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Proposed Rule

Significant New Use Rules on Certain Chemical Substances (21-4.F)

In Plain English

What is this Federal Register notice?

This is a proposed rule published in the Federal Register by Environmental Protection Agency. Proposed rules invite public comment before becoming final, legally binding regulations.

Is this rule final?

No. This is a proposed rule. It has not yet been finalized and is subject to revision based on public comments.

Who does this apply to?

Consult the full text of this document for specific applicability provisions. The affected parties depend on the regulatory scope defined within.

When does it take effect?

No specific effective date is indicated. Check the full text for date provisions.

📋 Rulemaking Status

This is a proposed rule. A final rule may be issued after the comment period and agency review.

Regulatory History — 24 documents in this rulemaking

  1. Apr 8, 2024 2024-07262 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (21-4.F)
  2. Jun 11, 2024 2024-12764 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (22-4.5e)
  3. Jun 11, 2024 2024-12620 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (23-3.5e)
  4. Aug 20, 2024 2024-18259 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-1.5e)
  5. Sep 27, 2024 2024-22168 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (21-3.F)
  6. Nov 29, 2024 2024-27913 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-1.F)
  7. Nov 29, 2024 2024-27914 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (22-1.5e)
  8. Dec 2, 2024 2024-27912 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-2.5e)
  9. Dec 12, 2024 2024-29276 Final Rule
    Significant New Use Rules on Certain Chemical Substances (22-4.5e)
  10. Dec 17, 2024 2024-29275 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-3.5e)
  11. Jan 6, 2025 2024-30964 Final Rule
    Significant New Use Rules on Certain Chemical Substances (19-5.F)
  12. Apr 4, 2025 2025-05480 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-4.5e)
  13. Jun 13, 2025 2025-10812 Final Rule
    Significant New Use Rules on Certain Chemical Substances (23-3.5e)
  14. Jun 23, 2025 2025-11489 Final Rule
    Significant New Use Rules on Certain Chemical Substances (24-2.5e)
  15. Jul 9, 2025 2025-12704 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (23-2.5e); Withdrawal
  16. Jul 17, 2025 2025-13363 Final Rule
    Significant New Use Rules on Certain Chemical Substances (24-3.5e)
  17. Jul 21, 2025 2025-13677 Final Rule
    Significant New Use Rules on Certain Chemical Substances (23-3.5e); Correction
  18. Jul 23, 2025 2025-13834 Final Rule
    Significant New Use Rules on Certain Chemical Substances (24-2.5e); Correction
  19. Jul 29, 2025 2025-14256 Final Rule
    Significant New Use Rules on Certain Chemical Substances (24-1.5e)
  20. Oct 28, 2025 2025-19673 Proposed Rule
    Modification of Significant New Use Rules of Certain Chemical Substances (23-...
  21. Nov 3, 2025 2025-19756 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (24-5.5e)
  22. Nov 3, 2025 2025-19757 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (25-2.5e)
  23. Nov 3, 2025 2025-19755 Proposed Rule
    Significant New Use Rules on Certain Chemical Substances (25-1.5e)
  24. Nov 4, 2025 2025-19773 Final Rule
    Significant New Use Rules on Certain Chemical Substances (24-4.5e)

Document Details

Document Number2024-07262
TypeProposed Rule
PublishedApr 8, 2024
Effective Date-
RIN2070-AB27
Docket IDEPA-HQ-OPPT-2021-0228
Text FetchedYes

Agencies & CFR References

CFR References:

Linked CFR Parts

PartNameAgency
No linked CFR parts

Paired Documents

TypeProposedFinalMethodConf
No paired documents

Related Documents (by RIN/Docket)

Doc #TypeTitlePublished
2025-19773 Final Rule Significant New Use Rules on Certain Che... Nov 4, 2025
2025-19756 Proposed Rule Significant New Use Rules on Certain Che... Nov 3, 2025
2025-19757 Proposed Rule Significant New Use Rules on Certain Che... Nov 3, 2025
2025-19755 Proposed Rule Significant New Use Rules on Certain Che... Nov 3, 2025
2025-19673 Proposed Rule Modification of Significant New Use Rule... Oct 28, 2025
2025-14256 Final Rule Significant New Use Rules on Certain Che... Jul 29, 2025
2025-13834 Final Rule Significant New Use Rules on Certain Che... Jul 23, 2025
2025-13677 Final Rule Significant New Use Rules on Certain Che... Jul 21, 2025
2025-13363 Final Rule Significant New Use Rules on Certain Che... Jul 17, 2025
2025-12704 Proposed Rule Significant New Use Rules on Certain Che... Jul 9, 2025

