Trustees Advance Columbia Falls Pollution Damage Probe
Montana's Natural Resource Damage Program updates its assessment of contamination tied to the Columbia Falls Aluminum Co. site.
Updated on Nov. 13, 2026 in Utilities
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Montana's Natural Resource Damage Program gave an update on its investigation of contamination at the Columbia Falls Aluminum Co. site. Reparations from past pollution at the plant would likely take years to reach settlement.
Why it matters
The assessment seeks to recover environmental damage from historic polluters that occurred before the 1981 Superfund law took effect, which excluded such losses. For Montana residents, the findings could shape who pays for cleanup and restoration of groundwater, soils and wildlife near Columbia Falls.
The trustees' damage assessment covers a 1,340-acre site, while a separate 76-acre former plant parcel has been approved for housing. Data on off-site soils and biota remains incomplete, and no reparation amount has been established.
The players
Columbia Falls Aluminum Co.
The aluminum company whose historic plant operations in Columbia Falls are under state damage assessment for environmental contamination.
Atlantic Richfield Co.
A major energy and mining company that is also named as a historic polluter in the Columbia Falls damage assessment.
The details
The trustees hold significant data on surface and groundwater impacts from the plant but need more information on off-site soils and biota. They sent a letter to the company earlier this year requesting data on plant fires and firefighting methods, and the Confederated Salish and Kootenai Tribes has a stake through the Hellgate Treaty.
Timeline
1981: Superfund law passed, excluding damage from polluters prior to that year.
2026: Company installed a new liner on the Cedar Dam overflow ditch.
Earlier in 2026: Trustees requested fire and foam data from the company.
Next spring (2027): Trustees hope to have a plan for examining biota impacts on the site.
2027: Slurry wall work around the old dumps could begin.
Market Landscape
The damage assessment operates under the 1981 federal Superfund law, which excluded damage caused by polluters before that year. Montana's effort to recover losses from historic polluters such as Columbia Falls Aluminum Co. and Atlantic Richfield Co. tests how far that framework reaches for legacy industrial contamination.
Residents near Columbia Falls could see cleanup work on groundwater and old dumps begin as early as 2027. Any reparations recovered from past polluters would likely take years to reach stakeholders.
The takeaway
Environmental damage from older industrial operations can outlast the companies that caused it, so the timing of data collection and cleanup planning matters for everyone affected. Residents concerned about local water should track the trustees' upcoming biota plan.
What happens next
The trustees hope to have a plan for examining biota impacts on the 1,340-acre site by next spring, and work on a slurry wall around the old dumps could start as soon as 2027.
Further reading
Explore more on Utilities coverage tied to environmental cleanup and water systems in Montana.
Source note: This article includes information reported by The Daily Inter Lake.
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Should companies that polluted decades ago be made to pay for the damage?
