A notice from the Butte-Silver Bow government warning residents not to drink the water after an Aug. 13 cross contamination of mine water. (Photo by Darrell Ehrlick of the Daily Montanan)

Earlier this month, mining company Montana Resources discovered that a fire hydrant hooked up to the City of Butte’s water supply was cross-contaminating the municipal water with mine water, which has high levels of calcium and sulfates, which can cause laxative effects in humans. Calcium can lead to scale and build-up in water lines and appliances.

Now, a group of Butte residents have filed a class-action lawsuit against the mining company in Butte-Silver Bow District Court, asking for damage claims, as well as a punitive judgment against Montana Resources. Montana Resources is owned by Dennis Washingt

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