Environmental Health

Toxic Substances Hydrology Program

The U.S. Geological Survey Toxic Substances Hydrology Program provides scientific information on the environmental pathways of chemical and microbial contaminant exposures. In collaboration with the Contaminant Biology Program, as well as public health experts and others, fundamental datasets and other knowledge products are developed to understand the implications of environmental contaminant exposures on the health of humans and other organisms.

GeoHealth Newsletter

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GeoHealth Newsletter
Volume 12, No. 1, 2015

GeoHealth is the U.S. Geological Survey's Environmental Health Newsletter.


Power plant smoke stack

The Program has several investigations of national concern.

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Data and Tools

An example of field work - Scientist working on a packer string

Environmental Contaminant Data

Data from studies on the occurrence and distribution of environmental contaminants

Scientist working with analytical equipment in a laboratory

Methods and Tools

Information on field methods, measuring environmental contaminants, models tools, geophysical methods, tracer test, and management and remediation alternatives.

Photo Gallery

USGS scientists collecting water samples for pesticide analysis off of a bridge.

Our photo gallery contains photos and scientific images from current and past Toxic Substances Hydrology Program investigations.

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Program Information

Information about the USGS Toxic Substances Hydrology Program.