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Health and Safety Code §25249.5 et seq. of the California Safe Drinking Water and Toxic Enforcement Act of 1989 (Proposition 65) requires anyone who during the course of doing business in California knowingly and intentionally exposes an individual to a chemical known to the state to cause cancer or reproductive toxicity to first give a clear and reasonable warning regarding the presence of such chemicals.
Drilling, sawing, sanding or machining wood products can expose those nearby to wood dust, a substance known to the state of California to cause cancer. Prop 65 warnings vary by product and may include other listed chemical substances.