Miller Creek WWTP And Compost Facility
1015 SW 174th St, Seattle, WA 98166 · King County · Publicly Owned Treatment Works
- Average flow
- 3.6 MGD
- Design flow
- —
- NPDES permit
- WA0022764
- Administratively continued
- Permit expires
- September 2023
- Population served
- 28,342
- CWNS 2022
Miller Creek WWTP And Compost Facility is a publicly owned wastewater treatment works in Seattle, King County, Washington treating an average of 3.6 million gallons per day, serving about 28,342 residents. It discharges under NPDES permit WA0022764 (administratively continued), which expires in September 2023, with 0 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Miller Creek WWTP And Compost Facility.
Available with a free Klarifi account
See the full treatment train at Miller Creek WWTP And Compost Facility: structures, unit processes and planned upgrades, with exact unit counts.
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 Miller Creek WWTP And Compost Facility.
No verified contacts on file yet
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Nearby wastewater treatment plants in Washington
Seattle · 3 mi away
3.03 MGD
Renton · 5 mi away
74.4 MGD
Federal Way · 8 mi away
4.96 MGD
Port Orchard · 12 mi away
0.22 MGD
Port Orchard · 14 mi away
1.98 MGD
Bainbridge Island · 14 mi away
0.63 MGD
Seattle · 15 mi away
106.93 MGD
Puyallup · 17 mi away
5.2 MGD
Miller Creek WWTP And Compost Facility: 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 19, 2026; facility record last updated July 3, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms