City of Holyoke (Water Pollution Control / DPW; Veolia contract operator)

CSO · Massachusetts · Holyoke

NPDES permit: MA0101630
Outfalls: 12 with coordinates in the registry (the state's layer lists 11)
Receiving waters: CONNECTICUT R.; DINGLE BK TO CONNECTICUT R.; HOLYOKE CANAL SYSTEM TO THE CONNECTICUT RIVER
Tracked waters: Connecticut River, MA
Events tracked: 1,763 discharges · latest Oct 16, 2026, 8:30 AM EDT
Volume reported: 1,166,258,793 gallons across the 1,490 discharges that give a volume (273 without one)

Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 1,763 event records below, as of 2026-11-02 11:56 UTC.

How it tells the public

Everbridge 'Emergency Notification System' incl. CSO notifications (sign-up member.everbridge.net/453003085611624/new; not subscribed). Until 2026-01-12 each email was copied to a holyoke.org page ('CSO Notification <date>'), readable as JSON via https://www.holyoke.org/wp-json/wp/v2/pages?search=CSO (72 matches, ~59 notices 2023-11 to 2026-01). Live CSO map by Flow Assessment Services (appservices.flowassessment.com/mapserver/cso_map.html?project=Holyoke; ArcGIS layer services6.arcgis.com/nOqGex1yAd2hthaE/.../Holyoke_MA/FeatureServer/0 returns '499 Token Required'); shows last activation start/end and 'Prelim' gallons per outfall with lat/lon. MassDEP portal PNs: none April-December 2025; resumed 2026 (Feb-Mar 2026 back-filed 2026-06-04); median 39 h from start in Jul-Oct 2026.

Outfall layer (source data)

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.

12 outfalls in the registry

002 PROVIDENCE HOSPITAL · CSO · Connecticut River
007 NORTHAMPTON ST/GLEN ST. · CSO · CONNECTICUT RIVER
008 SPRINGDALE PARK · CSO · CONNECTICUT RIVER
009 BERKSHIRE ST. · TCS · CONNECTICUT RIVER
011 JACKSON ST. · CSO · CONNECTICUT RIVER
016 FRONT ST./APPLETON ST. · CSO · CONNECTICUT RIVER · not on a tracked water
017 LYMAN ST · CSO · Connecticut River · not on a tracked water
018 WALNUT ST. · CSO · CONNECTICUT RIVER
019 YALE ST. · CSO · CONNECTICUT RIVER
020 CLEVELAND ST. · CSO · CONNECTICUT RIVER
021 RIVER TERRACE · CSO · CONNECTICUT RIVER
023 JEFFERSON ST. · CSO · CONNECTICUT RIVER · not on a tracked water

Source: EPA ECHO CSO outfall inventory matched to waters (data/outfalls-ne.json).

