Frequently Asked Questions


Passed into law by California’s voters in 1986, Prop 65 is intended to help California residents make informed decisions about the products they buy.


The law states that companies selling products in California must display a warning when the product contains one or more of the approximately 800 chemicals known to the state of California to cause cancer and/or reproductive harm.

Why has MSR placed a Proposition 65 label on its products?
Any company with 10 or more employees operating or selling products within the State of California must comply with the requirements of Proposition 65. To comply, businesses are: (1) prohibited from knowingly discharging listed chemicals into sources of drinking water; and (2) required to provide a "clear and reasonable" warning before knowingly and intentionally exposing anyone to a listed chemical.

A Proposition 65 warning means that the business has evaluated the exposure and has concluded that it exceeds the "no significant risk level," or that the business is providing a warning based on the presence of a "listed" chemical without actually evaluating the exposure.

MSR is providing a warning based on our knowledge about the presence of one or more listed chemicals without attempting to evaluate the level of exposure. While using an MSR product, the exposure to a "listed" chemical may be well within the "no significant risk" range, but out of caution, we have placed the Proposition 65 warning labels on our products.

Are consumers who are using an MSR product with a Proposition 65 warning at risk?
The California government states: "The fact that a product bears a Proposition 65 warning does not mean by itself that the product is unsafe." The government also explained, "You could think of Proposition 65 more as a 'right to know' law than a pure product safety law."

A Proposition 65 warning means that the product contains one or more listed chemicals. By law, a warning is required unless the business proves that the exposure to the chemical poses "no significant risk." The "no significant risk" level for carcinogens is defined as the level which is calculated to result in not more than one excess case of cancer in 100,000 individuals exposed over a 70-year lifetime. Therefore, if you are exposed to the chemical in question at this level every day for 70 years, theoretically, it will increase your chances of getting cancer by no more than 1 case in 100,000 individuals so exposed.

The "no significant risk" level for reproductive toxicants is defined as the level of exposure which, even if multiplied by 1,000, will not produce birth defects or other reproductive harm. Therefore, the level of exposure is below the "no observable effect level," divided by 1,000. (The "no observable effect level" is the highest dose level which has not been associated with observable reproductive harm in humans or test animals.) For further information about California's Proposition 65, please visit http://oehha.ca.gov/prop65/background/p65plain.html