A significant increase in nitrate nitrogen concentration in water likely indicates what?

A significant increase in nitrate nitrogen concentration in water is closely associated with contamination, particularly from agricultural runoff or wastewater discharge. Nitrates are a common pollutant that can originate from fertilizers, animal waste, or sewage. When you see elevated levels of nitrate nitrogen, it often indicates that these sources have compromised water quality, leading to potential health risks for both humans and aquatic ecosystems.

Contamination in this context reflects how external substances have entered the water supply, altering its natural composition. High nitrate levels can lead to problems such as eutrophication, which can deplete oxygen in water bodies and harm aquatic life. This understanding is crucial when evaluating water quality and the potential sources of pollution in a specific environment.