Health Effects Support Document for 1,1-Dichloro-2,2-bis (p-chlorophenyl)ethylene (DDE), January 2008

摘要

The U.S. Environmental Protection Agency (EPA) has prepared this Health Effects Support Document for 1,1-Dichloro-2,2-bis (p-chlorophenyl)ethylene (DDE) to assist in determining whether to regulate DDE with a National Primary Drinking Water Regulation (NPDWR). The available data on occurrence, exposure, and other risk considerations suggest that, because DDE does not occur in public water systems at frequencies and levels of public health concern, regulating DDE will not present a meaningful opportunity to reduce health risk. EPA will present a determination and further analysis in the Federal Register Notice covering the Contaminant Candidate List (CCL) regulatory determinations. DDE (Chemical Abstracts Services Registry Number 72-55-9) has never been produced commercially, but is a primary environmental and metabolic degradation product of the pesticide DDT. Although all uses of DDT in the U.S. were cancelled on January 1, 1973, DDT and DDE remain in the environment because they are persistent and bioaccumulative. Also, DDT is still used in other parts of the world.