Oak Harbor WWTP
Oak Harbor, OH · Ottawa County · Publicly Owned Treatment Works
- Average flow
- 0.42 MGD
- Design flow
- 0.93 MGD
- NPDES permit
- OH0026841
- Effective
- Permit expires
- December 2028
- Population served
- 4,129
- CWNS 2022
Oak Harbor WWTP is a publicly owned wastewater treatment works in Oak Harbor, Ottawa County, Ohio treating an average of 0.42 million gallons per day against a permitted design capacity of 0.93 MGD, serving about 4,129 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit OH0026841 (effective), which expires in December 2028, with 121 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
- 121
- Effluent violations
- 83
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Oak Harbor WWTP.
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Nearby wastewater treatment plants in Ohio
Oak Harbor · 1 mi away
0.0066 MGD
Oak Harbor · 6 mi away
0.0061 MGD
Lindsey · 7 mi away
0.02 MGD
Elmore · 8 mi away
0.07 MGD
Port Clinton · 10 mi away
1.15 MGD
Fremont · 10 mi away
4.02 MGD
Genoa · 11 mi away
0.24 MGD
Woodville · 11 mi away
0.13 MGD
Oak Harbor 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 November 15, 2025.