What is the address of Ada WWTP?

The address on the plant’s EPA facility record is 3623 County Road 44, Ada, OH 45810, in Hardin County. Its coordinates are 40.7713, -83.8114. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Ada WWTP treat?

Ada WWTP treats an average of 0.77 MGD and is permitted for a design flow of 2 MGD.

What treatment technology does Ada WWTP use?

Klarifi has identified 3 treatment structures and unit processes at the Ada facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Ada WWTP?

The facility discharges under NPDES permit OH0020583, currently effective, expiring February 2028.

Is Ada WWTP in compliance?

Discharge monitoring reports show 8 violations at Ada WWTP in the last three years, 8 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Ada WWTP and how do I contact them?

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

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Ada WWTP

3623 County Road 44, Ada, OH 45810 · Hardin County · Publicly Owned Treatment Works

Average flow: 0.77 MGD

Design flow: 2 MGD

NPDES permit: OH0020583; Effective

Permit expires: February 2028

Population served: 5,334; CWNS 2022

Ada WWTP is a publicly owned wastewater treatment works in Ada, Hardin County, Ohio treating an average of 0.77 million gallons per day against a permitted design capacity of 2 MGD, serving about 5,334 residents. It discharges under NPDES permit OH0020583 (effective), which expires in February 2028, with 8 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Ada WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 8

Effluent violations: 8

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

Key contacts

1 verified contact for Ada WWTP, with validated emails and direct phone numbers.

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

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Alger WWTP

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0.05 MGD

Mcguffey STP

Mcguffey · 6 mi away

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Harrod WWTP

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Lafayette WWTP

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Dunkirk WWTP

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Ada 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 August 16, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms

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