City of Haverhill Wastewater Department

CSO · Massachusetts · Haverhill, Groveland

NPDES permit: MA0101621
Outfalls: 13 with coordinates in the registry
Receiving waters: LITTLE RIVER; MERRIMACK RIVER
Tracked waters: Merrimack River, MA
Events tracked: 509 discharges · latest Oct 16, 2026, 6:35 PM EDT
Volume reported: 215,979,658 gallons across the 488 discharges that give a volume (21 without one)

Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 509 event records below, as of 2026-11-02 11:56 UTC.

How it tells the public

Haverhill CSO public notification page with real-time map https://www.haverhillma.gov/living-here/waterwastewater-services/wastewater/wastewater-collection-system/cso-public-notification/ (per MRWC page); email sign-up by writing to the city contact named there; one email per event linking to a map with start, end and volume (MRWC). Aquasight app also lists Haverhill. MassDEP portal: 984 rows.

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.

13 outfalls in the registry

013 LOWER SIPHON BUTTONWOOD AVE · CSO · Merrimack River
019 MAIN STREET NORTH · CSO · Merrimack River
021A MIDDLE SIPHON ESSEX ST · CSO · Merrimack River
021B Emerson Street · CSO · Little River
021F LOCKE STREET CENTER BARRELL · CSO · Little River · not on a tracked water
021H WINTER AND HALE · CSO · Little River · not on a tracked water
024 VARNUM ST UPPER SIPHON · CSO · Merrimack River
032 BRADFORD AVE · CSO · Merrimack River
034 MIDDLESEX STREET · CSO · Merrimack River
038 HIGH AND LAFAYETTE SQ · CSO · Little River · not on a tracked water
039 SOUTH WEBSTER · CSO · Merrimack River
040 BETHANY AVE · CSO · Merrimack River
041 CHESTNUT ST · CSO · Merrimack River

