2026, 8:40 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 21, 2026, 5:45 PM EDT · Map |
| Jul 21, 2026, 5:45 PM EDT | ended, time not reported | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b4b38171-499b-4300-8007-01b6a8c0874e, published Jul 21, 2026, 6:05 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 21, 2026, 5:45 PM EDT · Map |
| Jul 21, 2026, 5:45 PM EDT | Jul 21, 2026, 5:55 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 87b005d3-3c5e-41c0-b8e8-b22423f39a77, published Jul 21, 2026, 6:04 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jul 21, 2026, 5:45 PM EDT · Map |
| Jun 30, 2026, 5:55 PM EDT | Jun 30, 2026, 6:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 47,931 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3a5ce3d0-12b5-4148-a001-586c39072f6c, published Jul 2, 2026, 9:38 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jun 30, 2026, 5:55 PM EDT · Map |
| Jun 30, 2026, 5:55 PM EDT | Jun 30, 2026, 6:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 57a6583f-623a-4a39-bf2c-8023c99483a8, published Jun 30, 2026, 6:17 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jun 30, 2026, 5:55 PM EDT · Map |
| Jun 18, 2026, 6:40 PM EDT | Jun 18, 2026, 7:05 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 28,147 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 063a2b7d-f62e-4714-9262-fcea83281029, published Jun 22, 2026, 2:19 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jun 18, 2026, 6:40 PM EDT · Map |
| Jun 18, 2026, 6:40 PM EDT | Jun 18, 2026, 7:05 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 350004b8-93f7-49ab-8098-2a07d8a8c086, published Jun 22, 2026, 8:46 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, CITY OF CHELSEA, Jun 18, 2026, 6:40 PM EDT · Map |
| Oct 8, 2025, 9:05 AM EDT | Oct 8, 2025, 8:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2418063e-f46c-4ed2-b34d-ea7e77167ab7, published Oct 31, 2025, 10:32 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 8, 2025, 9:05 AM EDT | Oct 8, 2025, 8:25 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e0e8cb1-9a6a-46cc-ad7b-37087ff47989, published Oct 31, 2025, 10:31 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 8, 2025, 8:20 AM EDT | Oct 8, 2025, 8:25 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 269 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e7d8191-ba81-4ff5-96da-71dda0d75a52, published Nov 3, 2025, 4:28 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 8, 2025, 8:15 AM EDT | Oct 8, 2025, 8:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 29,967 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8ca6b47f-fd57-4a1c-8ca1-5b077b3e80f2, published Nov 3, 2025, 4:32 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 25, 2025, 10:05 AM EDT | Sep 25, 2025, 10:15 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 6,017 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ed0cb619-6b0c-41e9-944a-f411f9c0a17d, published Oct 2, 2025, 3:16 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 25, 2025, 10:05 AM EDT | Sep 25, 2025, 10:15 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 11,606 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5b9d3ebe-5353-4e98-8459-4e7277ce6c82, published Oct 2, 2025, 3:15 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 25, 2025, 10:05 AM EDT | Sep 25, 2025, 10:15 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4bd8a18d-ebef-4007-ba4c-4eca8c65a134, published Sep 25, 2025, 2:12 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 25, 2025, 10:05 AM EDT | Sep 25, 2025, 10:15 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 428ea9ca-b33f-4ab1-839e-5c37a04b2da1, published Sep 25, 2025, 11:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 6, 2025, 6:15 PM EDT | Sep 6, 2025, 6:25 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 1,711 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4924f29d-3808-459b-8f02-e13dca78c019, published Sep 9, 2025, 5:00 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 6, 2025, 6:15 PM EDT | Sep 6, 2025, 6:25 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 24,632 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 64aea2fe-f351-423e-b46f-db12b8b08958, published Sep 9, 2025, 4:59 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 6, 2025, 6:15 PM EDT | Sep 6, 2025, 6:25 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5f268d89-ca6b-475d-8b73-5d8d631051b9, published Sep 8, 2025, 8:25 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 6, 2025, 6:15 PM EDT | Sep 6, 2025, 6:25 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a4740635-6fe1-47cc-a5fe-0f6c609fef73, published Sep 8, 2025, 8:24 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 21, 2025, 9:35 AM EDT | Aug 21, 2025, 9:35 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 0 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 55ec94e5-d809-49a4-9d0f-7df86cad7116, published