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Phosphorus ag source8/18/2023 ![]() ![]() For example, at least one pesticide was found in about 94 percent of water samples and in more than 90 percent of fish samples taken from streams across the Nation, and in nearly 60 percent of shallow wells sampled. Pesticides are widespread in surface water and groundwater across the United States. About a half million tons of pesticides, 12 million tons of nitrogen, and 4 million tons of phosphorus fertilizer are applied annually to crops in the continental United States. Read about the connections between agriculture and water quality.Īgriculture is the leading source of impairments in the Nation’s rivers and lakes. Oftentimes these modifications have unintended environmental impacts on receiving waters and their ecosystems, including changes in water quality and quantity. Additionally, when land is converted to agricultural use, it is modified to be optimized for agricultural production. Fertilizers and pesticides don't remain stationary on the landscape where they are applied runoff and infiltration transport these contaminants into local streams, rives, and groundwater. pesticides, including herbicides, insecticides, and fungicidesĪgricultural contaminants can impair the quality of surface water and groundwater.nutrients, such as nitrogen and phosphorus. ![]() A farmer applies fertilizer on a new agricultural crop.ĪGRICULTURAL CONTAMINANTS IN WATER RESOURCESĪgricultural contaminants commonly studied by the USGS include:
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