1,4-Dioxane; Supplement to the Risk Evaluation and Revised Unreasonable Risk Determination Under the Toxic Substances Control Act (TSCA); Notice of Availability

Issuing agencies

Abstract

The Environmental Protection Agency (EPA or the Agency) is announcing the availability of the final supplement to the risk evaluation and revised unreasonable risk determination under the Toxic Substances Control Act (TSCA) for 1,4-dioxane. The purpose of risk evaluations under TSCA is to determine whether a chemical substance presents an unreasonable risk of injury to human health or the environment, without consideration of costs or non-risk factors, including unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant to the risk evaluation by EPA, under the conditions of use. The Agency 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. Under TSCA, EPA must initiate risk management actions to address the unreasonable risk.