All the materials used in making a coffee thermos have to be lead-free is a mandatory requirement by the FDA and NSF. This is tested via rigorous independent lab tests. Moreover, all the containers are BPA plastic-free. However, beware of the brands with an unknown reputation. They claim to use food-grade safe materials, but on washing the thermos from the inside, you will notice silver and black deposits, causing serious damage to your stomach and intestines.