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

Event history

Events reported for City of Haverhill Wastewater Department, newest first
Start	End	Water	Outfall	Type	Volume	Source	Links
Oct 16, 2026, 6:35 PM EDT	ended, time not reported	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 46f79e59-9281-469f-95d6-cb85affb2e7b, published Oct 19, 2026, 7:18 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Oct 16, 2026, 6:35 PM EDT · Map
Oct 11, 2026, 10:55 PM EDT	ended, time not reported	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9889fa84-3ee5-483b-88f6-622b1463807f, published Oct 13, 2026, 7:14 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Oct 11, 2026, 10:55 PM EDT · Map
Oct 11, 2026, 10:05 PM EDT	ended, time not reported	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7951c12a-aaf9-4f09-ac8f-66bf70dea302, published Oct 13, 2026, 7:13 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Oct 11, 2026, 10:05 PM EDT · Map
Oct 11, 2026, 8:45 PM EDT	ended, time not reported	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1bbad740-a773-4575-905a-d784c483df4f, published Oct 13, 2026, 7:12 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Oct 11, 2026, 8:45 PM EDT · Map
Sep 27, 2026, 2:05 PM EDT	Sep 27, 2026, 9:35 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflow	299,128 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5a219e13-27a0-42ca-9575-6041f5f019df, published Oct 15, 2026, 11:58 PM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 27, 2026, 2:05 PM EDT · Map
Sep 27, 2026, 2:05 PM EDT	Sep 27, 2026, 9:35 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5294cae2-a015-4e51-8140-e46860f632c4, published Sep 28, 2026, 10:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 27, 2026, 2:05 PM EDT · Map
Sep 27, 2026, 1:15 AM EDT	Sep 27, 2026, 1:20 AM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	8,183 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3f899554-e97a-4568-9b61-f174d6f6d586, published Oct 16, 2026, 12:00 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 27, 2026, 1:15 AM EDT · Map
Sep 27, 2026, 1:15 AM EDT	Sep 27, 2026, 1:20 AM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a34043b9-ecba-4cc4-b598-49a1b80d35a5, published Sep 28, 2026, 6:56 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 27, 2026, 1:15 AM EDT · Map
Sep 13, 2026, 1:35 PM EDT	Sep 13, 2026, 2:15 PM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflow	118,348 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b8ac5444-ce32-42d1-a2ca-99941c572739, published Oct 16, 2026, 12:03 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 1:35 PM EDT · Map
Sep 13, 2026, 1:35 PM EDT	Sep 13, 2026, 2:15 PM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 740e28f2-06e8-4c63-9918-f92873852e42, published Sep 14, 2026, 1:29 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 1:35 PM EDT · Map
Sep 13, 2026, 12:15 PM EDT	Sep 13, 2026, 1:15 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflow	82,100 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ce7974c0-ba38-4edd-8413-e557e7bc32c6, published Oct 16, 2026, 12:18 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 12:15 PM EDT · Map
Sep 13, 2026, 12:15 PM EDT	Sep 13, 2026, 1:15 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 771e006b-0394-4c62-b819-b4ba842fb6e8, published Sep 14, 2026, 1:26 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 12:15 PM EDT · Map
Sep 13, 2026, 9:50 AM EDT	Sep 13, 2026, 1:05 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	124,922 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 55eba55f-8346-4118-863c-acaa587bbe71, published Oct 16, 2026, 12:22 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:50 AM EDT · Map
Sep 13, 2026, 9:50 AM EDT	Sep 13, 2026, 1:05 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8de19f26-b2ec-4f1b-a2c0-868955916221, published Sep 14, 2026, 12:38 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:50 AM EDT · Map
Sep 13, 2026, 9:45 AM EDT	Sep 13, 2026, 2:05 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	305,358 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2564c89c-9a23-498b-bd46-0a6907d276a5, published Oct 16, 2026, 12:25 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 9:45 AM EDT	Sep 13, 2026, 9:45 AM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	0 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 83052c1f-b9c8-48d7-b68e-cc6751f48eee, published Oct 16, 2026, 12:20 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 9:45 AM EDT	Sep 13, 2026, 2:05 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3f87d195-d85f-4c7a-8f68-885875dc5ed7, published Sep 14, 2026, 12:38 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 9:45 AM EDT	Sep 13, 2026, 2:05 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 29adbf22-b599-4078-a240-2859663a82a7, published Sep 14, 2026, 12:36 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:45 AM EDT · Map
