Our World Commentary

In November 2010, Wyoming officials asked the EPA to exempt every layer of water below the Lance, regardless of its quality or whether it was being used by the mine, and without additional study. The water quality at those depths was “not reliably known,” they wrote. The EPA should apply the exemptions to all of the deep aquifers, they said, “whether or not they meet the definitions of u2018 underground sources of drinking water’.”

For the EPA, Wyoming’s request opened up a morass of legal and environmental concerns.

In the eight years since the agency had approved the last exemption at the ranch, its scientists had grown increasingly convinced that the deep layers of aquifers beneath the property might contain one of the state’s largest reserves of good water. One layer, the Madison, is described in a state assessment as “probably the most important high-yield aquifer in Wyoming” and supplies…

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