• Fluoridation FAQ


City Hall
456 W. Olive Ave.
Sunnyvale, CA 94086

Mailing address:
Public Works/Field Services
ATTN: Water
P.O. Box 3707
Sunnyvale, CA 94088-3707

Phone: (408) 730-7900
Fax: (408) 730-7286

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Fluoridation FAQ

Q. What is fluoride?

Fluoride is an abundant, naturally-occurring element found in rocks, soil and fresh and ocean water. Fluoride protects people of all ages against tooth decay. It makes teeth stronger and harder, so they last longer.

Q. Why fluoridate drinking water?

  • When fluoride is present in drinking water at optimal levels, it has been shown to dramatically improve oral health by preventing tooth decay.
  • The amount of natural fluoride in the San Francisco Public Utilities Commission (SFPUC) water sources is not enough to provide oral health benefits. Water fluoridation is the addition of small amounts of fluoride to a water supply to achieve the optimal fluoride level that helps prevent tooth decay.
  • Fluoridated water benefits the entire community, children and adults of all ages, especially low-income and underserved populations.
  • California law requires larger water distributors to fluoridate the water supply, as funding becomes available.

Q. What should I do when the fluoridation program starts?

You do not need to make any changes to your drinking water habits. Fluoride will not change the taste, smell, or appearance of your drinking water. If you are in the area of Sunnyvale that will receive fluoridated water, health experts advise that if you are taking prescription fluoride supplements, either tablets or drops, you MUST stop once you begin receiving fluoridated water.

Q. How much fluoride will be added to my water?

The SFPUC will supplement naturally-occurring fluoride in your drinking water to meet the levels recommended by the California Department of Health Services (1 part per million, or 1.0 milligram of fluoride per liter of water). This level of concentration is recommended by the United States Centers for Disease Control and Prevention (CDC).

The chemical used by the SFPUC for water fluoridation is suitable for drinking water use. (It complies with the drinking water additives requirements Section 64700, Title 22, of California Code of Regulations, and has been tested and certified as meeting the specifications of American National Standards Institute/National Sanitation Foundation Standard 60.)

Q. Can you give an example of "parts per million" (ppm)?

One drop of fluoride in one million drops, or 50 liters of water. Because there are 3.78 liters in a gallon, one part per million is the same as one drop of a substance in about 13.2 gallons of water. It is also the same as one inch in 16 miles; one cent in $10,000; one ounce of salt in 62,500 pounds; one ounce of oil in 7,812.5 gallons.

Q. Why isn’t all the water in Sunnyvale fluoridated?

Although the SFPUC has chosen to fluoridate all the water they provide, including that purchased by Sunnyvale, that only accounts for approximately 45 percent of the City’s supply, all on the north part of the City. The City of Sunnyvale does not plan to fluoridate the other sources of water it uses, since the capital and operational costs associated with fluoridating the water received from Santa Clara Valley Water District (SCVWD) and from City wells is cost-prohibitive.

California state law requires a water system such as the City of Sunnyvale’s or the SCVWD to fluoridate its water once funding is available. To date, funding has not been available from the state, and until it is, potable water in Sunnyvale will not be fluoridated in the entire City.

Q. Is fluoride safe?

Fluoride in levels administered for drinking water is safe for humans and all animals.

More than 50 years of research and experience have shown that fluoridation at optimal levels is safe for people and the environment. Leading scientists and health professionals, numerous professional organizations, and governments around the world support community water fluoridation.

Q. If I have a water filter, is it removing the fluoride?

To find out if fluoride is removed, check with the filter manufacturer. However, most water filters do not remove fluoride. The most effective way to remove fluoride from a household supply is by reverse osmosis filtering with up to 80 to 90 percent efficiency. Water distillation systems remove up to 100 percent of fluoride, and bottled water does not generally contain fluoride. Consumers should check bottled water labels to find out if the water contains fluoride or not.

Q. What if my child has been receiving fluoride drops or tablets?

The California Department of Health Services and health professionals recommend that prescription fluoride supplements be stopped if a child lives or goes to school in a community that receives fluoridated water. Parents should check with the pediatrician or dentist who prescribed the supplements.

Q. What do health professionals say about fluoride?

Health experts endorse water fluoridation as the single, most effective public health measure to improve oral health. Through more than 50 years of extensive research, drinking fluoridated water has been scientifically proven to be safe and effective. The following organizations endorse water fluoridation as an important public health measure for reducing tooth decay.

  • The American Dental Association (ADA) endorsed fluoridation in 1950, and reaffirmed its endorsement in 1997.
  • The American Medical Association (AMA) endorsed fluoridation in 1950, and reaffirmed its endorsement in 1996.
  • The American Water Works Association (AWWA) endorsed fluoridation in 1976, and reaffirmed its endorsement in 1982.
  • The San Francisco, San Mateo, Santa Clara and Alameda county public health departments have all endorsed the SFPUC water fluoridation program.
  • The California Department of Health Services has approved the SFPUC fluoridation program.

Q. How can I learn more about water fluoridation?

  • For information on fluoride in your drinking water, visit the SFPUC on line at www.sfwater.org/fluoride, or call (866) 668-6008.
  • For specific information on City water system, call Sunnyvale Department of Environmental Services at (408) 730-7900,
    TDD (408) 730-7501.
  • For health-related information, contact the Santa Clara County Department of Public Health at (408) 885-3980.

More information is available on the following Web sites:

American Dental Association


California Department of Health Services


Centers for Disease Control


North Coast Fluoride Information Network



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