On November 13, 2024, the U.S. Environmental Protection Agency (EPA) announced the release of its final supplement to the risk evaluation and revised unreasonable risk determination for 1,4-dioxane under the Toxic Substances Control Act (TSCA). 89 Fed. Reg. 89993. EPA states in the Federal Register notice that it “used the best available science to prepare this final supplement to the risk evaluation and has determined that 1,4-dioxane poses unreasonable risk to human health.” EPA notes that under TSCA, it now must initiate risk management actions to address the unreasonable risk. For more information, read the full memorandum.

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At EPA