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Estimated concentrations of atrazine in agricultural groundwater
f the most extensively used herbicides in the United States, with average annual use over 70 million pounds � primarily for corn and sorghum. The U.S.
Probabilities of high concentrations are lower across much of the Corn Belt, where atrazine use is greatest, but soils tend to be poorly drained and often require artificial drainage that diverts recharge from groundwater to nearby streams. These findings are based on statistical models developed from almost 20 years of nation-wide monitoring data collected by the U.S. Geological Survey�s National Water Quality Assessment Program. For further details, see Stackelberg, P.E., Barbash, J.E., Gilliom, R.J., Stone, W.W., and Wolock, D.M., 2012, Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States.
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