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System Framework:
US Chemical & Toxic Substances Management Regulatory System

US TSCA Significant New Use Rules (SNUR)

ENFORCEMENT TIMELINE

Updated on an ongoing basis

Enforcement: Updated on an ongoing basis
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Overview

Significant New Use Rules (SNURs) established by EPA under TSCA Section 5(a)(2). The system requires companies to submit a Significant New Use Notice (SNUN) to EPA and complete a 90-day review before manufacturing, importing, processing, or using a designated chemical substance for a use or quantity that qualifies as a "significant new use" (SNU).

Enforcement Timeline

- Issued and effective on an ongoing basis for individual chemical substances (added and designated via the EPA Federal Register)

- After SNUN submission: A 90-day EPA pre-review period (extendable as needed)

- After EPA completes its review (or issues conditional approval or additional testing orders): Manufacturing, import, or use may begin

Related Regulations / Topics

U.S. TSCA Section 5 Significant New Use Rules (SNUR): Recent Designation Batches and Practical Implications

Under TSCA Section 5, the U.S. Environmental Protection Agency (EPA) continues to issue Significant New Use Rules (SNURs) designating new uses for new or existing chemical substances. The most recent SNUR designation batches, issued between 2025 and 2026, designate specific multi-walled carbon nanotubes (MWCNTs), novel fluorinated surfactants, and certain aromatic amine compounds, among others. Companies seeking to manufacture, import, process, or use these substances for a SNUR-designated use are required to submit a Significant New Use Notice (SNUN) to EPA at least 90 days before the activity and to obtain EPA's review and clearance (prior approval).

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Business Impact

Companies supplying chemical substances, materials, compounds, and certain articles to the U.S. market must continuously monitor whether the substances they handle are subject to a SNUR designation and whether their proposed uses trigger the designated SNU requirements. Violations are treated as unreported imports and can result in product seizure and substantial civil penalties.

Official Sources & Reference Links