What is the address of Celina WWTP?

The address on the plant’s EPA facility record is 1125 South Elm Street, Celina, OH 45822, in Mercer County. Its coordinates are 40.5359, -84.5787. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Celina WWTP treat?

Celina WWTP treats an average of 2.01 MGD and is permitted for a design flow of 3 MGD.

What treatment technology does Celina WWTP use?

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

What is the NPDES permit for Celina WWTP?

The facility discharges under NPDES permit OH0020320, currently effective, expiring March 2028.

Is Celina WWTP in compliance?

Discharge monitoring reports show 5 violations at Celina WWTP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Celina WWTP and how do I contact them?

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

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Celina WWTP

1125 South Elm Street, Celina, OH 45822 · Mercer County · Publicly Owned Treatment Works

Average flow: 2.01 MGD

Design flow: 3 MGD

NPDES permit: OH0020320; Effective

Permit expires: March 2028

Population served: 12,776; CWNS 2022

Celina WWTP is a publicly owned wastewater treatment works in Celina, Mercer County, Ohio treating an average of 2.01 million gallons per day against a permitted design capacity of 3 MGD, serving about 12,776 residents. It discharges under NPDES permit OH0020320 (effective), which expires in March 2028, with 5 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Celina WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 5

Effluent violations: 5

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

Key contacts

Decision-makers at Celina WWTP.

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Nearby wastewater treatment plants in Ohio

Coldwater WWTP

Coldwater · 4 mi away

1.13 MGD

West Jefferson WWTP

Celina · 4 mi away

0.05 MGD

Montezuma Club Island WWTP

Celina · 4 mi away

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Philothea Sd WWTP

Celina · 7 mi away

—

Saint Henry WWTP

St Henry · 8 mi away

1.79 MGD

Odot Rest Area 7-33

St. Marys · 8 mi away

0.0017 MGD

Chickasaw WWTP

Chickasaw · 9 mi away

0.71 MGD

St Marys City WWTP

Saint Marys · 10 mi away

1.66 MGD

Celina WWTP: 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 September 13, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms

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