ABSTRACT
Toxic pesticides and their transformation products are a concern from the standpoint of human health. They are also a risk to the environment in areas where contaminated groundwater enters surface water. There is a need to evaluate the environmental cost/benefit of safer product replacements used in conjunction with genetically altered crops. As new products are registered to replace more persistent and mobile pesticides, long-term fate studies on groundwater quality, including monitoring of the effect of transformation product, are necessary.
