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

Upcoming Events

Reports, Notices, Documents

Nov 16, 2018: Proposed Amendments to Article 6 Clear and Reasonable Warnings Section 25600.2 Responsibility to Provide Consumer Products Exposure Warnings
In August 2016, OEHHA adopted the new Article 6 of Title 27, California Code of Regulations, Section 25600 et seq. OEHHA adopted amendments to the regulations on November 20, 2017 to clarify and make more specific certain provisions of Article 6.  Based upon questions received and additional input from stakeholders, this rulemaking proposes additional clarifying changes to Section 25600.2, subsections (b), (c), and (f).