Pesticides persist in ground water
Numerous studies over the past four decades have established that pesticides, which are typically applied at the land surface, can move downward to reach the water table at detectable concentrations. The downward movement of pesticide degradation products can also contribute to the contamination of ground water. This study found that the pesticides and degradation products detected most frequently in shallow ground-water samples were predominantly from two classes of herbicides — triazines and chloroacetanilides.
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