How much wastewater does West Unity STP treat?

West Unity STP treats an average of 0.23 MGD and is permitted for a design flow of 0.33 MGD.

What treatment technology does West Unity STP use?

Klarifi has identified clarifiers, carrousels / oxidation ditches at the West Unity facility.

What is the NPDES permit for West Unity STP?

The facility discharges under NPDES permit OH0020303, currently effective, expiring November 2027.

Is West Unity STP in compliance?

Discharge monitoring reports show 22 violations at West Unity STP in the last three years, 18 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates West Unity STP and how do I contact them?

West Unity STP is a publicly owned treatment works in West Unity, Ohio. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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West Unity STP

West Unity, OH · Williams County · Publicly Owned Treatment Works

Average flow: 0.23 MGD

Design flow: 0.33 MGD

NPDES permit: OH0020303; Effective

Permit expires: November 2027

Population served: 1,763; CWNS 2022

West Unity STP is a publicly owned wastewater treatment works in West Unity, Williams County, Ohio treating an average of 0.23 million gallons per day against a permitted design capacity of 0.33 MGD, serving about 1,763 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit OH0020303 (effective), which expires in November 2027, with 22 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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Carrousels / oxidation ditches

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Compliance snapshot (last 3 years)

Total violations: 22

Effluent violations: 18

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

Key contacts

Decision-makers at West Unity STP.

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West Unity STP: 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 May 23, 2025.

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