Sedro Woolley City Of
Sedro-Woolley, WA · Skagit County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0023752
- Effective
- Permit expires
- December 2023
- Population served
- 8,268
- CWNS 2022
Sedro Woolley City Of is a publicly owned wastewater treatment plant in Sedro-Woolley, Skagit County, Washington, serving about 8,268 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit WA0023752 (effective), which expires in December 2023, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Sedro Woolley City Of.
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Nearby wastewater treatment plants in Washington
Burlington · 4 mi away
—
Mount Vernon · 7 mi away
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Mount Vernon · 14 mi away
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Stanwood · 19 mi away
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Bellingham · 27 mi away
0.07 MGD
Ferndale · 29 mi away
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Everson · 30 mi away
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Marysville · 31 mi away
0.17 MGD
Sedro Woolley City Of: 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 October 6, 2025.