Massachusetts Water Resources Authority
CSO · Massachusetts · Boston, Cambridge, Somerville, Chelsea, and 39 other member communities
- NPDES permit
- MA0103284
- Outfalls
- 11 with coordinates in the registry (the state's layer lists 10)
- Receiving waters
- CHARLES RIVER; CHARLES RIVER BASIN; FORT POINT CHANNEL; LITTLE RIVER; MYSTIC RIVER
- Tracked waters
- Charles River, MA, Mystic River, MA, Massachusetts Bay, MA, Weymouth Fore River, MA, Ell Pond, MA, Stony Brook, MA, Upper Mystic Lake, MA
- Events tracked
- 331 discharges · latest Oct 12, 2026, 2:54 AM EDT
- Volume reported
- 5,070,961,543 gallons across the 284 discharges that give a volume (47 without one)
Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 331 event records below, as of 2026-11-02 11:56 UTC.
How it tells the public
MWRA CSO Notifications page https://www.mwra.com/node/5699 (notices posted online and sent by email and text); sign-up via Everbridge https://www.mwra.com/updates/everbridge/join.html (per MyRWA guide; not subscribed). MassDEP portal: 584 rows, latest 2026-10-11; median 9.9 h start-to-portal.
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.
11 outfalls in the registry
- 003 165 FT WEST OF ALEWIFE STATION ACCESS RD · CSO · Little River · not on a tracked water
- 010 NORTH OF STORROW DR@MARY'S ST · CSO · Charles River
- 018 NORTH OF STORROW DR @ HEREFORD ST · CSO · Charles River
- 019 NORTH OF STORROW DR BTW EXETER & DARTMOUTH · CSO · Charles River
- 020 715 SW OF HATCH MEMORIAL SHELL · CSO · Charles River
- 023 STORROW DRIVE @MUDDY RIVER · CSO · Charles River
- 215 MWR215: Union Park · TCS · Charles River-Frontal Boston Harbor · not on a tracked water
- C01 MWR201: Cottage Farm · NPD|TCS · ATLANTIC OCEAN (BOSTON HARBOR)
- C03 MWR203: Prison Point · NPD|TCS · ATLANTIC OCEAN (BOSTON HARBOR)
- C05 MWR205: Somerville Marginal Marine · NPD|TCS · ATLANTIC OCEAN (BOSTON HARBOR)
- C25 MWR205A: Somerville Marginal Freshwater · NPD|TCS · ATLANTIC OCEAN (BOSTON HARBOR)
Source: EPA ECHO CSO outfall inventory matched to waters (data/outfalls-ne.json).
Event history
| Start | End | Water | Outfall | Type | Volume | Source | Links |
|---|---|---|---|---|---|---|---|
| Oct 12, 2026, 2:54 AM EDT | Oct 12, 2026, 7:36 AM EDT | Massachusetts Bay, MA | not stated | Bypass | 21.55 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 MA0103284:5:2, reported Oct 12, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Oct 12, 2026, 2:54 AM EDT · Map |
| Oct 12, 2026, 2:27 AM EDT | Oct 12, 2026, 2:42 AM EDT | Massachusetts Bay, MA | not stated | Bypass | 560,000 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 MA0103284:5:1, reported Oct 12, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Oct 12, 2026, 2:27 AM EDT · Map |
| Oct 11, 2026, 9:54 PM EDT | ended, time not reported | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cc473526-3969-4bab-8435-536ad07c817d, published Oct 12, 2026, 12:14 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Oct 11, 2026, 9:54 PM EDT · Map |
| Oct 11, 2026, 9:27 PM EDT | ended, time not reported | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 291e1a76-2ed7-4a95-b9c2-566a5fcb7f22, published Oct 12, 2026, 12:10 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Oct 11, 2026, 9:27 PM EDT · Map |
| Oct 11, 2026, 9:26 PM EDT | ended, time not reported | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 77759ea4-6d4f-4b98-8751-7969067b09c4, published Oct 12, 2026, 12:03 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Oct 11, 2026, 9:26 PM EDT · Map |
| Oct 11, 2026, 8:00 PM EDT | ended, time not reported | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e716b9d4-05cd-416d-b1bd-264f613ff14f, published Oct 12, 2026, 11:58 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Oct 11, 2026, 8:00 PM EDT · Map |
| Sep 28, 2026, 3:02 PM EDT | Sep 28, 2026, 4:21 PM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 1.48 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 MA0103284:4:2, reported Sep 28, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Sep 28, 2026, 3:02 PM EDT · Map |
| Sep 28, 2026, 10:02 AM EDT | Sep 28, 2026, 11:21 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 1.48 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b316bd5e-e263-46a3-a616-66a8a9502ad4, published Oct 8, 2026, 4:19 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 28, 2026, 10:02 AM EDT · Map |
| Sep 28, 2026, 10:02 AM EDT | Sep 28, 2026, 11:21 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1813a511-6b4c-435c-8e0c-87d9370b07da, published Sep 28, 2026, 2:59 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 28, 2026, 10:02 AM EDT · Map |
| Sep 28, 2026, 8:43 AM EDT | Sep 28, 2026, 9:09 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 230,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c5e88853-bab9-4931-bbea-61a5bbbb6010, published Oct 8, 2026, 4:08 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 28, 2026, 8:43 AM EDT · Map |
