Which of the following is a consequence of point source pollution?

Point source pollution refers to pollutants that originate from a single, identifiable source, such as a wastewater discharge pipe, a factory effluent outlet, or a sewer system. The defining characteristic of point source pollution is that it can typically be traced back to one specific location, which leads to a more localized impact on the environment. This means that the pollution has its greatest effects in the immediate vicinity of the source, while areas further away may not experience significant changes in water quality or ecosystems.

Given this context, the localized impact on the environment accurately describes one of the main consequences of point source pollution. In contrast, widespread contamination, unmeasured pollution, and high population density relate more to other types of pollution or environmental issues, not specifically to the concentrated nature of point source pollution. Thus, understanding that point source pollution leads to localized effects is key for managing and mitigating its environmental impact.