Proposition 65

Proposition 65, officially known as the Safe Drinking Water and Toxic Enforcement Act of 1986, was enacted as a ballot initiative in November 1986. The proposition protects the state's drinking water sources from being contaminated with chemicals known to cause cancer, birth defects or other reproductive harm, and requires businesses to inform Californians about exposures to such chemicals.

Proposition 65 requires the state to maintain and update a list of chemicals known to the state to cause cancer or reproductive toxicity.


Questions about Proposition 65? Check our Frequently asked Questions page or contact the Proposition 65 office: (916) 445-6900 or email

Reports, Notices, Documents

May 1, 1990: Final Statement of Reasons - Quantitative Risk Assessment
This regulatory action amends subsection (b) of section 12703 to add two additional examples of public health considerations: (1) Where chemicals in food are produced by cooking necessary to render the food palatable or to avoid microbiological contamination; and (2) where chlorine disinfection in compliance with all applicable state and federal safety standards is necessary to comply with sanitation requirements.