What is the MCL for Nitrate in drinking water?

The maximum contaminant level (MCL) for nitrate in drinking water is set at 10 mg/L. This standard is established by the Environmental Protection Agency (EPA) as a protective measure for public health, particularly because elevated levels of nitrate can lead to health issues such as methemoglobinemia, or "blue baby syndrome," in infants.

The significance of limiting nitrate concentrations to this level stems from its potential impact on oxygen transport in the blood in vulnerable populations, particularly infants under six months of age. Therefore, the MCL is designed to ensure that drinking water remains safe and consumable for all demographics, especially the most sensitive groups.

Levels of nitrate above 10 mg/L could pose serious health risks, which highlights the importance of monitoring and maintaining water quality regulations. Thus, the choice of 10 mg/L as the MCL reflects a careful balance between practicality and health safety.