Proposition 65, also known as California’s Safe Drinking Water and Toxic Enforcement Act of 1986, attempts to protect the public from chemicals in drinking water sources that are known to cause cancer, birth defects, or other reproductive harm by informing citizens about exposures to such chemicals through required warnings. ChemRisk^® scientists helped write the original exposure guidelines for this regulation, and have advised manufacturing clients on the most scientifically appropriate exposure assessments for satisfying the expectations of appropriate regulatory bodies. Evaluated products have included substances such as phthalates in processed cheese, lead in costume jewelry and paints, lead in telephone lines, dioxane in wine, formaldehyde in wood, benzene in paints, and methylene chloride in various solvents. We have worked for many Fortune 100 firms and others who have been questioned about the potential health risks of their products.