Event history

Events reported for City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), newest first
Start	End	Water	Outfall	Type	Volume	Source	Links
Oct 16, 2026, 8:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL09 BERKSHIRE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ea8906b2-6869-4463-a9e7-795e827e826e, published Oct 19, 2026, 8:30 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 16, 2026, 8:30 AM EDT · Map
Oct 16, 2026, 7:10 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1b0d9fb0-111b-49e6-9b23-ada7b2e17e48, published Oct 19, 2026, 8:29 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 16, 2026, 7:10 AM EDT · Map
Oct 16, 2026, 7:10 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a8bf4ded-7af5-426a-baf1-7cf5498393a5, published Oct 19, 2026, 8:26 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 16, 2026, 7:10 AM EDT · Map
Oct 11, 2026, 6:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 535d32d8-b4ab-4455-b504-0d5524a3eb65, published Oct 13, 2026, 8:10 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 6:15 PM EDT · Map
Oct 11, 2026, 5:55 PM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1137bebe-fc71-4d54-9d05-90189810481b, published Oct 13, 2026, 8:07 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 5:55 PM EDT · Map
Oct 11, 2026, 5:30 PM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 496ef276-19b0-4bdb-b8a9-0f8233f2875e, published Oct 13, 2026, 8:06 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 5:30 PM EDT · Map
Oct 11, 2026, 5:25 PM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e52ba69f-a879-4a7e-a109-f02ededa289f, published Oct 13, 2026, 8:02 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 5:25 PM EDT · Map
Oct 11, 2026, 5:10 PM EDT	ended, time not reported	Connecticut River, MA	HOL09 BERKSHIRE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8d89acb8-13f5-4fed-bbc3-fc56210e9fc1, published Oct 13, 2026, 8:08 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 5:10 PM EDT · Map
Oct 11, 2026, 5:10 PM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 32f0efb2-7544-4294-a22b-08f2b8bc4dd7, published Oct 13, 2026, 8:05 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 5:10 PM EDT · Map
Oct 11, 2026, 4:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e7261ecc-4444-4012-9247-3c9d3648e918, published Oct 13, 2026, 8:00 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 4:15 PM EDT · Map
Oct 11, 2026, 4:00 PM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ed874325-e121-47d0-8451-8691c015150c, published Oct 13, 2026, 7:59 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 4:00 PM EDT · Map
Oct 11, 2026, 4:00 PM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 019581de-002c-418d-aa55-ee4de53f3d36, published Oct 13, 2026, 7:57 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Oct 11, 2026, 4:00 PM EDT · Map
Sep 28, 2026, 2:55 PM EDT	ended, time not reported	Connecticut River, MA	HOL09 BERKSHIRE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f8d322db-5cd5-4299-9da5-ed8048dd462a, published Oct 1, 2026, 10:14 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 28, 2026, 2:55 PM EDT · Map
Sep 28, 2026, 1:55 PM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7fc71b3d-5af3-443e-88bf-536c0f685e67, published Oct 1, 2026, 10:12 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 28, 2026, 1:55 PM EDT · Map
Sep 28, 2026, 1:05 PM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7f50aace-34c0-49f9-a8a5-fd9a7a227933, published Oct 1, 2026, 10:16 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 28, 2026, 1:05 PM EDT · Map
Sep 27, 2026, 3:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 32bb6dba-4429-4ea2-abf9-c9d396764285, published Oct 1, 2026, 10:09 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 27, 2026, 3:20 PM EDT · Map
Sep 27, 2026, 1:55 PM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b18c0d39-cd71-4a5f-add0-00571bca6e80, published Oct 1, 2026, 10:07 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 27, 2026, 1:55 PM EDT · Map
Sep 13, 2026, 1:00 PM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d1d60279-1cf0-4809-bc6b-ec248f6537cf, published Sep 14, 2026, 10:57 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 13, 2026, 1:00 PM EDT · Map
Sep 13, 2026, 9:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7d0421fc-7e61-4364-9c6f-8f96b2a336cf, published Sep 14, 2026, 10:59 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 9:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 83c2b7f9-da32-467b-bb55-b6ef10fda1f6, published Sep 14, 2026, 10:50 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 8:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 30a0f1f5-5e2b-43c8-9d90-a59d78ddb0c5, published Sep 14, 2026, 10:58 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 13, 2026, 8:45 AM EDT · Map
Sep 13, 2026, 8:40 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8f484c89-60c8-4f25-a27f-1826c4725ad1, published Sep 14, 2026, 10:56 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 13, 2026, 8:40 AM EDT · Map
Sep 5, 2026, 9:05 PM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2d6c9b55-e3a2-4a52-a408-1ee039189866, published Sep 8, 2026, 8:41 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 5, 2026, 9:05 PM EDT · Map
Sep 1, 2026, 11:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL016 FRONT ST./APPLETON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5db322f4-2ef7-48af-8644-f6500b86a672, published Sep 2, 2026, 11:52 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 11:30 AM EDT · Map
