Transportation Department, Pipeline and Hazardous Materials Safety Administration
To improve efficiency and eliminate redundancy, this final rule streamlines the Hazardous Materials Regulations by modifying how hazardous substances are listed. Instead of maintaining a duplicative list, the regulations will now rely on the authoritative, comprehensive list already maintained by the U.S. Environmental Protection Agency.
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Pipeline and Hazardous Materials Safety Administration 49 CFR Parts 171, 172, and 173 [Docket No. PHMSA-2025-0093 (HM-268E)] RIN 2137-AG07 AGENCY: Pipeline and Hazardous Materials Safety Administration (PHMSA), Department of Transportation (DOT). ACTION: Final rule. SUMMARY: To improve efficiency and eliminate redundancy, this final rule streamlines the Hazardous Materials Regulations by modifying how hazardous substances are listed. Instead of maintaining a duplicative list, the regulations will now rely on the authoritative, comprehensive list already maintained by the U.S. Environmental Protection Agency. DATES: This final rule is effective December 2, 2026. FOR FURTHER INFORMATION CONTACT: Tony Horne, Standards and Rulemaking Division, Pipeline and Hazardous Materials Safety Administration (PHMSA), 1200 New Jersey Avenue SE, Washington, DC 20590, 202-366-8553, tony.horne@dot.gov . I. PHMSA Action A. What action is PHMSA taking in this final rule? PHMSA is modifying how hazardous substances and their reportable quantities are listed within the Hazardous Materials Regulations (HMR). Specifically, rather than maintaining a duplicative list found in Tables 1 and 2 to Appendix A of 49 CFR 172.101 that must be periodically ( printed page 49306) revised for consistency with the U.S. Environmental Protection Agency (EPA) list found at 40 CFR 302.4 , PHMSA is amending Appendix A to reference the EPA list directly. In addition, PHMSA is revising the def…
Other Federal Register documents from the same docket.
Citation: 91 FR 49305