| Sep 28, 2026, 8:43 AM EDT | Sep 28, 2026, 9:09 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e5d9fd46-70b6-454a-be92-b3563e33c15d, published Sep 28, 2026, 2:58 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 28, 2026, 8:43 AM EDT · Map |
| Sep 27, 2026, 1:36 PM EDT | Sep 27, 2026, 11:30 PM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 90.38 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 MA0103284:4:1, reported Sep 28, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Sep 27, 2026, 1:36 PM EDT · Map |
| Sep 27, 2026, 8:36 AM EDT | Sep 27, 2026, 6:30 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 90.38 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2736acb0-03c1-4289-9862-14a600414b96, published Oct 8, 2026, 4:14 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 8:36 AM EDT · Map |
| Sep 27, 2026, 8:36 AM EDT | Sep 27, 2026, 6:30 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 379d127b-cacb-41a5-8bfd-afd6a6eda7fe, published Sep 27, 2026, 9:22 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 8:36 AM EDT · Map |
| Sep 27, 2026, 8:34 AM EDT | Sep 27, 2026, 3:44 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 28.89 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6ab65d5c-a34d-4d05-9e6f-dc79368c6dcb, published Oct 8, 2026, 4:01 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 8:34 AM EDT · Map |
| Sep 27, 2026, 8:31 AM EDT | Sep 27, 2026, 3:44 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 364208db-effe-45dc-82c5-18ae369beb17, published Sep 27, 2026, 9:20 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 8:31 AM EDT · Map |
| Sep 27, 2026, 7:21 AM EDT | Sep 27, 2026, 4:14 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 3.03 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4ec52936-aba5-43f1-8406-306f9fefe88e, published Oct 8, 2026, 3:58 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 7:21 AM EDT · Map |
| Sep 27, 2026, 7:21 AM EDT | Sep 27, 2026, 4:14 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record eb3d0ea8-881f-4c8f-8bfd-1bd07b57d4a5, published Sep 27, 2026, 9:19 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 27, 2026, 7:21 AM EDT · Map |
| Sep 13, 2026, 12:30 PM EDT | Sep 13, 2026, 12:55 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 570,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e316114c-ec5d-457a-97c5-e66066d05f0e, published Oct 8, 2026, 3:49 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 13, 2026, 12:30 PM EDT · Map |
| Sep 13, 2026, 12:30 PM EDT | Sep 13, 2026, 12:55 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c4417935-367a-46bb-b7f3-9fa70bc2e4cd, published Sep 13, 2026, 6:02 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Sep 13, 2026, 12:30 PM EDT · Map |
| Aug 23, 2026, 1:32 PM EDT | Aug 23, 2026, 2:03 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 840,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4aa80e87-f459-43a8-887e-0e70476dc250, published Sep 9, 2026, 10:44 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Aug 23, 2026, 1:32 PM EDT · Map |
| Aug 23, 2026, 1:32 PM EDT | Aug 23, 2026, 2:03 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3a572fab-aaf7-4cba-ae1a-91a240ef8053, published Aug 23, 2026, 6:01 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Aug 23, 2026, 1:32 PM EDT · Map |
| Jul 29, 2026, 11:54 PM EDT | Jul 30, 2026, 4:22 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 98b5027c-ed2f-46dd-abe9-e4ee1295801f, published Jul 30, 2026, 6:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 29, 2026, 11:54 PM EDT · Map |
| Jul 29, 2026, 11:53 PM EDT | Jul 30, 2026, 4:22 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 960,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 70ae5118-fa37-4133-8ebc-a8c543026578, published Aug 5, 2026, 2:12 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 29, 2026, 11:53 PM EDT · Map |
| Jul 22, 2026, 5:02 PM EDT | Jul 22, 2026, 7:03 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 8.23 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b29927e0-299e-46a0-9241-af33f28a3b33, published Aug 5, 2026, 2:05 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 22, 2026, 5:02 PM EDT · Map |
| Jul 22, 2026, 5:00 PM EDT | Jul 22, 2026, 7:03 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record afd1df1f-108f-4e07-aaef-c39f6fe60205, published Jul 22, 2026, 7:25 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 22, 2026, 5:00 PM EDT · Map |
| Jul 22, 2026, 4:20 PM EDT | Jul 22, 2026, 6:31 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ed4361a5-292a-4790-9460-e823a3a1109d, published Jul 22, 2026, 7:27 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 22, 2026, 4:20 PM EDT · Map |
| Jul 22, 2026, 4:19 PM EDT | Jul 22, 2026, 6:31 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 1.92 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 42ffa418-0a0c-412e-af73-f467236efd7c, published Aug 5, 2026, 2:08 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 22, 2026, 4:19 PM EDT · Map |
