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thumbnail new Nutrients and Pesticides Assessed in a Citrus-Production Region of Florida –USGS and the Florida Department of Agriculture & Consumer Services and the Southwest Florida Water Management District described nutrients and pesticides in groundwater underlying an important citrus-production region from 1999-2010.  The results of quarterly sampling span changes in agrichemical usage and the onset of citrus greening disease (in 2005), which continues to be a serious threat to Florida and national citrus crops. The network has provided early warning of chemicals prone to leaching into underlying aquifers, documented temporal changes in concentrations, and assisted state agencies in the protection of groundwater quality and drinking-water supplies. (Report 1; Report 2)

 

thumbnail Water-quality trends and increasing urban land use near Oklahoma City, Oklahoma –USGS, in cooperation with the City of Oklahoma City, tracked increasing urban land use and water-quality trends in nitrogen, phosphorus and some pesticides from 1999-2009 in parts of the North Canadian River watershed, downstream of Oklahoma City, Oklahoma (Press release; Fact Sheet; USGS report). Increases in concentrations in nitrogen, phosphorus, and some pesticides may have been caused by changes in point-source wastewater discharges, urban development, population growth, streamflow, and/or agricultural activities.

 

thumbnail Pesticides in the Hood River Basin, Oregon –In a cooperative study with the Confederated Tribes of Warm Springs, the USGS analyzed pesticide and trace-element concentration data from the Hood River basin, Oregon, collected from 1999 through 2009 to determine the distribution and concentrations of pesticides in the basin’s surface waters. Elevated pesticides were studied because of their possible effects on three salmonid species native to the basin, listed as “threatened” under the U.S. Endangered Species Act, including the bull trout, steelhead, and Chinook salmon.

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