What is a non-point source?

A non-point source refers to pollution that originates from multiple indirect sources rather than a single, identifiable point. This type of pollution is characterized by its widespread nature, as it does not come from a single location but rather from various sources that collectively contribute to the issue. For example, runoff from agricultural fields, urban areas, or construction sites can all lead to non-point source pollution, where contaminants such as nutrients, sediments, and chemicals are dispersed across the landscape rather than released from a specific facility or point.

The definition emphasizes the challenge in controlling non-point source pollution since it can arise from numerous locations, making it difficult to pinpoint the exact source of contaminants. This contrasts with point source pollution, which is typically easier to manage because it can be traced back to a specific discharge point, like a factory pipe or sewage treatment plant.

In summary, the accurate identification of a non-point source underscores its complexity and the need for comprehensive strategies to monitor and mitigate its effects on water quality.