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Pesticides in Weekly Water Samples from the NAWQA Midwest Stream Quality Assessment (2013)


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Nowell, L.H., Moran, P.W., Schmidt, T.S., Norman, J.E., Nakagaki, Naomi, Shoda, M.E., Mahler, B.J., Van Metre, P.C., Stone, W.W., Sandstrom, M.W., and Hladik, M.L., 2017, Pesticides in Weekly Water Samples from the NAWQA Midwest Stream Quality Assessment (2013): U.S. Geological Survey data release,


Dissolved pesticides were measured in weekly water samples from 100 wadeable streams across eleven states in the Midwestern U.S. during May-August, 2013, as part of the Midwest Stream Quality Assessment study conducted by the U.S. Geological Survey's (USGS) National Water Quality Assessment (NAWQA) Project. Of the 100 stream sites, 12 were urban indicator sites and the remaining 88 sites were located along an agricultural gradient of watershed land use. Twelve depth- and width-integrated samples were collected at each site within the 14-week study period. Water samples were filtered (0.7 micrometers) and analyzed for 227 pesticide compounds by direct-injection liquid chromatography with tandem mass-spectrometry, and for glyphosate [...]

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“Midwest Stream Quality Assessment study area”
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This Data Release contains pesticide concentrations in weekly water samples, which represents one component of the Midwestern Stream-Quality Assessment, a multistressor study conducted during 2013 by the USGS National Water Quality Assessment Project, National Water Quality Program. The purpose of the data collection was to characterize mixtures of currently used pesticides and their degradates in Midwestern streams; to screen these mixtures for potential aquatic toxicity by using a combination of aquatic-life benchmark comparisons and the Pesticide Toxicity Index; and to generate pesticide indicators for use as explanatory variables in ecological models. The purpose of the mesocosm experiment was to test whether imidacloprid caused effects on experimental communities at concentrations seen in some MSQA streams.
The Midwestern Stream Quality Assessment study area
The Midwestern Stream Quality Assessment study area


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  • National Water-Quality Assessment Project
  • USGS California Water Science Center



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DOI doi:10.5066/F7Z899M8

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