JWC Water Treatment Plant Expansion Project

Increasing Water Capacity, Strengthening Water Infrastructure & Ensuring Clean, Reliable Drinking Water for Customers

In response to the need to provide additional water for growing communities in western Washington County, the Joint Water Commission (JWC) —owned in partnership by the Cities of Hillsboro, Beaverton, Forest Grove and the Tualatin Valley Water District — are working to complete a multi-year water treatment expansion, improvements project, and facility plan for the JWC Water Treatment Plant.

The project, a result of nearly four years of water supply planning, addresses long-term water capacity and strengthens seismic resiliency while bringing the capacity of the plant from 75- to 85-million gallons (of water) per day (mgd) by 2019.

In addition to new and enhanced water treatment capabilities increasing the plant’s treatment capacity and reliability, the project also involves strengthening water infrastructure and planning for a future plant capacity of 105-mgd. A facility plan has been developed to lay the groundwork for the immediate plant expansion as well as phased seismic improvements and expansions until ultimate plant build out.

The JWC currently treats, transmits and stores drinking water for more than 365,000 customers, and is the largest conventional water treatment plant in Oregon.

For additional information on how the project will help provide safe and cost-effective drinking water to the water service partners for current and future needs, contact City of Hillsboro Project Manager Erika Murphy at 503-615-6720 or by e-mail.

Project Details

  • Project Status: Currently under construction
  • Completion: 2019
  • Total Project Value: $35 million
  • Delivery Method: CM/GC
  • Project Manager: Erika Murphy, City of Hillsboro
  • Contractors: Jacobs (formerly CH2M) and Slayden Constructors

May 2019 Project Updates

  • May JWC WTP UpdateInstallation of 36” washwater pipes are ongoing. These lines convey water recovered from the filter backwash process to our surge basin so the water can ultimately be recycled back to the start of the treatment process.
  • Installation of four new raw water pumps at the Tualatin River intake facility (Spring Hill Pump Station) is complete. The new 400HP raw water pumps will allow the treatment plant to produce 85MGD.
  • Filter structure concrete slab and wall pours are ongoing and will continue until June.
  • Filter structure mechanical piping installation is ongoing. Mechanical piping is necessary to collect filtered water and to backwash the filters.
  • Backfill around surge basin and new filter structure is ongoing.

Additional Resources

  • Joint Water Commission Water Treatment Plant Expansion to 85 MGD – Package 2 – GMP Submittal: The GMP is available for review at the partner agencies: Cities of HillsboroForest GroveBeaverton and the Tualatin Valley Water District (TVWD). For questions, contact Tacy Steele at 503-615-6732.