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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 14. Currently used pesticides and degradates detected in filtered wastewater-treatment-plant effluent, Columbia River Basin, Washington and Oregon, December 2009.

[Station names are shown in table 2. 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; sometimes the reporting limit for an individual sample is raised because of matrix interference, these instances of non-detection are shown as less than (<) the raised reporting limit. Abbreviations: E, estimated; –, not detected]

Analyte Wenachee Richland Umatilla The Dalles Hood River Portland Vancouver St. Helens Longview
cis-Propiconazole E 2.8
trans-Propiconazole E 6.9
Herbicides and degradates
Atrazine Present < 0.0095 Present
3,4-Dichloroaniline1 E 0.034 E 0.056 E 0.052 E 0.12 E 0.021 < 0.065 E 0.28 E 0.034 E 0.13
Metolachlor E 0.012
Prometon Present Present
Simazine E 0.005
Insecticides and degradates
Carbaryl E 0.092 Present
Desulfinylfipronil1 Present Present Present Present Present Present Present
Fipronil E 0.027 Present E 0.042 E 0.056 E 0.078 E 0.087 < 0.047 E 0.13
Fipronil sulfide1 Present Present Present Present Present Present 0.022 E 0.006
Fipronil sulfone1 Present Present Present 0.024
Other compounds
1-Naphthol1 Present Present


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

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