Proposition 65 requires the State of California to maintain and update a list of chemicals that can cause cancer, birth defects or other reproductive harm. Businesses with 10 or more employees that expose individuals to listed chemicals through their products or operations generally must provide warnings.
This website, operated by California’s Office of Environmental Health Hazard Assessment (OEHHA, or the Office), provides information about these chemicals and how Californians may be exposed to them. The Office posts fact sheets and links to other pertinent information on this website on an ongoing basis.
For more information about Proposition 65, including what warnings mean, when businesses are required to warn about exposures, and other questions, visit our Frequently Asked Questions page.
Visit our Law and Regulations page for links to information on relevant regulations and on the application of Proposition 65 in legal cases.