Dissolved Pesticides in Weekly Water Samples from the NAWQA California Stream Quality Assessment (2017)
Dates
Publication Date
2021-06-22
Time Period
2017-03-13
Time Period
2017-05-11
Citation
Morace, J.L., Sandstrom, M.W., Nowell, L.H., Mahler, B.J., Button, D.T., and VanMetre, P.C., 2021, Dissolved Pesticides in Weekly Water Samples from the NAWQA California Stream Quality Assessment (2017): U.S. Geological Survey data release, https://doi.org/10.5066/P9ADZYQE.
Summary
Dissolved pesticides were measured in weekly water samples from 85 wadeable streams in Central Coastal California over a variable six-week period during March–May, 2017, as part of the California Stream Quality Assessment (CSQA) study conducted by the U.S. Geological Survey's (USGS) Regional Stream-Quality Assessment (RSQA) Project. The 85 streams consisted of 40 urban sites (5–100% urban land in the lower basin), 9 agricultural sites, 24 mixed land-use sites, and 12 undeveloped sites. Water samples were filtered (0.7 micrometers) and analyzed for 253 pesticide compounds by direct-injection liquid chromatography with tandem mass-spectrometry (LC-MS/MS). Two similar LC-MS/MS methods were used: a broad-spectrum (223 compounds) method [...]
Summary
Dissolved pesticides were measured in weekly water samples from 85 wadeable streams in Central Coastal California over a variable six-week period during March–May, 2017, as part of the California Stream Quality Assessment (CSQA) study conducted by the U.S. Geological Survey's (USGS) Regional Stream-Quality Assessment (RSQA) Project. The 85 streams consisted of 40 urban sites (5–100% urban land in the lower basin), 9 agricultural sites, 24 mixed land-use sites, and 12 undeveloped sites. Water samples were filtered (0.7 micrometers) and analyzed for 253 pesticide compounds by direct-injection liquid chromatography with tandem mass-spectrometry (LC-MS/MS). Two similar LC-MS/MS methods were used: a broad-spectrum (223 compounds) method in use since 2012 and a newly developed method for 30 new-generation fungicides and diamide and neonicotinoid insecticides. This Data Release provides sampling-site locations, analyte information, concentration data for pesticide compounds in environmental weekly water samples, quality-control data for the new method (to supplement previously published quality control data for the standard method), aquatic-life benchmark and Pesticide Toxicity Index toxicity concentration values that were used to assess potential toxicity, estimates of agricultural and nonagricultural pesticide-use data, and streamflow data for gaged sites, in support of the journal article, “New-generation pesticides are prevalent in California’s Central Coast streams,” by Sandstrom, M.W., Nowell, L.H., Mahler, B.J., and Van Metre, P.C.
Click on title to download individual files attached to this item.
CAPesticideMetadata.xml Original FGDC Metadata
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CA_Reclamation.jpg “Reclamation Ditch near Salinas, CA (USGS 11152650) Photo by Alan Cressler, USGS”
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Table4_Pesticide_Data.txt
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Table5_Pesticide_Use_Data.txt
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Table7_Precipitation.txt
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Table8_Streamflow.txt
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Table9_Field_Blank_Data.txt
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Table13_Replicate_Data.txt
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Table14_Replicate_Summary.txt
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Table15_Field_Spike_Data.txt
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Table16_Field_Spike_Summary.txt
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Table17_Lab_Spike_Summary.txt
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Table11_Lab_Blank_Data.txt
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Table12_Lab_Blank_Summary.txt
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Table10_Field_Blank_Summary.txt
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Table1_Data_Dictionary.txt
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Table2_Sites.txt
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Table3_Analyte_Info.txt
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Table6_Pesticide_Use_Summary.txt
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Purpose
This Data Release contains pesticide concentrations in weekly water samples from the California Stream-Quality Assessment (CSQA) conducted by the Regional Stream-Quality Assessment (RSQA) Project. The pesticide data in this Data Release represent one component of the RSQA studies, which are multistressor studies conducted by the USGS National Water Quality Assessment Project, National Water Quality Program. The objectives of the data collection were to characterize mixtures of currently used pesticides and their degradates in 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. Two pesticide methods were used to analyze for 253 pesticide compounds: LCM60 (223 pesticide compounds analyzed in all RSQA studies) and LCM75 (30 pesticide compounds analyzed by a new method in just the CSQA).
Preview Image
Reclamation Ditch near Salinas, CA (USGS 11152650) Photo by Alan Cressler, USGS