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 11476, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice

1. The reported outfall

Outfall reported by Norwalk WPCA (CT0101249): “Manhole, 60 S Smith 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, 8:30 AM EDT

Ended

Sep 13, 2026, 11:30 PM 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

“Unknown. Please see attached memo with additional information.” (not stated whether estimated or measured)

Volume in the source's words

“Unknown. Please see attached memo with additional information.”

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, 8:30 AM EDT to Sep 13, 2026, 11:30 PM EDT
• Advisory in effect Norwalk River: Within the authority's advice window after the discharge ended, Sep 13, 2026, 11:30 PM EDT to Sep 15, 2026, 11:30 PM EDT
• Caution Norwalk River: Within the site's caution window after the discharge ended (data/rules.json), Sep 15, 2026, 11:30 PM EDT to Sep 16, 2026, 11:30 PM 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

11476

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": "08:30 AM",
  "Location of Bypass": "Manhole",
  "Type of Bypass": "Raw Sewage",
  "Cause of Bypass": "Excessive Flows - Storm Event",
  "Cause of Bypass Other Explanation": "On September 13th the City of Norwalk and surrounding area experienced an extreme rain event with extended rainfall totaling 6.21 inches over approximately 5.5 hours, as recorded on the rain gauge located at the Norwalk Wastewater Treatment Facility (WWTF",
  "How was Incident Discovered": "Collections Team rounds during Extreme Rainfall. Phone calls from DPW employees and residents.",
  "Estimated Quantity or Rate of Discharge": "Unknown. Please see attached memo with additional information.",
  "How was estimated Quantity or Rate Determined": "Please see attached memo with additional information.",
  "Reach Waterbody": "Yes",
  "Request ID": "11476",
  "Waterbody Name": "Norwalk River",
  "Date Bypass Ended": "09/13/2026",
  "Event End Time": "11:30 PM",
  "Final Quantity": "Unknown. Please see attached memo with additional information.",
  "How was Final Volume Determined": null,
  "How incident was resolved": "The extreme rain subsided and after many hours the collections system and surface flooding drained.",
  "Municipality": "Norwalk",
  "Address": "60 S Smith St, Norwalk, CT",
  "_view": "SSO DATA VIEW"
}