Aug 26, 2025, 10:44 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 21, 2025, 9:35 AM EDT | Aug 21, 2025, 9:35 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b78fd66e-4e24-404b-a734-51792dcdf73c, published Aug 21, 2025, 10:40 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 25, 2025, 2:10 PM EDT | Jul 25, 2025, 2:20 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 25,698 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8c1e07f2-c210-48b5-acae-20f056c7a289, published Aug 5, 2025, 9:42 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 17, 2025, 4:25 AM EDT | Mar 17, 2025, 3:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7b77ab18-0b99-4d90-b039-d2f7891aca77, published Mar 17, 2025, 10:03 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 17, 2025, 3:20 AM EDT | Mar 17, 2025, 3:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 2,804 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7cb76578-cb54-4ff3-bc15-0112cb823b9e, published Mar 18, 2025, 6:30 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 11, 2024, 6:40 PM EST | Dec 11, 2024, 6:55 PM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 66,371 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4b5a6e2f-53b9-49cd-a2ea-e8b596675b03, published Dec 13, 2024, 9:58 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 11, 2024, 6:40 PM EST | Dec 11, 2024, 6:55 PM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1b664a98-7059-49a6-95f0-41da2c22c3d7, published Dec 12, 2024, 9:04 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 11, 2024, 6:35 PM EST | Dec 11, 2024, 6:50 PM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 11,852 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 05bbb6cb-cb9f-440f-81fb-f418ee67120d, published Dec 13, 2024, 9:57 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 11, 2024, 6:35 PM EST | Dec 11, 2024, 6:50 PM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d3780439-2a6f-4417-82db-b270f4ddfb79, published Dec 12, 2024, 9:05 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 4, 2024, 3:55 PM EDT | Aug 4, 2024, 4:05 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 3,863 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5910e011-5119-47e4-8896-f7e30773945b, published Aug 13, 2024, 5:22 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 4, 2024, 3:55 PM EDT | Aug 4, 2024, 4:00 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 1,074 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2740d82c-fe6a-4855-8980-3f0c21401e4a, published Aug 13, 2024, 5:21 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 4, 2024, 3:55 PM EDT | Aug 4, 2024, 4:05 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4867c609-be86-4319-bf7f-2586d568da54, published Aug 5, 2024, 11:12 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 4, 2024, 3:55 PM EDT | Aug 4, 2024, 4:00 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7ec13c46-d2a5-49bd-abbd-9fe10bb42306, published Aug 5, 2024, 11:11 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 2, 2024, 4:55 PM EDT | Aug 2, 2024, 5:15 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 5,229 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c1180e0c-8c8b-4260-a657-c1850687fc46, published Aug 13, 2024, 5:22 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 2, 2024, 4:55 PM EDT | Aug 2, 2024, 5:15 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 35ee4d4d-0828-4e20-ada1-ec18e605decd, published Aug 5, 2024, 11:10 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 5, 2024, 7:55 AM EDT | Jul 5, 2024, 8:00 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 12,354 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 489c1bef-9eda-4c0d-af07-678836a43b9b, published Jul 9, 2024, 8:42 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 5, 2024, 7:55 AM EDT | Jul 5, 2024, 8:00 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 61605e06-40c8-4787-a65f-b101749a26ff, published Jul 8, 2024, 10:32 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 5, 2024, 7:50 AM EDT | Jul 5, 2024, 8:00 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 2,776 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c518e6c1-f824-42ce-9d26-40c15ebfe6c8, published Jul 9, 2024, 8:43 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 5, 2024, 7:50 AM EDT | Jul 5, 2024, 8:00 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 740b7627-7da1-4a11-a89f-f27dd3602b22, published Jul 8, 2024, 10:31 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 14, 2024, 1:50 PM EDT | Jun 14, 2024, 2:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 153,999 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 83ac40eb-22df-42fd-8331-b59b5e5feb1e, published Jun 26, 2024, 8:52 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 14, 2024, 1:50 PM EDT | Jun 14, 2024, 2:10 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2a1ca4ba-e103-4ffd-906c-5b7dc9eae807, published