Wastewater Treatment Plant Master Plan

The City of Wilsonville is updating its Wastewater Treatment Plant Master Plan.

The improvements detailed in this Plan are designed to provide optimal value to the City’s ratepayers by maximizing the use of existing infrastructure and improving system operation while continuing to protect water quality and human health and supporting economic development, consistent with goals and policies contained in the 2018 Comprehensive Plan and 2021-2023 City Council Goals.

The City’s WWTP, located at 9275 Southwest Tauchman Rd., was originally built in 1971. A major 2014 upgrade expanded the average dry weather capacity to four million gallons per day (mgd) to accommodate population growth. The City contracts with Jacobs for daily operation of the WWTP. WWTP processes include headworks screening and grit removal facilities, aeration basins, stabilization basins, secondary clarifiers, biosolids processing, cloth filtration, and disinfection processes. Treated effluent is discharged into the Willamette River.

This Plan, which satisfies requirements established by the State of Oregon Department of Environmental Quality (DEQ), considers:

• The age and condition of existing process equipment and structures
• Growth to accommodate population growth and new economic development over the planning period (through 2045). Projections are based on projections, WWTP historical data and DEQ wet weather project methodologies.
• Potential changes to water quality regulations established by the DEQ.
• City of Wilsonville Wastewater Collection System Master Plan (2014, MSA), and
• Consistency with the 2018 Comprehensive Plan and City Council 2021-2023 Goals 5, 6 and 7:
  1. Goal 5: Align infrastructure plans with sustainable financing sources.
  2. Goal 6: Engage the community to support emergency preparedness and resiliency.
  3. Goal 7: Protect Wilsonville's environment and increase access to sustainable lifestyle choices.

To view the plan, see the "documents" box on this page.