Which type of pollution is described as nutrients entering waterways from diffuse sources such as agricultural runoff?

Which type of pollution is described as nutrients entering waterways from diffuse sources such as agricultural runoff?

• A. Nonpoint-source nutrient pollution
• B. Point-source pollution
• C. Chemical pollution
• D. Thermal pollution

Answer: (A)

Nonpoint-source nutrient pollution occurs when nutrients, mainly nitrogen and phosphorus, enter waterways from many diffuse sources rather than a single discharge point. Agricultural fields, fertilizers, manure, and soil carried by runoff during rain events wash into streams and rivers over large areas. Because there isn’t a defined outlet you can pinpoint, this type of pollution is characterized as diffuse or nonpoint-source. It often leads to eutrophication—excessive algae growth and depleted oxygen—that harms aquatic ecosystems and water quality. In contrast, pollutants from a distinct pipe or outlet come from point-source pollution, while thermal pollution involves temperature changes and chemical pollution covers a broad range of contaminants.

Nonpoint-source nutrient pollution occurs when nutrients, mainly nitrogen and phosphorus, enter waterways from many diffuse sources rather than a single discharge point. Agricultural fields, fertilizers, manure, and soil carried by runoff during rain events wash into streams and rivers over large areas. Because there isn’t a defined outlet you can pinpoint, this type of pollution is characterized as diffuse or nonpoint-source. It often leads to eutrophication—excessive algae growth and depleted oxygen—that harms aquatic ecosystems and water quality. In contrast, pollutants from a distinct pipe or outlet come from point-source pollution, while thermal pollution involves temperature changes and chemical pollution covers a broad range of contaminants.