Ohio began litigation against DuPont and Chemours in February 2018 regarding historical emissions of perfluorooctanoic acid, known as PFOA, from the Washington Works site. PFOA was once widely used in a variety of products, including nonstick cookware. Ohio alleged damage to natural resources from the use of the compound, and impropriety in the 2015 spinoff by DuPont that created Chemours.