Connecticut / Events /

Sanitary sewer overflow: Norwalk WPCA, Sep 13, 2026

Ended (as reported) · Norwalk WPCA (CT DEEP Performance Dashboard)

Source: Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 11432, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice

1. The reported outfall

Outfall reported by Norwalk WPCA (CT0101249): “Pump Station, 95 N Water St, Norwalk, CT”. Location: no coordinates in the record or the outfall registry.

2. Waters named in the notice

The notice names: “Norwalk River”. We place it on Norwalk River, CT. Matched by the name of the water in the source record.

3. Modeled downstream reach

No modeled reach for this record in this build.

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

Sep 13, 2026, 9:30 AM EDT

Ended

Sep 13, 2026, 11:30 AM EDT

Precision

Known to the minute

Reported to the source

not given

Published

not given

Source last updated

not given

We fetched it

2026-11-02 11:20 UTC

What and how much

Type

Sanitary sewer overflow

Status in the record

Ended (as reported)

Material

“Raw Sewage”

Volume

“Unable to determine due to tidal impact of receiving waters” (not stated whether estimated or measured)

Volume in the source's words

“Unable to determine due to tidal impact of receiving waters”

Advice

The record carries no advice text from Norwalk WPCA (CT DEEP Performance Dashboard).

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

• Advisory in effect Norwalk River: Discharge in progress, Sep 13, 2026, 9:30 AM EDT to Sep 13, 2026, 11:30 AM EDT
• Advisory in effect Norwalk River: Within the authority's advice window after the discharge ended, Sep 13, 2026, 11:30 AM EDT to Sep 15, 2026, 11:30 AM EDT
• Caution Norwalk River: Within the site's caution window after the discharge ended (data/rules.json), Sep 15, 2026, 11:30 AM EDT to Sep 16, 2026, 11:30 AM EDT

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

CT DEEP CSO/SSO Performance Dashboard (QScend)

Record id at the source

11432

Original notice

https://deepct.qscend.mygovcenter.com/cms/cms?id=1

Revision of

none (first record)

Revised by

no later revision

{
  "Reporting Utility": "NORWALK WPCF",
  "Status": "Closed",
  "Incident Type": "Sewage Bypass",
  "Weather Conditions": "Rain 2-3\" per hour",
  "Date Bypass Began or was Discovered": "09/13/2026",
  "Event Start Time": "09:30 AM",
  "Location of Bypass": "Pump Station",
  "Type of Bypass": "Raw Sewage",
  "Cause of Bypass": "Excessive Flows - Storm Event",
  "Cause of Bypass Other Explanation": "The City of Norwalk has received over 5in of rainfall over the last few hours. The system is functioning properly but is experiencing excessive flows.",
  "How was Incident Discovered": "The level sensor on the Ann St Siphon Station is reading above 9.25' which is the height for the emergency outfall pipe.",
  "Estimated Quantity or Rate of Discharge": "Unable to determine due to tidal impact of receiving waters",
  "How was estimated Quantity or Rate Determined": "See above",
  "Reach Waterbody": "Yes",
  "Request ID": "11432",
  "Waterbody Name": "Norwalk River",
  "Date Bypass Ended": "09/13/2026",
  "Event End Time": "11:30 AM",
  "Final Quantity": "Unable to determine due to tidal impact of receiving waters",
  "How was Final Volume Determined": null,
  "How incident was resolved": "As the rain subsided the collections system began to drain to the WPCF causing the overflow to stop.",
  "Municipality": "Norwalk",
  "Address": "95 N Water St, Norwalk, CT",
  "_view": "SSO DATA VIEW"
}