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EPA/OCSPP RIN: 2070-AK61 Publication ID: Fall 2020 
Title: Hexachlorobutadiene (HCBD); Regulation of Persistent, Bioaccumulative, and Toxic Chemicals Under TSCA Section 6(h) 

Section 6(h) of the Toxic Substances Control Act (TSCA) directs EPA to issue regulations under section 6(a) for certain persistent, bioaccumulative, and toxic chemical substances that were identified in the 2014 update of the TSCA Work Plan. EPA is selecting among the available prohibitions and other restrictions in TSCA section 6(a), in order to address risks of injury to health or the environment that the Administrator determines are presented by the chemical substances and reduce exposure to the chemical substances to the extent practicable. EPA intends to take final action on all of the chemicals that were addressed in the proposed rule that published on July 29, 2019 (i.e., the following persistent, bioaccumulative, and toxic chemicals identified pursuant to TSCA section 6(h): decabromodiphenyl ether; phenol, isopropylated phosphate (3:1), also known as tris(4-isopropylphenyl) phosphate; 2,4,6-tris(tert-butyl)phenol; pentachlorothiophenol; and hexachlorobutadiene). Although addressed in a single proposed rule, EPA intends to issue separate final rules. As such, the original Regulatory Agenda entry (RIN 2070-AK34) was split into five separate Regulatory Agenda entries. This particular entry is for hexachlorobutadiene (HCBD). HCBD is produced as a byproduct in the production of chlorinated solvents and a small percentage of the HCBD is sent off-site for incineration or for burning as a waste fuel. For information about the other chemical substances, see the Regulatory Agenda entries identified as RIN 2070-AK34 (decabromodiphenyl ether); RIN 2070-AK58 (tris(4-isopropylphenyl) phosphate. PIP (3:1)); RIN 2070-AK59 (2,4,6-tris(tert-butyl)phenol); and RIN 2070-AK60 (pentachlorothiophenol).

Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
EO 13771 Designation: Regulatory 
CFR Citation: 40 CFR 751   
Legal Authority: 15 U.S.C. 2605 TSCA 6   
Legal Deadline:
Action Source Description Date
Final  Statutory  TSCA section 6(h)  12/22/2020 
Action Date FR Cite
NPRM  07/29/2019  84 FR 36728   
Final Rule  12/00/2020 
Additional Information: Docket #:EPA-HQ-OPPT-2019-0080
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:  
Sectors Affected: 211 Oil and Gas Extraction; 325 Chemical Manufacturing; 327 Nonmetallic Mineral Product Manufacturing; 424 Merchant Wholesalers, Nondurable Goods; 561 Administrative and Support Services; 562 Waste Management and Remediation Services 
RIN Data Printed in the FR: No 
Related RINs: Related to 2070-AK34, Related to 2070-AK58, Related to 2070-AK59, Related to 2070-AK60 
Agency Contact:
Victoria Ellenbogen
Environmental Protection Agency
Office of Chemical Safety and Pollution Prevention
Mail Code 7404M, 1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-2053

Michelle Price
Environmental Protection Agency
Office of Chemical Safety and Pollution Prevention
1200 Pennsylvania Avenue NW, Mail Code 7404T,
Washington, DC 20460
Phone:202 566-0744