Ada WWTP
Ada, OH · Hardin County · Publicly Owned Treatment Works
- Average flow
- 0.49 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 0.49 million gallons per day against a permitted design capacity of 2 MGD, serving about 5,334 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit OH0020583 (effective), which expires in February 2028, with 8 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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
Decision-makers at Ada WWTP.
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Nearby wastewater treatment plants in Ohio
Harrod · 5 mi away
0.000025 MGD
Alger · 5 mi away
0.03 MGD
Mcguffey · 6 mi away
0.03 MGD
Harrod · 7 mi away
0.01 MGD
Lafayette · 7 mi away
0.02 MGD
Dola · 8 mi away
0.0012 MGD
Elida · 9 mi away
0.0062 MGD
Dunkirk · 9 mi away
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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 September 11, 2026; facility record last updated August 16, 2026.