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Full Document Text (16,741 words · ~84 min read)

Text Preserved
ENVIRONMENTAL PROTECTION AGENCY <CFR>40 CFR Part 721</CFR> <DEPDOC>[EPA-HQ-OPPT-2021-0228; FRL-11762-01-OCSPP]</DEPDOC> <RIN>RIN 2070-AB27</RIN> <SUBJECT>Significant New Use Rules on Certain Chemical Substances (21-4.F)</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Environmental Protection Agency (EPA). <HD SOURCE="HED">ACTION:</HD> Proposed rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for chemical substances that were the subject of premanufacture notices (PMNs). The chemical substances received “not likely to present an unreasonable risk” determinations pursuant to TSCA. The SNURs require persons who intend to manufacture (defined by statute to include import) or process any of these chemical substances for an activity that is proposed as a significant new use by this rulemaking to notify EPA at least 90 days before commencing that activity. The required notification initiates EPA's evaluation of the use, under the conditions of use for that chemical substance. In addition, the manufacture or processing for the significant new use may not commence until EPA has conducted a review of the required notification, made an appropriate determination regarding that notification, and taken such actions as required by that determination. </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> Comments must be received on or before May 8, 2024. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> Submit your comments, identified by docket identification (ID) number EPA-HQ-OPPT-2021-0228, through the Federal eRulemaking Portal at <E T="03">https://www.regulations.gov.</E> Follow the online instructions for submitting comments. Do not submit electronically any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Additional instructions on commenting and visiting the docket, along with more information about dockets generally, is available at <E T="03">https://www.epa.gov/dockets.</E> <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> <E T="03">For technical information contact:</E> William Wysong, New Chemicals Division (7405M), Office of Pollution Prevention and Toxics, Environmental Protection Agency, 1200 Pennsylvania Ave. NW, Washington, DC 20460-0001; telephone number: (202) 564-4163; email address: <E T="03">wysong.william@epa.gov.</E> <E T="03">For general information contact:</E> The TSCA-Hotline, ABVI-Goodwill, 422 South Clinton Ave., Rochester, NY 14620; telephone number: (202) 554-1404; email address: <E T="03">TSCA-Hotline@epa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> <HD SOURCE="HD1">I. Executive Summary</HD> <HD SOURCE="HD2">A. What is the Agency's authority for taking this action?</HD> TSCA section 5(a)(2) (15 U.S.C. 2604(a)(2)) authorizes EPA to determine that a use of a chemical substance is a “significant new use.” EPA must make this determination by rule after considering all relevant factors, including the factors in TSCA section 5(a)(2) (see also the discussion in Unit II.). <HD SOURCE="HD2">B. What action is the Agency taking?</HD> EPA is proposing SNURs for chemical substances that were the subject of PMNs as discussed in Unit III. These SNURs, if finalized as proposed, would require persons who intend to manufacture or process any of these chemical substances for an activity that is designated as a significant new use to notify EPA at least 90 days before commencing that activity. <HD SOURCE="HD2">C. Does this action apply to me?</HD> <HD SOURCE="HD3">1. General Applicability</HD> This action applies to you if you manufacture, process, or use the chemical substances contained in this proposed rule. The following list of North American Industrial Classification System (NAICS) codes is not intended to be exhaustive, but rather provides a guide to help readers determine whether this document applies to them. Potentially affected entities may include: • Manufacturers or processors of one or more subject chemical substances (NAICS codes 325 and 324110), <E T="03">e.g.,</E> chemical manufacturing and petroleum refineries. <HD SOURCE="HD3">2. Applicability to Importers and Exporters</HD> This action may also apply to certain entities through pre-existing import certification and export notification rules under TSCA ( <E T="03">https://www.epa.gov/tsca-import-export-requirements</E> ). Chemical importers are subject to the import provisions in TSCA section 13 (15 U.S.C. 2612), the requirements promulgated at 19 CFR 12.118 through 12.127; see also 19 CFR 127.28, and the EPA policy in support of import certification at 40 CFR part 707, subpart B. Chemical importers must certify that the shipment of the chemical substance complies with all applicable rules and orders under TSCA, including regulations issued under TSCA sections 5, 6, 7 and title IV. Pursuant to 40 CFR 721.20, any persons who export or intend to export a chemical substance that is the subject of this proposed rule on or after May 8, 2024 are subject to the export notification provisions of TSCA section 12(b) (15 U.S.C. 2611(b)) and must comply with the export notification requirements in 40 CFR part 707, subpart D. <HD SOURCE="HD2">D. What are the incremental economic impacts of this action?