"New data suggests that the safety threshold for PFOA in drinking water should be as low as .1 parts per trillion, according to the nation’s top toxicologist. Linda Birnbaum, director of the National Institute for Environmental Health Sciences, cited the figure, which is 700 times lower than the safety level set by the Environmental Protection Agency, at a conference on PFAS at Northeastern University last week.
While PFOA has already been tied to kidney and testicular cancer, among other diseases, recent research linking PFOA exposure to pancreatic cancer is the basis for the lower number cited by Birnbaum. The research was done by the National Toxicology Program, which is a division of the NIEHS.
“If you look at the data, pancreatic tumors are present at very, very low concentrations from PFOA,” Birnbaum told the audience at the conference. “If you use the pancreatic tumors in the rats in the NTP study to calculate what would really be a virtually safe dose, you’re getting down at about .1 ppt. Well, that’s really low. And that’s only for one PFAS.” Birnbaum suggested that regulators might ultimately issue one drinking water standard for the entire class, which contains thousands of compounds."
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