Sep 13, 2026, 9:30 AM EDT	Sep 13, 2026, 12:05 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	52,788 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 56af69ca-b84d-40f1-ba69-32b4c14e852a, published Oct 16, 2026, 12:23 AM EDT, retrieved 2026-11-02 11:54 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:30 AM EDT · Map
Sep 13, 2026, 9:30 AM EDT	Sep 13, 2026, 12:05 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a5895477-6323-4784-bc0a-f06c3f7a7cf7, published Sep 14, 2026, 12:37 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Sep 13, 2026, 9:30 AM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:50 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	84,174 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8392dbeb-9535-4ecc-b7c8-854dceaa4e37, published Sep 15, 2026, 8:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	21,954 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9c441119-39aa-4ec7-8e4d-b7baada59775, published Sep 15, 2026, 8:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:40 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	46,467 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 21ebdd7f-eef3-4dc5-ba85-c5207d20b285, published Sep 15, 2026, 8:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:45 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	107,295 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7c38372a-c615-47a7-8b93-a40279e09789, published Sep 15, 2026, 8:19 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:25 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflow	2,806 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 58752758-6b8a-432b-8ecd-7811d26a3ca3, published Sep 15, 2026, 8:11 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:25 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1c5c6ee5-24b7-4a23-902a-c5e48a1b0b47, published Aug 24, 2026, 1:51 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:45 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f9d2e4cd-04ab-43a3-9e17-dac4845b4c7f, published Aug 24, 2026, 1:50 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:40 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 42daa2ab-45c3-42f7-aaf5-df8c4ff5a72b, published Aug 24, 2026, 1:49 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e53b1b67-ba60-4260-9629-25375ce300fa, published Aug 24, 2026, 1:49 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:20 PM EDT	Aug 23, 2026, 12:50 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a56512b4-e6f2-4e0d-a767-0b601b5b6663, published Aug 24, 2026, 1:48 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:20 PM EDT · Map
Aug 23, 2026, 12:15 PM EDT	Aug 23, 2026, 12:25 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflow	5,086 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 616a76cf-7f3f-4cc1-aa86-f268d6274383, published Sep 15, 2026, 8:10 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:15 PM EDT · Map
Aug 23, 2026, 12:15 PM EDT	Aug 23, 2026, 12:25 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0e27d452-50da-49c2-96fa-593a0d644132, published Aug 24, 2026, 1:52 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Aug 23, 2026, 12:15 PM EDT · Map
Jul 30, 2026, 1:35 AM EDT	Jul 30, 2026, 1:50 AM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflow	18,969 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4b23cc5e-ae6b-47df-a7b9-d69a6e12b764, published Aug 15, 2026, 8:38 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 1:35 AM EDT · Map
Jul 30, 2026, 1:35 AM EDT	Jul 30, 2026, 1:50 AM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a80d4cb2-f99c-41ba-b994-4c0e791f16da, published Jul 31, 2026, 7:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 1:35 AM EDT · Map
Jul 30, 2026, 1:20 AM EDT	Jul 30, 2026, 1:35 AM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflow	52,350 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7d07744c-1354-4a61-959f-f3181387b2ae, published Aug 15, 2026, 8:37 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 1:20 AM EDT · Map
Jul 30, 2026, 1:20 AM EDT	Jul 30, 2026, 1:35 AM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 959e72fb-f5d3-4b93-b932-46aaa5c0d514, published Jul 31, 2026, 7:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 1:20 AM EDT · Map
Jul 30, 2026, 12:55 AM EDT	Jul 30, 2026, 1:00 AM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	7,747 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cd0ff68e-459c-4d36-8ba5-efdf6e2005c8, published Aug 15, 2026, 8:40 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:55 AM EDT · Map
Jul 30, 2026, 12:55 AM EDT	Jul 30, 2026, 1:40 AM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	279,757 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f1bce91b-6707-49f9-af85-e75299f7d85d, published Aug 15, 2026, 8:32 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:55 AM EDT · Map
Jul 30, 2026, 12:55 AM EDT	Jul 30, 2026, 1:40 AM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3c6a418c-8acf-4813-9b7f-9dc977343515, published Jul 31, 2026, 7:23 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:55 AM EDT · Map