Jun 15, 2024, 12:59 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 14, 2024, 1:50 PM EDT | Jun 14, 2024, 1:10 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e770464e-b88f-4770-9588-9581b9ef7618, published Jun 15, 2024, 12:58 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 14, 2024, 12:50 PM EDT | Jun 14, 2024, 1:10 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 12,873 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ef1c8f30-3195-4141-8e8b-e2d3e12ac27f, published Jun 26, 2024, 8:53 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 10, 2024, 4:15 AM EST | Jan 10, 2024, 4:40 AM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6c0c1a56-8a0a-4806-b704-bb4b26f2e56b, published Jan 10, 2024, 10:32 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 10, 2024, 4:05 AM EST | Jan 10, 2024, 4:30 AM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 10,955 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 779817d8-7cf2-4f66-af3c-f509b483eb62, published Jan 11, 2024, 2:18 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 10, 2024, 4:05 AM EST | Jan 10, 2024, 4:30 AM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3b32b66b-fbf7-4ef8-8e0c-6aef63d21738, published Jan 11, 2024, 2:15 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 10, 2024, 4:00 AM EST | Jan 10, 2024, 4:40 AM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 86,920 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6d0955b7-d3fe-4572-8cb4-cd0649c7f4f5, published Jan 11, 2024, 2:16 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 18, 2023, 12:30 PM EST | Dec 18, 2023, 1:30 PM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 0 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 32414f2b-ee22-44e8-908f-573f69047428, published Dec 19, 2023, 6:20 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 18, 2023, 12:30 PM EST | Dec 18, 2023, 1:30 PM EST | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e94c3a5-3677-49dc-9479-719cff70cead, published Dec 19, 2023, 1:22 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 11, 2023, 6:00 AM EST | Nov 11, 2023, 9:00 AM EST | “Back up into private residence” (not placed) | not stated | Sanitary sewer overflow | 40 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9f1e1042-6e5b-4c4f-a719-22d84d7fdc49, published Nov 16, 2023, 8:30 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 8, 2023, 10:30 AM EDT | Aug 8, 2023, 10:30 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 0 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 768fafeb-25d1-460c-ab9b-4c27e0020bed, published Oct 27, 2023, 8:58 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 8, 2023, 10:30 AM EDT | Aug 8, 2023, 11:45 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 116,148 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 052e41bd-d60b-4364-ac65-605cc2cb9b12, published Sep 12, 2023, 4:26 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 8, 2023, 10:30 AM EDT | Aug 8, 2023, 11:45 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2f319927-564e-467c-8aa9-34f82d104f30, published Aug 9, 2023, 11:09 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 8, 2023, 10:30 AM EDT | Aug 8, 2023, 10:30 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 692f7511-6361-4df4-ae39-ca0c33b76488, published Aug 9, 2023, 11:08 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 29, 2023, 5:10 PM EDT | Jul 29, 2023, 6:00 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 598,297 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5a049421-73f4-4ed7-8604-5ba509623492, published Aug 15, 2023, 1:19 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 29, 2023, 5:10 PM EDT | Jul 29, 2023, 6:00 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 592dab5f-0620-4499-98d8-17d1288bb50e, published Jul 31, 2023, 10:10 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 21, 2023, 8:40 PM EDT | Jul 21, 2023, 8:50 PM EDT | Mystic River, MA | CHE003 END OF WINNISIMMIT ST | Combined sewer overflow | 28,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a0cea94f-04d1-4289-aa08-86159e33f935, published Aug 15, 2023, 1:17 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 21, 2023, 8:35 PM EDT | Jul 21, 2023, 10:15 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 228,583 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 29b39ef2-8dc3-4338-ba0a-2876750f37c3, published Aug 15, 2023, 1:11 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 21, 2023, 8:35 PM EDT | Jul 21, 2023, 10:00 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1d4d3eac-a772-4ad8-9bbf-6f0d36911ad5, published Jul 22, 2023, 4:01 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 21, 2023, 8:30 PM EDT | Jul 21, 2023, 10:00 PM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 56,221 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record bbd3a173-81f5-4a08-9d91-5390dc8ce0bb, published Aug 15, 