Liquid and solid wastes from all types of farming, including runoff from pesticides, fertilizers, and feedlots; erosion and dust from plowing; animal manure and carcasses; and crop residues and debris. Agriculture is generally recognized as the leading nonpoint source of water pollutants, such as sediments, nutrients, and pesticides. Among other water pollution problems related to agriculture, nitrate pollution has been of growing concern. Nitrate contamination from agricultural activities has been reported in almost every state in the United States.
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