Sep 1, 2026, 7:00 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a97c4fc9-1772-448c-93b0-fcdd6d95353f, published Sep 2, 2026, 11:36 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 7:00 AM EDT · Map
Sep 1, 2026, 6:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 96471caa-89a5-4df0-92ad-f53720c30d44, published Sep 2, 2026, 11:37 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:25 AM EDT · Map
Sep 1, 2026, 6:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7bfc68f8-0c58-479d-acb4-d641edd3c6e3, published Sep 2, 2026, 11:32 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:25 AM EDT · Map
Sep 1, 2026, 6:20 AM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b40b9779-53dc-44bc-9999-8285e55a6c23, published Sep 2, 2026, 11:35 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:20 AM EDT · Map
Sep 1, 2026, 6:20 AM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record eeb64010-6732-4b5b-8148-8b444f73e0cc, published Sep 2, 2026, 11:34 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:20 AM EDT · Map
Sep 1, 2026, 6:20 AM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0619e9e6-d094-47ee-9245-73154dbab8fc, published Sep 2, 2026, 11:33 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:20 AM EDT · Map
Sep 1, 2026, 6:15 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4487ba3f-97b6-4290-9a71-5a2d4cd923d8, published Sep 2, 2026, 11:38 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:15 AM EDT · Map
Sep 1, 2026, 6:15 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 376c5d2e-81d7-4067-b45b-adfd14fa3c0c, published Sep 2, 2026, 11:35 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Sep 1, 2026, 6:15 AM EDT · Map
August 2026	September 2026	Connecticut River, MA	023 JEFFERSON ST.	Combined sewer overflow	42,623 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:023:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	021 RIVER TERRACE	Combined sewer overflow	357,680 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:021:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	020 CLEVELAND ST.	Combined sewer overflow	556,160 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:020:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	019 YALE ST.	Combined sewer overflow	7,086 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:019:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	018 WALNUT ST.	Combined sewer overflow	1.24 million gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:018:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	016 FRONT ST./APPLETON ST.	Combined sewer overflow	7,778 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:016:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	008 SPRINGDALE PARK	Combined sewer overflow	399,566 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:008:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	007 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	7,416 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:007:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
August 2026	September 2026	Connecticut River, MA	002 PROVIDENCE HOSPITAL	Combined sewer overflow	8,950 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:002:2026-09, reported Oct 14, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), August 2026 · Map
Aug 3, 2026, 12:55 AM EDT	ended, time not reported	Connecticut River, MA	HOL09 BERKSHIRE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 024628a3-d9dd-4b25-a129-649377f411f5, published Aug 4, 2026, 12:07 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:55 AM EDT · Map
Aug 3, 2026, 12:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3b3a8601-66f4-47b4-b0f7-ef25acf4cdb2, published Aug 4, 2026, 12:19 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:30 AM EDT · Map
Aug 3, 2026, 12:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4f1c94e6-d0c9-4e7a-a84b-86b8f50e12d4, published Aug 4, 2026, 12:19 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:30 AM EDT · Map
Aug 3, 2026, 12:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 28e4e228-053c-4bb8-8035-b38af9821689, published Aug 4, 2026, 12:17 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:30 AM EDT · Map
Aug 3, 2026, 12:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0313a07b-815a-479d-93e2-a97ef20cfb82, published Aug 4, 2026, 12:18 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:25 AM EDT · Map
Aug 3, 2026, 12:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e975445c-8858-4e2e-8d99-b8c1c1b30c5a, published Aug 4, 2026, 12:10 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:25 AM EDT · Map
Aug 3, 2026, 12:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL016 FRONT ST./APPLETON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c511b052-171f-43eb-bc72-f9defe0ed5c4, published Aug 4, 2026, 12:09 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:25 AM EDT · Map
Aug 3, 2026, 12:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4f918c1c-b1c7-4497-bd1e-e1c7b93ffddb, published Aug 4, 2026, 12:07 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:25 AM EDT · Map
Aug 3, 2026, 12:25 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 12db7138-c24b-4cf5-8433-d0245d3ec487, published Aug 4, 2026, 12:02 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:25 AM EDT · Map
Aug 3, 2026, 12:20 AM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 71b4bba0-5abb-4744-97dc-4cfd8d77db33, published Aug 4, 2026, 12:06 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Aug 3, 2026, 12:20 AM EDT · Map
