USGS - science for a changing world

Environmental Health - Toxic Substances


Watershed- and Regional-Scale Contamination

Map of Toxics Program Study Sites
Locations of Toxics Program Watershed- and Regional-Scale Contamination Investigations
(Click on map for larger version)

Map and areal photograph of the Norman Municipal Landfill, OK.
Scientists from the USGS collected groundwater samples for analysis of emerging contaminants upgradient and downgradient of the Norman Municipal Landfill, OK -- from the Emerging Contaminants in the Environment Investigation

The Toxics Program conducts watershed- and regional-scale investigations of legacy, current, and emerging contaminants affecting aquatic ecosystems from common types of nonpoint and distributed point-source contamination. More about watershed- and regional-scale contamination investigations.


Chemical Mixtures and Environmental Effects

Watershed Contamination from Hard-Rock Mining

Pesticide Contamination in Varied Pesticide-Use Settings

Emerging Contaminants in the Environment

Mercury in Aquatic Ecosystems

Amphibian Research and Monitoring Initiative

Priority Ecosystem Studies

Complete listing of watershed and regional scale investigations and projects >>

Other Watershed- and Regional-Scale Investigations

Watershed- and Regional-Scale Contamination Information

New Publications

Upcoming Publications

  • Challenges for mapping cyanotoxin patterns from remote sensing of cyanobacteria: Stumpf, R.P., Davis, T.W., Wynne, T.T., Graham, J.L., Loftin, K.A., Johengen, T.H., Gossiaux, D., Palladino, D., and Burtner, A., Harmful Algae (IN PRESS).
  • EPA, NASA, NOAA, and USGS collaborate to develop a Cyanobacteria Assessment Network (CyAN): Schaeffer, B.A., Loftin, K.A., Stumpf, R.P., and Werdell, P.J., EOS, Transactions of the American Geophysical Union (IN PRESS).
  • Total cylindrospermopsins, microcystins/nodularins, and saxitoxins data for the 2007 United States Environmental Protection Agency National Lake Assessment: Loftin, K.A., Dietze, J.E., Meyer, M.T., Graham, J.L., Ziegler, A.C., Maksimowicz, M.M., and Toyne, K.D., U.S. Geological Survey Data Series (IN PRESS).

Newly Published

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