Images

Dr. Michael T. Meyer in the laboratory working with a ultrapressure liquid chromatograph/tandem mass spectrometer. 

Eight of 22 major aquifer networks showed increases in concentrations of deethylatrazine, a degradation product of the herbicide atrazine.

The HBSL database contains 777 contaminants currently or historically analyzed by the NAWQA Program. The database includes MCLs, HHBPs, or HBSLs for 351 contaminants. HBSLs are not available for the remaining 426 contaminants because of a lack of toxicity information.

Although the visual picture of mixing zones at stream confluences appears straightforward, such as this one at the confluence of Cement Creek and the Animas River in Colorado, the chemical reactions that occur make them extremely complex from a water-quality perspective.

Microscopic photograph of the cyanobacteria Dolichospermum circinale cells in curved filaments. This photograph is typical of the photographs in the field and laboratory guide to help identify cyanobacteria under microscopes. Figure 40 from USGSOpen-File Report 2015–1164.

Dusty conditions prior to road treatment on the auto tour loop at Loess Bluffs National Wildlife Refuge in July 2014. Loess Bluffs was the site of a large-scale field test of two dust suppressant products, with monitoring of product performance and environmental safety.

Close up of the cyanobacteria Dolichospermum lemmermannii in a harmful algal bloom

Experimental setup for small-scale transport test designed to assess the effectiveness of the "colmation layer" at the bottom sediments of Ashumet Pond (Cape Cod, Massachusetts) for filtering out cyanobacteria and viruses.

U.S. Geological Survey (USGS) scientists collecting water-quality samples from shallow groundwater under Ashumet Pond, Cape Cod, Massachusetts.

Crude-oil recovery system implemented at the Bemidji, Minnesota, research site, 1999 to 2003. The crude-oil in the unsaturated zone above the water table contained a mixture of crude oil, air, and water in the sediment pore spaces (Delin and Herkelrath, 2014).

U.S. Geological Survey (USGS) scientist collects periphyton samples from Nantahala river near Hewitt, North Carolina

U.S. Geological Survey (USGS) scientist measuring dissolved oxygen in a stream water sample. The scientist is part of a USGS team of scientists that are investigating the potential environmental effects of activities at an oil and gas wastewater injection facility in West Virginia.

Scientist holding an adult Pacific lamprey collected at Bonneville Dam. The dam is on the Columbia River between the states of Oregon and Washington.

U.S.

A view of the New River from the New River Gorge Bridge, West Virgina. Wolf Creek is a tributary of the New River. Photo: Denise M. Akob, USGS.

A U.S. Geological Survey (USGS) scientist recording water-quality parameters (pH, temperature, and specific conductance) during the purging of a domestic well that was sampled for radon at a site north of Jersey Shore, Pennsylvania.

Installing nest boxes at Clarks Marsh, Michigan, for a study of avian exposure and effects of Perfluoroalkyl substances (PFASs). Clarks Marsh, is on the south side of the former Wurtsmith Air Force Base in Oscoda Township, Michigan.

U.S. Geological Survey (USGS) hydrologic technician Dan Polette collecting a water-quality sample from Zollner Creek, Oregon for a national-scale investigation of the environmental occurrence of neonicotinoid insecticides in agricultural and urban settings.

USGS scientist collecting water-quality samples from the Enoree River, SC

USGS scientist processing water-quality samples. She is surrounded by lots of equipment

American kestrel egg experiment