Researchers at the University of Wisconsin-Madison have found that naturally occurring foams on state waterways have PFAS levels as much as thousands of times higher than waters that lie below.
The findings are part of a new study published in the journal Environmental Science & Technology. She said the PFAS concentrations in foam were “jaw-dropping.” Samples of foam collected from Lake Monona showed PFAS levels up to roughly 328,000 parts per trillion.