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

Point source pollution refers to contaminants that enter a water body from a single identifiable source or location. This type of pollution is characterized by its specific source, making it easier to monitor and regulate compared to non-point source pollution, which is diffuse and comes from multiple sources.

The discharge from a sewage treatment plant is a clear example of point source pollution because it comes from a defined outlet, such as a pipe, where treated wastewater is released directly into a water body. This specific point can be monitored and measured, allowing for better management and regulation of the pollutant levels being discharged, including nutrients, pathogens, and other contaminants that may affect water quality.

In contrast, runoff from fields, stormwater runoff, and septic system leachate are examples of non-point source pollution, as they do not originate from a single identifiable source and can carry pollutants over a wide area, making them more complex to manage and control.