nonpoint sources, definition of

Sources of pollution that do not originate at the point where pollution is detected, e.g.: agricultural runoff: precipitation and irrigation-related runoff of animal wastes and pesticides from crop and pasture lands. feedlot runoff: primarily precipitation-related discharge of animal wastes from concentrated livestock feeding areas. individual wastewater treatment system runoff: discharge of partially treated sewage from malfunctioning on-site septic systems. urban runoff: precipitation-related discharge of septic leachate, animal wastes, etc. from impervious surfaces, lawns, and other urban land uses. wildlife runoff: precipitation-related runoff of animal wastes from areas with high concentrations of wildlife (e.g., waterfowl).