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Prop 65 Materials


Proposition 65 Warning Regulations – WCLBMA, in consultation with outside legal counsel, has prepared ready-to-place warning signage that will provide warnings for the most common items sold in a lumber, hardware or building materials business.  The materials also contain information for manufacturers and suppliers on their responsibilities under the new regulations.

Order your set of materials today!  Prop 65 Warnings Flyer

For additional information contact WCLBMA at 800/266-4344 or


Proposition 65 In 1986, California voters approved an initiative to address their growing concerns about exposure to toxic chemicals. That initiative became the Safe Drinking Water and Toxic Enforcement Act of 1986, better known by its original name of Proposition 65. Proposition 65 requires the State to publish a list of chemicals known to cause cancer or birth defects or other reproductive harm. This list, which must be updated at least once a year, has grown to include approximately 950+ chemicals since it was first published in 1987 (as of March 2021).

Proposition 65 requires businesses to notify Californians about significant amounts of chemicals in the products they purchase, in their homes or workplaces, or that are released into the environment. By providing this information, Proposition 65 enables Californians to make informed decisions about protecting themselves from exposure to these chemicals. Proposition 65 also prohibits California businesses from knowingly discharging significant amounts of listed chemicals into sources of drinking water.

Proposition 65 is administered by the Office of Environmental Health Hazard Assessment, a department of the California Environmental Protection Agency.  More information on Proposition 65 may be found at