What is the MCL for nitrate in drinking water?

The maximum contaminant level (MCL) for nitrate in drinking water is set at 10 parts per million (ppm). This standard is established by the Environmental Protection Agency (EPA) to protect public health, particularly for populations that are vulnerable, such as infants and pregnant women. High levels of nitrate in drinking water can lead to health concerns, including methemoglobinemia, or "blue baby syndrome," which affects the ability of blood to carry oxygen in infants.

Setting the MCL at 10 ppm helps ensure that drinking water remains safe and reduces the risk of adverse health effects associated with elevated nitrate levels. Therefore, understanding the significance of this standard is crucial for water operators and regulators in maintaining water quality and safety for the community.