Some of the pesticides inscribed into the Illinois landscape are hormonally active—even at vanishingly small concentrations. One of these is atrazine, which has been variously linked, in animal studies, to increased estrogen production, birth defects, sexual ambiguity, disrupted ovulation, and altered breast development.

[…]

Atrazine remains the most frequently detected pesticide in water throughout the United States, found in three of every four American streams and rivers and 40 percent of all groundwater samples.

Sandra Steingraber. Living Downstream: An Ecologist’s Personal Investigation of Cancer and the Environment. Da Capo Press. Kindle Edition. Pg. 5, 7.

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