| Jul 22, 2026, 2:33 AM EDT | Jul 22, 2026, 3:02 AM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 350,000 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 MA0103284:3:2, reported Jul 21, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Jul 22, 2026, 2:33 AM EDT · Map |
| Jul 22, 2026, 12:15 AM EDT | Jul 22, 2026, 1:22 AM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 1.54 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 MA0103284:3:1, reported Jul 21, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Jul 22, 2026, 12:15 AM EDT · Map |
| Jul 21, 2026, 9:33 PM EDT | Jul 21, 2026, 10:02 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 350,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c1979a75-328b-4bbc-a69a-67a150678534, published Aug 5, 2026, 2:33 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 9:33 PM EDT · Map |
| Jul 21, 2026, 9:33 PM EDT | Jul 21, 2026, 10:02 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 706e2d0b-df1b-4cdf-a1b9-2843ef658f4c, published Jul 22, 2026, 6:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 9:33 PM EDT · Map |
| Jul 21, 2026, 7:22 PM EDT | Jul 21, 2026, 10:34 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 12.29 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8d8cee27-ebe7-48cc-b79a-71ee799edff4, published Aug 5, 2026, 2:02 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 7:22 PM EDT · Map |
| Jul 21, 2026, 7:20 PM EDT | Jul 21, 2026, 10:34 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 430a9ba3-9fc4-40b2-88b0-7111f7d8b77f, published Jul 22, 2026, 6:25 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 7:20 PM EDT · Map |
| Jul 21, 2026, 7:15 PM EDT | Jul 21, 2026, 8:22 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 1.54 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ff8f4348-cc9d-4a3c-8ff4-9153964c39de, published Aug 5, 2026, 2:31 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 7:15 PM EDT · Map |
| Jul 21, 2026, 7:15 PM EDT | Jul 21, 2026, 8:22 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 477a7a4a-3642-4250-a7b5-ab0af1c63386, published Jul 21, 2026, 8:59 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 7:15 PM EDT · Map |
| Jul 21, 2026, 5:51 PM EDT | Jul 21, 2026, 9:54 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 3.02 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d4d4a15c-7213-425d-9ba7-451b992e2d8b, published Aug 5, 2026, 1:57 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 5:51 PM EDT · Map |
| Jul 21, 2026, 5:51 PM EDT | Jul 21, 2026, 9:54 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record df06e7b0-311b-4a20-8ac6-72bd39e2cbb6, published Jul 22, 2026, 6:23 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 21, 2026, 5:51 PM EDT · Map |
| Jul 8, 2026, 12:09 AM EDT | Jul 8, 2026, 4:12 AM EDT | Massachusetts Bay, MA | not stated | Bypass | 20.41 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 MA0103284:2:1, reported Jul 8, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | Event: Bypass, Massachusetts Water Resources Authority, Jul 8, 2026, 12:09 AM EDT · Map |
| Jul 7, 2026, 7:12 PM EDT | Jul 7, 2026, 9:39 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 10.71 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 27f83e10-ae46-4d5c-a608-562a642c85e9, published Aug 5, 2026, 1:52 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 7:12 PM EDT · Map |
| Jul 7, 2026, 7:12 PM EDT | Jul 7, 2026, 9:39 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 504a5dc2-6215-4e68-a045-8e6ffedb3ad5, published Jul 8, 2026, 10:01 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 7:12 PM EDT · Map |
| Jul 7, 2026, 7:09 PM EDT | Jul 7, 2026, 11:12 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 20.41 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b688d153-0044-482d-a643-a875a202c9c3, published Aug 5, 2026, 2:28 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 7:09 PM EDT · Map |
| Jul 7, 2026, 7:09 PM EDT | Jul 7, 2026, 11:12 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f248b89b-dcea-40de-af2b-6e3640aabd1f, published Jul 8, 2026, 10:05 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Blended (partially treated) discharge, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 7:09 PM EDT · Map |
| Jul 7, 2026, 5:54 PM EDT | Jul 7, 2026, 9:18 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 3.49 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9dc8dca8-ba62-4246-90d9-027b71564c44, published Aug 5, 2026, 1:33 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 5:54 PM EDT · Map |
| Jul 7, 2026, 5:54 PM EDT | Jul 7, 2026, 9:18 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 004317ce-d243-4bc3-a70b-122c05906e6b, published Jul 8, 2026, 9:48 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 5:54 PM EDT · Map |
| Jul 7, 2026, 8:44 AM EDT | Jul 7, 2026, 9:29 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 420,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d67fc684-3aa5-4086-97e4-b7e940401e7b, published Aug 5, 2026, 1:48 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 8:44 AM EDT · Map |
