Stevenson STP
Stevenson, WA · Skamania County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0020672
- Effective
- Permit expires
- September 2030
- Population served
- 1,717
- CWNS 2022
Stevenson STP is a publicly owned wastewater treatment works in Stevenson, Skamania County, Washington, serving about 1,717 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit WA0020672 (effective), which expires in September 2030, with 5 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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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 5
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Stevenson STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Stevenson STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
North Bonneville · 6 mi away
0.06 MGD
Bingen · 21 mi away
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Yacolt · 22 mi away
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Washougal · 23 mi away
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Camas · 25 mi away
2.62 MGD
Lyle · 29 mi away
0.03 MGD
Vancouver · 41 mi away
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Ridgefield · 42 mi away
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Stevenson STP: 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 May 29, 2025.