Does fluoride occur naturally in water? What if my water system has naturally-occurring fluoride above 4.0 mg/L?

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 ppm 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.

Visit the CDC’s website “My Water’s Fluoride” section, to find information on your water system’s fluoridation status.

Another way to find the fluoride level of your local public water system is to contact your water utility provider for more information. Consumers can find the name and contact information of the water utility on their water bill.