Fluoride can occur in drinking water naturally as a result of the geological composition of soils and bedrock. Community water systems are required to ensure that levels of fluoride in their drinking water are less than 4.0 mg/L in order to be in compliance with EPA drinking water regulations. If your water system has naturally-occurring fluoride above this level, the EPA requires systems to take action to reduce it. If you want the most up-to-date information about the current fluoride level in your water, contact your local water supplier directly.
Doesn't fluoride occur naturally in water? What if my water system has naturally-occurring fluoride above 4.0 mg/L?
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