Salmon Creek WWTP
Seattle, WA · King County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WAG994551
- Terminated
- Permit expires
- December 2026
- Population served
- 31,051
- CWNS 2022
Salmon Creek WWTP is a publicly owned wastewater treatment works in Seattle, King County, Washington, serving about 31,051 residents. Treatment on site includes biogas silos. It discharges under NPDES permit WAG994551 (terminated), which expires in December 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biogas silos
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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.
Capital improvement projects in Seattle
Seattle's capital improvement plan lists 70 water, sewer and wastewater line items worth $3.0B starting 2025–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Seattle →
| Project | Budget | Years |
|---|---|---|
| Ship Canal Water Quality Project | $240,266,000 | 2025–2028 |
| Watermain Rehabilitation | $209,855,000 | 2025–2030 |
| Pipe Renewal Program | $197,287,000 | 2025–2030 |
| Combined Sewer Overflows | $184,249,807 | 2025–2026 |
| Shared Cost Projects | $175,858,916 | 2025–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Salmon Creek WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Washington
Renton · 6 mi away
—
Port Orchard · 10 mi away
—
Bainbridge Island · 12 mi away
—
Seattle · 12 mi away
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Port Orchard · 12 mi away
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Suquamish · 19 mi away
0.16 MGD
Kingston · 22 mi away
—
University Place · 23 mi away
17.07 MGD
Salmon Creek WWTP: 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 September 5, 2025.