What is the address of Coldwater WWTP?

The address on the plant’s EPA facility record is 605 Bell Road, Coldwater, OH 45828, in Mercer County. Its coordinates are 40.4924, -84.6209. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Coldwater WWTP treat?

Coldwater WWTP treats an average of 1.13 MGD and is permitted for a design flow of 0.9 MGD.

What treatment technology does Coldwater WWTP use?

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

What is the NPDES permit for Coldwater WWTP?

The facility discharges under NPDES permit OH0024694, currently effective, expiring January 2030.

Is Coldwater WWTP in compliance?

Discharge monitoring reports show 55 violations at Coldwater WWTP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Coldwater WWTP and how do I contact them?

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

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Coldwater WWTP

605 Bell Road, Coldwater, OH 45828 · Mercer County · Publicly Owned Treatment Works

Average flow: 1.13 MGD

Design flow: 0.9 MGD

NPDES permit: OH0024694; Effective

Permit expires: January 2030

Population served: 4,774; CWNS 2022

Coldwater WWTP is a publicly owned wastewater treatment works in Coldwater, Mercer County, Ohio treating an average of 1.13 million gallons per day against a permitted design capacity of 0.9 MGD, serving about 4,774 residents. It discharges under NPDES permit OH0024694 (effective), which expires in January 2030, with 55 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Coldwater WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 55

Effluent violations: 1

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

Key contacts

Decision-makers at Coldwater WWTP.

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Nearby wastewater treatment plants in Ohio

Philothea Sd WWTP

Celina · 3 mi away

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West Jefferson WWTP

Celina · 3 mi away

0.05 MGD

Celina WWTP

Celina · 4 mi away

2.01 MGD

Montezuma Club Island WWTP

Celina · 4 mi away

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Saint Henry WWTP

St Henry · 4 mi away

1.79 MGD

Chickasaw WWTP

Chickasaw · 9 mi away

0.71 MGD

Fort Recovery WWTP

Ft Recovery · 9 mi away

0.14 MGD

Odot Rest Area 7-33

St. Marys · 12 mi away

0.0017 MGD

Coldwater 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 April 24, 2025.

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

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