Sekiu STP
176 Front St, Sekiu, WA 98381 · Clallam County · Publicly Owned Treatment Works
- Average flow
- 0.07 MGD
- 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 treating an average of 0.07 million gallons per day, serving about 616 residents. It discharges under NPDES permit WAG994584 (terminated), which expires in December 2026, with 10 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Sekiu STP.
Available with a free Klarifi account
See the full treatment train at Sekiu STP: structures, unit processes and planned upgrades, with exact unit counts.
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
0.09 MGD
Clallam Bay · 2 mi away
0.04 MGD
Forks · 38 mi away
0.13 MGD
Port Angeles · 43 mi away
2.72 MGD
Sequim · 58 mi away
0.64 MGD
Friday Harbor · 62 mi away
0.4 MGD
Lopez Island · 66 mi away
0.02 MGD
Orcas · 66 mi away
0.0063 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 October 26, 2026; facility record last updated November 8, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms