According to the CDC, bottled water products labeled as de-ionized, purified or distilled have been treated in such a way that they contain no or only trace amounts of fluoride, unless they specifically list fluoride as an added ingredient.

Other bottled water products (such as spring water) can contain fluoride that is added or naturally present in the original source of the water.

Food and Drug Administration sets limits for fluoride in bottled water based on several factors, including the source of the water. These limits range from 0.8 to 2.4 milligrams per liter.