July 2026	August 2026	Connecticut River, MA	023 JEFFERSON ST.	Combined sewer overflow	98,372 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:023:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	021 RIVER TERRACE	Combined sewer overflow	858,678 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:021:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	020 CLEVELAND ST.	Combined sewer overflow	437,385 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:020:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	019 YALE ST.	Combined sewer overflow	13,391 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:019:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	018 WALNUT ST.	Combined sewer overflow	3.01 million gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:018:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	016 FRONT ST./APPLETON ST.	Combined sewer overflow	175,413 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:016:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	009 BERKSHIRE ST.	Combined sewer overflow	“1 discharge event(s)”	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:009:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	008 SPRINGDALE PARK	Combined sewer overflow	1.25 million gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:008:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	007 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	32,228 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:007:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
July 2026	August 2026	Connecticut River, MA	002 PROVIDENCE HOSPITAL	Combined sewer overflow	44,527 gal	EPA ECHO Discharge Monitoring Reports (permittee-reported monthly CSO figures) via ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall), record MA0101630:002:2026-08, reported Sep 13, 2026, 8:00 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, City of Holyoke (Water Pollution Control / DPW; Veolia contract operator), July 2026 · Map
Jul 31, 2026, 11:55 AM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2ad0ff01-ef8f-4e05-8542-21d71d2ab180, published Aug 3, 2026, 10:18 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:55 AM EDT · Map
Jul 31, 2026, 11:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 669c1b18-c4bc-481e-9cf7-21d7bea920ab, published Aug 3, 2026, 10:17 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:45 AM EDT · Map
Jul 31, 2026, 11:35 AM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 254c4920-7b7c-4c65-84e6-4c246f5b4c2a, published Aug 3, 2026, 9:48 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:35 AM EDT · Map
Jul 31, 2026, 11:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d29fb0b9-175d-4790-81b0-9a964336bf31, published Aug 3, 2026, 10:18 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:30 AM EDT · Map
Jul 31, 2026, 11:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 96dfff0f-97fe-41f2-bd20-f855434d49c3, published Aug 3, 2026, 10:16 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:30 AM EDT · Map
Jul 31, 2026, 11:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record fcb638c6-4a61-4fad-8383-dbd80f52b59b, published Aug 3, 2026, 10:15 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:30 AM EDT · Map
Jul 31, 2026, 11:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ee31e83a-560c-404e-80ac-03f32b701910, published Aug 3, 2026, 9:49 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 31, 2026, 11:30 AM EDT · Map
Jul 30, 2026, 7:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a3412508-8494-4306-b886-eaef260de8fb, published Aug 3, 2026, 9:48 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 30, 2026, 7:30 AM EDT · Map
Jul 30, 2026, 3:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 214e56b8-38c4-45fc-94f0-d94f24b8260e, published Jul 31, 2026, 10:51 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 30, 2026, 3:50 AM EDT · Map
Jul 30, 2026, 3:30 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8fde52a1-4567-4c67-9ebb-299647e8ab84, published Jul 31, 2026, 10:52 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 30, 2026, 3:30 AM EDT · Map
Jul 30, 2026, 2:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e8d70b30-abd3-418d-a44a-f81d1f98bc02, published Jul 31, 2026, 10:53 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 30, 2026, 2:50 AM EDT · Map
Jul 29, 2026, 11:05 PM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2c55b27f-6c1d-4a21-8f24-ca3bafc726ee, published Jul 30, 2026, 2:05 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 11:05 PM EDT · Map
Jul 29, 2026, 2:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL016 FRONT ST./APPLETON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 01676caf-63a4-4e77-a6d6-a3efb588869a, published Jul 30, 2026, 2:10 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 2:20 PM EDT · Map
Jul 29, 2026, 2:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f5eefeea-de6e-4799-b0c7-2492c88f1fc0, published Jul 30, 2026, 2:09 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 2:15 PM EDT · Map
Jul 29, 2026, 2:05 PM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1a641fa4-1060-4b8c-b0f2-8a60a3ffb9b0, published Jul 30, 2026, 2:09 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 2:05 PM EDT · Map
Jul 29, 2026, 11:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5b6306a2-d0a6-4dd0-8128-6547394bec48, published Jul 30, 2026, 2:08 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 11:50 AM EDT · Map
Jul 29, 2026, 11:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b8f121dd-2af5-442a-b1a2-cf4a242dbc39, published Jul 30, 2026, 2:07 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 29, 2026, 11:50 AM EDT · Map
