Which of the following is NOT considered a point source discharge?

In the context of water pollution and regulatory frameworks, a point source discharge refers to a specific, identifiable source of pollutants that can be traced back to a single location. This definition typically includes discharges that come through a discernible conveyance such as a pipe, channel, or conduit.

Pipes, channels, and conduits are all specific structures designed to transport water or wastewater directly from a single point, making them classic examples of point sources. They are often associated with direct discharges into water bodies, and regulatory agencies monitor these to control and minimize pollution.

On the other hand, streams are not considered point sources because they represent a broader and more diffuse system of flowing water. Streams can collect runoff from surrounding areas, including agricultural lands, urban environments, and other non-point sources. They do not originate from a single identifiable source but rather are a cumulative result of multiple inputs across a larger landscape. This distinction is crucial in regulatory contexts because non-point source pollution is managed differently than point source pollution, often requiring different approaches and mitigation strategies.

Therefore, the correct choice identifies streams as entities that do not fit the definition of point source discharges.