Which substance is often tested in drinking water to ensure safety?

Nitrates are commonly tested in drinking water because their presence can indicate contamination from agricultural runoff, septic systems, or other sources of pollution. High levels of nitrates in drinking water can pose serious health risks, particularly to infants, as they can lead to a condition known as methemoglobinemia, or "blue baby syndrome," which affects the blood's ability to carry oxygen.

Regular monitoring of nitrate levels helps ensure that drinking water is safe and meets public health standards. Understanding the implications of nitrate contamination is crucial for protecting water resources and public health, making it an important parameter in water quality testing.

While other substances like chlorine, ammonia, and carbon dioxide may also be tested for various reasons—such as for disinfection, nutrient levels, or water chemistry—they do not present the same specific public health risks associated with elevated nitrates in drinking water.