On the need for a National (U.S.) research program to elucidate the potential risks to human health and the environment posed by contaminants of emerging concern.

Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States Leetown Science Center, U.S. Geological Survey, Kearneysville, West Virginia 25430, United States School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, Arizona 85287, United States Great Lakes WATER Institute, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53204, United States Iowa Water Science Center, U.S. Geological Survey, Iowa City, Iowa 52244, United States Lowell Center for Sustainable Production, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, United States Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States Department of Biology, University of St. Thomas, Saint Paul, Minnesota 55105, United States Department of Biology, North Carolina State University, Raleigh, North Carolina 27695, United States Department of Chemical and Environmental Engineering, University of Arizona, Tucson, Arizona 85721, United States Division of Biological Sciences, University of Missouri-Columbia, Columbia, Missouri 65211, United States Product Safety & Regulatory Affairs, Procter & Gamble, Cincinnati, Ohio 45201, United States Humphrey Institute of Public Affairs, University of Minnesota, Minneapolis, Minnesota 55455, United States