| Jul 7, 2026, 8:42 AM EDT | Jul 7, 2026, 9:29 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9b1d8d20-d464-4260-ba28-8520dd6a839b, published Jul 8, 2026, 12:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 7, 2026, 8:42 AM EDT · Map |
| Jul 4, 2026, 7:09 PM EDT | Jul 4, 2026, 7:36 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 70,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d342c906-793e-409c-bb32-8979bc97615c, published Aug 5, 2026, 12:52 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 4, 2026, 7:09 PM EDT · Map |
| Jul 4, 2026, 7:09 PM EDT | Jul 4, 2026, 7:36 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record aef5b36c-b157-4abe-b510-33baa8efb01d, published Jul 4, 2026, 10:58 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jul 4, 2026, 7:09 PM EDT · Map |
| Jun 18, 2026, 6:34 PM EDT | Jun 18, 2026, 7:33 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 40,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 94917c77-aa62-4dcf-a84f-d716fb9a6297, published Jul 8, 2026, 2:18 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jun 18, 2026, 6:34 PM EDT · Map |
| Jun 18, 2026, 6:33 PM EDT | Jun 18, 2026, 7:33 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record af5c49ad-6f9c-41ed-99c7-f1163a6a485e, published Jun 18, 2026, 9:30 PM EDT, retrieved 2026-11-02 10:58 UTC · notice | Event: Combined sewer overflow, MASSACHUSETTS WATER RESOURCES AUTHORITY, Jun 18, 2026, 6:33 PM EDT · Map |
| Mar 16, 2026, 11:18 PM EDT | Mar 17, 2026, 2:07 AM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 5.98 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 MA0103284:1:2, reported Mar 19, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 16, 2026, 10:18 PM EDT | Mar 17, 2026, 1:07 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 5.98 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2f87493f-2e45-4e3f-9890-808b2087d0f7, published Apr 8, 2026, 10:33 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 16, 2026, 10:18 PM EDT | Mar 17, 2026, 1:07 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record bdfc7578-67c1-4a51-911d-10b5910a83bd, published Mar 17, 2026, 7:40 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) | |||||||
| Mar 16, 2026, 9:48 AM EDT | Mar 16, 2026, 10:53 AM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 3.23 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record dbaa184b-e88c-42f3-b748-7fbe4773676c, published Apr 8, 2026, 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) | |||||||
| Mar 16, 2026, 9:45 AM EDT | Mar 16, 2026, 10:53 AM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1213018a-d146-417b-9003-6180e57c94ab, published Mar 16, 2026, 8:55 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) | |||||||
| Mar 16, 2026, 9:36 AM EDT | Mar 16, 2026, 12:30 PM EDT | Massachusetts Bay, MA | not stated | Bypassrevised | 10.09 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 MA0103284:1:1, reported Mar 19, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 16, 2026, 8:36 AM EDT | Mar 16, 2026, 11:30 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 10.09 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record edc15fe9-da0e-45de-bdcd-06113a26da66, published Apr 8, 2026, 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) | |||||||
| Mar 16, 2026, 8:36 AM EDT | Mar 16, 2026, 11:30 AM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8036b7ad-92cb-4c33-aa57-65a5e0cee09c, published Mar 16, 2026, 8:55 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) | |||||||
| Mar 16, 2026, 7:56 AM EDT | Mar 16, 2026, 9:48 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 500,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 19e1d000-50cd-41cf-a47b-91dc61e65641, published Apr 8, 2026, 10:30 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 16, 2026, 7:56 AM EDT | Mar 16, 2026, 9:48 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1411c46a-7139-4c31-a020-30144d69ad8c, published Mar 16, 2026, 8:54 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 29, 2025, 2:12 PM EST | Dec 29, 2025, 5:11 PM EST | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 130,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7bd6f1e7-f653-4595-9621-21851ce4ba16, published Jan 7, 2026, 8:14 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 29, 2025, 2:12 PM EST | Dec 29, 2025, 5:11 PM EST | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cce664e7-6da2-4819-8e9a-718605740158, published Dec 29, 2025, 9:21 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 30, 2025, 10:18 PM EDT | Oct 30, 2025, 11:13 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 56eb7611-308e-46a1-a111-fa90c72fea95, published Oct 31, 2025, 2:11 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) | |||||||
