EPA SNURs for 19 chemical substances moved from proposal to final rule on October 15, 2026, when the U.S. Environmental Protection Agency issued Batch 26-1 under the Toxic Substances Control Act. The rule is not yet effective as of November 3, 2026; it will become effective on December 14, 2026. For manufacturers, importers, processors, and affected buyers, the central question is not whether the substances are banned. The rule instead creates a pre-activity review gate for designated significant new uses.

The agency’s final action follows a proposed rule published on June 10, 2026. The final rule states that anyone who intends to manufacture, including import, or process one of the listed substances for a designated significant new use must submit a Significant New Use Notice at least 90 days before starting that activity, and the activity may not begin until EPA completes its review, makes a determination, and takes any required actions under TSCA final rule.

What EPA SNURs Changed In Batch 26-1

Final Rule Status And Effective Date

Batch 26-1 was published as a final rule at 91 FR 65461 on October 15, 2026. The effective date is December 14, 2026, which gives regulated parties a short interval to compare existing activities with the final conditions before the rule becomes enforceable. For judicial review purposes, the rule was deemed promulgated at 1:00 p.m. Eastern Standard Time on October 29, 2026.

The rule covers 19 chemical substances that had pre-manufacture notices and are subject to TSCA Section 5(e) Orders. Those Orders already impose restrictions on the substances. Under the final rule, activity that does not conform to the Order restrictions is treated as a significant new use. That linkage matters because a company may be familiar with a substance in one approved or controlled use but still trigger notice obligations if it changes manufacturing, import, processing, or use conditions in a way covered by the rule.

EPA SNURs And The June 10 Use Cutoff

The designated cutoff date for determining whether a use was already ongoing is June 10, 2026. A use established on or before that date is not treated as new for this rule. Uses that were not established by that date need closer review against the listed significant new use conditions. The public inspection version identifies the covered chemical substances and rule sections, including 40 CFR 721.12260 through 721.12278, in the chemical-substance section of the action public inspection document.

For compliance teams, EPA SNURs create a timing problem as much as a chemistry problem. A new commercial plan can become delayed if the substance identity, PMN history, existing use evidence, and intended conditions are not checked before purchasing, formulation, import, or customer qualification work begins. For more details on regulatory developments affecting manufacturers, Mengo Industries provides insights into these complex requirements.

What The Notice Duty Means For Industry

SNUN Timing And EPA Review

A Significant New Use Notice, often shortened to SNUN, must be submitted at least 90 days before the planned activity begins. The 90-day period should not be treated as a guaranteed launch interval. The final rule states that the activity cannot commence until EPA reviews the notice, makes a determination, and takes any actions required by that determination. That means project schedules should separate internal readiness from legal permission to proceed.

The practical effect of EPA SNURs is that chemical introduction decisions need earlier regulatory screening. A procurement team may see a material as a substitute, a processor may view it as a formulation change, and a sales team may classify it as a customer-specific application. Under the rule, those commercial labels do not decide the TSCA status. The intended use, the controlling Order restrictions, and the timing of the use evidence are the central issues.

Where EPA SNURs Touch Import And Export Controls

The final rule also notes related TSCA obligations for exports and imports. Export activity can trigger TSCA section 12(b) notice duties, while imports can require certification under TSCA section 13. These obligations can reach teams that do not write the chemical-use decision but still execute shipments, customs entries, supplier onboarding, or customer orders.

That cross-functional effect is why documented handoffs matter. Import personnel need to know whether a covered substance is entering under conditions consistent with the relevant Order. Export personnel need to know whether a listed substance or mixture creates TSCA notice duties. Process engineers need access to the same controlled use description used by regulatory staff. For related industrial coverage in the same network, Mengo Industries tracks operational and regulatory developments affecting manufacturers.

Chemical Scope And Evidence Limits

Substance List And Confidential Entries

The rule covers 19 substances, but not every public identifier is available in the same form. Some entries include CAS Registry Numbers, while other entries are generic or include information claimed as confidential business information. Companies should not rely on common names, supplier nicknames, or short product descriptions to decide whether the rule applies.

The table above is a selected view from the research record, not a substitute for the final regulatory text. The full scope must be checked against the rule sections assigned to each substance. Where confidential identity limits public detail, firms may need supplier confirmation or internal confidential records to establish whether a purchased material corresponds to a listed PMN substance.

Cost Signals And Small Business Findings

EPA estimated the cost of preparing and submitting a SNUN at about $45,000 for large businesses and about $14,500 for qualifying small businesses. The rule also identifies user fees of $37,000 for large entities and $6,480 for small businesses. Those figures do not necessarily capture every internal cost for a specific company, such as legal review, supplier confirmation, use mapping, management approval, or schedule delay.

The agency stated that the rule is not expected to have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act. That finding is a regulatory assessment, not a guarantee that every small firm will face minimal operational burden. A small importer with one covered material in a time-sensitive product line could still face a material planning issue if review starts late.

Practical Compliance Checks Before December 14

Supply Chain And Records

Before the December 14, 2026 effective date, regulated parties have a defined window to compare actual activity with the final rule. The review should be evidence-based. A statement that a substance has been used before may not be enough if the company cannot show the use was established on or before June 10, 2026, or if the intended activity departs from the conditions in the applicable TSCA Section 5(e) Order.

• Match substance identity to PMN number, CAS Registry Number where available, and supplier documentation.
• Compare current and planned manufacturing, import, processing, and use conditions with the Order restrictions.
• Document whether the activity was established on or before June 10, 2026.
• Check whether export notice or import certification duties may be triggered.
• Build SNUN timing into project approval before commercial commitments are made.

For companies building internal review gates, a related discussion of SNUR compliance for chemical manufacturers may help connect notice timing with use documentation and supply-chain controls.

Limits Of The Final Rule Reading

This rule does not by itself show that all 19 substances present the same hazard profile, exposure pattern, or commercial risk. It shows that EPA has identified significant new use conditions tied to the substances and their Section 5(e) Orders. The public rule also does not provide every confidential substance detail in a way that a buyer can resolve from a product name alone.

That limit should shape implementation. Procurement should not ask suppliers only whether a product is regulated. It should request enough controlled identity and use-condition information to support the company’s own TSCA review. Process changes, new customer applications, changes in import source, or altered processing conditions may need review even if the product name has not changed.

EPA SNURs For 19 Chemical Substances

The practical reading of EPA SNURs in Batch 26-1 is cautious and procedural: the rule establishes a pre-use notice system for specified changes, not a broad public finding that every listed chemical must leave commerce. The most immediate industrial task is to determine whether any activity planned after December 14, 2026 would be a designated significant new use.

A defensible response starts with substance identification, continues through Order-condition review, and ends with a documented decision on whether a SNUN is required. If a notice is required, the 90-day filing requirement and EPA review condition should be treated as part of the commercial schedule, not as paperwork that can be handled after production or import planning is complete.