​​Portland water treatment plant costs climb past .5 billion, project completion faces 2-year delay

​​Portland water treatment plant costs climb past $2.5 billion, project completion faces 2-year delay

February 20, 2026 discoverhiddenusacom Health

The cost to provide safe drinking water for nearly one million residents in the Portland, Oregon, metropolitan area is escalating dramatically. Officials announced Thursday that the price tag for the Bull Run water filtration plant has increased by an additional $450 million, bringing the total project cost to over $2.5 billion. This represents a five-fold increase from the initial $500 million plan approved in 2017.

A Project Delayed and Growing in Cost

The Bull Run plant, intended to comply with federal and state safe drinking water regulations, has been under development for eight years, with construction beginning two years ago. The latest cost increase, adjusted for inflation, is attributed to paused construction due to legal appeals, increased contracting costs, permitting expenses, and rising labour and material prices, according to Ting Lu, Portland’s director of public utilities.

Did You Know? The Bull Run watershed provides water for approximately 1 million people, including residents of Portland, Gresham, and Sandy, through contracts with 19 area water providers.

The Need for Filtration

The federal government requires the city to build the plant on 95 acres of city-owned property south of Oxbow Regional Park. Currently, the Portland Water Bureau does not treat for cryptosporidium, a parasite that can cause diarrhea and more severe illness in individuals with weakened immune systems. The U.S. Environmental Protection Agency and the Oregon Health Authority determined in 2017 that treatment was necessary due to the increasing presence of cryptosporidium in the city’s water samples – a common challenge for systems using surface water sources.

Expert Insight: The significant cost overruns and delays highlight the complexities of large-scale infrastructure projects, particularly those subject to environmental regulations and community opposition. Ensuring safe drinking water is a fundamental public health responsibility, but balancing that with cost containment and community concerns presents ongoing challenges.

What’s Next for the Project?

The city has requested a 24-month extension from the Oregon Health Authority for providing filtered water, largely due to construction delays. This would shift the compliance deadline from 2027 to 2029. While the Oregon Land Use Board of Appeals recently affirmed the project’s permits, opponents could still appeal to the Oregon Court of Appeals. The City Council will review the Water Bureau’s budget, including the Bull Run project, in the coming weeks. Officials have indicated that covering the additional costs will likely involve a combination of customer rate increases, federal loans, and long-term bonds.

Frequently Asked Questions

What is cryptosporidium?

Cryptosporidium is a parasite that can cause diarrhea and more severe symptoms for people with weakened immune systems.

Why is the Bull Run plant needed?

The federal government requires the city to treat its water because cryptosporidium has been detected too often in Portland’s water samples.

How will the project be funded?

The City Council will determine how to cover the additional costs, likely through a combination of customer rate increases, federal loans, and long-term bonds.

As Portland navigates these challenges, how might similar infrastructure projects in other communities balance public health needs with financial realities and community concerns?