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Dissolved Pesticide Concentrations in Weekly Water Samples and Ancillary Data (Midwest, 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 freshwater 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 water 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 [...]


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“South Fork Iowa R, IA. Photo by Lisa Nowell, USGS”
thumbnail 424.96 KB
Table2_Site_Characteristics.txt 22.85 KB
Table3_Pesticide_Analyte_Information.txt 45.7 KB
Table4_Ag_Pesticide_Use_2013.txt 1.09 MB
Table5_Surrogate_QCSummary.txt 2.05 KB
Table6_Field_Blank_QCSummary.txt 684 Bytes
Table7_Replicate_QCSummary.txt 5.87 KB
Table9_Glyphosate_Concentrations_By_ELISA.txt 62.33 KB
Table1_Data_Dictionary.txt 33.18 KB
Table8_Pesticide_Concentrations_By_LCMS_MS.txt 70.03 MB


This dataset is one component of a multistressor study, the Midwest Stream Quality Assessment, conducted during 2013 by the U.S. Geological Survey National Water Quality Assessment (NAWQA) Project, National Water Quality Program (NWQP). 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.
South Fork Iowa River, IA. Photo by Lisa Nowell, USGS
South Fork Iowa River, IA. Photo by Lisa Nowell, USGS



  • National Water-Quality Assessment Project



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DOI doi:10.5066/F7Z899M8

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