A new model predicts that atrazine, plus its breakdown product deethylatrazine, has less than a 10% chance of exceeding the U.S. Environmental Protection Agency’s standard for public drinking-water supplies in shallow groundwater in about 95% of the nation’s agricultural areas. Atrazine is a commonly used herbicide for weed control in corn and sorghum production.
“With the intensive, widespread use of the herbicide atrazine in agricultural production, some communities will need to carefully monitor the risk to groundwater and human health from this contaminant and its residues,” said Marcia McNutt, U.S. Geological Survey director. “The advantage of this new research is that it reveals the spatial variability of risk for atrazine contamination in groundwater across the United States, allowing communities to make wise decisions on allocating scarce financial resources for water-quality testing.”
These findings are based on new statistical models developed from almost 20 years of nation-wide water-quality monitoring data collected by the USGS National Water Quality Assessment Program (NAWQA).… Continue readingRead More »