Atrazine in water comes from atrazine currently being probably the most widely used herbicide in the U.S. It is routinely found in surface water and ground water, especially in agricultural areas, like the Midwest. More than 70 percent of all cornfields in the United States are sprayed with atrazine on a yearly basis, leading to atrazine in drinking water used by 1000s of households. There was also a measurably lower amount of estrogen in the Illinois women during parts of their cycle. This is not necessarily associated with an irregular menstrual cycle after birth among these women, nevertheless the menstrual cycle irregular bleeding is quite worrisome.