Combined sewer overflow: CITY OF HOLYOKE, Oct 11, 2026

Ended (as reported) · CITY OF HOLYOKE (MassDEP sewage notification portal)

Source: 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

Unresolved: no end reported on Connecticut River: Unresolved: no end reported, until Nov 12, 2026, 7:06 AM EST unless a new report changes it.

Why this colour: Unresolved: no end reported: a discharge was reported and its end never was; shown hatched yellow until 30 days after it started. Rationale: From day 7 to day 30 the reach or water is shown hatched yellow 'unresolved: no end reported', listed under active discharges with that label. (source: rules.json unresolved) How long a water stays coloured, and why

Unresolved: no end reported on Connecticut River: Unresolved: no end reported, until Nov 12, 2026, 7:06 AM EST unless a new report changes it.

A report is not a test of the water. See how statuses are worked out.

1. The reported outfall

Outfall reported by CITY OF HOLYOKE (MA0101630 outfall HOL019): “YALE ST.”. Location: 42.21960, -72.61310, from the state's or EPA's outfall layer.

2. Waters named in the notice

The notice names: “CONNECTICUT R.”. We place it on Connecticut River, MA. Matched by the name of the water in the source record.

3. Modeled downstream reach

Modeled downstream reach (estimate, not verified by sampling). Computed by DirtyWaterWatch from the river network and the nearest flow gauge; it is not an official advisory area.

Unresolved: no end reported 0 to 1 km below the outfall

0 to 1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in under an hour (it could be as soon as under an hour) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 1 to 1.1 km below the outfall

1 to 1.1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in under an hour (it could be as soon as under an hour) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 1.1 to 1.8 km below the outfall

1.1 to 1.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 1 hour (it could be as soon as under an hour) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 1.8 to 4 km below the outfall

1.8 to 4 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 3 hours (it could be as soon as about 2 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 4 to 4.4 km below the outfall

4 to 4.4 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 3 hours (it could be as soon as about 2 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 4.4 to 9.1 km below the outfall

4.4 to 9.1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 6 hours (it could be as soon as about 4 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 9.1 to 10.6 km below the outfall

9.1 to 10.6 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 7 hours (it could be as soon as about 4 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 10.6 to 10.8 km below the outfall

10.6 to 10.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 7 hours (it could be as soon as about 4 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 10.8 to 13.8 km below the outfall

10.8 to 13.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 9 hours (it could be as soon as about 5 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 13.8 to 14.5 km below the outfall

13.8 to 14.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 9 hours (it could be as soon as about 6 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 14.5 to 19.2 km below the outfall

14.5 to 19.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 12 hours (it could be as soon as about 7 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 19.2 to 19.5 km below the outfall

19.2 to 19.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 13 hours (it could be as soon as about 8 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 19.5 to 20.3 km below the outfall

19.5 to 20.3 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 13 hours (it could be as soon as about 8 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 20.3 to 21.7 km below the outfall

20.3 to 21.7 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 14 hours (it could be as soon as about 8 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 21.7 to 23 km below the outfall

21.7 to 23 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 15 hours (it could be as soon as about 9 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 23 to 23.5 km below the outfall

23 to 23.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 15 hours (it could be as soon as about 9 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 23.5 to 25.1 km below the outfall

23.5 to 25.1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 16 hours (it could be as soon as about 10 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 25.1 to 25.2 km below the outfall

25.1 to 25.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 16 hours (it could be as soon as about 10 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 25.2 to 26.6 km below the outfall

25.2 to 26.6 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 17 hours (it could be as soon as about 10 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 26.6 to 28.2 km below the outfall

26.6 to 28.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 18 hours (it could be as soon as about 11 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 28.2 to 28.2 km below the outfall

28.2 to 28.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 18 hours (it could be as soon as about 11 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 28.2 to 29.5 km below the outfall

28.2 to 29.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 19 hours (it could be as soon as about 11 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 29.5 to 29.8 km below the outfall

29.5 to 29.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 19 hours (it could be as soon as about 11 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 29.8 to 30 km below the outfall

29.8 to 30 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 19 hours (it could be as soon as about 12 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 30 to 31.1 km below the outfall

30 to 31.1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 20 hours (it could be as soon as about 12 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 31.1 to 36.4 km below the outfall

31.1 to 36.4 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 23 hours (it could be as soon as about 14 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 36.4 to 39.5 km below the outfall

36.4 to 39.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 25 hours (it could be as soon as about 15 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.
Unresolved: no end reported 39.5 to 40 km below the outfall

39.5 to 40 km below the outfall · on Connecticut River

If sewage entered the river at outfall 19 at Oct 11 17:30, water from that point would typically reach here in about 25 hours (it could be as soon as about 15 hours) at the river flow measured at CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA (3280 cfs) at 2026-11-02T11:30:00+00:00. This is a calculation from published USGS methods, not a measurement of bacteria. It does not mark where the river is or is not fit for contact.

Model stops here: 40 km cap.

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.

Open on the main map

When: three different times

The time of the event, the time the source reported, published or updated it, and the time we fetched it are kept apart. Times are shown in New England time; the record keeps the original offsets.

Started: Oct 11, 2026, 5:30 PM EDT
Ended: not reported
Precision: Known to the minute
Reported to the source: not given
Published: Oct 13, 2026, 8:06 AM EDT
Source last updated: not given
We fetched it: 2026-11-02 11:54 UTC

What and how much

Type: Combined sewer overflow
Status in the record: Ended (as reported)
Material: “CSO – UnTreated”
Volume: not reported (not stated whether estimated or measured)
Volume in the source's words: none

Advice

“Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants. See website for more information on whether specific resource areas, such as bathing beaches, are affected.”
CITY OF HOLYOKE (MassDEP sewage notification portal) · 314 CMR 16.04(10)(g)

Advice window: 48 hours
Basis: 314 CMR 16.04(10)(g)

What it does to the map, over time

Caution Connecticut River: Discharge record with no status and no reported end, Oct 11, 2026, 5:30 PM EDT to Oct 27, 2026, 8:06 AM EDT
Unresolved: no end reported Connecticut River: Unresolved: no end reported, Oct 27, 2026, 8:06 AM EDT to Nov 12, 2026, 7:06 AM EST
No current report Connecticut River: Unresolved: no end reported (off the map after 30 days), Nov 12, 2026, 7:06 AM EST to Jan 9, 2027, 4:30 PM EST
Caution Connecticut River: Discharge record with no status and no reported end, Oct 11, 2026, 5:30 PM EDT to Oct 27, 2026, 8:06 AM EDT
Unresolved: no end reported Connecticut River: Unresolved: no end reported, Oct 27, 2026, 8:06 AM EDT to Nov 12, 2026, 7:06 AM EST
No current report Connecticut River: Unresolved: no end reported (off the map after 30 days), Nov 12, 2026, 7:06 AM EST to Jan 9, 2027, 4:30 PM EST

Source: intervals computed by DirtyWaterWatch (build/status.py) from this record and the rules on the methods page, as of 2026-11-02 11:56 UTC.

Source and revisions

Source: MassDEP CSO API behind the portal (eeaonline.eea.state.ma.us/dep/CSOAPI/api/)
Record id at the source: 496ef276-19b0-4bdb-b8a9-0f8233f2875e
Original notice: https://eeaonline.eea.state.ma.us/portal/dep/cso-data-portal/detail…
Revision of: none (first record)
Revised by: no later revision