| Oct 30, 2025, 10:17 PM EDT | Oct 30, 2025, 11:13 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 940,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 31b2c5ac-67c2-42e6-9c66-9a5bbd0442ac, published Nov 12, 2025, 9:36 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 22, 2025, 8:55 AM EDT | Oct 22, 2025, 10:30 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 390,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 32aaed7f-4f2d-466d-b654-a8869c0bb0f0, published Nov 12, 2025, 9:34 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) | |||||||
| Oct 22, 2025, 8:55 AM EDT | Oct 22, 2025, 10:30 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 85d733b6-2e6a-4881-af32-af094207aa3b, published Oct 22, 2025, 2:40 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 20, 2025, 12:52 PM EDT | Oct 20, 2025, 1:48 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 440,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 6540e804-4adf-465a-9e93-2e73cc9870e2, published Nov 12, 2025, 9:41 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 20, 2025, 12:52 PM EDT | Oct 20, 2025, 1:48 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f30a90cf-c3b2-47d9-8128-32c8ad2ac80d, published Oct 20, 2025, 4:31 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 20, 2025, 11:53 AM EDT | Oct 20, 2025, 2:36 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 20037fa2-a8a8-4113-a274-f72695b2864c, published Oct 20, 2025, 4:30 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) | |||||||
| Oct 20, 2025, 11:52 AM EDT | Oct 20, 2025, 2:36 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 330,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7a05c399-a5d2-4941-a222-fb89ad6d3b3f, published Nov 12, 2025, 9:32 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) | |||||||
| Oct 13, 2025, 3:09 PM EDT | Oct 13, 2025, 6:43 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 12.84 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1ca77fa8-6278-46df-8b9d-42df2468918c, published Nov 12, 2025, 9:16 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, 2025, 3:07 PM EDT | Oct 13, 2025, 6:43 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 29f793f2-6efc-4f15-afd3-b4ac360eee42, published Oct 14, 2025, 8:15 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 13, 2025, 2:29 PM EDT | Oct 13, 2025, 9:14 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 1.04 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 894507d9-6d84-4a2f-bc20-3535168983ed, published Nov 12, 2025, 8:47 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 13, 2025, 2:29 PM EDT | Oct 13, 2025, 9:14 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9d8d78b7-ac0f-4c93-96ce-4f42d51cfaf7, published Oct 14, 2025, 8:06 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 13, 2025, 1:59 PM EDT | Oct 13, 2025, 9:35 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 35.15 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 200fc37c-2d68-4ff5-a4e9-782acbe62217, published Nov 12, 2025, 9:39 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, 2025, 1:59 PM EDT | Oct 13, 2025, 9:35 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 31c589e6-8950-47fc-904b-4267b1d65a64, published Oct 14, 2025, 8:02 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, 11:01 AM EDT | Oct 8, 2025, 12:25 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 3.39 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 05af9364-56c5-47c2-ade4-497cdf777329, published Nov 12, 2025, 9:38 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 8, 2025, 11:01 AM EDT | Oct 8, 2025, 12:25 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e55de277-7985-4657-8c41-8f212a4ee6e0, published Oct 8, 2025, 12:57 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 8, 2025, 10:20 AM EDT | Oct 8, 2025, 1:03 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 9.8 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f94ad48a-5fa4-46f0-a39f-890445d0007d, published Nov 12, 2025, 8:46 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 8, 2025, 10:16 AM EDT | Oct 8, 2025, 1:03 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 28103bfc-c4b0-4434-94fd-a2785abc996a, published Oct 8, 2025, 3:56 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 8, 2025, 8:58 AM EDT | Oct 8, 2025, 10:46 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 1.71 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ff130865-cd4c-4ef3-8f41-9f29c995dcc0, published Nov 12, 2025, 8:41 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 8, 2025, 8:55 AM EDT | Oct 8, 2025, 10:46 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f5a13362-7dc2-47cf-83de-1b7688450a22, published Oct 8, 2025, 3:52 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, 10:31 AM EDT | Sep 25, 2025, 12:53 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ca499395-58f1-48b1-9bc0-26a534614919, published Sep 26, 2025, 7:56 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 25, 2025, 10:30 AM EDT | Sep 25, 2025, 12:53 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 9.22 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 00c983f3-28c0-4f75-8738-cc502bef2776, published Oct 20, 2025, 4:52 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, 10:23 AM EDT | Sep 25, 2025, 12:17 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 4.08 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record bbbc6e9a-b2a9-42bf-b1f4-c1792acc4e79, published Oct 20, 2025, 4:41 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, 10:23 AM EDT | Sep 25, 2025, 12:17 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 86e4f432-4476-44e2-bb34-ca7beb1ede45, published Sep 26, 2025, 7:57 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) | |||||||