2023, 1:12 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 16, 2023, 12:05 PM EDT | Jul 16, 2023, 12:15 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 8,400 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6b42e76e-1948-4d27-b66d-767a7c89bf0e, published Aug 15, 2023, 12:51 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 16, 2023, 12:05 PM EDT | Jul 16, 2023, 12:15 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cfca125e-fc3a-48d5-9d97-096383540d64, published Jul 17, 2023, 10:36 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 16, 2023, 10:00 AM EDT | Jul 16, 2023, 10:10 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflow | 2,763 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 02fd5cbc-3bb1-4b48-a06b-39c7175f0a20, published Aug 15, 2023, 12:49 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 16, 2023, 10:00 AM EDT | Jul 16, 2023, 10:10 AM EDT | Mystic River, MA | CHE004 PEARL ST | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 256899ad-9f8a-4c6c-8df5-d8c3df454867, published Jul 17, 2023, 2:04 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 10, 2023, 2:30 PM EDT | Jul 10, 2023, 2:45 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 3,200 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 257021da-a19a-4262-8118-bfe027ca5e38, published Aug 15, 2023, 12:46 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 10, 2023, 2:30 PM EDT | Jul 10, 2023, 2:45 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e87fface-db10-439d-9dae-244202bb89bc, published Jul 11, 2023, 11:57 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 14, 2023, 10:55 AM EDT | Mar 14, 2023, 11:05 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 2,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ed9327f5-2ad8-4cf0-bf82-89ee97c00a60, published Oct 27, 2023, 9:08 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 14, 2023, 10:55 AM EDT | Mar 14, 2023, 11:05 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ecd6b411-72c3-41e8-92a5-31a01db65029, published Mar 16, 2023, 4:32 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 30, 2022, 7:25 PM EST | Nov 30, 2022, 7:50 PM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 88,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 54834772-15f8-442b-b342-d881dad173ff, published Jan 19, 2023, 11:34 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 30, 2022, 7:25 PM EST | Nov 30, 2022, 7:50 PM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0c34b2f1-75e0-43a4-8075-51f351a9b9b8, published Dec 13, 2022, 2:29 PM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 30, 2022, 7:25 PM EST | Nov 30, 2022, 7:50 PM EST | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 138fbfea-cd51-4495-8a2a-295e4522f513, published Dec 1, 2022, 10:47 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 14, 2022, 8:35 AM EDT | Oct 14, 2022, 9:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 78,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 825105e8-f0f1-4588-8205-83ba35bde690, published Jan 19, 2023, 11:23 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 14, 2022, 8:35 AM EDT | Oct 14, 2022, 9:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 78,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 00a99de7-03bd-46ad-9333-5e31b8f745e4, published Nov 15, 2022, 9:20 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 14, 2022, 8:35 AM EDT | Oct 14, 2022, 9:30 AM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9454caae-7c4f-451d-a73e-39a227620a85, published Oct 14, 2022, 3:14 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 13, 2022, 8:20 PM EDT | Oct 13, 2022, 8:45 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 21,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 539cd8e3-c8b2-4bfc-aa5e-01f3506a3a55, published Jan 19, 2023, 11:18 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 13, 2022, 8:20 PM EDT | Oct 13, 2022, 8:45 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflow | 21,000 gal | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6da55ab6-a87a-4010-8320-12a79eac5a24, published Nov 15, 2022, 9:13 AM EST, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 13, 2022, 8:20 PM EDT | Oct 13, 2022, 8:45 PM EDT | “CHELSEA RIVER” (not placed) | CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | Combined sewer overflowrevised | not reported | CITY OF CHELSEA (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3646fe98-dd2b-40dc-afb2-516e187ee26c, published Oct 14, 2022, 3:08 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
History
- Discharge events, last 12 months9Dec 2025 to Nov 2026
- Days with a discharge, last 12 months7Dec 2025 to Nov 2026
- Hours under advisory, last 12 months291Dec 2025 to Nov 2026; on this discharger's reports
- 2026 season under advisory6.6%May to October; 291 h
Discharge events per month
46 events, Jan 2022 to Nov 2026. Counted from 46 verified or annual reports.