Jul 28, 2026, 11:55 AM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8b37fd60-6a97-46ce-95ee-7b9b89fefdfc, published Jul 31, 2026, 9:52 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:55 AM EDT · Map
Jul 28, 2026, 11:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b4fbe545-ea79-4416-9112-da48a2956e33, published Jul 31, 2026, 9:55 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:50 AM EDT · Map
Jul 28, 2026, 11:50 AM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8d02fccf-b96f-41f9-80d1-4b15d69a5760, published Jul 31, 2026, 9:54 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:50 AM EDT · Map
Jul 28, 2026, 11:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL016 FRONT ST./APPLETON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record fb1f0d04-10b8-4c2c-a953-e671b5cdc011, published Jul 31, 2026, 9:56 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:45 AM EDT · Map
Jul 28, 2026, 11:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2cde58e5-6a7c-4017-a285-aec60d269b8c, published Jul 31, 2026, 9:54 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:45 AM EDT · Map
Jul 28, 2026, 11:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 90ead001-b33d-4073-bb4b-71d62c6cedd1, published Jul 31, 2026, 9:53 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:45 AM EDT · Map
Jul 28, 2026, 11:45 AM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 081a3321-c80c-444e-9a9d-7dd40ec64f1e, published Jul 31, 2026, 9:52 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 28, 2026, 11:45 AM EDT · Map
Jul 22, 2026, 5:05 PM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e94c913e-bb08-426d-86df-0b3ca38f129a, published Jul 28, 2026, 2:38 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 5:05 PM EDT · Map
Jul 22, 2026, 5:00 PM EDT	ended, time not reported	Connecticut River, MA	HOL016 FRONT ST./APPLETON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7756b79d-27b6-46af-b510-65b30d74d4ed, published Jul 28, 2026, 2:38 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 5:00 PM EDT · Map
Jul 22, 2026, 1:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL09 BERKSHIRE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 52601ddd-ecb9-48db-9a34-f269949c7252, published Jul 28, 2026, 2:30 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 1:15 PM EDT · Map
Jul 22, 2026, 12:50 PM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 69072397-c2dd-4704-9488-144a951874ac, published Jul 28, 2026, 2:40 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 12:50 PM EDT · Map
Jul 22, 2026, 12:50 PM EDT	ended, time not reported	Connecticut River, MA	HOL018 WALNUT ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 92f5eafc-e21e-4cd9-8905-dd29907eda57, published Jul 28, 2026, 2:39 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 12:50 PM EDT · Map
Jul 22, 2026, 12:50 PM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1c89e289-32a4-4577-9239-1fe5ad3979d6, published Jul 28, 2026, 2:34 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 12:50 PM EDT · Map
Jul 22, 2026, 12:50 PM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 313863a4-baf6-45ab-8a32-3fabfcf1a41f, published Jul 28, 2026, 2:32 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 12:50 PM EDT · Map
Jul 22, 2026, 12:50 PM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4b0088e4-3331-43d8-b6f7-f11ec27cb687, published Jul 28, 2026, 2:29 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 22, 2026, 12:50 PM EDT · Map
Jul 18, 2026, 1:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL08 SPRINGDALE PARK	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 884a90b7-2a3e-4b95-a75f-00270690ba6e, published Jul 29, 2026, 2:57 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:20 PM EDT · Map
Jul 18, 2026, 1:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL021 RIVER TERRACE	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2d4b914d-eb7c-4ed5-84e5-5cac6e5aa2ca, published Jul 29, 2026, 2:56 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:20 PM EDT · Map
Jul 18, 2026, 1:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL02 PROVIDENCE HOSPITAL	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record db3bde11-ce76-4b1c-bd61-1d0b2dfcaccb, published Jul 29, 2026, 2:56 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:20 PM EDT · Map
Jul 18, 2026, 1:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL019 YALE ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a00d05e6-4586-48be-87d5-13fb6d8bb253, published Jul 29, 2026, 2:54 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:20 PM EDT · Map
Jul 18, 2026, 1:20 PM EDT	ended, time not reported	Connecticut River, MA	HOL023 JEFFERSON ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a26a94e6-8dae-45c9-94a3-d704a640dcbc, published Jul 29, 2026, 2:53 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:20 PM EDT · Map
Jul 18, 2026, 1:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL020 CLEVELAND ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 15d07c0c-cf1b-4f36-a29d-7719370fad93, published Jul 29, 2026, 2:57 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:15 PM EDT · Map
Jul 18, 2026, 1:15 PM EDT	ended, time not reported	Connecticut River, MA	HOL07 NORTHAMPTON ST/GLEN ST.	Combined sewer overflow	not reported	CITY OF HOLYOKE (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record d1897e8a-a601-429d-897d-846651df4296, published Jul 29, 2026, 2:54 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HOLYOKE, Jul 18, 2026, 1:15 PM EDT · Map

