Nonpoint Source Pollution
NPS Pollution is caused by rainfall or snowmelt moving over and through the ground. As the runoff moves, it accumulates natural and human-made pollutants eventually depositing them into lakes, rivers, wetlands, coastal waters, and ground waters. Nonpoint source pollution can include: excess fertilizers, herbicides, and insecticides from rural areas or agricultural lands; oil, grease, and toxic chemicals from urban runoff and energy production; sediment from improperly managed construction sites, crop and forest lands, and eroding stream banks; salt from irrigation practices and acid drainage from abandoned mines; bacteria and nutrients from livestock, pet wastes, and faulty septic systems; and atmospheric deposition and hydromodification, or the alteration of the natural flow of water through a landscape.