To argue that the concentrations reported in this study are environmentally relevant is misleading. Those concentrations are usually in groundwater, not surface waters. I’ve been involved in the environmental field for almost 20 years and have yet to hear of any fish being caught in groundwater.

John Harris
Sacramento, Calif.

Study coauthor Frank von Hippel notes that much of the nation’s water supply comes from groundwater and says that “groundwater flows just like surface water and, in many places, becomes surface water.” —J. Raloff

From the Nature Index

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