A more detailed description of the occurrence and significance of contaminants in water resources in the Nation can be found in the following reports and on National Water-Quality Assessment (NAWQA) Web Pages
Gilliom, R.J., Barbash, J.E., Kolpin, D.W., and Larson, S.J., 1999, Testing Water quality for Pesticide Pollution, Environmental Science and Technology, vol 33, issue 7, 164A-169A http://pubs.acs.org/hotartcl/est/99/apr/test.html
Nolan, B.T., and Stoner, J.D., 2000, Nutrients in ground waters of the conterminous United States, 1992-1995, Environmental Science and Technology, vol 34, no. 7, p 1156-1165, http://water.usgs.gov/nawqa/nutrients/pubs/est_v34_no7/
Squillace, P.J., Moran, M.J., Lapham, W.W., Price, C.V., Clawges, R.M., and Zogorski, J.S., 1999, Volatile organic compounds in untreated ambient groundwater of the United States, 1985-1995: Environmental Science & Technology, v. 33, no. 23, p. 4176-4187. http://water.usgs.gov/nawqa/vocs/
Zogorski, J,.S., Moran, M.J., and Hamilton, P.A., 2001, MTBE and other volatile organic compounds--New findings and implications on the quality of source waters used for drinking-water supplies: U.S. Geological Survey Fact Sheet FS-105-01, 2 p. http://water.usgs.gov/nawqa/vocs/
National Water-Quality Assessment Program http://water.usgs.gov/nawqa/
Pesticide National Synthesis http://water.usgs.gov/nawqa/pesticides/
Nutrient National Synthesis http://water.usgs.gov/nawqa/nutrients/
VOC National Synthesis http://water.usgs.gov/nawqa/vocs/
Trace element National Synthesis http://water.usgs.gov/nawqa/trace/
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