EPA is considering amendments to certain aspects of the December 2024 Toxic Substances Control Act (TSCA) section 6(a) rule addressing the unreasonable risk presented by carbon tetrachloride (CTC). EPA is initiating a rulemaking to amend previously promulgated provisions to address this unreasonable risk. EPA will solicit public comment on potential amendments through a notice of proposed rulemaking. Section 6 of TSCA requires EPA to address any unreasonable risk that the Administrator has determined is presented by a chemical substance under the conditions of use. Following a risk evaluation carried out under the authority of TSCA section 6(b), EPA determined that CTC presents an unreasonable risk of injury to health. EPA's risk evaluation, describing the conditions of use and presenting EPAs determinations of unreasonable risk, is in docket EPA-HQ-OPPT-2019-0499, with the 2022 revised risk determination and additional information in docket EPA-HQ-OPPT-2016-0733. EPA's final rule, Carbon Tetrachloride (CTC); Regulation Under the Toxic Substances Control Act (TSCA), published on December 18, 2024, and is in docket EPA-HQ-OPPT-2020-0592.