CCA Ontario Soil & Water Quality Practice Exam Prep – Practice Test & Study Guide

The acceptable level of nitrates in drinking water for infants is set at 10 mg per liter. This standard is based on health guidelines that aim to protect vulnerable populations, particularly infants, from the harmful effects of nitrates. Infants under six months of age are at risk for a condition known as methemoglobinemia, or "blue baby syndrome," which can occur when nitrates in drinking water are converted to nitrites in the body, impairing the blood's ability to carry oxygen.

The limit of 10 mg per liter is established to minimize any potential health risks associated with elevated nitrate levels. Nitrate concentrations above this threshold could lead to significant health concerns for infants, particularly regarding their respiratory health. This regulatory limit is crucial for ensuring safe drinking water, protecting public health, especially in sensitive populations.

In contrast, the higher levels of 20 mg, 30 mg, or even the lower level of 5 mg per liter do not provide a suitable margin of safety for infants, further emphasizing the importance of adhering to the established limit of 10 mg per liter for their well-being.