Portage Catawba Island WWTP
Port Clinton, OH · Ottawa County · Publicly Owned Treatment Works
- Average flow
- 0.45 MGD
- Design flow
- 0.68 MGD
- NPDES permit
- OH0095435
- Effective
- Permit expires
- March 2031
- Population served
- 250
- CWNS 2022
Portage Catawba Island WWTP is a publicly owned wastewater treatment works in Port Clinton, Ottawa County, Ohio treating an average of 0.45 million gallons per day against a permitted design capacity of 0.68 MGD, serving about 250 residents. It discharges under NPDES permit OH0095435 (effective), which expires in March 2031, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Portage Catawba Island WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Ohio
Port Clinton · 2 mi away
0.76 MGD
Port Clinton · 5 mi away
1.15 MGD
Put In Bay · 8 mi away
0.12 MGD
Put-In- Bay · 8 mi away
0.003 MGD
Sandusky · 9 mi away
7.47 MGD
Kelleys Island · 9 mi away
0.002 MGD
Oak Harbor · 13 mi away
0.0061 MGD
Bellevue · 14 mi away
0.000069 MGD
Portage Catawba Island 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 29, 2025.