Water fluoridation is the process in which fluoride is added to public drinking water to reach an optimum level in order to prevent tooth decay. The Environmental Protection Agency recommends a level of fluoride no greater than 4 mg/L or 4 ppm in the water. According to the American Dental Association, 1.0 ppm is the optimum level of fluoride necessary to prevent tooth decay. The Centers for Disease Control and Prevention states "The most inexpensive way to deliver the benefits of fluoride to all residents of a community is through water fluoridation."
The Centers for Disease Control and Prevention report community water fluoridation statistics every two years. According to their report, in 2008, 195,545,109 of the 269,911,707 people on public drinking water systems in the United States were receiving fluoridated water. That number represents 72.4% of the population in the United States receiving fluoridated water via fluoridated water systems. 64.3% of the population are receiving fluoridated water in other means.
American Dental Association. Statement on Water Fluoridation Efficacy and Safety. http://www.ada.org/2109.aspx. Accessed October 27, 2010.
Centers for Disease Control and Prevention. Community Water Fluoridation - Background Information. http://www.cdc.gov/fluoridation/benefits/background.htm. Accessed October 27, 2010.
Centers for Disease Control and Prevention. 2008 Water Fluoridation Statistics. http://www.cdc.gov/fluoridation/statistics/2008stats.htm. Accessed October 27, 2010.
Environmental Protection Agency. Basic Information About Fluoride in Drinking Water. http://water.epa.gov/drink/contaminants/basicinformation/fluoride.cfm. Accessed October 27, 2010.