City Of Seneca
West Seneca, OK · Ottawa County · Publicly Owned Treatment Works
- Average flow
- 0.32 MGD
- Design flow
- 0.9 MGD
- NPDES permit
- OK0030236
- Effective
- Permit expires
- January 2029
- Population served
- 8,124
- CWNS 2022
City Of Seneca is a publicly owned wastewater treatment plant in West Seneca, Ottawa County, Oklahoma treating an average of 0.32 million gallons per day against a permitted design capacity of 0.9 MGD, serving about 8,124 residents. Treatment on site includes uncovered lagoons, biogas silos, biological treatment, other, biosolids aerobic digestion, disinfection, uv. It discharges under NPDES permit OK0030236 (effective), which expires in January 2029, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Biogas silos
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Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processDisinfection, UV
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Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at City Of Seneca.
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Commerce · 15 mi away
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City Of Seneca: 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 9, 2026.