Fluoride is a trace mineral, meaning it is in very small amounts. It is one of many trace minerals found in a variety of foods and algae. We have tested for Flouride periodically. We do know in general it is a very minimal trace amount, meaning far less than 1 ppm (part per million). Unfortunately, because we’d have to do bioassays on every batch in order to state an exact number, the costs of these ongoing tests would make the product prohibitively expensive.
Because fluoride is one of the earth’s crust’s minerals, it’s nearly impossible to get water with undetectable amounts of fluoride. The only sure way is through distilled water, which is not something we’d recommend.
It's important to note that the presence of fluoride in natural spring water is distinct from the addition of fluoride to public water supplies. The type of fluoride naturally found in spring water is calcium fluoride, whereas the type added to municipal water, at least in the US, comes in 3 forms: sodium fluoride, sodium fluorosilicate, and fluorosilicic acid.