Which of the following is an example of a point source of pollution?

• A. Factories, oil wells, and animal feedlots
• B. Pollution from broad, diffuse areas
• C. Rain washes pollutants into surface water
• D. Runoff from croplands and logged forests

Answer: (A)

Point source pollution comes from a single, identifiable discharge point, such as a pipe or outlet where pollutants are released into a water body. The example listing factories, oil wells, and animal feedlots fits this description because each facility can have a specific outlet that emits pollutants, making the source traceable and localized. In contrast, pollution from broad, diffuse areas is nonpoint source because there isn’t one distinct discharge; pollutants enter water from many places across a landscape. Rain washing pollutants into surface water shows a process that carries contaminants from widespread areas rather than a single outflow, and runoff from croplands and logged forests is similarly diffuse. Because point sources are identifiable and located at a definite point, they’re typically subject to permits and direct regulation, while nonpoint sources are spread across large areas and are harder to control.