The U.S. Environmental Protection Agency (EPA) convened a public webinar on July 27, 2021, to engage with stakeholders on the development of a proposed rule under the Toxic Substances Control Act (TSCA) to implement a tiered data collection strategy intended to inform EPA’s prioritization, risk evaluation, and risk management activities for chemical substances or mixtures. According to the July 14, 2021, Federal Register notice announcing the webinar, EPA currently primarily collects exposure-related data through the TSCA Chemical Data Reporting (CDR) process. EPA is exploring a data reporting rule that is tiered to specific stages of the TSCA existing chemicals program: identifying a pool of substances as potential candidates for prioritization; selecting candidate chemicals for and completing the prioritization process; and assessing high-priority substances through a robust risk evaluation that may be followed by risk management actions (depending on the outcome of the risk evaluation). EPA states that feedback from the public webinar and comments received will help inform its development of a proposed rule. For more information, please read the full memorandum.