Jefferson Wastewater Treatment Plant
Jefferson, OR · Marion County · Publicly Owned Treatment Works
- Average flow
- 0.17 MGD
- Design flow
- 0.54 MGD
- NPDES permit
- OR0020451
- Administratively continued
- Permit expires
- September 2016
- Population served
- 2,830
- CWNS 2022
Jefferson Wastewater Treatment Plant is a publicly owned wastewater treatment works in Jefferson, Marion County, Oregon treating an average of 0.17 million gallons per day against a permitted design capacity of 0.54 MGD, serving about 2,830 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit OR0020451 (administratively continued), which expires in September 2016, with 4 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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Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Jefferson Wastewater Treatment Plant.
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Aumsville · 11 mi away
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Independence · 13 mi away
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Tangent · 13 mi away
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Lebanon · 13 mi away
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Monmouth · 14 mi away
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Jefferson Wastewater Treatment Plant: 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 February 15, 2025.