1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2-benzopyran (HHCB); Risk Evaluation Under the Toxic Substances Control Act (TSCA); Notice of Data Availability and Request for Comment

Official abstract: The Environmental Protection Agency (EPA or Agency) is announcing the availability of data and supporting materials related to the draft risk evaluation under the Toxic Substances Control Act (TSCA) for 1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[γ]-2- benzopyran (HHCB) (CASRN 1222-05-5). These materials are intended to inform the public and interested parties about the information considered by the Agency in the draft risk evaluation. During the public comment period for the draft risk evaluation of HHCB (April 14, 2026, to June 15, 2026), EPA became aware of an inadvertent administrative issue in its Health and Environmental Research Online (HERO) system that made 24 industry-submitted studies considered in Draft Risk Evaluation for 1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8- hexamethylcyclopenta[γ]-2-benzopyran (HHCB) unavailable to the public. On October 14, 2026, this issue was resolved and the studies were made available to the public in HERO. The Agency invites interested persons to review the newly available materials in the context of the draft risk evaluation and submit comments within a 30- day comment period.