Long-Form Warning

A long-form warning is the primary safe harbour warning format under Proposition 65 regulations (Title 27 CCR §25603 and §25607 et seq.), providing consumers with detailed information about their exposure to a listed chemical. For consumer products, the long-form warning must include: the Prop 65 warning symbol (yellow triangle with black exclamation mark); the signal word ‘WARNING:’ (or ‘CA WARNING:’ or ‘CALIFORNIA WARNING:’ per January 2025 amendments); at least one listed chemical name; and a reference to www.P65Warnings.ca.gov. For consumer products with carcinogen exposure: ‘WARNING: This product can expose you to [chemical name], which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.’

Title 27 CCR §25603(a) (consumer product long-form warning); OEHHA December 2024 amendments (effective January 1, 2025) adding ‘CA WARNING’ and ‘CALIFORNIA WARNING’ as alternative signal words.

Long-form warnings are required when a product cannot qualify for the short-form safe harbour (e.g., the package is large enough to include the full warning text). Long-form warnings must be placed on the product, package, or label in a conspicuous location. For products sold online, the long-form warning must appear on the website product page before purchase and prior to exposure. The January 2025 amendments did not change the substantive content of the long-form warning (chemical naming was already required) but added new signal word flexibility.