| Sep 25, 2025, 9:32 AM EDT | Sep 25, 2025, 12:04 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 1.97 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ba013e31-f127-4e43-807d-d47a13f3d775, published Oct 20, 2025, 4:51 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) | |||||||
| Sep 25, 2025, 9:32 AM EDT | Sep 25, 2025, 12:04 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 65cc77d1-277e-4c67-bc7e-6a13f902f980, published Sep 26, 2025, 7:55 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 18, 2025, 3:28 AM EDT | Sep 18, 2025, 4:05 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 450,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c95bdf2f-1971-4fe3-b5c0-ecee639eafce, published Oct 20, 2025, 4:49 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) | |||||||
| Sep 18, 2025, 3:28 AM EDT | Sep 18, 2025, 4:05 AM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 18321db7-ea1c-4426-8af4-bb67894682a3, published Sep 18, 2025, 12:32 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) | |||||||
| Sep 7, 2025, 11:05 AM EDT | Sep 7, 2025, 1:07 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 360,000 gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d76a73de-9e11-437d-aca4-bb4da3f3c3ed, published Oct 20, 2025, 4:48 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 7, 2025, 11:05 AM EDT | Sep 7, 2025, 1:07 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3c39d50c-57c8-4194-9db1-a9cdc9d68011, published Sep 7, 2025, 9:40 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, 7:21 PM EDT | Sep 6, 2025, 9:07 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflow | 6.16 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 108b1d8e-3a9f-4f91-a42e-ee27c135d6b6, published Oct 20, 2025, 4:44 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, 7:19 PM EDT | Sep 6, 2025, 9:07 PM EDT | Charles River, MA | MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7e1626fd-d903-4e67-ab82-4f24ef3ddc79, published Sep 7, 2025, 11:20 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, 7:13 PM EDT | Sep 6, 2025, 8:35 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) discharge | 3.55 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ddfac4dd-1fbb-4bf1-81e6-743ba7c38ab0, published Oct 20, 2025, 4:35 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, 7:13 PM EDT | Sep 6, 2025, 8:35 PM EDT | Massachusetts Bay, MA | T01 | Blended (partially treated) dischargerevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e8bcf48-4205-48b9-b871-b7d7bab0044c, published Sep 7, 2025, 11:22 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, 5:47 PM EDT | Sep 6, 2025, 7:41 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 690ab939-194e-4e2f-a808-119645f33539, published Sep 7, 2025, 11:19 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, 5:46 PM EDT | Sep 6, 2025, 7:41 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflow | 3.74 million gal | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b9ab83cd-48ea-493c-9ad6-ef440ba113a7, published Oct 20, 2025, 4:43 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 14, 2025, 6:42 PM EDT | Aug 14, 2025, 7:27 PM EDT | Mystic River, MA | MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | Combined sewer overflowrevised | not reported | MASSACHUSETTS WATER RESOURCES AUTHORITY (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c4035618-356e-475f-8f80-c64441fa8204, published Aug 15, 2025, 9:14 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) | |||||||
Showing the newest 100 events of 586 events. See them all with filters.
History
- Discharge events, last 12 months32Dec 2025 to Nov 2026
- Days with a discharge, last 12 months17Dec 2025 to Nov 2026
- Hours under advisory, last 12 months633Dec 2025 to Nov 2026; on this discharger's reports
- 2026 season under advisory12%May to October; 517 h
Discharge events per month
288 events, Jan 2022 to Nov 2026. Counted from 281 verified or annual reports, 4 public notices, 3 other source reports.
- Combined sewer overflow
- Sanitary sewer overflow
- Bypass, blended or other
- No source
- Partly covered or sparse source
No source covers 2022-01 to 2022-04. EPA ECHO sewer overflow records are sparse (only what permittees file with EPA). MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Sources: EPA ECHO sewer overflow events; MassDEP sewage notification portal. Covered 2022-05-03 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 | Partly covered or sparse source | |
| Jun 2022 | 0 | 0 | 0 | 0 | Partly covered or sparse source | |
| Jul 2022 | 0 | 0 | 0 | 0 | ||
