Prop 65 continues to grow with the addition of a natural and commonly manufactured chemical used in many products including model airplane glue. California’s Office of Environmental Health Hazard Assessment (OEHHA) has added methylisopropyl ketone to the Proposition 65 list.  Proposition 65, also known as the Safe Water and Toxic Enforcement Act of 1986, requires the state to list chemicals that are known to cause cancer or reproductive toxicity.  Methylisopropyl ketone, an industrial solvent, was listed as causing reproductive toxicity.

Listing of a chemical generally requires a company doing business in California to provide a warning before exposing anyone to a chemical on the list, and to prevent discharging listed chemicals into any sources of drinking water.  Business have 12 months from the listing date to comply with warning requirements, and 20 months to comply with discharge requirements.  In recent years Prop 65 has been criticized as encouraging nuisance claims against small businesses and allowing warnings to become too commonplace to have meaning.

More information on Proposition 65 listings, requirements, and compliance is available on OEHHA’s Proposition 65 website.