Portland’s Bull Run water filtration project rises to $2.56 billion as schedule extends beyond 2027
Cost update and revised timetable
Portland’s long-planned Bull Run Filtration Project now carries an updated total cost estimate of $2.56 billion, reflecting higher construction expenses and schedule extensions tied to delays in land-use proceedings. The filtration facility and related pipelines are being built to treat Bull Run water and strengthen regional drinking-water reliability for customers served by the Portland Water Bureau and its wholesale partners.
The project’s compliance deadline remains September 30, 2027, when treated water must meet surface water and Cryptosporidium treatment requirements under state and federal drinking-water regulations. However, project materials describe construction continuing through 2028, indicating substantial completion and full operational readiness may extend beyond earlier expectations.
Why Portland is building a filtration plant now
The Bull Run Treatment Program includes a new filtration facility designed to treat up to 135 million gallons per day and new seismically resilient pipelines connecting the plant to Portland’s existing system. The broader treatment program also includes improved corrosion control, a separate facility completed in April 2022, intended to reduce the potential for lead leaching from some household plumbing.
Filtration is intended to remove Cryptosporidium and other potential contaminants, as well as reduce sediment and organic material that can affect water quality. Project descriptions also emphasize resilience benefits tied to wildfires, extreme storms, and seismic risk, with new infrastructure built to more modern standards.
Land-use dispute and construction interruptions
The project timeline has been affected by legal and administrative reviews of land-use permits in East Multnomah County. Construction was temporarily paused from February through June 2025 after a state land-use decision required additional review of an issue related to “natural resources.” Multnomah County later reapproved the permits, allowing work to restart.
Construction activity in early 2026 has included completed major excavation, ongoing concrete work, and installation of more than 7,000 feet of new pipeline.
City materials also anticipate the possibility of additional appeals, which could add time and cost.
What is driving the higher price tag
The updated $2.56 billion estimate reflects several pressures that have accumulated since the project was first approved in 2017, when early cost projections were substantially lower. Project updates attribute the latest increase to schedule extensions and delays linked to the land-use process, as well as rapid increases in construction labor and material costs that outpaced general inflation. The revised budget also includes funding intended to manage risk and maintain project oversight through completion.
How the project is financed and what comes next
The Bull Run Treatment Program is primarily funded through customer water rates, supported by long-term borrowing. Portland has also used federal low-interest financing through the Water Infrastructure Finance and Innovation Act (WIFIA) to reduce borrowing costs over time and smooth rate impacts. The city has signaled that additional water and sewer rate adjustments may be proposed as part of the 2026–27 budget cycle to support the filtration facility and pipeline work.
- Updated total cost estimate: $2.56 billion
- Regulatory compliance deadline: September 30, 2027
- Construction period described in project materials: 2024–2028
With major sitework underway, the next phase focuses on bringing the treatment facility above ground and advancing pipeline connections needed to integrate the new plant into the regional water system.