Earlier quoted context omitted.
If you're lucky enough to live somewhere where the crazies haven't defluorinated your water because "you're polluting our pure water with chemicals..."
Crazies or people who actually care about environment? Fluorinating water must be one of the least efficient ways of doing this.
The environment???
Fluoride, like many minerals, is naturally occurring in many water sources, just not (all) of the ones that are used for drinking water. Additionally, the concentration of fluoride for this purpose is minuscule (0.7 mg/L according to Health Canada).