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

The Maximum Contaminant Level (MCL) for nitrates, specifically in the form of nitrate-nitrogen, is set at 10 milligrams per liter (mg/L). This standard is established by the Environmental Protection Agency (EPA) to safeguard public health, particularly for vulnerable populations such as infants and pregnant women, who are at higher risk from elevated nitrate levels. Nitrates in drinking water can interfere with the blood's ability to transport oxygen, leading to conditions like methemoglobinemia, commonly known as "blue baby syndrome."

By setting the MCL at 10 mg/L, regulatory agencies aim to minimize the risk of significant health issues while considering feasible technological measures for water treatment. This level is a crucial benchmark for utilities in their water quality monitoring and management practices, ensuring the safety of their drinking water supply. Understanding this standard helps utilities maintenance workers maintain compliance and protect community health effectively.