Robert Massey, the president of Oil Chem, Inc. in Flint, has pleaded guilty to a charge of violating the Clean Water Act.
Massey had a permit from the city of Flint to send treated oily liquids to a wastewater treatment plant, but he didn't have a permit to dump landfill leachate directly into Flint sewers.
Landfill leachate is formed when water filters downward through a landfill, picking up dissolved materials and contaminants from decomposing trash. Federal authorities say some of the leachate contained PCBs, chemicals known to be harmful to humans.