Sekiu STP
Sekiu, WA · Clallam County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WAG994584
- Terminated
- Permit expires
- December 2026
- Population served
- 616
- CWNS 2022
Sekiu STP is a publicly owned wastewater treatment works in Sekiu, Clallam County, Washington, serving about 616 residents. Treatment on site includes clarifiers. It discharges under NPDES permit WAG994584 (terminated), which expires in December 2026, with 10 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
- 10
- Effluent violations
- 10
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Sekiu STP.
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Nearby wastewater treatment plants in Washington
Clallam Bay · 1 mi away
—
Forks · 38 mi away
0.04 MGD
Port Angeles · 43 mi away
—
Sequim · 58 mi away
—
Lopez Island · 66 mi away
—
Moclips · 70 mi away
0.01 MGD
Port Townsend · 70 mi away
—
Pacific Beach · 73 mi away
0.09 MGD
Sekiu 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 November 8, 2025.