Which is an example of Nonpoint Sources?

• A. Factories, oil wells, and animal feedlots
• B. Nitrate Standards
• C. Organic Chemicals
• D. Runoff from croplands and logged forests

Answer: (D)

Nonpoint source pollution comes from broad areas rather than a single outlet, with rainfall or irrigation runoff picking up pollutants as it moves across land and delivering them to rivers and lakes. Runoff from croplands and logged forests fits this pattern because fertilizers, pesticides, sediments, and other materials are mobilized over large areas and carried into waterways during rain events. This diffuse, landscape-scale input contrasts with point sources, which discharge from a specific, identifiable location. A regulatory standard like nitrate standards isn’t a source itself, and organic chemicals describe pollutants that can originate from many different sources, not a single diffuse source. So the best example of nonpoint source pollution is runoff from croplands and logged forests.