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Brightwater Treatment Plant

Brightwater Aerial---large

Brightwater Treatment Plant, Woodinville, WA

The heart of the plant is the split-flow liquids treatment process, incorporating chemically enhanced primary clarification ahead of the largest membrane bioreactor (MBR) in North America.


This state-of-the-art wastewater treatment and reclamation facility forms the hub of King County’s Brightwater Regional Wastewater System, interfacing with a complex conveyance system, reclaimed water distribution system, and marine outfall. With its broad-reaching public amenities, the Brightwater Treatment Plant redefines how the public views a municipal wastewater treatment plant.


  • First plant in North America to combine chemically enhanced primary clarification with MBRs for a unique split-flow treatment system, resulting in 70% improvement in effluent quality over traditional secondary treatment.
  • The advanced odor control system provides an unparalleled 99.97% removal efficiency of hydrogen sulfide, resulting in no detectable odor at the property line.
  • One of the largest wastewater treatment plants designed for unattended operation when necessary.
  • The Brightwater Center is a LEED platinum-designed venue for environmental education and public events, developed in cooperation with a local teacher’s task force.


  • Project Entrant: CH2M HILL/Brown and Caldwell
  • Project Owner: King County Department of Natural Resources and Parks, Wastewater Treatment Division
  • Contractors: Hoffman Construction Company and Kiewit Infrastructure

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