Every field of the record

All fields of event ma-massdep:496ef276-19b0-4bdb-b8a9-0f8233f2875e
`event_id`	ma-massdep:496ef276-19b0-4bdb-b8a9-0f8233f2875e
`source_id`	ma-massdep
`source_record_id`	496ef276-19b0-4bdb-b8a9-0f8233f2875e
`parent_event_id`	null
`event_type`	cso
`status`	ended
`discharger_id`	ma-holyoke
`discharger_name`	CITY OF HOLYOKE
`npdes_permit`	MA0101630
`outfall_id`	HOL019
`outfall_name`	YALE ST.
`waterbody_text`	CONNECTICUT R.
`water_slugs`	["connecticut-river-ma"]
`water_match`	name
`lat`	42.219601
`lon`	-72.613101
`coord_source`	outfall_layer
`coord_precision_m`	null
`started_at`	2026-10-11T17:30:00-04:00
`ended_at`	null
`time_precision`	minute
`reported_at`	null
`published_at`	2026-10-13T08:06:12-04:00
`source_updated_at`	null
`fetched_at`	2026-11-02T11:54:49Z
`material`	CSO – UnTreated
`volume_gal`	null
`volume_text`	null
`estimate_flag`	unknown
`authority`	CITY OF HOLYOKE (MassDEP sewage notification portal)
`advice_text`	Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants. See website for more information on whether specific resource areas, such as bathing beaches, are affected.
`advice_window_hours`	48
`advice_window_basis`	314 CMR 16.04(10)(g)
`source_url`	https://eeaonline.eea.state.ma.us/portal/dep/cso-data-portal/details/496ef276-19b0-4bdb-b8a9-0f8233f2875e
`parse_error`	null
`fixture`	false
`reach`	MA0101630-19
`file`	events/ma-massdep~3A496ef276-19b0-4bdb-b8a9-0f8233f2875e.json
`duplicate_of`	null
`placement_note`	null
`unplaced_reason`	null
`set_aside`	null
`superseded`	null
`reach_band`	{"event_id":"ma-massdep:496ef276-19b0-4bdb-b8a9-0f8233f2875e","reach":"MA0101630-19","status":"unresolved","rule":"unresolved","label":"Unresolved: no end reported","short":"CSO of Oct 11 17:30: unresolved, no end reported · CITY OF HOLYOKE · on a modeled downstream reach","rule_applied":{"rule":"unresolved.unresolved_yellow_days","days":30,"rationale":"From day 7 to day 30 the reach or water is shown hatched yellow 'unresolved: no end reported', listed under active discharges with that label; after 30 days it leaves the map but stays flagged unresolved on the water and event pages.","source":"data/rules.json"},"started_at":"2026-10-11T17:30:00-04:00","hours_since_start":518.4,"gauge":"USGS-01172010","gauge_name":"CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA","flow_cfs":3280,"flow_time":"2026-11-02T11:30:00+00:00","gauge_km":3.1,"flow_basis":"USGS 01172010 discharge 3280 cfs at 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The source's record (raw)

{
  "incidentId": "496ef276-19b0-4bdb-b8a9-0f8233f2875e",
  "incidentNumber": "26017778",
  "incidentDate": "2026-10-11T00:00:00",
  "incidentTime": "17:30",
  "amPm": null,
  "reporterClass": "Public Notification Report",
  "eventType": "CSO – UnTreated",
  "permiteeClass": "CSO",
  "permiteeName": "CITY OF HOLYOKE",
  "permiteeId": "MA0101630",
  "outfallId": "HOL019",
  "municipality": "HOLYOKE",
  "reportingType": "Initial-Ceased",
  "location": "YALE ST.",
  "latitude": null,
  "longitude": null,
  "waterBody": "CONNECTICUT R.",
  "waterBodyDescription": null,
  "volumnOfEvent": "",
  "rainfallData": "",
  "hours": "",
  "minutes": "",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-10-13T08:06:12.43",
  "parentIncidentId": null,
  "_report_class": "Public Notification Report",
  "_tz_assumed": "America/New_York (portal gives local clock time without zone)",
  "_ended_note": "reported ceased; the portal gives no cessation time",
  "_coords": "MassDEP CSOs layer DEP_OUTFL_ HOL019 (locations are estimates)",
  "_water": {
    "via": "crosswalk on portal waterbody",
    "text": "CONNECTICUT R.",
    "confidence": "high"
  },
  "_advice_source": "required wording of 314 CMR 16.04(10)(g); the permittee's own advisory is only in an attachment the portal will not serve"
}

Personal fields (names, emails, phone numbers of staff) are removed from raw records before they are stored.