Regulation ChangeLiveLive Regulation
EPA Finalizes 1,3-Butadiene Risk Evaluation under TSCA
TSCA Section 6 — Risk Evaluation for 1,3-ButadieneU.S. Environmental Protection Agency (EPA)US
Announced
Dec 15, 2025
Description
EPA completed the final risk evaluation for 1,3-Butadiene (CAS 106-99-0) under TSCA in December 2025. The risk evaluation determines whether the chemical presents unreasonable risk to health or the environment under its conditions of use, which will inform potential risk management actions under TSCA Section 6.
Key Findings
EPA Finalizes 1,3-Butadiene Risk Evaluation under TSCA
| 1,3-Butadiene | 106-99-0 | N/A | December 2019 | EPA-HQ-OPPT-2018-0451, EPA-HQ-OPPT-2024-0425 | Final risk evaluation (December 2025) | Kyle Spatz Email:1.3.Butadiene.TSCA@epa.gov Phone: (202) 564-3201 | | [1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta [g]-2-benzopyran (HHCB)]( | 1222-05-5 | Fragrance additives | December 2019 | EPA-HQ-OPPT-2018-0430 | Draft risk evaluation (April 2026) | Jeffrey Putt Emai