What is the Maximum Contaminant Level (MCL) for fluoride in drinking water?

The Maximum Contaminant Level (MCL) for fluoride in drinking water is set at 4 mg/L. This standard is established by the United States Environmental Protection Agency (EPA) to protect public health. Fluoride can be beneficial for dental health in small amounts, but excessive exposure may lead to dental fluorosis or other health issues. The MCL represents the maximum allowable concentration of fluoride that can be present in drinking water without posing a significant risk to health. Therefore, the correct value is 4 mg/L, which is designed to balance the benefits of fluoride in preventing tooth decay against the potential risks associated with higher concentrations.