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

This is the public comment period for OEHHA's proposal to adopt a new Section 25501.1 in Article 5 in Title 27 of the California Code of Regulations.  The new section would provide guidance for businesses and the public by establishing default natural background levels for arsenic in rice.

Fri, 07/21/2017 - 8:00am to Thu, 09/07/2017 - 5:00pm

Reports, Notices, Documents