What is the maximum level of fluoride in mg/l allowed in drinking water without public notice?

The correct answer is based on regulatory guidelines regarding fluoride levels in drinking water. The maximum allowable concentration of fluoride in drinking water without the need for public notification is set at 2.0 mg/l. This level is established by the U.S. Environmental Protection Agency (EPA) to ensure that fluoride, known for its dental health benefits, is present in safe amounts that do not pose a health risk to consumers. Levels above this threshold may require public notification due to potential health effects, particularly in vulnerable populations. Maintaining fluoride within these limits is crucial for balancing the dental health benefits while minimizing risks associated with excessive fluoride consumption.