A first-of-its-kind study published this week shows that levels of toxic per- and polyfluoroalkyl substances, or PFAS, are now so ubiquitous in the environmental that they have begun building up in the Great Lakes Basin after entering it through rainwater and the air, contaminating 95% of the United States’ fresh surface water supply.

Researchers at Indiana University, Bloomington and Environment and Climate Change Canada published the study Thursday, revealing that “background levels” of PFAS, also called “forever chemicals,” are so high that atmospheric counts were consistent throughout the basin.

“The PFAS in rain could be carried from local sources, or have traveled long distances from other regions. Regardless, it is a major source of pollution that contributes to the lakes’ levels,” reported The Guardian on Saturday.

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