How much wastewater does Duncan Public Utilities Auth treat?

Duncan Public Utilities Auth treats an average of 1.75 MGD and is permitted for a design flow of 4.5 MGD.

What is the NPDES permit for Duncan Public Utilities Auth?

The facility discharges under NPDES permit OK0026638, currently effective, expiring July 2028.

Is Duncan Public Utilities Auth in compliance?

Discharge monitoring reports show 380 violations at Duncan Public Utilities Auth in the last three years, 36 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Duncan Public Utilities Auth and how do I contact them?

Duncan Public Utilities Auth is a publicly owned treatment works in Duncan, Oklahoma. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Duncan Public Utilities Auth

Q: What treatment technology does Duncan Public Utilities Auth use?

Klarifi has identified clarifiers, uncovered lagoons, carrousels / oxidation ditches at the Duncan facility.

Duncan, OK · Stephens County · Publicly Owned Treatment Works

Average flow: 1.75 MGD

Design flow: 4.5 MGD

NPDES permit: OK0026638; Effective

Permit expires: July 2028

Population served: 23,714; CWNS 2022

Duncan Public Utilities Auth is a publicly owned wastewater treatment plant in Duncan, Stephens County, Oklahoma treating an average of 1.75 million gallons per day against a permitted design capacity of 4.5 MGD, serving about 23,714 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit OK0026638 (effective), which expires in July 2028, with 380 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Clarifiers

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Uncovered lagoons

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Carrousels / oxidation ditches

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Compliance snapshot (last 3 years)

Total violations: 380

Effluent violations: 36

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

Key contacts

1 verified contact for Duncan Public Utilities Auth, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Duncan Public Utilities Auth, plus the full compliance history and discharge data.

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Duncan Public Utilities Auth: 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 September 11, 2026; facility record last updated August 18, 2026.

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