The so-called California Proposition 65 (officially The Safe Drinking Water and Toxic Enforcement Act of 1986) is a California Law that came into effect in 1986.
The goal of the California Proposition 65
Its goal is to protect residents of California from exposition to chemicals causing cancer or being toxic to reproduction. Based on Proposition 65, the State of California publishes a list of chemicals known to cause cancer, birth defects, or being otherwise harmful to reproduction. The list is updated every year and grew to over 800 substances since its first publication in 1987.
Providing information for the public
The law obliges manufacturers bringing products onto the Californian market to provide information for the public concerning the content of these listed substances and thus potential exposition risk by their products. This warning label shall enable consumers to be aware of this exposure hazard. Its shape and content are defined by the OAHHA (Office of Environmental Health Hazard Assessment). Failure to comply with labelling according to California Proposition 65 will result in severe penalties.
Requirements have been reworked to be more concrete
Since the initial labelling requirements have been overused in order to avoid any kind of liability, risk of exposition became unclear for consumers. Therefore, these requirements have been reworked to be more concrete and provide helpful content and information to the public. The new labelling requirements has become effective on August 30th, 2018.