Wilsonville Wastewater Treatment Plant Project
Clean Water for Tomorrow   

Wastewater Treatment Plant Dedication Event
Updated: March 28, 2014 

April 24, 2:00 to 3:00 pm
Wastewater Treatment Plant
9275 SW Tauchman Road
Wilsonville, Oregon 97070

The City’s $44 million dollar major expansion and upgrade to the Wastewater Treatment Plant (WWTP) is in the final stages of construction and will be dedicated at an event on Thursday, April 24, at 2 pm. The dedication event is free and open to the public; parking will be along Boones Ferry Road with a free shuttle service.

After a competitive bidding process, the City entered into a long-term contract with CH2M HILL to design, build and operate the plant for a 15-year period. With the design and build phases of the project nearly complete, the project is on time and under budget as it enters the final phase of construction.

The City Council found that having one firm undertake the entire process to design, build and operate the facility would reduce potential cost overruns, eliminate post-construction ‘finger-pointing’ over any problems found later, and result in a more efficient process and cost-effective operation.

The plant has been rebuilt and upgraded to include modern wastewater treatment technology, a new odor control system and increased capacity from 2.5 million gallons a day to 4 million gallons a day to accommodate Wilsonville’s continued growth. The facility’s effluent discharged to the Willamette River will be both cooler and cleaner, providing environmental benefits for aquatic life and downstream water users.

For more information about the event, contact Angela Handran, Executive Assistant, at 503-570-1503, Handran@ci.wilsonville.or.us; for information about the WWTP project, contact Eric Mende, PE, Capital Projects Engineering Manager, at 503-570-1538, mende@ci.wilsonville.or.us.

Click on the following series of articles for an overview of the Wastewater Treatment Plant and individual unit processes.

Improving the WWTP

Liquid Treatment Process


Odor Control

Biosolids Processing

Filtration and Disinfection

Fact Sheet

Project Performance Report August 2013