DuPont is the sole manufacturer and principal registrant of the technical ingredient cyanazine in the United States. EPA has classified cyanazine as a possible human carcinogen. The review was based on the Agency's concern that long term exposure to these herbicides in food and drinking water may pose a risk of cancer.
Studies indicate that cyanazine causes cancer in laboratory animals.
In addition, persons exposed through mixing, loading and applying this pesticide may also be at risk of cancer. Numerous ground water and surface water studies have show the presence of the triazines in drinking water, especially during the spring and summer in Midwest agricultural areas. The Special Review of atrazine and simazine will continue. Cyanazine is a herbicide used on corn, cotton and sorghum to control broadleaf weeds and grasses. An estimated 95 percent is used on corn.