</HD> EPA has evaluated the potential costs of establishing significant new use notice (SNUN) reporting requirements for potential manufacturers (including importers) and processors of the chemical substances subject to these proposed SNURs. This analysis, which is available in the docket, is briefly summarized here. <HD SOURCE="HD3">1. Estimated Costs for SNUN Submissions</HD> If a SNUN is submitted, costs are an estimated $26,700 per SNUN submission for large business submitters and $11,000 for small business submitters. These estimates include the cost to prepare and submit the SNUN (including registration for EPA's Central Data Exchange (CDX)), and the payment of a user fee. Businesses that submit a SNUN would be subject to either a $19,020 user fee required by 40 CFR 700.45(c)(2)(ii) and (d), or, if they are a small business as defined at 13 CFR 121.201, a reduced user fee of $3,300 (40 CFR 700.45(c)(1)(ii) and (d)) per fiscal year 2022. The costs of submission for SNUNs will not be incurred by any company unless a company decides to pursue a significant new use as defined in these SNURs. Additionally, these estimates reflect the costs and fees as they are known at the time of this rulemaking. <HD SOURCE="HD3">2. Estimated Costs for Export Notifications</HD> EPA has also evaluated the potential costs associated with the export notification requirements under TSCA section 12(b) and the implementing regulations at 40 CFR part 707, subpart D. For persons exporting a substance that is the subject of a SNUR, a one-time notice to EPA must be provided for the first export or intended export to a particular country. The total costs of export notification will vary by chemical, depending on the number of required notifications ( <E T="03">i.e.,</E> the number of countries to which the chemical is exported). While EPA is unable to make any estimate of the likely number of export notifications for the chemical substances covered by these SNURs, as stated in the accompanying economic analysis, the estimated cost of the export notification requirement on a per unit basis is approximately $106. <HD SOURCE="HD2">E. What should I consider as I prepare my comments for EPA?</HD> <HD SOURCE="HD3">1. Submitting CBI</HD> Do not submit CBI to EPA through email or <E T="03">https://www.regulations.gov.</E> If you wish to include CBI in your comment, please follow the applicable instructions at <E T="03">https://www.epa.gov/dockets/commenting-epa-dockets#rules</E> and clearly mark the information that you claim to be CBI. Information so marked will not be disclosed except in accordance with procedures set forth in 40 CFR parts 2 and 704. <HD SOURCE="HD3">2. Tips for Preparing Your Comments</HD> When preparing and submitting your comments, see the commenting tips at <E T="03">https://www.epa.gov//epa-dockets.</E> <HD SOURCE="HD1">II. Background</HD> This unit provides general information about SNURs. For additional information about EPA's new chemical program go to <E T="03">https://www.epa.gov/reviewing-new-chemicals-under-toxic-substances-control-act-tsca.</E> <HD SOURCE="HD2">A. Significant New Use Determination Factors</HD> TSCA section 5(a)(2) states that EPA's determination that a use of a chemical substance is a significant new use must be made after consideration of all relevant factors, including: • The projected volume of manufacturing and processing of a chemical substance. • The extent to which a use changes the type or form of exposure of human beings or the environment to a chemical substance. • The extent to which a use increases the magnitude and duration of exposure of human beings or the environment to a chemical substance. • The reasonably anticipated manner and methods of manufacturing, processing, distribution in commerce, and disposal of a chemical substance. In determining what would constitute a significant new use for the chemical substances that are the subject of these SNURs, EPA considered relevant information about the toxicity of the chemical substances, and potential human exposures and environmental releases that may be associated with the substances, in the context of the four bulleted TSCA section 5(a)(2) factors listed in this unit and discussed in Unit III. These proposed SNURs include PMN substances that received a “not likely to present an unreasonable risk” determination in TSCA section 5(a)(3)(c). During its review of these chemicals, EPA identified certain conditions of use ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 122k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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