What happened to the other replies?
Bisphenol A is used in many polycarbonate containers. It has had its fair share of scrutiny. It is also used in cans as a sealant and other plastic drinking bottles.
Any mechanism that atomizes a liquid will likely use more than one type of plastic. The plastics industry is not as well regulated as you would think, and for many years said there was no risk in the use of certain chemicals in the production of polymers intended for contact with humans or food products. They are a large lobby group. It should also be noted that the FDA isn't necessarily the most neutral or unbiased source for identifying dangerous or harmful products. They have a revolving door with industry, like BigPharma, and much of the legislation is written by former employees of said industries.
Either way, you can't avoid plastics in the pump mechanism even if you get a stainless steel container. It also depends of frequency of use, temperature, the type of plastic, and the type of liquid you are using.
Edited by jake t buds - 7/9/16 at 12:39pm