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Montana DEQ Denies Petition to Loosen Lake Koocanusa Selenium Standard

Peyton Olson| September 3, 2025| News

By Tristan Scott, Flathead Beacon

The Montana Department of Environmental Quality (DEQ) has denied a petition by the board of commissioners in Lincoln County seeking to loosen the state’s site-specific regulatory cap on the mining byproduct selenium, which is leaching out of coal mines in British Columbia and contaminating the international watershed at Lake Koocanusa, as well as further downstream in the Kootenai River of Montana and Idaho.”

 

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Last modified: September 29, 2025

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