Mcguffey STP
Mcguffey, OH · Hardin County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- Design flow
- 0.12 MGD
- NPDES permit
- OH0026271
- Effective
- Permit expires
- November 2027
- Population served
- 466
- CWNS 2022
Mcguffey STP is a publicly owned wastewater treatment works in Mcguffey, Hardin County, Ohio treating an average of 0.03 million gallons per day against a permitted design capacity of 0.12 MGD, serving about 466 residents. Treatment on site includes carrousels / oxidation ditches. It discharges under NPDES permit OH0026271 (effective), which expires in November 2027, with 156 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 156
- Effluent violations
- 84
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mcguffey STP.
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Nearby wastewater treatment plants in Ohio
Alger · 4 mi away
0.03 MGD
Ada · 6 mi away
0.49 MGD
Harrod · 7 mi away
0.000025 MGD
Harrod · 7 mi away
0.01 MGD
Belle Center · 9 mi away
0.0025 MGD
Dola · 9 mi away
0.0012 MGD
Kenton · 10 mi away
0.001 MGD
Dunkirk · 10 mi away
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Mcguffey STP: 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 November 15, 2025.