Clatskanie WWTP
Clatskanie, OR · Columbia County · Publicly Owned Treatment Works
- Average flow
- 0.15 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- OR0020231
- Administratively continued
- Permit expires
- June 2017
- Population served
- 1,780
- CWNS 2022
Clatskanie WWTP is a publicly owned wastewater treatment works in Clatskanie, Columbia County, Oregon treating an average of 0.15 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 1,780 residents. Treatment on site includes clarifiers. It discharges under NPDES permit OR0020231 (administratively continued), which expires in June 2017, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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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 Clatskanie WWTP.
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Nearby wastewater treatment plants in Oregon
Clatskanie · 8 mi away
0.01 MGD
Rainier · 13 mi away
0.16 MGD
Vernonia · 17 mi away
0.1 MGD
Astoria · 28 mi away
1.75 MGD
Scappoose · 30 mi away
0.67 MGD
Warrenton · 34 mi away
0.76 MGD
Seaside · 35 mi away
1.2 MGD
Cannon Beach · 39 mi away
0.32 MGD
Clatskanie 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 27, 2025.