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Concentrations of glyphosate and atrazine compounds in 100 Midwest United States streams in 2013


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Mahler, B.J., Van Metre, P.C., Burley, T.E., Loftin, K.A., Meyer, M.T., and Nowell, L.H., 2016, Concentrations of glyphosate and atrazine compounds in 100 Midwest United States streams in 2013: U.S. Geological Survey data release,


Temporal patterns in glyphosate and atrazine concentrations were measured weekly by the U.S. Geological Survey (USGS) during the 2013 growing season in 100 small streams in the Midwestern United States. Concentrations also were measured every 2 days at a subset of 8 of the sites, all located in Missouri. Glyphosate was detected more frequently in urban streams than in agricultural streams, and at concentrations similar to those in streams with high agricultural land use in the watershed. In contrast, atrazine was detected more frequently and at higher concentrations in agricultural streams than in urban streams. This data release provides watershed characteristics and 2013 glyphosate and atrazine compound concentrations used in the [...]


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“Table1 Site characteristics”
18.44 KB text/plain
“Table2 Precipitation”
306.37 KB text/plain
“Table3 Use intensity”
180.01 KB text/plain
“Table4 Glyphosate and atrazine concentrations in weekly samples”
71.11 KB text/plain
“Table5 Glyphosate and atrazine concentrations in 2-day samples”
11.86 KB text/plain
“Table6 Corn planting”
2.59 KB text/plain


Glyphosate and atrazine are the most intensively used herbicides in the United States. Although there is abundant spatial and temporal information on atrazine occurrence at regional scales, there are far fewer data for glyphosate, and studies that compare the two herbicides are rare. This data set presents concentrations of glyphosate and atrazine measured 12 times over 14 weeks in 100 small Corn Belt streams during the 2013 growing season. Water samples were collected by the USGS as part of the NAWQA Midwestern Stream Quality Assessment (MSQA) and analyzed at the USGS National Water Quality Laboratory, the Texas Water Science Center, and the USGS Organic Geochemistry Research Laboratory. The purpose of data collection was to investigate temporal variability in concentrations of these two intensively used herbicides over the growing season, and to compare concentrations of glyphosate and atrazine relative to one another and in the context of land use.


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  • National Water-Quality Assessment Project
  • USGS Data Release Products



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DOI doi:10.5066/F7SN073J

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