How much wastewater does Marion WPC treat?

Marion WPC treats an average of 4.64 MGD and is permitted for a design flow of 10.5 MGD.

What treatment technology does Marion WPC use?

Klarifi has identified clarifiers, uncovered lagoons at the Marion facility.

What is the NPDES permit for Marion WPC?

The facility discharges under NPDES permit OH0026352, currently effective, expiring April 2030.

Is Marion WPC in compliance?

Discharge monitoring reports show 14 violations at Marion WPC in the last three years, 10 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Marion WPC and how do I contact them?

Marion WPC is a publicly owned treatment works in Marion, Ohio. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Marion WPC

Marion, OH · Marion County · Publicly Owned Treatment Works

Average flow: 4.64 MGD

Design flow: 10.5 MGD

NPDES permit: OH0026352; Effective

Permit expires: April 2030

Population served: 36,310; CWNS 2022

Marion WPC is a publicly owned wastewater treatment plant in Marion, Marion County, Ohio treating an average of 4.64 million gallons per day against a permitted design capacity of 10.5 MGD, serving about 36,310 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit OH0026352 (effective), which expires in April 2030, with 14 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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Compliance snapshot (last 3 years)

Total violations: 14

Effluent violations: 10

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

Key contacts

1 verified contact for Marion WPC, with validated emails and direct phone numbers.

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

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Grandview Estates Sd 2a

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New Bloomington WWTP

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Groves At Newmans Crossing POTW

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Marion WPC: 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 19, 2026.

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