Staying abreast of California Proposition 65 updates is critical in ensuring your company is aware of changes to the Prop 65 list and other regulatory changes that may impact your company. In this post, we will summarize some of the key elements that have come up over the first 7 months of 2023.

Chemicals added to the Prop 65 list (enforced 1 year from the list date):

  • Anthracene, 2-Bromopropane, and Dimethyl Hydrogen Phosphite (carcinogens; Listed August 11, 2023).
  • 1,1,1-Trichloroethane and Leucomalachite Green (carcinogens; Listed April 21, 2023).
  • 1-Bromo-3-Chloropropane, 1-Butyl Glycidyl Ether, and Glycidyl Methacrylate (carcinogens; Listed January 27, 2023)

Safe Harbor Levels:

  • Changes to NSRL for ethylene oxide = 0.058 ug/day (down from previous level of 2.0 ug/day) – comment period closed, awaiting final adoption.
  • Proposed NSRL for antimony trioxide: 0.13 ug/day (inhalation only) – comment period closed, awaiting next steps (extension, adoption, etc).

OEHHA collecting data for possible listing:


  • The Carcinogen Identification Committee (CIC) met in June: no listing decisions made, primarily about cancer hazard assessment approaches and assessment of animal tumor data.


  • From January 1 to July 31, there have been 2350 NOV issued, which is up from previous years with 1722 (2022) and 1861 (2021) for the same period.

If you have any questions about any of these changes or updates, do not hesitate to reach out and ask away!

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