Program Overview

The Tualatin Valley Water District (TVWD) and the City of Hillsboro are partnering on the Program to develop the mid-Willamette River at Wilsonville as an additional water supply source.

This new system, when operational in 2026, will provide a reliable water supply for the region by helping water system operators balance supply during times of drought or other supply interruptions, as well as recover more quickly after a large natural disaster. Planning for this important water project is underway and includes a new water filtration plant, more than 30 miles of water pipelines, and water storage tanks — all built to modern seismic standards.

The Program team is making great progress:

  • TVWD and City of Hillsboro secured $616.6 million in federal financing through the Water Infrastructure Finance and Innovation Act (WIFIA). This financing will lead to millions of dollars of savings for TVWD and City of Hillsboro ratepayers.
  • Construction on three sections of the pipeline (3.75 miles) is complete – 124th Avenue near Tualatin, Kinsman Road in Wilsonville and a segment of the South Hillsboro Pipeline Project under Cornelius Pass Road, south of TV Highway.
  • U.S. Army Corps of Engineers and Oregon Department of State Lands approved the Program’s environmental permits. Land use permitting is in progress for various elements of the Willamette Water Supply Program.

We appreciate the continued cooperation of all the WWSP pipeline and facility neighbors who have allowed access to their property for environmental and geologic studies. Limited access to private property bordering the pipeline route may be requested in the future by Program staff in order to finalize the pipeline design.

For those with property bordering water facilities, we will be in touch with you as our plans progress and if an easement on your property will be needed.

The pipeline route remains a work in progress and will continue to be refined as the design develops.

Program Map & Schedule

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Our Reliable Water

Efficient Regional Coordination

“We’re fortunate to have coordination among our regional water providers, like the Tualatin Valley Water District and the City of Hillsboro, to make sure we have a safe, resilient water supply as the region grows.” ----Councilor Kathryn Harrington, Metro Council District 4

Program Timeline

Developing the new Willamette water source will take over a decade.

Willamette Water Supply Program

Willamette Water Supply Program