The U.S. Geological Survey (USGS) Toxic Substances Hydrology Program develops and applies advanced analytical methods, field investigations, laboratory studies, and modeling capabilities to understand the sources, movement, and exposure pathways of chemical and microbial hazards in the environment. Program scientists collaborate with health scientists to understand the human health implications of exposures to chemical and microbial hazards.
Our photo gallery contains photos and scientific images from current and past Toxic Substances Hydrology Program investigations.
The Program has several investigations of national concern.
Information about the USGS Toxic Substances Hydrology Program.
Identification of groundwater nitrate contamination from explosives used in road construction--Isotopic, chemical, and hydrologic evidence: Environmental Science and Technology
Density-driven free-convection model for isotopically fractionated geogenic nitrate in Sabkha brine: Groundwater
A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells: Journal of Hydrology
The precipitation of indium at elevated pH in a stream influenced by acid mine drainage: Science of the Total Environment
Corrigendum--Mercury and methylmercury stream concentrations in a coastal plain watershed--A multi-scale simulation analysis (environ. Pollut. 187 (182-192) doi 10.1016/j.envpol.2013.12.026): Environmental Pollution
Geochemistry and hydrology of perched groundwater springs--Assessing elevated uranium concentrations at Pigeon Spring relative to nearby Pigeon Mine, Arizona (USA): Hydrogeology Journal