Proposition 65 is officially known as The Safe Drinking Water and Toxic Enforcement Act of 1986, and is specific to California, which generally has standards that are stricter than any other state, as well as those of the US government. California is big business, with the highest population of any state. In order to sell within its boarders, if a product contains any of the approximately 900 chemicals on the list, it must contain this warning. Each chemical on the Prop 65 list includes a safe harbor level, which measures exposure. For formaldehyde, it is 40µg/day.* It doesn't take much, and each of the 900 or so chemicals on the Prop 65 list have safe harbor levels. Many cosmetics, medications, household items, foods and beverages, as well as businesses and services found in California sport a Prop 65 warning. To avoid every product and business with this warning would be an undertaking, but a complete list can be found at https://www.p65warnings.ca.gov/fact-sheets.
The chemicals used in our manufacturing process are not harmful; formaldehyde may sound a little alarming, but it could be likened to the chlorine and that’s found in every drop of tap water. We would neither drink chlorine nor breath concentrated formaldehyde, but we would shower, wash dishes, and store our belongings in items containing well diluted doses. The levels in our furniture are below the set limits of 0.11ppm (parts per million) for MDF and 0.09ppm for particleboard; our products meet certification requirements for both CARB and TSCA, the California and federal government set safety levels, respectively.
For more information, check out the below links.
*µg is the unit of measurement for a microgram, which is a unit of mass equal to one millionth of a gram.