Jul 30, 2026, 12:55 AM EDT	Jul 30, 2026, 1:00 AM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0716f789-2b3e-4aca-88ff-7f441161d7b3, published Jul 31, 2026, 7:19 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:55 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 1:55 AM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	151,389 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e5484362-261a-4de5-8d92-c22d128d1bdd, published Aug 15, 2026, 8:35 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 1:25 AM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	55,097 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 78fd0742-bf7b-4f6a-a96a-132916bf8d0c, published Aug 15, 2026, 8:33 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 12:55 AM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflow	1,042 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 8c0a6424-1664-4010-b41e-8cfb27f98f8d, published Aug 15, 2026, 8:31 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 12:55 AM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflow	3,285 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0c35b111-68b6-4f1e-9c6f-df25d92f9831, published Aug 15, 2026, 8:30 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 12:55 AM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b352f22d-8972-4e82-ab6d-12e3875bd28c, published Jul 31, 2026, 7:27 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 12:55 AM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 41c51a0b-8611-4240-b63e-ee693b6689df, published Jul 31, 2026, 7:26 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 1:25 AM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 7a741a96-4ff6-49ae-b9b9-62d894430319, published Jul 31, 2026, 7:23 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 30, 2026, 12:50 AM EDT	Jul 30, 2026, 1:55 AM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 9c5a0655-fb7f-4a42-9774-7fc75561faeb, published Jul 31, 2026, 7:22 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 30, 2026, 12:50 AM EDT · Map
Jul 29, 2026, 12:35 PM EDT	Jul 29, 2026, 12:40 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	833 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a1da68ad-bb04-4850-afc3-2d46221ccf52, published Aug 15, 2026, 8:41 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:35 PM EDT · Map
Jul 29, 2026, 12:35 PM EDT	Jul 29, 2026, 12:40 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 307a32b8-3d63-44ce-9960-0fcb07e8f3e5, published Jul 30, 2026, 9:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:35 PM EDT · Map
Jul 29, 2026, 12:30 PM EDT	Jul 29, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	2,181 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e478a203-fd43-41f7-813b-0baa4210ecb2, published Aug 15, 2026, 8:43 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:30 PM EDT · Map
Jul 29, 2026, 12:30 PM EDT	Jul 29, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 1d8b5ea0-b83f-46ec-82a0-9407db3ac3cb, published Jul 30, 2026, 9:20 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:30 PM EDT · Map
Jul 29, 2026, 12:25 PM EDT	Jul 29, 2026, 12:35 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	7,830 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ef3f07c2-e48c-400f-9f6e-f9fa72c12b2a, published Aug 15, 2026, 8:59 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:25 PM EDT · Map
Jul 29, 2026, 12:25 PM EDT	Jul 29, 2026, 12:45 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	23,326 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cc37a907-c582-4e9f-9930-0712689ba5a4, published Aug 15, 2026, 8:42 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:25 PM EDT · Map
Jul 29, 2026, 12:25 PM EDT	Jul 29, 2026, 12:35 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	7,830 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 398a1de7-d89d-42df-b8e1-18bb3043562c, published Aug 15, 2026, 8:29 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:25 PM EDT · Map
Jul 29, 2026, 12:25 PM EDT	Jul 29, 2026, 12:35 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c1006c43-37fe-4edd-a82d-ce1f50d44193, published Aug 15, 2026, 8:25 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:25 PM EDT · Map
Jul 29, 2026, 12:25 PM EDT	Jul 29, 2026, 12:45 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record da9c7d7c-b98e-42d5-bde4-541adf995738, published Jul 30, 2026, 9:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 29, 2026, 12:25 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV039 SOUTH WEBSTER	Combined sewer overflow	7,368 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record cae95c3e-cd62-4270-952f-c87dff9446d8, published Aug 15, 2026, 9:36 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV032 BRADFORD AVE	Combined sewer overflow	49,184 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 638d166f-8485-482c-902d-04cc5ea0f7ec, published Aug 15, 2026, 9:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflow	12,188 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a32139c6-54fa-4cb4-8979-574512e594e2, published Aug 15, 2026, 9:07 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflow	28,785 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f5bd517b-4b68-4842-a301-43f232be05ca, published Aug 15, 2026, 9:06 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflow	10,429 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record bc818866-31c5-4da6-9153-45faed080f81, published Aug 15, 2026, 9:04 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 4:10 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	452,632 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 31051099-34d5-429a-b912-d0d39beb426c, published Aug 15, 2026, 9:01 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 4:20 PM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflow	300,080 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0cae8507-bec3-477f-80b9-aa3bfe18d02a, published Aug 15, 2026, 9:00 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 4:20 PM EDT	Merrimack River, MA	HAV024 VARNUM ST UPPER SIPHON	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 5432053b-d096-4dbf-b313-36a42d75ee31, published Jul 29, 2026, 2:42 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 4:10 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b1dd192e-c6bb-485d-a53b-81ba5d1b9170, published Jul 29, 2026, 2:41 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 664f7d9d-fb47-4569-b7cc-76053ea868a9, published Jul 29, 2026, 2:39 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ab9985ea-6d6b-4230-bc48-7fb21dda880d, published Jul 29, 2026, 2:11 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 999c4f6e-bbae-41b6-8385-9ac830bf24bf, published Jul 29, 2026, 2:11 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV032 BRADFORD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 025c8982-2c3f-4f9d-86fa-63b69e45acf5, published Jul 29, 2026, 2:09 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:40 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV039 SOUTH WEBSTER	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0f0f597f-98fb-42cc-adca-c76eb258df0b, published Jul 29, 2026, 2:09 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:40 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 4:00 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	150,590 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 4f18f35e-5263-4a3a-b98e-47ff51eb4006, published Aug 15, 2026, 9:21 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 3:35 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	0 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record da5d2b2a-604d-41ca-bf56-9a5a6df55220, published Aug 15, 2026, 9:05 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 3:55 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	513,628 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 539cdf73-876e-49f0-8163-77937e0c8933, published Aug 15, 2026, 9:03 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 4:05 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	120,101 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 0b5ef137-2f5e-4dbe-8380-5f6b3701cd74, published Aug 15, 2026, 9:02 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 3:45 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	7,830 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 96b92fe4-220b-4827-a928-d9cf9f89807b, published Aug 15, 2026, 8:56 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 4:05 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2c70a538-660b-461a-ae3e-62aeab8d4881, published Jul 29, 2026, 2:40 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 3:55 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2f240dfc-8dce-4dee-8fb3-1aa88d88d834, published Jul 29, 2026, 2:39 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 3:55 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record dc4475d3-0b99-401b-9fe1-7870f905282f, published Jul 29, 2026, 2:12 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 28, 2026, 3:35 PM EDT	Jul 28, 2026, 4:00 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 22f1ea67-e59f-456d-99e2-8f0e33ff9f66, published Jul 29, 2026, 2:10 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 28, 2026, 3:35 PM EDT · Map
Jul 22, 2026, 12:30 PM EDT	Jul 22, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	1,438 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c33ada61-5026-4082-9503-5f4f06843eec, published Aug 15, 2026, 9:39 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 22, 2026, 12:30 PM EDT · Map
Jul 22, 2026, 12:30 PM EDT	Jul 22, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	4,191 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 583b898c-280c-43a0-9710-58b01370ff58, published Aug 15, 2026, 9:37 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 22, 2026, 12:30 PM EDT · Map
