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Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).

GeoHEALTH-USGS Newsletter

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The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.

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Featured Science Activities

USGS scientist sampling tap water from a public water supply

Lean about our Featured Science Activities through our pages that highlight science studies, publications, and results.

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Filter Total Items: 3787

In situ measurement of methane oxidation in groundwater by using natural-gradient tracer tests

Methane oxidation was measured in an unconfined sand and gravel aquifer (Cape Cod, Mass.) by using in situ natural-gradient tracer tests at both a pristine, oxygenated site and an anoxic, sewage-contaminated site. The tracer sites were equipped with multilevel sampling devices to create target grids of sampling points; the injectate was prepared with groundwater from the tracer site to maintain th
Authors
R. L. Smith, B.L. Howes, S. P. Garabedian
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Water and tritium movement through the unsaturated zone at a low-level radioactive-waste disposal site near Sheffield, Illinois, 1981-85

The movement of water and tritium through the unsaturated zone was studied at a low-level radioactive-waste disposal site near Sheffield, Bureau County, Illinois, from 1981 to 1985. Water and tritium movement occurred in an annual, seasonally timed cycle; recharge to the saturated zone generally occurred in the spring and early summer. Mean annual precipitation (1982-85) was 871 millimeters; mean
Authors
P.C. Mills, R. W. Healy
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Work plan for regional reconnaissance for selected herbicides and nitrate in ground water of the mid-continent United States, 1991

An approach was developed to obtain a consistent, regional distribution of herbicide and nitrate data from near-surface aquifers in the corn and soybean producing region of the mid-continent. Near-surface aquifers are defined as those with the top of aquifer material within 50 feet of land surface, regardless of whether the material is saturated or unsaturated. Three hundred wells will be selected
Authors
D.W. Kolpin, M. R. Burkart
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Midwest Water Science Center

Assessment of hydrogeologic conditions with emphasis on water quality and wastewater injection, Southwest Sarasota and West Charlotte counties, Florida

No abstract available.
Authors
C. B. Hutchinson
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Geochemical investigation of an oil spill in San Francisco Bay, California

No abstract available.
Authors
F. D. Hostettler, J. B. Rapp, K. A. Kvenvolden
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

A steady-state unsaturated-zone model to simulate pesticide transport

No abstract available.
Authors
A. T. Rutledge, J. O. Helgesen
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Kansas Water Science Center

An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH

No abstract available.
Authors
Niel Plummer, E.C. Prestemon, D.L. Parkhurst
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the middle Rio Grande Valley and Bosque del Apache National Wildlife Refuge, New Mexico, 1988-89

No abstract available.
Authors
Kim Ong, T. F. O'Brien, M.D. Rucker
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Partitioning of elements between two size sediment fractions in samples from nineteen areas of the Western United States

No abstract available.
Authors
R. C. Severson, K. C. Stewart, Thelma F. Harms
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Analytical results for sedge samples collected on the wetland receiving acid mine drainage waters from St. Kevin Gulch, Leadville, Colorado

No abstract available.
Authors
B.M. Erickson, Paul H. Briggs, K. R. Kennedy, T.R. Peacock
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Testing a method-of-characteristics model of three-dimensional solute transport in ground water

A new three-dimensional model of solute transport in groundwater that is based on a widely used two-dimensional method of characteristics model and is coupled to a modular finite-difference flow model is under development. The model's accuracy for ideal aquifers having homogeneous properties, uniform boundary conditions, and steady flow along a grid direction is demonstrated by comparison with con
Authors
Daniel J. Goode, Leonard F. Konikow
By
Water Resources Mission Area, Toxic Substances Hydrology, Pennsylvania Water Science Center

Geochemistry of dissolved inorganic carbon in a Coastal Plain aquifer. 1. Sulfate from confining beds as an oxidant in microbial CO2 production

A primary source of dissolved inorganic carbon (DIC) in the Black Creek aquifer of South Carolina is carbon dioxide produced by microbially mediated oxidation of sedimentary organic matter. Groundwater chemistry data indicate, however, that the available mass of inorganic electron acceptors (oxygen, Fe(III), and sulfate) and observed methane production is inadequate to account for observed CO2prod
Authors
F. H. Chapelle, P. B. McMahon
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program