US California Proposition 65 Short-Form Warning Rule Revision
ENFORCEMENT TIMELINE
Full implementation expected following a two-year transition period after finalization around 2025
Overview
California's Proposition 65 (the Safe Drinking Water and Toxic Enforcement Act) requires warning labels on products containing any of roughly 900-plus chemicals known to cause cancer or reproductive harm.
This proposed revision tightens the requirements for the "short-form warning" that has been widely used on product packaging. Under the current rule, a warning can be given without naming a specific chemical; the revision would require that at least one listed chemical be named to improve transparency. It would also tighten consistency requirements for warnings shown in online and catalog sales.
Enforcement Timeline
January 2021: California's OEHHA published its first proposed revision to the short-form warning rule.
October 2023: OEHHA published a modified proposal and opened it for public comment.
Late 2024 – 2025: Finalization and adoption of the rule is expected.
Two years after adoption: A transition period applies, after which the rule takes full effect.
Business Impact
This directly affects any overseas manufacturer that exports or sells products — consumer goods, industrial materials, components, etc. — into California.
1. **Full label redesign required**: The current short-form warning ("⚠ WARNING: Cancer - www.P65Warnings.ca.gov") must be replaced with a version naming the chemical, e.g., "⚠ WARNING: Cancer from [chemical name] - www.P65Warnings.ca.gov." Small products with limited label space will need redesigned printing layouts.
2. **Stronger chemical-disclosure requirements across the supply chain**: Companies must accurately collect information from component suppliers on which Proposition 65-listed substances (phthalates, lead, BPA, etc.) their products contain, substantially increasing compliance overhead.
3. **Significantly higher litigation risk**: Warnings that don't comply with the revised rule become an easy target for private-plaintiff lawsuits (so-called "Prop 65 bounty hunters"), directly increasing exposure to settlement costs, legal fees, and brand-image damage.