Jul 22, 2026, 12:30 PM EDT	Jul 22, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 134befd7-6242-470d-995e-1eb789786852, published Jul 23, 2026, 7:11 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 22, 2026, 12:30 PM EDT · Map
Jul 22, 2026, 12:30 PM EDT	Jul 22, 2026, 12:35 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 299f8917-a99b-42a1-ab04-24dddac57210, published Jul 23, 2026, 7:10 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 22, 2026, 12:30 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 6:00 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflow	37,323 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f361267b-fe52-44f9-b2c3-d20a9a9242cc, published Aug 15, 2026, 9:44 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:55 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflow	14,083 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 16051771-afda-4598-a0af-600dda14fb17, published Aug 15, 2026, 9:43 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:50 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflow	15,486 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 89d1d36b-165f-45d8-b07d-2d190fa6d276, published Aug 15, 2026, 9:42 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:55 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflow	26,771 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 91ef560d-8a56-4b5d-ab83-8cc1e240c508, published Aug 15, 2026, 9:41 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:45 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflow	451 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 2c0d82e8-baae-4d55-a5f1-c421aa40410b, published Aug 15, 2026, 9:40 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:45 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflow	2,990 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 73463bd5-e182-453f-ad38-907bddd9d6b8, published Aug 15, 2026, 8:28 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:45 PM EDT	Merrimack River, MA	HAV040 BETHANY AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record c7f12014-562f-4c69-a03b-002ccd5cab9f, published Aug 15, 2026, 8:26 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:45 PM EDT	Merrimack River, MA	HAV041 CHESTNUT ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record a584a9e3-74f2-40bb-bb33-9aee3bc1c698, published Jul 22, 2026, 8:45 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:55 PM EDT	“LITTLE RIVER” (not placed)	HAV021F LOCKE STREET CENTER BARRELL	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 3209c6db-80a5-4d5f-9655-102e0526c4ea, published Jul 22, 2026, 8:44 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:50 PM EDT	Merrimack River, MA	HAV021A MIDDLE SIPHON ESSEX ST	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f9d5f35f-7ad0-4fcf-9fad-f470e01397fc, published Jul 22, 2026, 8:43 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 5:55 PM EDT	“LITTLE RIVER” (not placed)	HAV021H WINTER AND HALE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 70104c9e-7247-41f3-b8cd-fa7612aca572, published Jul 22, 2026, 8:42 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jul 21, 2026, 5:40 PM EDT	Jul 21, 2026, 6:00 PM EDT	Merrimack River, MA	HAV034 MIDDLESEX STREET	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record b9ae6fec-861b-4be8-bb4e-e97db4cf42c3, published Jul 22, 2026, 8:41 AM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jul 21, 2026, 5:40 PM EDT · Map
Jun 26, 2026, 10:00 PM EDT	Jun 27, 2026, 12:00 AM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflow	111,661 gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record e397fea8-be59-4c90-8a9d-1dddd0750904, published Jul 15, 2026, 1:58 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jun 26, 2026, 10:00 PM EDT · Map
Jun 26, 2026, 10:00 PM EDT	Jun 27, 2026, 12:00 AM EDT	Merrimack River, MA	HAV013 LOWER SIPHON BUTTONWOOD AVE	Combined sewer overflowrevised	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record 84903dfa-c50f-465e-9bb2-505ed1c65a5a, published Jul 7, 2026, 1:24 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Combined sewer overflow, CITY OF HAVERHILL, Jun 26, 2026, 10:00 PM EDT · Map
Jun 26, 2026, 9:00 PM EDT	Jul 1, 2026, 10:15 AM EDT	Merrimack River, MA	not stated	Sanitary sewer overflow	34.5 million gal	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record f13323a6-f662-484b-a3e3-0e7201accde9, published Jul 15, 2026, 2:12 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Sanitary sewer overflow, CITY OF HAVERHILL, Jun 26, 2026, 9:00 PM EDT · Map
Jun 26, 2026, 9:00 PM EDT	ended, time not reported	Merrimack River, MA	not stated	Sanitary sewer overflow	not reported	CITY OF HAVERHILL (MassDEP sewage notification portal) via MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/), record ea5e65f4-5320-4fee-bf4a-8155c3c5f733, published Jun 27, 2026, 4:05 PM EDT, retrieved 2026-11-02 10:58 UTC · notice	Event: Sanitary sewer overflow, CITY OF HAVERHILL, Jun 26, 2026, 9:00 PM EDT · Map

