EPA Finalizes TSCA Significant New Use Rules for Certain Chemical Substances
EPA issued TSCA significant new use rules for certain substances that were covered by PMNs and EPA orders, requiring 90-day notice before new manufacture, import, or processing uses.
Key Facts
- The rule was published by the Federal Register on May 22, 2026.
- EPA is issuing significant new use rules under TSCA for certain chemical substances.
- The substances were the subject of premanufacture notices and are also subject to an EPA Order under TSCA.
- The SNURs require notice to EPA at least 90 days before manufacture, import, or processing for a designated significant new use.
- The rule is effective on July 21, 2026, and is promulgated for judicial review at 1 p.m. (EST) on June 5, 2026.
What Happened
EPA is issuing significant new use rules, or SNURs, under the Toxic Substances Control Act for certain chemical substances that were already the subject of PMNs and an EPA Order under TSCA. The Federal Register notice was published on May 22, 2026.
The rule says persons must notify EPA at least 90 days before commencing manufacture, including import, or processing of any of these substances for an activity designated as a significant new use.
Why It Matters
For chemical buyers, lab managers, EHS leads, and industrial operators, SNURs can affect whether a substance may be brought into a facility, imported, or shifted into a new process without advance EPA notice. That makes regulatory screening and change-control checks important before procurement or scale-up decisions.
The practical impact is less about routine handling and more about any planned activity that falls into the rule’s significant new use category. Companies working with new chemistries should verify whether the material is covered before committing supply, trials, or production changes.
Key Details
The notice ties the SNURs to substances that were already reviewed through PMNs and are also subject to EPA orders under TSCA. The effective date is July 21, 2026.
- 90-day notice to EPA is required before a significant new use begins.
- Manufacture is defined by statute to include import.
- The rule was promulgated for judicial review at 1 p.m. (EST) on June 5, 2026.
The Federal Register page also notes that its online edition is a prototype informational resource and that the official legal text should be verified against the official Federal Register or govinfo PDF when needed for legal research.
What To Watch Next
Facilities should compare purchasing specifications, pilot plans, and tolling or contract manufacturing scopes against the final SNUR language once reviewed against the official document. That is especially important where a substance may be imported or introduced into a new use pattern.
Procurement and compliance teams should also watch for any downstream impacts on supplier declarations, internal approvals, and shipping lead times if a 90-day EPA notification is required before a planned activity.
Alliance's Take
Customers should treat these SNURs as a pre-purchase and pre-change-control checkpoint, especially where a chemical may be imported or moved into a new process. Build regulatory review into sourcing and scale-up timelines.
EHS and procurement teams may need to confirm whether a planned use is a significant new use before committing to inventory, tolling, or production schedules. That helps avoid delays tied to EPA notice requirements.
Related Products
Frequently Asked Questions
What does this EPA rule require before a significant new use starts?
It requires a notice to EPA at least 90 days before manufacture, import, or processing for an activity designated as a significant new use.
Which substances does the rule cover?
The rule covers certain chemical substances that were the subject of PMNs and are also subject to an EPA Order under TSCA.
When does the rule take effect?
The rule is effective on July 21, 2026.
Sources
- Significant New Use Rules on Certain Chemical Substances (25-1.5e) — Federal Register (2026)
- Original full text XML
