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Scientific Investigations Report 2012–5068


Reconnaissance of Contaminants in Selected Wastewater-Treatment-Plant Effluent and Stormwater Runoff Entering the Columbia River, Columbia River Basin, Washington and Oregon, 2008–10


Table 19. Currently used pesticides and degradates detected in filtered stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10.


[Station names are shown in table 3. Concentrations reported in micrograms per liter. See table A4 for a listing of pesticides analyzed and their reporting limits. Present, presence is verified, but concentration is not quantified. Abbreviations: E, estimated; –, not detected; sometimes the reporting limit for an individual sample was raised because of matrix interference, these instances of non-detection are shown as less than (<) the raised reporting limit]


Analyte Wenatchee Richland Umatilla The Dalles Hood River Portland1 Vancouver1 Vancouver2 Portland2 Willamette1 Willamette2 Willamette3 Willamette4 St. Helens Longview
–Dec –May
Fungicides
Metalaxyl <0.013 <0.042 <0.014 <0.021 <0.0149 <0.020 E 0.017
Myclobutanil 0.097 <0.040
cis-Propiconazole E 0.059 <0.019 <0.023 E 0.024 <0.056 E 0.055 <0.024 E 0.015 E 0.030
trans-Propiconazole E 0.069 E 0.016 <0.022 E 0.038 <0.053 E 0.069 E 0.018 E 0.043
Tebuconazole 0.076 <0.0362 <0.064 0.081
Herbicides and degradates
Atrazine 0.022 0.038 <0.009 <0.008 0.011 <0.016 0.032 <0.008
4-Chloro-2-methylphenol1 <0.007 <0.004 E 0.322 E 1.1 E 0.008
DCPA (Dacthal) Present 0.032 0.027 Present Present Present Present Present Present
3,4-Dichloroaniline1 E 0.010 E 0.073 <0.008
EPTC 0.029 E 0.005 <0.003
Hexazinone 0.021
Metolachlor 0.026 E 0.013 E 0.024 0.021 E 0.011 E 0.009
Pendimethalin 0.027 E 0.028 0.10 0.16 0.032 0.032 <0.043
Simazine <0.035 0.10 0.063 <0.008 0.14 0.051 0.058 0.046 <0.008 0.036 0.025
Tebuthiuron 0.22 <0.042 0.17 0.62 0.056 0.12 0.054 0.11
Trifluralin Present Present E 0.012 E 0.013
Insecticides and degradates
Carbaryl E 0.13 E 0.20 Present E 0.038 Present E 0.37 E 0.38 Present Present
Chlorpyrifos <0.018 E 0.062 <0.016 <0.016 E 0.017
Desulfinylfipronil1 E 0.007 Present Present Present Present Present
Diazinon 0.13 <0.010 <0.018 <0.024 <0.005 < 0.007 0.072 0.78
Fipronil Present Present Present E 0.014 E 0.049
Malathion 0.50 1.3
Other compounds
Ethoprop <0.083 2.9 <0.019 < 0.020
1-Naphthol1 E 0.026 Present Present E 0.016 Present E 0.030 E 0.056

1 Degradate.

First posted April 25, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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