Willamette Water Supply Water Treatment Plant 1.0

  • Location:

    Sherwood, Oregon

  • Client:

    Willamette Water Supply Program

  • Construction Value:

    Net $420 million

  • Delivery Method:

    CM/GC (CMAR)

  • Year Completed:

    In progress

  • Specialties:

    Water & Wastewater

Features & Highlights

  • Capable of treating 60 million gallons per day with the ability for future expansion to 120 million gallons per day.
  • The emergency facility will be able to provide drinking water for the community within 48 hours of a seismic event.
Project Overview

Acting as contractor, Sundt began work on the seismically resilient Willamette Water Treatment Plant in April 2022 and is slated to complete construction in 2026. The treatment plant sits on 30 acres in Sherwood, Oregon and will include roadway improvements, a 66,400-square-foot administrations and operations building, a pump station, and a 10-million-gallon, pre-stressed, concrete water tank.

As an added challenge, the water treatment plant is close to the Cascadia subduction zone, which is an active fault line off the Pacific Coast shoreline between northern California and British Columbia; it is known for producing the largest earthquakes in the world. The seismic design requirements are extensive and above the industry norm. Sundt carefully evaluated team members who understood these crucial requirements and brought on vendors and subcontractors early in the process to secure materials and equipment. The emergency facility will be able to provide drinking water for the community within 48 hours of a seismic event.

Once completed, the plant will have the capability to treat up to 120 million gallons of water per day, utilizing multiple steps to meet drinking water standards. These steps include enhanced coagulation sedimentation, ballasted flocculation, ozonation, ultraviolet light, granulated activated carbon and sand filtration and chlorine disinfection.

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