| Aug 2022 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Sep 2022 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Oct 2022 | 3 | 0 | 1 | 4 | Verified or annual reports | |
| Nov 2022 | 4 | 0 | 1 | 5 | Verified or annual reports | |
| Dec 2022 | 5 | 0 | 4 | 9 | Verified or annual reports | |
| Jan 2023 | 4 | 0 | 3 | 7 | Verified or annual reports | |
| Feb 2023 | 0 | 0 | 0 | 0 | ||
| Mar 2023 | 5 | 0 | 2 | 7 | Verified or annual reports | |
| Apr 2023 | 2 | 0 | 1 | 3 | Verified or annual reports | |
| May 2023 | 5 | 0 | 1 | 6 | Verified or annual reports | |
| Jun 2023 | 5 | 0 | 0 | 5 | Verified or annual reports | |
| Jul 2023 | 22 | 0 | 8 | 30 | Verified or annual reports | |
| Aug 2023 | 18 | 2 | 3 | 23 | Verified or annual reports | |
| Sep 2023 | 3 | 0 | 2 | 5 | Verified or annual reports | |
| Oct 2023 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Nov 2023 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Dec 2023 | 8 | 1 | 3 | 12 | Verified or annual reports | |
| Jan 2024 | 12 | 10 | 5 | 27 | Verified or annual reports | |
| Feb 2024 | 0 | 0 | 0 | 0 | ||
| Mar 2024 | 10 | 3 | 6 | 19 | Verified or annual reports | |
| Apr 2024 | 3 | 2 | 3 | 8 | Verified or annual reports | |
| May 2024 | 7 | 0 | 1 | 8 | Verified or annual reports | |
| Jun 2024 | 8 | 0 | 1 | 9 | 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 | 2 | 0 | 0 | 2 | Verified or annual reports | |
| Dec 2024 | 4 | 0 | 2 | 6 | Verified or annual reports | |
| Jan 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Feb 2025 | 1 | 0 | 2 | 3 | Verified or annual reports | |
| Mar 2025 | 5 | 0 | 3 | 8 | Verified or annual reports | |
| Apr 2025 | 3 | 0 | 1 | 4 | Verified or annual reports | |
| May 2025 | 6 | 0 | 2 | 8 | Verified or annual reports | |
| Jun 2025 | 2 | 0 | 1 | 3 | Verified or annual reports | |
| Jul 2025 | 4 | 0 | 1 | 5 | Verified or annual reports | |
| Aug 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Sep 2025 | 6 | 0 | 2 | 8 | Verified or annual reports | |
| Oct 2025 | 7 | 0 | 3 | 10 | Verified or annual reports | |
| Nov 2025 | 0 | 0 | 0 | 0 | ||
| Dec 2025 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Jan 2026 | 0 | 0 | 0 | 0 | ||
| Feb 2026 | 0 | 0 | 0 | 0 | ||
| Mar 2026 | 2 | 0 | 2 | 4 | Verified or annual reports | |
| Apr 2026 | 0 | 0 | 0 | 0 | ||
| May 2026 | 0 | 0 | 0 | 0 | ||
| Jun 2026 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Jul 2026 | 9 | 0 | 4 | 13 | Verified or annual reports | |
| Aug 2026 | 1 | 0 | 0 | 1 | Verified or annual reports | |
| Sep 2026 | 4 | 0 | 2 | 6 | Verified or annual reports | |
| Oct 2026 | 2 | 0 | 4 | 6 | Public notices (no report yet) | |
| 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 2022-04. 4 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). MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Sources: EPA ECHO sewer overflow events; MassDEP sewage notification portal. Covered 2022-05-03 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 | Partly covered or sparse source |
| Jun 2022 | 0 | 0 | 720 | Partly covered or sparse source |
| Jul 2022 | 0 | 0 | 744 | |
| Aug 2022 | 49 | 49 | 744 | |
| Sep 2022 | 50 | 50 | 720 | |
| Oct 2022 | 63 | 63 | 744 | |
| Nov 2022 | 103 | 103 | 720 | |
| Dec 2022 | 215 | 215 | 744 | |
| Jan 2023 | 173 | 173 | 744 | |
| Feb 2023 | 0 | 0 | 672 | |
| Mar 2023 | 198 | 198 | 744 | |
| Apr 2023 | 23 | 23 | 720 | |
| May 2023 | 104 | 104 | 744 | |
| Jun 2023 | 242 | 242 | 720 | |
| Jul 2023 | 326 | 326 | 744 | |
| Aug 2023 | 305 | 305 | 744 | |
| Sep 2023 | 122 | 122 | 720 | |
| Oct 2023 | 50 | 50 | 744 | |
| Nov 2023 | 51 | 51 | 720 | |
| Dec 2023 | 197 | 197 | 744 | |
| Jan 2024 | 265 | 265 | 744 | |
| Feb 2024 | 0 | 0 | 696 | |
| Mar 2024 | 306 | 306 | 744 | |
| Apr 2024 | 158 | 158 | 720 | |
| May 2024 | 188 | 188 | 744 | |
| Jun 2024 | 167 | 167 | 720 | |
| Jul 2024 | 61 | 61 | 744 | |
| Aug 2024 | 135 | 135 | 744 | |
| Sep 2024 | 0 | 0 | 720 | |
| Oct 2024 | 0 | 0 | 744 | |
| Nov 2024 | 98 | 98 | 720 | |
| Dec 2024 | 102 | 102 | 744 | |
| Jan 2025 | 52 | 52 | 744 | |
| Feb 2025 | 54 | 54 | 672 | |
| Mar 2025 | 159 | 159 | 744 | |
| Apr 2025 | 147 | 147 | 720 | |
| May 2025 | 174 | 174 | 744 | |
| Jun 2025 | 51 | 51 | 720 | |
| Jul 2025 | 141 | 141 | 744 | |
| Aug 2025 | 92 | 92 | 744 | |
| Sep 2025 | 167 | 167 | 720 | |
| Oct 2025 | 228 | 228 | 744 | |
| Nov 2025 | 23 | 23 | 720 | |
| Dec 2025 | 51 | 51 | 744 | |
| Jan 2026 | 0 | 0 | 744 | |
| Feb 2026 | 0 | 0 | 672 | |
| Mar 2026 | 65 | 65 | 744 | |
| Apr 2026 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 744 | |
| Jun 2026 | 49 | 49 | 720 | |
| Jul 2026 | 237 | 237 | 744 | |
| Aug 2026 | 53 | 53 | 744 | |
| Sep 2026 | 124 | 124 | 720 | |
| Oct 2026 | 53 | 53 | 744 | |
| Nov 2026 | 0 | 0 | 32 |
Days with a discharge per month
A day counts when any counted discharge was under way on it (start to reported end, local time); an event with no end counts its start day.
- No source
- Partly covered or sparse source
No source covers 2022-01 to 2022-04.
