Washougal STP
Washougal, WA · Clark County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0037427
- Administratively continued
- Permit expires
- November 2016
- Population served
- 16,266
- CWNS 2022
Washougal STP is a publicly owned wastewater treatment works in Washougal, Clark County, Washington, serving about 16,266 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit WA0037427 (administratively continued), which expires in November 2016, with 0 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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Aerated lagoons
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Washougal STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Washougal STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Camas · 3 mi away
2.62 MGD
Yacolt · 11 mi away
—
North Bonneville · 18 mi away
0.06 MGD
Stevenson · 23 mi away
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Vancouver · 23 mi away
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Ridgefield · 27 mi away
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Bingen · 43 mi away
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Longview · 47 mi away
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Washougal 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 July 3, 2025.