What is the Maximum Contaminant Level (MCL) for nitrates in drinking water?

The Maximum Contaminant Level (MCL) for nitrates in drinking water is established at 10 mg/l, which is the standard set by the Environmental Protection Agency (EPA). This level is based on health considerations; high concentrations of nitrates can cause serious health issues, particularly in infants, leading to conditions such as methemoglobinemia, or "blue baby syndrome," which affects the ability of blood to carry oxygen.

Setting the MCL at 10 mg/l aims to protect sensitive populations and ensure safe drinking water. The regulatory framework is designed to minimize health risks while considering the feasibility of compliance for public water systems. Understanding this standard helps to highlight the importance of monitoring and protecting water quality to safeguard public health.