JWC Water Treatment Plant Expansion Project

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, Forest Grove, Beaverton, and the Tualatin Valley Water District — completed a multi-year water treatment expansion, improvements project, and facility plan for the JWC Water Treatment Plant in 2020.

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

In addition to new and enhanced water treatment capabilities increasing the plant’s treatment capacity and reliability, the project also involved strengthening water infrastructure and planning for a future plant capacity of 105-mgd. A facility plan was 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 the City of Hillsboro at 503-615-6700 or by e-mail.

Project Details

  • Project Status: Complete
  • Year Completed: 2020
  • Total Project Value: $35 million
  • Delivery Method: CM/GC
  • Project Manager: City of Hillsboro
  • Contractors: Jacobs (formerly CH2M) and Slayden Constructors

Contact Us

  • Call 503-615-6702
  • Email JWC staff 
  • Visit 150 East Main Street, Third Floor, Hillsboro, Oregon 97123