What is a nonpoint source of pollution?

A nonpoint source of pollution refers to pollution that does not originate from a single, identifiable source but instead comes from various diffuse sources. This type of pollution is often associated with runoff, seepage, or leaching into the soil, where contaminants accumulate and can eventually reach water bodies. For example, when rainfall or melting snow flows over land surfaces, it can pick up and transport pollutants such as fertilizers, pesticides, or sediments from agricultural fields, urban areas, and other landscapes.

This characteristic makes nonpoint source pollution more challenging to manage compared to point source pollution, which can be traced back to a specific location, such as a pipe discharging wastewater. Nonpoint sources require broader management strategies, including land use planning and best management practices to mitigate their impacts on water quality. Understanding nonpoint sources is essential for effective pollution prevention and environmental protection efforts.