What is the address of Marion WPC?

The address on the plant’s EPA facility record is 1810 Marion-Agosta Rd, Marion, OH 43302, in Marion County. Its coordinates are 40.5889, -83.1792. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Marion WPC treat?

Marion WPC treats an average of 7.91 MGD and is permitted for a design flow of 10.5 MGD.

What treatment technology does Marion WPC use?

Klarifi has identified 2 treatment structures and unit processes at the Marion facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

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

1810 Marion-Agosta Rd, Marion, OH 43302 · Marion County · Publicly Owned Treatment Works

Average flow: 7.91 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 7.91 million gallons per day against a permitted design capacity of 10.5 MGD, serving about 36,310 residents. It discharges under NPDES permit OH0026352 (effective), which expires in April 2030, with 14 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Marion WPC.

Available with a free Klarifi account

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

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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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Nearby wastewater treatment plants in Ohio

Harmony Subdiv Sd 5b

Marion · 4 mi away

0.02 MGD

Bumford Road WWTP Sd 6a

Marion · 4 mi away

0.0029 MGD

North Quarry Subdivision

Marion · 5 mi away

0.03 MGD

Fountain Place WWTP Sd 5a

Marion · 6 mi away

0.04 MGD

Sd No 7 Water Reclamation Plant

Marion · 6 mi away

1.07 MGD

Grandview Estates Sd 2a

Marion · 7 mi away

0.05 MGD

New Bloomington WWTP

New Bloomington · 7 mi away

0.03 MGD

Groves At Newmans Crossing POTW

Marion · 8 mi away

0.0042 MGD

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 October 26, 2026; facility record last updated August 19, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

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