EPA Finalizes SNURs for Select TSCA Chemical Substances

On July 17, 2025, the U.S. Environmental Protection Agency (EPA) published a final rule in the Federal Register (90 FR 33283), issuing Significant New Use Rules (SNURs) under Toxic Substances Control Act (TSCA). These rules apply to several chemical substances previously submitted through premanufacture notices (PMNs) and also subject to TSCA Orders issued by EPA. 

New Use Notification Requirement 
SNURs mandate that any person intending to manufacture (including import) or process the listed chemical substances for a use identified as a “significant new use” must notify EPA at least 90 days in advance. This notification gives EPA the opportunity to evaluate potential health or environmental risks and impose restrictions or mitigation measures before the activity may proceed. 

Effective and Promulgation Dates 
Final rule is codified under 40 CFR Part 721 and becomes effective on September 15, 2025. For judicial review purposes.

Access to Rule Documents 
Stakeholders can access the full rule and supporting documents through Docket EPA-HQ-OPPT-2024-0079 on Regulations.gov. This rule was previously notified to the World Trade Organization under the symbol G/TBT/N/USA/2171. 

EPA encourages all stakeholders to review the final rule carefully to ensure full compliance with the SNUR notification requirements before undertaking any new use of the listed substances.