Ohio Governor Mike DeWine sent a letter today to Department of Defense (DOD) Secretary Mark Esper asking DOD to enter into a cooperative agreement with Ohio EPA and the city of Dayton to take more expedient and preventative measures to address per- and polyfluoroalkyl substances (PFAS) contamination and protect the Great Buried Valley Aquifer, which supplies drinking water to more than 2.3 million people in Southwest Ohio, including more than 400,000 people in the Dayton metropolitan area.