What is the MCL for Nitrite in drinking water?

The maximum contaminant level (MCL) for nitrite in drinking water is established at 1 mg/L. This standard is set to protect public health, particularly because nitrite can interfere with the ability of blood to carry oxygen, leading to conditions such as methemoglobinemia or "blue baby syndrome" in infants.

Regulatory bodies, such as the Environmental Protection Agency (EPA), have identified this threshold based on extensive research linking higher concentrations of nitrite to adverse health effects. This is crucial for water treatment operators to monitor, ensuring that drinking water remains safe for consumption. Maintaining nitrite levels below the MCL helps safeguard vulnerable populations, particularly infants and pregnant women who are at higher risk for the associated health effects.