At least one pesticide has been detected in water from all the streams in a study. Pesticide compounds were found at nearly all times of the year in about 19 of every 20 streams with agricultural, urban or mixed land-use watersheds, the agency said. The most frequent occurrence was in shallow ground water beneath agricultural and urban areas, where more than half the wells contained one or more pesticide compounds.
Jay Feldman, executive director of Beyond Pesticides, a national research and advocacy group, said the data surrounding the nation's reliance on about 1 billion pounds of pesticides a year "shows an urgent need to strengthen policies at all levels of government and curtail pesticide use."
The USGS report is based on an analysis of data from 51 major river basins and aquifer systems nationally, and a study of an aquifer system that runs through eight states from South Dakota to Texas, east of the Rocky Mountains.
It found that concentrations of individual pesticides nearly always complied with Environmental Protection Agency drinking-water standards, though no water samples from streams were taken at drinking-water intakes.
EPA also is responsible for reviewing pesticides, based on pesticide-makers' tests that can cost tens of millions of dollars. It typically takes up to a decade to study each one before it can reach the marketplace, according to industry figures.
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