These United States Geological Survey (USGS) publications cover issues surrounding trace elements found in streams, ground water, reservoir bed sediment, fish tissue, and clam tissue across the US. The research is part of the National Water Quality Assessment program (NAWQA), which studies 31 metals and radionuclides present in our nations water resources. These include arsenic, lead, zinc, radon, and mercury, among others. Contaminant sources, concentrations, and distributions are foci of the research. This site includes the latest news, data sets, publications, links to more information, as well as current and past studies surrounding the issue of trace elements in our water resources.
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