This rulemaking seeks to revise the new chemicals procedural regulations in 40 CFR parts 720, 721, 723, and 725 to clarify and improve the efficiency of EPA’s review process and align its processes and procedures with the 2016 statutory requirements. On June 22, 2016, the Lautenberg amendments to the Toxic Substances Control Act (TSCA) were signed into law and impacted how EPA reviews and makes determinations on new chemical notices under TSCA section 5. As a result of these increased responsibilities, it has become more challenging for EPA to complete reviews within 90 days. This rulemaking seeks to increase the quality of information initially submitted in new chemicals notices and improve the Agency’s processes for timely, effective completion of the risk assessment and, the new chemicals review. This rulemaking also seeks to improve EPA’s existing practices related to the review of certain groups of chemical substances under Pre-Manufacture Notification (PMN) exemptions.