From Michigan to the Nation – A Groundwater Emergency Furious and fearful, residents are asking a simple but urgent question: what’s in my water? Mary Ellen Geist, reporter at Detroit Public Television's Great Lakes Now interviews Dr. Christopher Higgins about the effects of PFAS chemicals. PFAS are the tip of the spear for threats to groundwater in Michigan and nationally. Nitrates, industrial chemicals, and pathogens have been swept underground for decades — aquifers used as garbage cans. What else is in the groundwater? And what are the risks? This H2O Catalyst rounds up the experts who provide answers to listeners toughest questions.