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Organochlorine pesticides are man-made organic chemicals that have been used to control everything from fungus to grasshoppers. DDT was the first that was used on a large scale in the U.S.; it was heavily applied in agricultural regions. Most organochlorine pesticides are no longer sold for use in the U.S. PCBs are not pesticides but do have many of the same properties. They are by-products and constituents of a variety of industrial products, such as electrical transformers.

Organochlorine Pesticides and PCBs in Aquatic Ecosystems of the Central Columbia Plateau