What is the address of Caldwell WWTP?

The address on the plant’s EPA facility record is Railroad St, Caldwell, OH 43724, in Noble County. Its coordinates are 39.7441, -81.5218. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Caldwell WWTP treat?

Caldwell WWTP treats an average of 0.73 MGD and is permitted for a design flow of 0.8 MGD.

What treatment technology does Caldwell WWTP use?

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

What is the NPDES permit for Caldwell WWTP?

The facility discharges under NPDES permit OH0020559, currently effective, expiring February 2029.

Is Caldwell WWTP in compliance?

Discharge monitoring reports show 13 violations at Caldwell WWTP in the last three years, 13 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Caldwell WWTP and how do I contact them?

Caldwell WWTP is a publicly owned treatment works in Caldwell, Ohio. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Caldwell WWTP

Railroad St, Caldwell, OH 43724 · Noble County · Publicly Owned Treatment Works

Average flow: 0.73 MGD

Design flow: 0.8 MGD

NPDES permit: OH0020559; Effective

Permit expires: February 2029

Population served: 2,618; CWNS 2022

Caldwell WWTP is a publicly owned wastewater treatment works in Caldwell, Noble County, Ohio treating an average of 0.73 million gallons per day against a permitted design capacity of 0.8 MGD, serving about 2,618 residents. It discharges under NPDES permit OH0020559 (effective), which expires in February 2029, with 13 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Caldwell WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 13

Effluent violations: 13

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

Key contacts

2 verified contacts for Caldwell WWTP, with validated emails and direct phone numbers.

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

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Senecaville WWTP

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Beverly WWTP

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Lowell WWTP

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Mcconnelsvilles State Route 78 Package Sewer Plt

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Caldwell 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 30, 2025.

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

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