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ORS favors 2005 WHO dioxin TEFs; summarizes PFAS-in-septic-system studies and risk-guidance status
Summary
The MassDEP Office of Research and Standards recommended use of the World Health Organization 2005 toxic equivalency factors (TEFs) for dioxin risk calculations, and summarized recent research linking PFAS to septic systems while updating the advisory committee on the status of the department's risk-characterization guidance.
Greg Braun of MassDEP’s Office of Research and Standards told the Wayside Cleanup Advisory Committee that the office recommends using the World Health Organization’s 2005 toxic equivalency factors (TEFs) for dioxin TEF calculations for now, and that the agency is tracking PFAS research on septic-system contributions to groundwater.
Dioxin TEFs: Braun said analysts investigated available TEF sets and analytical issues in laboratory reporting (EPA Method 8290A). "We basically came to the conclusion that the 2005 TEFs from the World Health Organization are the most appropriate TEFs to use at this time," he said, adding that WHO updates in…
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