Portland's $2.1 Billion Bull Run Filtration Plant Wins Key Court Battle
Oregon's land use board affirms the project can proceed, but residents won't see filtered water until at least late 2027.
Portland's yearslong fight to build a water filtration plant just cleared its biggest remaining obstacle. On Thursday, Oregon's Land Use Board of Appeals affirmed that the city's 95-acre Bull Run filtration facility complies with state land use laws - a ruling that should allow construction to continue without further legal interruption.
What Happened
The $2.1 billion project has been mired in legal challenges since 2023, when nearby landowners and conservation groups - including 1000 Friends of Oregon - argued the massive facility would diminish farmable land in rural Multnomah County. Construction was halted for four months in early 2025 after LUBA sent the land use permit back to the county for review.
A Multnomah County hearings officer reapproved the project last year, and opponents appealed again. Friday's LUBA ruling affirming the county's decision marks a significant - and likely final - victory for the Portland Water Bureau.
Why Portland Needs This Plant
Portland is one of the last major U.S. cities to rely on unfiltered surface water. The city's drinking water comes from the Bull Run Watershed, a protected area of the Mount Hood National Forest. The water is famously clean-tasting, but it has a problem: cryptosporidium, a microscopic parasite that causes diarrhea, likely from wildlife in the watershed.
Portland has repeatedly exceeded federal cryptosporidium limits set by the EPA. The filtration plant will also protect against degraded water quality from wildfires - a growing concern after the 2023 Camp Creek Fire came within miles of the watershed.
The Timeline
The city faces a September 30, 2027 deadline to begin serving filtered water. It's unclear whether the legal delays have pushed the project past that date. City officials say they'll share more details in a press conference next week. Missing the deadline could result in federal fines.
What This Means for Portland Residents
Until the filtration plant is operational, Portland's water continues to be treated with chlorine and UV light but not filtered. The water remains legally safe to drink, but residents concerned about cryptosporidium, sediment, or wildfire-related contaminants have options.
Portland's tap water is already quite soft (around 15 PPM hardness) and scores well on most metrics. The main concerns are microbial - which is exactly what the filtration plant is designed to address.
What Portland Residents Are Using Now
While waiting for citywide filtration, many Portland households are filtering at the tap:
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The Bigger Picture
Portland's situation highlights a nationwide tension: aging water infrastructure versus the cost and complexity of upgrades. The Bull Run project's $2.1 billion price tag makes it one of the largest municipal water investments in the country. The EPA's WIFIA loan program is helping fund the project, saving Portland an estimated $247.5 million in financing costs.
For residents of other cities watching their own infrastructure debates, Portland's experience offers a lesson: these projects take years of planning, legal challenges, and billions of dollars - but they're essential for long-term water safety.