RENO, Nev. — Fifteen years after federal regulators started assessing damage and health risks at an abandoned Nevada copper mine, the Environmental Protection Agency is moving to designate the contaminated land a Superfund site, a step the state could still oppose.
Rural neighbors of the World War II-era mine that has leaked toxic chemicals for decades won a $19.5 million settlement in 2013 from companies they accused of covering up the contamination to drinking water wells near Yerington, about 65 miles southeast of Reno.
The E.P.A. sent a letter to Gov. Brian Sandoval this week announcing its intention to place the mine on the Superfund’s National Priority List of the nation’s most polluted sites to “mitigate exposures that are a substantial threat to the public health or welfare or the environment.”