What is Nonpoint source pollution?

Nonpoint source pollution is a type of environmental pollution that comes from diffuse sources, as opposed to a single, identifiable source. It is an environmental issue because it is caused by multiple unregulated sources of pollution that are usually difficult to control, monitor, and manage. Such sources can include runoff from rain or snowmelt containing pollutants, such as sediment, pesticides, fertilizers, failing septic systems, and other pollutants from domestic, industrial, agricultural, and urban activities. These pollutants can have negative impacts to aquatic ecosystems, such as harming fish, contaminating drinking water, and reducing water quality.