- Combined sewer overflow
- Sanitary sewer overflow
- Bypass, blended or other
- No source
- Partly covered or sparse source
No source covers 2022-01 to 2022-05. MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| Month | Combined sewer overflow | Sanitary sewer overflow | Bypass, blended or other | Total | Counted from | Coverage |
|---|---|---|---|---|---|---|
| Jan 2022 | 0 | 0 | 0 | 0 | No source | |
| Feb 2022 | 0 | 0 | 0 | 0 | No source | |
| Mar 2022 | 0 | 0 | 0 | 0 | No source | |
| Apr 2022 | 0 | 0 | 0 | 0 | No source | |
| May 2022 | 0 | 0 | 0 | 0 | No source | |
| Jun 2022 | 0 | 0 | 0 | 0 | Partly covered or sparse source | |
| Jul 2022 | 0 | 0 | 0 | 0 | ||
| Aug 2022 | 0 | 0 | 0 | 0 | ||
| Sep 2022 | 0 | 0 | 0 | 0 | ||
| Oct 2022 | 4 | 0 | 0 | 4 | Verified or annual reports | |
| Nov 2022 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Dec 2022 | 0 | 0 | 0 | 0 | ||
| Jan 2023 | 0 | 0 | 0 | 0 | ||
| Feb 2023 | 0 | 0 | 0 | 0 | ||
| Mar 2023 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Apr 2023 | 0 | 0 | 0 | 0 | ||
| May 2023 | 0 | 0 | 0 | 0 | ||
| Jun 2023 | 0 | 0 | 0 | 0 | ||
| Jul 2023 | 7 | 0 | 0 | 7 | Verified or annual reports | |
| Aug 2023 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Sep 2023 | 0 | 0 | 0 | 0 | ||
| Oct 2023 | 0 | 0 | 0 | 0 | ||
| Nov 2023 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Dec 2023 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Jan 2024 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Feb 2024 | 0 | 0 | 0 | 0 | ||
| Mar 2024 | 0 | 0 | 0 | 0 | ||
| Apr 2024 | 0 | 0 | 0 | 0 | ||
| May 2024 | 0 | 0 | 0 | 0 | ||
| Jun 2024 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Jul 2024 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Aug 2024 | 3 | 0 | 0 | 3 | Verified or annual reports | |
| Sep 2024 | 0 | 0 | 0 | 0 | ||
| Oct 2024 | 0 | 0 | 0 | 0 | ||
| Nov 2024 | 0 | 0 | 0 | 0 | ||
| Dec 2024 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Jan 2025 | 0 | 0 | 0 | 0 | ||
| Feb 2025 | 0 | 0 | 0 | 0 | ||
| Mar 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Apr 2025 | 0 | 0 | 0 | 0 | ||
| May 2025 | 0 | 0 | 0 | 0 | ||
| Jun 2025 | 0 | 0 | 0 | 0 | ||
| Jul 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Aug 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Sep 2025 | 4 | 0 | 0 | 4 | Verified or annual reports | |
| Oct 2025 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Nov 2025 | 0 | 0 | 0 | 0 | ||
