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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)

Early spring view of a stream in Iowa with melting snow.
A team of scientists found the highest concentrations of mycotoxins in streams during spring snowmelt conditions in agricultural settings such as pictured in this Iowa stream. Photo Credit: Kate Holt, USGS -- 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

Newly Published

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Page Last Modified: Tuesday, 04-Aug-2015 14:51:25 EDT