Showing the newest 100 events of 1,914 events. See them all with filters.

History

Discharge events, last 12 months185Dec 2025 to Nov 2026
Days with a discharge, last 12 months71Dec 2025 to Nov 2026
Hours under advisory, last 12 months1,284Dec 2025 to Nov 2026; on this discharger's reports
2026 season under advisory8.8%May to October; 388 h

Discharge events per month

1,409 events, Jan 2022 to Nov 2026. Counted from 1,253 verified or annual reports, 156 public notices.

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. Some dischargers here report only monthly or yearly totals; those are shown under reported totals, not counted here.

Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.

Show table

Discharge events per month
Month	Combined sewer overflow	Sanitary sewer overflow	Total	Counted from	Coverage
Jan 2022	0	0	0		No source
Feb 2022	0	0	0		No source
Mar 2022	0	0	0		No source
Apr 2022	0	0	0		No source
May 2022	0	0	0		No source
Jun 2022	0	0	0		Partly covered or sparse source
Jul 2022	48	0	48	Verified or annual reports
Aug 2022	36	0	36	Verified or annual reports
Sep 2022	47	0	47	Verified or annual reports
Oct 2022	22	0	22	Verified or annual reports
Nov 2022	33	0	33	Verified or annual reports
Dec 2022	25	0	25	Verified or annual reports
Jan 2023	37	0	37	Verified or annual reports
Feb 2023	5	0	5	Verified or annual reports
Mar 2023	16	0	16	Verified or annual reports
Apr 2023	26	0	26	Verified or annual reports
May 2023	21	0	21	Verified or annual reports
Jun 2023	37	0	37	Verified or annual reports
Jul 2023	109	0	109	Verified or annual reports
Aug 2023	32	0	32	Verified or annual reports
Sep 2023	59	0	59	Verified or annual reports
Oct 2023	10	0	10	Verified or annual reports
Nov 2023	13	0	13	Verified or annual reports
Dec 2023	39	0	39	Verified or annual reports
Jan 2024	29	0	29	Verified or annual reports
Feb 2024	11	0	11	Verified or annual reports
Mar 2024	34	0	34	Verified or annual reports
Apr 2024	21	0	21	Verified or annual reports
May 2024	41	0	41	Verified or annual reports
Jun 2024	59	0	59	Verified or annual reports
Jul 2024	50	0	50	Verified or annual reports
Aug 2024	34	0	34	Verified or annual reports
Sep 2024	11	0	11	Verified or annual reports
Oct 2024	0	0	0
Nov 2024	11	0	11	Verified or annual reports
Dec 2024	28	0	28	Verified or annual reports
Jan 2025	10	0	10	Verified or annual reports
Feb 2025	7	0	7	Verified or annual reports
Mar 2025	27	0	27	Verified or annual reports
Apr 2025	0	0	0
May 2025	66	0	66	Verified or annual reports
Jun 2025	29	0	29	Verified or annual reports
Jul 2025	64	0	64	Verified or annual reports
Aug 2025	9	0	9	Verified or annual reports
Sep 2025	29	0	29	Verified or annual reports
Oct 2025	28	0	28	Verified or annual reports
Nov 2025	11	0	11	Verified or annual reports
Dec 2025	9	0	9	Verified or annual reports
Jan 2026	2	0	2	Public notices (no report yet)
Feb 2026	2	0	2	Public notices (no report yet)
Mar 2026	1	1	2	Verified or annual reports
Apr 2026	21	0	21	Public notices (no report yet)
May 2026	18	0	18	Verified or annual reports
Jun 2026	40	0	40	Public notices (no report yet)
Jul 2026	49	0	49	Public notices (no report yet)
Aug 2026	10	0	10	Public notices (no report yet)
Sep 2026	20	0	20	Public notices (no report yet)
Oct 2026	12	0	12	Public notices (no report yet)
Nov 2026	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. 155 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. 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

Hours under advisory per month
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	293	293	744
Aug 2022	229	229	744
Sep 2022	286	286	720
Oct 2022	225	225	744
Nov 2022	277	277	720
Dec 2022	300	300	744
Jan 2023	499	499	744
Feb 2023	142	142	672
Mar 2023	406	406	744
Apr 2023	203	203	720
May 2023	193	193	744
Jun 2023	320	320	720
Jul 2023	555	555	744
Aug 2023	300	300	744
Sep 2023	324	324	720
Oct 2023	195	195	744
Nov 2023	220	220	720
Dec 2023	334	334	744
Jan 2024	358	358	744
Feb 2024	51	51	696
Mar 2024	513	513	744
Apr 2024	377	377	720
May 2024	275	275	744
Jun 2024	350	350	720
Jul 2024	396	396	744
Aug 2024	302	302	744
Sep 2024	99	99	720
Oct 2024	0	0	744
Nov 2024	197	197	720
Dec 2024	241	241	744
Jan 2025	59	59	744
Feb 2025	210	210	672
Mar 2025	255	255	744
Apr 2025	48	48	720
May 2025	514	514	744
Jun 2025	222	222	720
Jul 2025	417	417	744
Aug 2025	105	105	744
Sep 2025	182	182	720
Oct 2025	291	291	744
Nov 2025	258	258	720
Dec 2025	113	113	744
Jan 2026	0	0	744
Feb 2026	0	0	672
Mar 2026	567	567	744
Apr 2026	216	216	720
May 2026	339	339	744
Jun 2026	49	49	720
Jul 2026	0	0	744
Aug 2026	0	0	744
Sep 2026	0	0	720
Oct 2026	0	0	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

