 In 2001, regulators reported high levels of lead around Doe Run's Herculaneum lead smelter as well as in the blood of local children.Following this finding, Doe Run undertook a large-scale cleanup effort, purchasing approximately 160 homes and replacing soil for over 700 properties to bring the site back into compliance with the U.S. Clean Air Act.In 2010, Doe Run agreed to close the Herculaneum smelter and pay $65 million for past violations of federal Clean Air and Clean Water acts.