Environmental Health

Toxic Substances Hydrology Program

The U.S. Geological Survey Toxic Substances Hydrology Program provides objective scientific information on and the environmental pathways of chemical and microbial contaminant exposures. In collaboration with the Contaminant Biology Program as well as public health experts and others, the 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 13, No. 1, 2016

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


USGS scientists collecting gas samples from the unsaturated zone

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 using ultra-clean techniques to collect a water sample.

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.