What is the required range of fluoride in mg/l to be in compliance with Illinois Department of Public Health regulations?

The correct range of fluoride concentration in drinking water for compliance with Illinois Department of Public Health regulations is 0.7 to 1.2 mg/l. This standard is established to balance the benefits of fluoride in preventing dental cavities while minimizing the risk of dental fluorosis, which can occur from excessive fluoride exposure.

Setting the fluoride concentration within this range helps to ensure that public health initiatives promoting dental health are effective without causing unintended harm to the population. Fluoride is beneficial in small, controlled amounts, making this specified range vital for maintaining the health of the community.

Other options either fall below or exceed this recommended range, which can lead to reduced efficacy in fluoride's protective effects against tooth decay or increase the risk of adverse health effects. It is crucial for water systems to regularly monitor fluoride levels to remain within this established range, ensuring compliance with health regulations and promoting public health.