PFAS concentrations in the Great Lakes
A 2019 review of PFAS studies from each of the Great Lakes found the highest PFAS concentrations in Lakes Ontario and Erie. PFOS and PFOA, both no longer manufactured in the U.S. but still found in water, were the most common and have been linked to health concerns.
Bars show concentrations of several types of PFAS in each of the Great Lakes. Lake Ontario has the highest overall concentration, followed by Erie, Michigan, Huron and Superior, which had far less than the other four.