Showing the newest 100 events of 980 events. See them all with filters.

History

Discharge events, last 12 months85Dec 2025 to Nov 2026
Days with a discharge, last 12 months26Dec 2025 to Nov 2026
Hours under advisory, last 12 months960Dec 2025 to Nov 2026; on this discharger's reports
2026 season under advisory17%May to October; 767 h

Discharge events per month

492 events, Jan 2022 to Nov 2026. Counted from 488 verified or annual reports, 4 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.

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	Bypass, blended or other	Total	Counted from	Coverage
Jan 2022	0	0	0	0		No source
Feb 2022	0	0	0	0		No source
Mar 2022	0	0	0	0		No source
Apr 2022	0	0	0	0		No source
May 2022	0	0	0	0		No source
Jun 2022	0	0	0	0		Partly covered or sparse source
Jul 2022	12	0	0	12	Verified or annual reports
Aug 2022	0	0	0	0
Sep 2022	13	0	1	14	Verified or annual reports
Oct 2022	13	0	0	13	Verified or annual reports
Nov 2022	2	0	0	2	Verified or annual reports
Dec 2022	4	0	0	4	Verified or annual reports
Jan 2023	6	0	0	6	Verified or annual reports
Feb 2023	0	0	0	0
Mar 2023	4	0	0	4	Verified or annual reports
Apr 2023	21	0	1	22	Verified or annual reports
May 2023	2	0	0	2	Verified or annual reports
Jun 2023	37	0	0	37	Verified or annual reports
Jul 2023	34	0	0	34	Verified or annual reports
Aug 2023	48	1	0	49	Verified or annual reports
Sep 2023	17	0	0	17	Verified or annual reports
Oct 2023	1	0	0	1	Verified or annual reports
Nov 2023	3	0	0	3	Verified or annual reports
Dec 2023	16	0	2	18	Verified or annual reports
Jan 2024	16	0	1	17	Verified or annual reports
Feb 2024	0	0	0	0
Mar 2024	20	0	1	21	Verified or annual reports
Apr 2024	3	0	0	3	Verified or annual reports
May 2024	16	0	1	17	Verified or annual reports
Jun 2024	9	0	0	9	Verified or annual reports
Jul 2024	8	0	0	8	Verified or annual reports
Aug 2024	22	0	0	22	Verified or annual reports
Sep 2024	0	0	0	0
Oct 2024	0	0	0	0
Nov 2024	1	0	0	1	Verified or annual reports
Dec 2024	6	1	0	7	Verified or annual reports
Jan 2025	2	0	0	2	Verified or annual reports
Feb 2025	0	0	0	0
Mar 2025	3	1	1	5	Verified or annual reports
Apr 2025	2	0	0	2	Verified or annual reports
May 2025	17	0	2	19	Verified or annual reports
Jun 2025	6	0	0	6	Verified or annual reports
Jul 2025	4	0	0	4	Verified or annual reports
Aug 2025	10	0	0	10	Verified or annual reports
Sep 2025	7	0	0	7	Verified or annual reports
Oct 2025	6	0	0	6	Verified or annual reports
Nov 2025	3	0	0	3	Verified or annual reports
Dec 2025	1	0	0	1	Verified or annual reports
Jan 2026	0	0	0	0
Feb 2026	0	0	0	0
Mar 2026	3	0	0	3	Verified or annual reports
Apr 2026	1	0	0	1	Verified or annual reports
May 2026	9	0	0	9	Verified or annual reports
Jun 2026	18	2	0	20	Verified or annual reports
Jul 2026	33	0	0	33	Verified or annual reports
Aug 2026	6	0	0	6	Verified or annual reports
Sep 2026	8	0	0	8	Verified or annual reports
Oct 2026	4	0	0	4	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 2022-05. 7 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	159	159	744
Aug 2022	0	0	744
Sep 2022	206	206	720
Oct 2022	207	207	744
Nov 2022	98	98	720
Dec 2022	111	111	744
Jan 2023	104	104	744
Feb 2023	0	0	672
Mar 2023	54	54	744
Apr 2023	146	146	720
May 2023	147	147	744
Jun 2023	386	386	720
Jul 2023	264	264	744
Aug 2023	313	313	744
Sep 2023	197	197	720
Oct 2023	50	50	744
Nov 2023	100	100	720
Dec 2023	136	136	744
Jan 2024	170	170	744
Feb 2024	0	0	696
Mar 2024	269	269	744
Apr 2024	102	102	720
May 2024	235	235	744
Jun 2024	64	64	720
Jul 2024	125	125	744
Aug 2024	298	298	744
Sep 2024	0	0	720
Oct 2024	0	0	744
Nov 2024	49	49	720
Dec 2024	106	106	744
Jan 2025	52	52	744
Feb 2025	0	0	672
Mar 2025	155	155	744
Apr 2025	103	103	720
May 2025	236	236	744
Jun 2025	125	125	720
Jul 2025	59	59	744
Aug 2025	138	138	744
Sep 2025	97	97	720
Oct 2025	120	120	744
Nov 2025	71	71	720
Dec 2025	48	48	744
Jan 2026	0	0	744
Feb 2026	0	0	672
Mar 2026	63	63	744
Apr 2026	82	82	720
May 2026	155	155	744
Jun 2026	234	234	720
Jul 2026	206	206	744
Aug 2026	51	51	744
Sep 2026	121	121	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	3
Aug 2022	0
Sep 2022	4
Oct 2022	5
Nov 2022	2
Dec 2022	2
Jan 2023	3
Feb 2023	0
Mar 2023	1
Apr 2023	4
May 2023	3
Jun 2023	9
Jul 2023	6
Aug 2023	10
Sep 2023	5
Oct 2023	1
Nov 2023	2
Dec 2023	4
Jan 2024	3
Feb 2024	0
Mar 2024	7
Apr 2024	2
May 2024	5
Jun 2024	1
Jul 2024	3
Aug 2024	7
Sep 2024	0
Oct 2024	0
Nov 2024	1
Dec 2024	2
Jan 2025	1
Feb 2025	0
Mar 2025	3
Apr 2025	2
May 2025	8
Jun 2025	2
Jul 2025	2
Aug 2025	2
Sep 2025	2
Oct 2025	3
Nov 2025	1
Dec 2025	1
Jan 2026	0
Feb 2026	0
Mar 2026	2
Apr 2026	1
May 2026	3
Jun 2026	8
Jul 2026	6
Aug 2026	1
Sep 2026	2
Oct 2026	2
Nov 2026	0