| Dec 2025 | 0 | 0 | 0 | 0 | ||
| Jan 2026 | 0 | 0 | 0 | 0 | ||
| Feb 2026 | 0 | 0 | 0 | 0 | ||
| Mar 2026 | 0 | 0 | 0 | 0 | ||
| Apr 2026 | 0 | 0 | 0 | 0 | ||
| May 2026 | 0 | 0 | 0 | 0 | ||
| Jun 2026 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Jul 2026 | 3 | 0 | 0 | 3 | Verified or annual reports | |
| Aug 2026 | 0 | 0 | 0 | 0 | ||
| Sep 2026 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Oct 2026 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Nov 2026 | 0 | 0 | 0 | 0 |
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 2022-05. Official beach and cyanobacteria advisories are counted on water pages only. MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| 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 | No source |
| Jun 2022 | 0 | 0 | 720 | Partly covered or sparse source |
| Jul 2022 | 0 | 0 | 744 | |
| Aug 2022 | 0 | 0 | 744 | |
| Sep 2022 | 0 | 0 | 720 | |
| Oct 2022 | 61 | 61 | 744 | |
| Nov 2022 | 5 | 5 | 720 | |
| Dec 2022 | 44 | 44 | 744 | |
| Jan 2023 | 0 | 0 | 744 | |
| Feb 2023 | 0 | 0 | 672 | |
| Mar 2023 | 48 | 48 | 744 | |
| Apr 2023 | 0 | 0 | 720 | |
| May 2023 | 0 | 0 | 744 | |
| Jun 2023 | 0 | 0 | 720 | |
| Jul 2023 | 197 | 197 | 744 | |
| Aug 2023 | 49 | 49 | 744 | |
| Sep 2023 | 0 | 0 | 720 | |
| Oct 2023 | 0 | 0 | 744 | |
| Nov 2023 | 51 | 51 | 720 | |
| Dec 2023 | 49 | 49 | 744 | |
| Jan 2024 | 49 | 49 | 744 | |
| Feb 2024 | 0 | 0 | 696 | |
| Mar 2024 | 0 | 0 | 744 | |
| Apr 2024 | 0 | 0 | 720 | |
| May 2024 | 0 | 0 | 744 | |
| Jun 2024 | 49 | 49 | 720 | |
| Jul 2024 | 48 | 48 | 744 | |
| Aug 2024 | 95 | 95 | 744 | |
| Sep 2024 | 0 | 0 | 720 | |
| Oct 2024 | 0 | 0 | 744 | |
| Nov 2024 | 0 | 0 | 720 | |
| Dec 2024 | 48 | 48 | 744 | |
| Jan 2025 | 0 | 0 | 744 | |
| Feb 2025 | 0 | 0 | 672 | |
| Mar 2025 | 48 | 48 | 744 | |
| Apr 2025 | 0 | 0 | 720 | |
| May 2025 | 0 | 0 | 744 | |
| Jun 2025 | 0 | 0 | 720 | |
| Jul 2025 | 48 | 48 | 744 | |
| Aug 2025 | 48 | 48 | 744 | |
| Sep 2025 | 96 | 96 | 720 | |
| Oct 2025 | 48 | 48 | 744 | |
| Nov 2025 | 0 | 0 | 720 | |
| Dec 2025 | 0 | 0 | 744 | |
| Jan 2026 | 0 | 0 | 744 | |
| Feb 2026 | 0 | 0 | 672 | |
| Mar 2026 | 0 | 0 | 744 | |
| Apr 2026 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 744 | |
| Jun 2026 | 55 | 55 | 720 | |
| Jul 2026 | 113 | 113 | 744 | |
| Aug 2026 | 0 | 0 | 744 | |
| Sep 2026 | 71 | 71 | 720 | |
| Oct 2026 | 52 | 52 | 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 2022-05.
Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| 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 | No source |
| Jun 2022 | 0 | Partly covered or sparse source |
| Jul 2022 | 0 | |
| Aug 2022 | 0 | |
| Sep 2022 | 0 | |
| Oct 2022 | 2 | |
| Nov 2022 | 1 | |
| Dec 2022 | 0 | |
| Jan 2023 | 0 | |
| Feb 2023 | 0 | |
| Mar 2023 | 1 | |
| Apr 2023 | 0 | |
| May 2023 | 0 | |
| Jun 2023 | 0 | |
| Jul 2023 | 4 | |
| Aug 2023 | 1 | |
| Sep 2023 | 0 | |
| Oct 2023 | 0 | |
| Nov 2023 | 1 | |
| Dec 2023 | 1 | |
| Jan 2024 | 1 | |
| Feb 2024 | 0 | |
| Mar 2024 | 0 | |
| Apr 2024 | 0 | |
| May 2024 | 0 | |
| Jun 2024 | 1 | |
| Jul 2024 | 1 | |
| Aug 2024 | 2 | |
| Sep 2024 | 0 | |
| Oct 2024 | 0 | |
| Nov 2024 | 0 | |
| Dec 2024 | 1 | |
| Jan 2025 | 0 | |
| Feb 2025 | 0 | |
| Mar 2025 | 1 | |
| Apr 2025 | 0 | |
| May 2025 | 0 | |
| Jun 2025 | 0 | |
| Jul 2025 | 1 | |
| Aug 2025 | 1 | |
| Sep 2025 | 2 | |
| Oct 2025 | 1 | |
| Nov 2025 | 0 | |
| Dec 2025 | 0 | |
| Jan 2026 | 0 | |
| Feb 2026 | 0 | |
| Mar 2026 | 0 | |
| Apr 2026 | 0 | |
| May 2026 | 0 | |
| Jun 2026 | 2 | |
| Jul 2026 | 2 | |
| Aug 2026 | 0 | |
| Sep 2026 | 2 | |
| Oct 2026 | 1 | |
| Nov 2026 | 0 |
Reported volume per year
Gallons, summed from the 46 events that gave a number.
- Partly covered or sparse source
Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| Year | Gallons | Events with a number | Events without | Coverage |
|---|---|---|---|---|
| 2022 | 286,000 | 5 | 0 | Partly covered or sparse source |
| 2023 | 1,043,652 | 12 | 0 | |
| 2024 | 368,266 | 11 | 0 | |
| 2025 | 102,704 | 9 | 0 | |
| 2026 | 415,932 | 9 | 0 |
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: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| Year | Hours under advisory | Share of the year | Coverage |
|---|---|---|---|
| 2022 | 110 | 1.3% | Partly covered or sparse source |
| 2023 | 395 | 4.5% | |
| 2024 | 290 | 3.3% | |
| 2025 | 289 | 3.3% | |
| 2026 | 291 | 4.0% |
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: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| Month | Events | Years of records |
|---|---|---|
| Jan | 2 | 4 |
| Feb | 0 | 4 |
| Mar | 2 | 4 |
| Apr | 0 | 4 |
| May | 0 | 4 |
| Jun | 4 | 5 |
| Jul | 13 | 5 |
| Aug | 6 | 5 |
| Sep | 6 | 5 |
| Oct | 8 | 5 |
| Nov | 2 | 5 |
| Dec | 3 | 4 |
Discharge events by outfall
The 3 outfalls with the most events of 3, all years.
MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.
Show table
| Outfall | Events |
|---|---|
| CHE008 NORTHERN EDGE OF GULF BULK OIL STORAGE | 30 |
| CHE004 PEARL ST | 14 |
| CHE003 END OF WINNISIMMIT ST | 1 |
| Outfall not stated | 1 |
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.
- MassDEP sewage notification portal: 2022-06-30 to now