Sources: EPA ECHO sewer overflow events; MassDEP sewage notification portal. Covered 2022-05-03 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 | Partly covered or sparse source |
| Jun 2022 | 0 | Partly covered or sparse source |
| Jul 2022 | 0 | |
| Aug 2022 | 1 | |
| Sep 2022 | 1 | |
| Oct 2022 | 2 | |
| Nov 2022 | 3 | |
| Dec 2022 | 3 | |
| Jan 2023 | 4 | |
| Feb 2023 | 0 | |
| Mar 2023 | 5 | |
| Apr 2023 | 1 | |
| May 2023 | 3 | |
| Jun 2023 | 5 | |
| Jul 2023 | 8 | |
| Aug 2023 | 6 | |
| Sep 2023 | 3 | |
| Oct 2023 | 1 | |
| Nov 2023 | 1 | |
| Dec 2023 | 4 | |
| Jan 2024 | 8 | |
| Feb 2024 | 0 | |
| Mar 2024 | 9 | |
| Apr 2024 | 5 | |
| May 2024 | 5 | |
| Jun 2024 | 4 | |
| Jul 2024 | 2 | |
| Aug 2024 | 2 | |
| Sep 2024 | 0 | |
| Oct 2024 | 0 | |
| Nov 2024 | 2 | |
| Dec 2024 | 3 | |
| Jan 2025 | 1 | |
| Feb 2025 | 1 | |
| Mar 2025 | 3 | |
| Apr 2025 | 3 | |
| May 2025 | 4 | |
| Jun 2025 | 1 | |
| Jul 2025 | 5 | |
| Aug 2025 | 1 | |
| Sep 2025 | 4 | |
| Oct 2025 | 5 | |
| Nov 2025 | 0 | |
| Dec 2025 | 1 | |
| Jan 2026 | 0 | |
| Feb 2026 | 0 | |
| Mar 2026 | 2 | |
| Apr 2026 | 0 | |
| May 2026 | 0 | |
| Jun 2026 | 1 | |
| Jul 2026 | 7 | |
| Aug 2026 | 1 | |
| Sep 2026 | 3 | |
| Oct 2026 | 2 | |
| Nov 2026 | 0 |
Reported volume per year
Gallons, summed from the 284 events that gave a number (4 did not).
- Partly covered or sparse source
4 of 288 events gave no volume as a number; only numbers are summed.
Sources: EPA ECHO sewer overflow events; MassDEP sewage notification portal. Covered 2022-05-03 to 2026-11-02.
Show table
| Year | Gallons | Events with a number | Events without | Coverage |
|---|---|---|---|---|
| 2022 | 123,880,000 | 21 | 0 | Partly covered or sparse source |
| 2023 | 1,896,409,002 | 100 | 0 | |
| 2024 | 2,270,532,541 | 84 | 0 | |
| 2025 | 528,950,000 | 52 | 0 | |
| 2026 | 251,190,000 | 27 | 4 |
Hours under advisory per year
Hours under advisory each year; 2026 to date.
- Advisory in effect
- Partly covered or sparse source
4 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; MassDEP sewage notification portal. Covered 2022-05-03 to 2026-11-02.
Show table
| Year | Hours under advisory | Share of the year | Coverage |
|---|---|---|---|
| 2022 | 479 | 5.5% | Partly covered or sparse source |
| 2023 | 1,790 | 20.4% | |
| 2024 | 1,479 | 16.8% | |
| 2025 | 1,340 | 15.3% | |
| 2026 | 582 | 7.9% |
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; MassDEP sewage notification portal. Covered 2022-05-03 to 2026-11-02.
Show table
| Month | Events | Years of records |
|---|---|---|
| Jan | 35 | 4 |
| Feb | 3 | 4 |
| Mar | 38 | 4 |
| Apr | 15 | 4 |
| May | 22 | 4 |
| Jun | 18 | 5 |
| Jul | 50 | 5 |
| Aug | 30 | 5 |
| Sep | 20 | 5 |
| Oct | 21 | 5 |
| Nov | 8 | 5 |
| Dec | 28 | 4 |
Discharge events by outfall
The 10 outfalls with the most events of 10, all years.
EPA ECHO sewer overflow records are sparse (only what permittees file with EPA). MassDEP portal records begin 2022-06-30. Verified Data Reports arrive after the month ends, so the latest months count public notices.
Sources: EPA ECHO sewer overflow events; MassDEP sewage notification portal. Covered 2022-05-03 to 2026-11-02.
Show table
| Outfall | Events |
|---|---|
| MWR205 EAST BNK MYSTIC 150 FT SW OF MDC LOCKS | 107 |
| T01 | 71 |
| MWR203 JUST NORTH OF LOCKS AT CHARLSTOWN BRIDGE | 46 |
| MWR201 125 FT WEST OF BU BRIDGE | 14 |
| MWR023 STORROW DRIVE @MUDDY RIVER | 9 |
| MWR020 715 SW OF HATCH MEMORIAL SHELL | 5 |
| MWR019 NORTH OF STORROW DR BTW EXETER & DARTMOUTH | 5 |
| MWR018 NORTH OF STORROW DR @ HEREFORD ST | 5 |
| MWR003 165 FT WEST OF ALEWIFE STATION ACCESS RD | 4 |
| MWR010 NORTH OF STORROW DR@MARY'S ST | 1 |
| Outfall not stated | 21 |
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)
- MassDEP sewage notification portal: 2022-06-30 to now