Combined sewer overflow: City of Manchester DPW Environmental Protection Division

Ended (as reported) · City of Manchester EPD (CSO Discharge Notification page)

Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14000, reported Sep 29, 2026, 11:39 AM EDT, retrieved 2026-11-02 11:55 UTC · notice

No current report on Merrimack River: Unresolved: no end reported (off the map after 30 days), until Dec 28, 2026, 10:39 AM EST unless a new report changes it.

Why this colour: No current report: nothing a covering source reports colours this water now. How long a water stays coloured, and why

No current report on Piscataquog River: Unresolved: no end reported (off the map after 30 days), until Dec 28, 2026, 10:39 AM EST unless a new report changes it.

Why this colour: No current report: nothing a covering source reports colours this water now. How long a water stays coloured, and why

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

1. The reported outfall

Outfall reported by City of Manchester DPW Environmental Protection Division (NH0100447). Location: no coordinates in the record or the outfall registry.

2. Waters named in the notice

The notice names no water. We place it on Merrimack River, NH, Piscataquog River, NH. Inferred (for example from the discharger's receiving water); the source does not name the water.

3. Modeled downstream reach

No modeled reach for this record in this build.

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: not reported
Ended: Sep 28, 2026, 11:39 PM EDT
Precision: Known to the minute
Reported to the source: Sep 29, 2026, 11:39 AM EDT
Published: Sep 29, 2026, 11:39 AM EDT
Source last updated: not given
We fetched it: 2026-11-02 11:55 UTC

What and how much

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

Advice

The record carries no advice text from City of Manchester EPD (CSO Discharge Notification page).

Advice window: not stated in the record; the state's window on the methods page applies
Basis: not stated

What it does to the map, over time

Caution Merrimack River: Discharge record with no status and no reported end, Sep 29, 2026, 11:39 AM EDT to Oct 13, 2026, 11:39 AM EDT
Unresolved: no end reported Merrimack River: Unresolved: no end reported, Oct 13, 2026, 11:39 AM EDT to Oct 29, 2026, 11:39 AM EDT
No current report Merrimack River: Unresolved: no end reported (off the map after 30 days), Oct 29, 2026, 11:39 AM EDT to Dec 28, 2026, 10:39 AM EST
Caution Piscataquog River: Discharge record with no status and no reported end, Sep 29, 2026, 11:39 AM EDT to Oct 13, 2026, 11:39 AM EDT
Unresolved: no end reported Piscataquog River: Unresolved: no end reported, Oct 13, 2026, 11:39 AM EDT to Oct 29, 2026, 11:39 AM EDT
No current report Piscataquog River: Unresolved: no end reported (off the map after 30 days), Oct 29, 2026, 11:39 AM EDT to Dec 28, 2026, 10:39 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: nh-permittees
Record id at the source: manchester:Item14000
Original notice: https://www.manchesternh.gov/Departments/Sewer-and-Stormwater/CSO/C…
Revision of: none (first record)
Revised by: no later revision

Every field of the record

All fields of event nh-permittees:manchester:Item14000
`event_id`	nh-permittees:manchester:Item14000
`source_id`	nh-permittees
`source_record_id`	manchester:Item14000
`parent_event_id`	null
`event_type`	cso
`status`	ended
`discharger_id`	nh-manchester-epd
`discharger_name`	City of Manchester DPW Environmental Protection Division
`npdes_permit`	NH0100447
`outfall_id`	null
`outfall_name`	null
`waterbody_text`	null
`water_slugs`	["merrimack-river-nh","piscataquog-river-nh"]
`water_match`	inferred
`lat`	null
`lon`	null
`coord_source`	null
`coord_precision_m`	null
`started_at`	null
`ended_at`	2026-09-28T23:39:00-04:00
`time_precision`	minute
`reported_at`	2026-09-29T11:39:00-04:00
`published_at`	2026-09-29T11:39:00-04:00
`source_updated_at`	null
`fetched_at`	2026-11-02T11:55:02Z
`material`	combined sewage and stormwater (CSO)
`volume_gal`	null
`volume_text`	null
`estimate_flag`	unknown
`authority`	City of Manchester EPD (CSO Discharge Notification page)
`advice_text`	null
`advice_window_hours`	null
`advice_window_basis`	null
`source_url`	https://www.manchesternh.gov/Departments/Sewer-and-Stormwater/CSO/CSO-Discharge-Notification#Item14000
`parse_error`	null
`fixture`	false
`file`	events/nh-permittees~3Amanchester~3AItem14000.json
`duplicate_of`	null
`placement_note`	null
`unplaced_reason`	null
`set_aside`	null
`superseded`	null
`reach`	null
`reach_band`	null

The source's record (raw)

{
  "item_id": "Item14000",
  "title": "City Of Manchester CSO Notification - No Activations for 12 Hours",
  "published": "Published: 09/29/2026 11:39 AM",
  "body": "Please be advised that the City of Manchester has experienced no CSO activations during the past 12 hours. For more detailed CSO discharge information please go to EPD's website at: https://www.manchesternh.gov/csomap Thank you About Public Works Services Cemeteries Municipal Buildings Parks and Recreation Sewer and Stormwater Streets and Sidewalks Trash and Recycling CSO Links CSO Discharge Notification CSO Discharge Map Supplemental CSO Information EPD Related Links Administration Cemetery Brook Drain Tunnel Project Contact EPD CSO CSO 50/50 Sewer Backflow Program Departmental Expenditures EPD Announcements Industrial Pretreatment Pond Restoration Septage Receiving Facility Sewer Billing Stormwater Wastewater Treatment Plant City Hall One City Hall Plaza Manchester, NH 03101 United States. &nbsp; Open Monday - Friday From 8 AM to 5 PM City Government Agenda & Minutes Boards & Commissions City Directory Elections Government Records Meetings About Manchester Alert Notifications City An",
  "kind": "all_clear"
}

Source: City of Manchester EPD (CSO Discharge Notification page) via nh-permittees, record manchester:Item14000, reported Sep 29, 2026, 11:39 AM EDT, retrieved 2026-11-02 11:55 UTC · notice

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