Fluoride can occur in drinking water naturally as a result of the geological composition of soils and bedrock. Some areas of the country have high levels of naturally occurring fluoride which can dissolve easily into ground water as it moves through gaps and pore spaces between rocks. Fluoride can also be added to public drinking water supplies as a public health measure for reducing cavities among the treated population. Fluoridation is not required by EPA, which is prohibited by the Safe Drinking Water Act from requiring the addition of any substance to drinking water for preventive health care purposes. The Centers for Disease Control and Prevention (CDC) provides recommendations about the optimal levels of fluoride in drinking water in order to prevent tooth decay. The decision whether or not to add fluoride to drinking water is made on a local basis. Consumers served by public water systems who wish to learn about fluoridation of their drinking water can visit the Centers for Disease Control and Prevention (CDC) My Water's Fluoride (MWF) Web site at https://nccd.cdc.gov/DOH_MWF/Default/Default.aspx .
How does fluoride get into tap water?
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