The study included data from two Iowa watersheds — the Nishnabotna River in western Iowa, where 82 percent of samples taken contained atrazine, and Wolf Creek in Black Hawk and Grundy counties where 96 percent of samples taken contained atrazine. In Wolf Creek samples, the maximum peak atrazine concentration was 10 parts per billion (ppb), more than three times the EPA standard atrazine level for drinking water.
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