What is the MCL for fluoride in drinking water?

The Maximum Contaminant Level (MCL) for fluoride in drinking water is indeed set at 4.0 mg/L. This standard is established by the Environmental Protection Agency (EPA) to protect public health. Fluoride, while beneficial for dental health in small amounts, can pose health risks at higher concentrations.

An MCL of 4.0 mg/L is established to mitigate the risk of dental and skeletal fluorosis, both of which can occur due to excessive exposure to fluoride. Monitoring and maintaining fluoride levels in drinking water are crucial to ensure that the benefits are realized without the associated health risks that come from elevated fluoride levels.