Public Works
Phone (805) 388-5373

Water Fluoridation

93343Our imported water provider, Metropolitan Water District of Southern California has joined a majority of the nation's public water suppliers in adding fluoride to drinking water in order to prevent tooth decay. In line with recommendations from the California Department of Public Health, as well as the U.S. Centers for Disease Control and Prevention, Metropolitan adjusts the natural fluoride level in the water, which ranges from 0.1 to 0.4 parts per million, to the optimal range for dental health of 0.7 to 0.8 parts per million.

• Fluoride is a naturally occurring mineral found both in surface water (water from snowmelt, rivers and streams) as well as groundwater.

• Fluoride's benefits for teeth were discovered in the 1930s by scientists who saw extremely low tooth decay rates among people whose water supplies had a significant amount of natural fluoride.

• Fluoride helps teeth resist decay by strengthening the protective layer of tooth enamel, and can reverse newly formed cavities.

• Fluoride has been added to U.S. drinking water supplies since 1945.

• Of the 50 largest cities in the U.S., 43 fluoridate their drinking water.

• The benefits of fluoride in drinking water have been observed in numerous studies and have been shown for people of all ages. Reductions in the rate of tooth decay in fluoridated communities have ranged from 30 to 60 percent for baby teeth, from 20 to 40 percent for teeth of children from 8 to 12 years old and from 15 to 35 percent for teenagers, adults and seniors.


Please see the documents Fluoridation at a Glance and Fluoridation FAQ for more information.