Freshwater fish in US full of dangerously high levels of PFAS chemicals, study finds

By Sandee LaMotte, CNN

Fish caught in the fresh waters of the nation’s streams and rivers and the Great Lakes contain dangerously high levels of PFOS, short for perfluorooctane sulfonic acid, a known synthetic toxin phased out by the federal government, according to a study of data from the US Environmental Protection Agency.

The chemicals called PFOS are part of a family of manufactured additives known as perfluoroalkyl and polyfluoroalkyl substances, or PFAS, widely used since the 1950s to make consumer products nonstick and resistant to stains, water and grease damage.

Called “forever chemicals” because they fail to break down easily in the environment, PFAS have leached into the nation’s drinking water via public water systems and private wells. The chemicals then accumulate in the bodies of fish, shellfish, livestock, dairy and game animals that people eat, experts say.

“The levels of PFOS found in freshwater fish often exceeded an astounding 8,000 parts per trillion,” said study coauthor David Andrews, a senior scientist at Environmental Working Group, the nonprofit environmental health organization that analyzed the data. The report was published Wednesday in the journal Environmental Research.

In comparison, the EPA has allowed only 70 parts per trillion of PFOS in the nation’s drinking water. Due to growing health concerns, in 2022 the EPA recommended the allowable level of PFOS in drinking water be lowered from 70 to 0.02 parts per trillion.

“You’d have to drink an incredible amount of water — we estimate a month of contaminated water — to get the same exposure as you would from a single serving of freshwater fish,” Andrews said.

“Consuming even a single (locally caught freshwater) fish per year can measurably and significantly change the levels of PFOS in your blood,” Andrews said.

Chemicals in the PFAS family are linked to high cholesterol, cancer and various chronic diseases, as well as a limited antibody response to vaccines in both adults and children, according to a report by the National Academies of Sciences, Engineering, and Medicine.

“This is an important paper,” said toxicologist Linda Birnbaum, former director of the National Institute for Environmental Health Sciences and the National Toxicology Program.

“To find this level of contamination in fish across the country, even in areas not close to industry where you might expect heavy contamination, is very concerning. These chemicals are everywhere,” she said.

It’s nearly impossible to avoid PFAS, experts say. Manufacturers add the chemicals to thousands of products, including nonstick cookware, mobile phones, carpeting, clothing, makeup, furniture and food packaging.

A 2020 investigation found PFAS in the wrapping of many fast foods and “environmentally friendly” molded fiber bowls and containers.

A 2021 study found PFAS in 52% of tested cosmetics, with the highest levels in waterproof mascara (82%), foundations (63%) and long-lasting lipstick (62%). Polytetrafluoroethylene, the coating on nonstick pans, was the most common additive.

In fact, PFAS chemicals have been found in the blood serum of 98% of Americans, according to a 2019 report using data from the U.S. Centers for Disease Control and Prevention’s National Health and Nutrition Examination Survey.

“These chemicals are ubiquitous in the American environment. More than 2,800 communities in the U.S., including all 50 states and two territories, have documented PFAS contamination,” Dr. Ned Calonge, an associate professor of epidemiology at the Colorado School of Public Health and chair of the Academies committee that wrote the report, told CNN previously.

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Scientists at the Environmental Working Group used data from the EPA’s own monitoring programs — the National Rivers and Streams Assessment, which has been periodically testing stream conditions since 2008, and the Great Lakes Human Health Fish Fillet Tissue Study, which tests lake water every five years.

“The analysis focused on EPA wild-caught fish in rivers, streams and throughout the Great Lakes from 2013 to 2015 as that was the latest data available,” Andrews said.

The contamination was widespread, impacting “nearly every fish across the country,” he said. “I believe there was one sample without detected levels of PFOS.”

The Environmental Working Group created an interactive map of the results with details for each state. Fish caught near urban areas contained nearly three times more PFOS and overall PFAS than those caught in nonurban locations, the study found. The highest levels were found in fish from the Great Lakes.

The analysis showed PFOS accounted for an average 74% of the contamination in the fish. The remaining 25% was a mixture of other PFAS known to be equally damaging to human health, Andrews said.

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