Discharges from a single pipe into a river are an example of what kind of pollution source?

• A. Non-point Source
• B. Diffuse Source
• C. Local Source
• D. Point Source

Answer: (D)

A single pipe discharging into a river is a source that can be traced to one fixed location. That makes it a point source: pollutants enter the water through a distinct outlet, which can be identified, monitored, and regulated. Non-point or diffuse sources involve pollutants from many different places across a landscape, like runoff from roads and fields, so you can’t pinpoint a single entry point. The term “local source” isn’t the standard descriptor used here. So the best description is a point source because the discharge comes from one identifiable outlet.