OEHHA added N-methyl-N-formylhydrazine to the Proposition 65 list as a chemical known to cause cancer (effective December 8, 2025). Compliance teams should evaluate whether products, emissions, or workplace activities could expose individuals in California to this substance and whether Prop 65 warnings or exposure assessments are required.
OEHHA expanded the scope of the existing Proposition 65 reproductive toxicity listing for bisphenol S (BPS) by adding the developmental toxicity endpoint (effective December 8, 2025) via the State’s Qualified Experts mechanism (DARTIC). Compliance teams should reassess whether exposures to BPS trigger Prop 65 warning obligations considering the expanded reproductive toxicity endpoint and ensure warnings/supply chain communications remain accurate.
OEHHA posted the latest consolidated 'Proposition 65 List' package (dated December 5, 2025) with downloadable formats (e.g., PDF/Excel/CSV). While this is not itself a new restriction, it is the authoritative consolidated reference used for Prop 65 applicability determinations; compliance teams should use this version (or any newer posted version) as the controlled reference for internal chemical screening and compliance checks.
OEHHA updated/posted the current Proposition 65 chemical list download resources (PDF/Excel/CSV) on its Proposition 65 List webpage, with the list date shown as December 5, 2025. Compliance teams can use these official files as the authoritative reference for verifying whether a substance is listed and for maintaining internal restricted-substance/warning determinations.
OEHHA listed vinyl acetate under Proposition 65 as a chemical known to cause cancer (listing effective January 3, 2025). The Prop 65 warning requirement for significant exposures becomes enforceable starting January 3, 2026 (one-year grace period typical for new listings). Compliance teams should assess products/operations that may expose California consumers/workers to vinyl acetate and implement compliant Prop 65 warnings and related substantiation/documentation before the enforceability date.
OEHHA adopted amendments to the Proposition 65 'clear and reasonable warnings' safe-harbor regulations, including updates impacting use and content of short-form warnings (e.g., requiring identification of at least one listed chemical). The amendments are effective January 1, 2025. Compliance teams should update labeling/artwork, online warnings, and related procedures to meet the amended safe-harbor content requirements and transition provisions.