Warning Symbol

The Proposition 65 warning symbol is the pictogram required in Proposition 65 safe harbour warnings: a black exclamation point in a yellow equilateral triangle with a black outline. This symbol is mandated by Title 27 CCR §25603 and must be included in all consumer product long-form and short-form safe harbour warnings, as well as in the new motor vehicle parts and recreational marine vessel parts tailored warnings (effective January 1, 2025). The symbol must be displayed at a size no smaller than the signal word and must be placed conspicuously on the product, label, or packaging. Digital uses of the symbol (websites, e-commerce) must also comply with conspicuousness requirements.

Title 27 CCR §25603 (warning symbol requirements); OEHHA Proposition 65 warning regulations.

The Proposition 65 warning symbol must be correctly reproduced in the specified yellow-and-black format — non-standard colours or symbol formats do not qualify for safe harbour protection. Businesses should obtain the official symbol from OEHHA’s website (p65warnings.ca.gov) or use a standardised vendor-supplied version. For online warnings, the symbol must be visible before purchase. For physical products, the symbol must be placed where it will be seen before or at the time of exposure. The symbol must not be obscured by other packaging elements or reduced in size below minimum requirements.