What is the definition of nonpoint source pollution?

Nonpoint source pollution is defined as pollution that originates from diffuse sources rather than a single, identifiable point. This type of pollution is often associated with agricultural runoff, where rainwater or snowmelt washes away fertilizers, pesticides, sediment, and other contaminants from fields into nearby surface waters. Because nonpoint sources are spread over a large area and do not come from a single identifiable source, it can be more challenging to manage and regulate compared to point source pollution, which can be traced back to a specific site or facility.

It is important to understand that nonpoint source pollution can arise from various land uses, including urban areas, forests, and agricultural lands, making it a significant concern for water quality and environmental health. This type of pollution is cumulative, and its impacts can vary depending on land use, weather events, and management practices.