The Significant New Use Rule (SNUR) is a regulatory mechanism used by the United States Environmental Protection Agency (EPA) to control the introduction of new chemicals or new uses of existing chemicals under the Toxic Substances Control Act (TSCA). This rule mandates that manufacturers or processors notify the EPA before commencing any activity that is considered a significant new use of a chemical substance. This allows the EPA to assess potential risks and impose necessary restrictions to protect human health and the environment.
