Nitrate levels above what concentration (mg/L) can result in "blue baby" disease?

Nitrate levels above 10 mg/L are considered critical when it comes to the risk of "blue baby" disease, also known as methemoglobinemia. This condition primarily affects infants, particularly those under six months of age, as their bodies are less capable of processing the nitrates that can be converted into nitrites. When higher levels of nitrates are ingested, especially through contaminated drinking water, nitrites can interfere with the ability of blood to carry oxygen, resulting in a bluish tint to the skin.

The 10 mg/L threshold is established by health organizations, including the Environmental Protection Agency (EPA), as a safety standard aimed at protecting vulnerable populations, especially infants. Nitrate levels exceeding this concentration can lead to serious health concerns, emphasizing the importance of monitoring and managing nitrate levels in drinking water sources to prevent this and other related health risks. Ensuring water quality below this level is essential for safeguarding infant health and maintaining public safety standards.