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The Metropolitan Water District of Southern California (MWD) began adding fluoride to the drinking water processed at its five treatment plants beginning Monday, October 29, 2007. The treatment plant that serves Orange County and the Anaheim area began fluoridating on November 19, 2007.


MWD treated water typically provides about 15% of Anaheim’s water supply. MWD water is received at seven interconnection points in Anaheim, with the amount of water delivered dependent on consumer demand and the availability of Anaheim’s other supplies. Most of Anaheim’s customers receive some MWD treated water, but most of their water comes from Anaheim’s other sources.


MWD chose to fluoridate because the County Health Officers of the six counties where MWD provides water requested it. It is the position of the County Health Officers, the Centers for Disease Control, the California Dental Association, the State of California, and several other health organizations, that fluoride, in the proper dosage, is a benefit to dental health.


MWD will adjust the naturally occurring fluoride level in water, which ranges from 0.1 to 0.4 parts per million (ppm), to the optimal range for dental health of 0.7 to 0.8 ppm as determined by the California Department of Public Health. Anaheim’s groundwater typically contains between 0.3 and 0.4 ppm of naturally occurring fluoride. Anaheim does not intend to fluoridate its other water supplies.


More information is available about MWD's fluoridation project on its Web site at http://www.mwdh2o.com/fluoridation/index.html.


To learn more about Anaheim Public Utilities' water quality check out our Water Quality Web page.


Updated November 17, 2014