Days with a discharge per month
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	8
Aug 2022	5
Sep 2022	6
Oct 2022	6
Nov 2022	9
Dec 2022	7
Jan 2023	18
Feb 2023	2
Mar 2023	11
Apr 2023	6
May 2023	4
Jun 2023	7
Jul 2023	15
Aug 2023	6
Sep 2023	11
Oct 2023	4
Nov 2023	4
Dec 2023	11
Jan 2024	12
Feb 2024	2
Mar 2024	16
Apr 2024	10
May 2024	6
Jun 2024	10
Jul 2024	9
Aug 2024	7
Sep 2024	2
Oct 2024	0
Nov 2024	5
Dec 2024	6
Jan 2025	2
Feb 2025	4
Mar 2025	7
Apr 2025	0
May 2025	19
Jun 2025	5
Jul 2025	12
Aug 2025	2
Sep 2025	5
Oct 2025	8
Nov 2025	7
Dec 2025	2
Jan 2026	1
Feb 2026	2
Mar 2026	24
Apr 2026	7
May 2026	10
Jun 2026	8
Jul 2026	9
Aug 2026	1
Sep 2026	5
Oct 2026	2
Nov 2026	0

Reported volume per year

Gallons, summed from the 1,253 events that gave a number (156 did not).

Partly covered or sparse source

156 of 1,409 events gave no volume as a number; only numbers are summed.

Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.

Show table

Reported volume per year
Year	Gallons	Events with a number	Events without	Coverage
2022	124,116,388	211	0	Partly covered or sparse source
2023	349,448,648	404	0
2024	204,550,222	329	0
2025	254,641,238	289	0
2026	18,385,772	20	156

Hours under advisory per year

Hours under advisory each year; 2026 to date.

Advisory in effect
Partly covered or sparse source

155 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.

Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.

Show table

Hours under advisory per year
Year	Hours under advisory	Share of the year	Coverage
2022	1,610	18.4%	Partly covered or sparse source
2023	3,690	42.1%
2024	3,156	35.9%
2025	2,675	30.5%
2026	1,172	16.0%

Share of the May to October season under advisory

Share of the hours from May 1 to October 31 with an advisory in effect.

Advisory in effect
Season partly covered

Seasons only partly covered by a source: 2022 (share is of the covered hours). 155 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.

Source: MassDEP sewage notification portal. Covered 2022-06-30 to 2026-11-02.

Show table

Share of the May to October season under advisory
Season	Share under advisory	Hours under advisory	Hours covered	Season hours	Partly covered
2022	34.9%	1,033	2,958	4,416	yes
2023	42.7%	1,886	4,416	4,416
2024	32.2%	1,421	4,416	4,416
2025	39.2%	1,732	4,416	4,416
2026	8.8%	388	4,416	4,416

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

Discharge events by calendar month, all years
Month	Events	Years of records
Jan	78	4
Feb	25	4
Mar	79	4
Apr	68	4
May	146	4
Jun	165	5
Jul	320	5
Aug	121	5
Sep	166	5
Oct	72	5
Nov	68	5
Dec	101	4

Discharge events by outfall

The 10 outfalls with the most events of 10, 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

Discharge events by outfall
Outfall	Events
HOL018 WALNUT ST.	246
HOL020 CLEVELAND ST.	212
HOL021 RIVER TERRACE	188
HOL08 SPRINGDALE PARK	168
HOL09 BERKSHIRE ST.	121
HOL023 JEFFERSON ST.	117
HOL02 PROVIDENCE HOSPITAL	105
HOL019 YALE ST.	103
HOL07 NORTHAMPTON ST/GLEN ST.	95
HOL016 FRONT ST./APPLETON ST.	53
Outfall not stated	1

Reported monthly totals: EPA ECHO discharge monitoring reports (monthly CSO totals)

Monthly totals each permittee files with EPA per outfall (discharge monitoring reports). They describe the same discharges the state notices report, so they are shown here and never added to the event counts. A month with no row counts as zero inside the span. Source: EPA ECHO discharge monitoring reports (monthly CSO totals). Covered 2024-01-01 to 2026-09-30.