Reported volume per year

Gallons, summed from the 488 events that gave a number (4 did not).

Partly covered or sparse source

4 of 492 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	3,977,608	45	0	Partly covered or sparse source
2023	107,342,131	193	0
2024	39,091,784	105	0
2025	22,295,607	65	0
2026	43,272,528	80	4

Hours under advisory per year

Hours under advisory each year; 2026 to date.

Advisory in effect
Partly covered or sparse source

7 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	781	8.9%	Partly covered or sparse source
2023	1,897	21.7%
2024	1,419	16.1%
2025	1,203	13.7%
2026	912	12.4%

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). 7 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	19.3%	572	2,958	4,416	yes
2023	30.7%	1,357	4,416	4,416
2024	16.4%	723	4,416	4,416
2025	17.5%	774	4,416	4,416
2026	17.4%	767	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	25	4
Feb	0	4
Mar	33	4
Apr	28	4
May	47	4
Jun	72	5
Jul	91	5
Aug	87	5
Sep	46	5
Oct	24	5
Nov	9	5
Dec	30	4

Discharge events by outfall

The 10 outfalls with the most events of 14, 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
HAV021F LOCKE STREET CENTER BARRELL	131
HAV021H WINTER AND HALE	88
HAV034 MIDDLESEX STREET	50
HAV040 BETHANY AVE	42
HAV041 CHESTNUT ST	40
HAV021A MIDDLE SIPHON ESSEX ST	39
HAV013 LOWER SIPHON BUTTONWOOD AVE	22
HAV024 VARNUM ST UPPER SIPHON	19
HAV039 SOUTH WEBSTER	18
HAV032 BRADFORD AVE	16
Other outfalls (4)	22
Outfall not stated	5

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	25	4
Feb	0	4
Mar	33	4
Apr	28	4
May	47	4
Jun	72	5
Jul	91	5
Aug	87	5
Sep	46	5
Oct	24	5
Nov	9	5
Dec	30	4

Month	Events	Years of records
Jan	25	4
Feb	0	4
Mar	33	4
Apr	28	4
May	47	4
Jun	72	5
Jul	91	5
Aug	87	5
Sep	46	5
Oct	24	5
Nov	9	5
Dec	30	4

Month	Events	Years of records
Jan	25	4
Feb	0	4
Mar	33	4
Apr	28	4
May	47	4
Jun	72	5
Jul	91	5
Aug	87	5
Sep	46	5
Oct	24	5
Nov	9	5
Dec	30	4