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A small percentage get water from private wells with naturally fluoridated water.The Environmental Protection Agency has determined that the accepted "optimal" range of fluoride in water lies between 0.7 and 1.2 parts per million (ppm) or mg per liter.
There is one drop of fluoride in one million drops of water.
The limit allowed by the EPA in public water is 4 ppm.
Backed by results from more than 140 documented studies undertaken in 20 different countries over the past several decades, fluoridated water adhering to these standards has been scientifically established as safe for drinking.
Another reason to be concerned about intake of fluoridated water is that people are drinking more bottled water, which contains minimal amounts of fluoride.
In-home filtration systems may also eliminate the fluoride in tap water.