Proposition 65 is a California law passed by direct voter initiative in 1986 by a 63%–37% vote. Its goals are to protect drinking water sources from toxic substances that cause cancer and birth defects ...

Why is Prop 65 controversial?

It remains politically controversial even after more than 30 years (see Controversy and claimed abuse below), in large part because business objects to Proposition 65's burden of proof , which in effect requires businesses to know the scientific safety level for specific cancer- and birth defect-causing chemicals that ...

What is the CA Prop 65 warning?

The law requires California to publish a list of chemicals known to cause cancer or reproductive toxicity, and for businesses with 10 or more employees to provide warnings when they knowingly and intentionally cause significant exposures to listed chemicals.