Combined sewer overflow: CITY OF HOLYOKE, Oct 16, 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 ea8906b2-6869-4463-a9e7-795e827e826e, published Oct 19, 2026, 8:30 AM EDT, retrieved 2026-11-02 11:54 UTC · notice

Caution on Connecticut River: Discharge record with no status and no reported end, until Nov 2, 2026, 7:30 AM EST unless a new report changes it.

Why this colour: Caution: site default, 72 hours after the discharge ended. Rationale: Untreated sewage and stormwater; CSO effluent median 215,000 fecal coliform/100 mL (EPA 2004), needing about a thousandfold dilution to reach the beach value. (source: research/science/report.md 2.8) How long a water stays coloured, and why

Caution on Connecticut River: Discharge record with no status and no reported end, until Nov 2, 2026, 7:30 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 HOL09): “BERKSHIRE ST.”. Location: 42.19009, -72.61238, 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.

Caution 0 to 3.8 km below the outfall

0 to 3.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 3.8 to 5.4 km below the outfall

3.8 to 5.4 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 4 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.
Caution 5.4 to 5.6 km below the outfall

5.4 to 5.6 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 4 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.
Caution 5.6 to 8.6 km below the outfall

5.6 to 8.6 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 8.6 to 9.3 km below the outfall

8.6 to 9.3 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 9.3 to 14 km below the outfall

9.3 to 14 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 10 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.
Caution 14 to 14.3 km below the outfall

14 to 14.3 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 10 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.
Caution 14.3 to 15.1 km below the outfall

14.3 to 15.1 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 11 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.
Caution 15.1 to 16.5 km below the outfall

15.1 to 16.5 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 16.5 to 17.8 km below the outfall

16.5 to 17.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 13 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.
Caution 17.8 to 18.3 km below the outfall

17.8 to 18.3 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 18.3 to 19.9 km below the outfall

18.3 to 19.9 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 19.9 to 20 km below the outfall

19.9 to 20 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 20 to 21.4 km below the outfall

20 to 21.4 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 21.4 to 23 km below the outfall

21.4 to 23 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 16 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.
Caution 23 to 23 km below the outfall

23 to 23 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 23 to 24.2 km below the outfall

23 to 24.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 24.2 to 24.6 km below the outfall

24.2 to 24.6 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 24.6 to 24.8 km below the outfall

24.6 to 24.8 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 24.8 to 25.9 km below the outfall

24.8 to 25.9 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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.
Caution 25.9 to 31.2 km below the outfall

25.9 to 31.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 22 hours (it could be as soon as about 13 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.
Caution 31.2 to 34.2 km below the outfall

31.2 to 34.2 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, water from that point would typically reach here in about 24 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.
Caution 34.2 to 36.3 km below the outfall

34.2 to 36.3 km below the outfall · on Connecticut River

If sewage entered the river at outfall 09 at Oct 16 08:30, 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: tidal below this point. Below this point water moves back and forth with the tide and wind, so we do not model where the discharge goes. See the official notice and local beach or shellfish advisories.

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 16, 2026, 8:30 AM EDT
Ended: not reported
Precision: Known to the minute
Reported to the source: not given
Published: Oct 19, 2026, 8:30 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 – Treated”
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 16, 2026, 8:30 AM EDT to Nov 2, 2026, 7:30 AM EST
Unresolved: no end reported Connecticut River: Unresolved: no end reported, Nov 2, 2026, 7:30 AM EST to Nov 18, 2026, 7:30 AM EST
No current report Connecticut River: Unresolved: no end reported (off the map after 30 days), Nov 18, 2026, 7:30 AM EST to Jan 14, 2027, 7:30 AM EST
Caution Connecticut River: Discharge record with no status and no reported end, Oct 16, 2026, 8:30 AM EDT to Nov 2, 2026, 7:30 AM EST
Unresolved: no end reported Connecticut River: Unresolved: no end reported, Nov 2, 2026, 7:30 AM EST to Nov 18, 2026, 7:30 AM EST
No current report Connecticut River: Unresolved: no end reported (off the map after 30 days), Nov 18, 2026, 7:30 AM EST to Jan 14, 2027, 7:30 AM 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: ea8906b2-6869-4463-a9e7-795e827e826e
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:ea8906b2-6869-4463-a9e7-795e827e826e
`event_id`	ma-massdep:ea8906b2-6869-4463-a9e7-795e827e826e
`source_id`	ma-massdep
`source_record_id`	ea8906b2-6869-4463-a9e7-795e827e826e
`parent_event_id`	null
`event_type`	cso
`status`	ended
`discharger_id`	ma-holyoke
`discharger_name`	CITY OF HOLYOKE
`npdes_permit`	MA0101630
`outfall_id`	HOL09
`outfall_name`	BERKSHIRE ST.
`waterbody_text`	CONNECTICUT R.
`water_slugs`	["connecticut-river-ma"]
`water_match`	name
`lat`	42.190085
`lon`	-72.612381
`coord_source`	outfall_layer
`coord_precision_m`	null
`started_at`	2026-10-16T08:30:00-04:00
`ended_at`	null
`time_precision`	minute
`reported_at`	null
`published_at`	2026-10-19T08:30:24-04:00
`source_updated_at`	null
`fetched_at`	2026-11-02T11:54:49Z
`material`	CSO – Treated
`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/ea8906b2-6869-4463-a9e7-795e827e826e
`parse_error`	null
`fixture`	false
`reach`	MA0101630-09
`file`	events/ma-massdep~3Aea8906b2-6869-4463-a9e7-795e827e826e.json
`duplicate_of`	null
`placement_note`	null
`unplaced_reason`	null
`set_aside`	null
`superseded`	null
`reach_band`	{"event_id":"ma-massdep:ea8906b2-6869-4463-a9e7-795e827e826e","reach":"MA0101630-09","status":"yellow","rule":"no_end","label":"Discharge record with no status and no reported end","short":"CSO with no reported end · CITY OF HOLYOKE · on a modeled downstream reach","rule_applied":{"rule":"unresolved.unknown_status_yellow_days","days":14,"rationale":"A discharge record with status unknown (an alert with no incident report, an unparsed notice) is yellow for 14 days from its report time, then unresolved as above.","source":"data/rules.json"},"started_at":"2026-10-16T08:30:00-04:00","hours_since_start":407.4,"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":0.3,"flow_basis":"USGS 01172010 discharge 3280 cfs at 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The source's record (raw)

{
  "incidentId": "ea8906b2-6869-4463-a9e7-795e827e826e",
  "incidentNumber": "26017860",
  "incidentDate": "2026-10-16T00:00:00",
  "incidentTime": "08:30",
  "amPm": null,
  "reporterClass": "Public Notification Report",
  "eventType": "CSO – Treated",
  "permiteeClass": "CSO",
  "permiteeName": "CITY OF HOLYOKE",
  "permiteeId": "MA0101630",
  "outfallId": "HOL09",
  "municipality": "HOLYOKE",
  "reportingType": "Initial-Ceased",
  "location": "BERKSHIRE ST.",
  "latitude": null,
  "longitude": null,
  "waterBody": "CONNECTICUT R.",
  "waterBodyDescription": null,
  "volumnOfEvent": "",
  "rainfallData": "",
  "hours": "",
  "minutes": "",
  "month": null,
  "year": null,
  "additionalInformation": null,
  "submittedDate": "2026-10-19T08:30:24.443",
  "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_ HOL09 (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.