Water Quality Analyst Practice Test

High nitrate levels in drinking water can lead to methemoglobinemia, commonly known as "blue baby syndrome," particularly in infants. This condition occurs when nitrate is converted to nitrite in the body, which then reacts with hemoglobin in red blood cells. The conversion creates methemoglobin, a form of hemoglobin that is unable to carry oxygen effectively. As a result, infants exposed to high nitrate levels can experience reduced oxygen delivery to tissues, leading to symptoms such as a bluish discoloration of the skin, respiratory distress, and in severe cases, it can be life-threatening if not treated promptly.

While other health effects, such as kidney failure, severe allergic reactions, and stomach ulcers, could arise from various contaminants or conditions, they are not directly linked to high nitrate concentrations in drinking water. Focusing on the specific relationship between high nitrate levels and methemoglobinemia underscores the critical nature of monitoring and regulating nitrate levels to protect vulnerable populations, notably infants who are more susceptible to the adverse impacts of elevated nitrates.