What is the address of Seymour WPCF?

The address on the plant’s EPA facility record is 723 Derby Avenue, Ext, Seymour, CT 06483, in New Haven County. Its coordinates are 41.3658, -73.0889. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Seymour WPCF treat?

Seymour WPCF treats an average of 1.12 MGD and is permitted for a design flow of 2.93 MGD.

What treatment technology does Seymour WPCF use?

Klarifi has identified one treatment structure or unit process at the Seymour facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Seymour WPCF?

The facility discharges under NPDES permit CT0100501, currently expired, expiring March 2026.

Is Seymour WPCF in compliance?

Discharge monitoring reports show 6 violations at Seymour WPCF in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Seymour WPCF and how do I contact them?

Seymour WPCF is a publicly owned treatment works in Seymour, Connecticut. Klarifi lists 3 verified decision-maker contacts for this facility, available with a free trial.

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Seymour WPCF

723 Derby Avenue, Ext, Seymour, CT 06483 · New Haven County · Publicly Owned Treatment Works

Average flow: 1.12 MGD

Design flow: 2.93 MGD

NPDES permit: CT0100501; Expired

Permit expires: March 2026

Population served: 19,233; CWNS 2022

Seymour WPCF is a publicly owned wastewater treatment works in Seymour, New Haven County, Connecticut treating an average of 1.12 million gallons per day against a permitted design capacity of 2.93 MGD, serving about 19,233 residents. It discharges under NPDES permit CT0100501 (expired), which expires in March 2026, with 6 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Seymour WPCF.

Available with a free Klarifi account

See the full treatment train at Seymour WPCF: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 6

Effluent violations: 4

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

3 verified contacts for Seymour WPCF, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Seymour WPCF, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Connecticut

Ansonia Water Pollution Control Facility

Ansonia · 2 mi away

1.71 MGD

Shelton Water Pollution Control Facility

Shelton · 4 mi away

2.12 MGD

Beacon Falls Water Pollution Control Fac

Beacon Falls · 5 mi away

0.34 MGD

Milford - Housatonic WPCF

Milford · 10 mi away

5.85 MGD

Newtown /wpcf

Newtown · 11 mi away

0.34 MGD

Stratford Water Pollution Control Facility

Stratford · 13 mi away

7.32 MGD

Eastside Water Pollution Control Facility

Bridgeport · 14 mi away

5.24 MGD

Westside Water Pollution Control Facility

Bridgeport · 16 mi away

17.54 MGD

Seymour WPCF: frequently asked questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed October 26, 2026; facility record last updated February 27, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms

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