Reported volume

Gallons per month.

Show table

Reported volume
Month	Reported volume
Jan 2024	21,701,382 gal
Feb 2024	296,492 gal
Mar 2024	25,910,034 gal
Apr 2024	5,729,401 gal
May 2024	8,845,826 gal
Jun 2024	18,552,246 gal
Jul 2024	5,548,607 gal
Aug 2024	2,956,033 gal
Sep 2024	241,078 gal
Oct 2024	23,494 gal
Nov 2024	2,205,060 gal
Dec 2024	4,939,120 gal
Jan 2025	2,060,954 gal
Feb 2025	1,114,238 gal
Mar 2025	10,390,092 gal
Apr 2025	2,066,419 gal
May 2025	20,389,027 gal
Jun 2025	3,379,758 gal
Jul 2025	10,766,776 gal
Aug 2025	6,334,723 gal
Sep 2025	7,540,281 gal
Oct 2025	8,630,938 gal
Nov 2025	1,892,514 gal
Dec 2025	3,178,481 gal
Jan 2026	320,838 gal
Feb 2026	26,778 gal
Mar 2026	12,151,133 gal
Apr 2026	1,417,588 gal
May 2026	2,538,313 gal
Jun 2026	4,553,500 gal
Jul 2026	10,869,647 gal
Aug 2026	5,922,611 gal
Sep 2026	2,623,143 gal

Discharge events reported

Events per month.

Show table

Discharge events reported
Month	Discharge events reported
Jan 2024	36
Feb 2024	13
Mar 2024	53
Apr 2024	32
May 2024	47
Jun 2024	70
Jul 2024	59
Aug 2024	49
Sep 2024	13
Oct 2024	1
Nov 2024	14
Dec 2024	32
Jan 2025	13
Feb 2025	10
Mar 2025	33
Apr 2025	40
May 2025	76
Jun 2025	33
Jul 2025	75
Aug 2025	10
Sep 2025	34
Oct 2025	33
Nov 2025	14
Dec 2025	12
Jan 2026	2
Feb 2026	2
Mar 2026	29
Apr 2026	25
May 2026	22
Jun 2026	42
Jul 2026	70
Aug 2026	15
Sep 2026	19

Hours of discharge reported

Hours per month.

Show table

Hours of discharge reported
Month	Hours of discharge reported
Jan 2024	410 h
Feb 2024	52 h
Mar 2024	583 h
Apr 2024	271 h
May 2024	150 h
Jun 2024	201 h
Jul 2024	125 h
Aug 2024	89 h
Sep 2024	8 h
Oct 2024	0 h
Nov 2024	55 h
Dec 2024	114 h
Jan 2025	27 h
Feb 2025	27 h
Mar 2025	133 h
Apr 2025	72 h
May 2025	735 h
Jun 2025	43 h
Jul 2025	137 h
Aug 2025	34 h
Sep 2025	164 h
Oct 2025	157 h
Nov 2025	51 h
Dec 2025	38 h
Jan 2026	14 h
Feb 2026	3 h
Mar 2026	680 h
Apr 2026	98 h
May 2026	101 h
Jun 2026	153 h
Jul 2026	289 h
Aug 2026	126 h
Sep 2026	70 h

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

Month	Events	Years of records
Jan	78	4
Feb	25	4
Mar	79	4
Apr	68	4
May	146	4
Jun	165	5
Jul	320	5
Aug	121	5
Sep	166	5
Oct	72	5
Nov	68	5
Dec	101	4

Month	Events	Years of records
Jan	78	4
Feb	25	4
Mar	79	4
Apr	68	4
May	146	4
Jun	165	5
Jul	320	5
Aug	121	5
Sep	166	5
Oct	72	5
Nov	68	5
Dec	101	4

Month	Events	Years of records
Jan	78	4
Feb	25	4
Mar	79	4
Apr	68	4
May	146	4
Jun	165	5
Jul	320	5
Aug	121	5
Sep	166	5
Oct	72	5
Nov	68	5
Dec	101	4