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Project schedule still taking shape for treatment plan buildouts and additional construction

After months of planning and negotiations, the Wilsonville Water Treatment Plant 2015 Master Plan Update has been completed.

The 2015 Master Plan Update is a joint project between the Tualatin Valley Water District (TVWD) and the Cities of Wilsonville, Hillsboro, Sherwood, Beaverton, and Tigard covering the future water facility needs of Wilsonville and the Willamette Water Supply Program that will service the TVWD. Although the master plan concerns the Wilsonville Water Treatment Plant, Wilsonville won't be receiving benefit from most of the projects within the master plan and the project partners are expected to share the bulk of the capital costs.

The plan details the anticipated future water demands from the plant for its six partners, the level of service to be expected from the plant — including water quality goals, operational strategy, available technologies and seismic-resilience analysis — and the implementation plan, including tentative costs and schedule.

Wilsonville Capital Projects Engineering Manager Eric Mende presented the completed plan at the March 6 City Council work session. During his presentation, Mende outlined the planned facility build-out of an additional water treatment site, called the upper site, that is anticipated to produce 100 million gallons of water per day. The plan also included the concept work for an expansion of the existing lower site — built in 2002 — to be able to produce 60 million gallons per day — which is four times the lower site's current capacity to produce 15 million gallons per day.

With the completion of the 2015 Master Plan, Mende has already moved on to the creation of the 2017 Master


"I also have a 2017 Master Plan that I'm kicking off," Mende said. "I'm calling it a 'Mini Master Plan' and it will focus directly on the lower plant, existing facility."

The 2017 plan addresses repairs, replacements of parts and future upgrades as technology develops further. Mende hopes to have the plan approved and adopted during fall of 2017.

City staff and partners will continue to conduct monthly meetings to monitor project progress. A solidified budget and schedule of projects has yet to be finalized.

The next noticeable portion of the project that will impact Wilsonville residents won't come until late 2017 or early 2018.

Contact Wilsonville Spokesman reporter Claire Green at 503-636-1281 ext. 113 or This email address is being protected from spambots. You need JavaScript enabled to view it..

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