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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 7. Summary of detections in blank samples, Columbia River Basin, Washington and Oregon, 2008–10.

[No detections in blanks for pharmaceuticals. Raised reporting limits were used to further qualify the environmental data—detections less than raised reporting limit have been reported as “Present.” Abbreviations: E, estimated; PBDE, polybrominated diphenyl ether; PCB, polychlorinated biphenyl]

Compound detected 
in blank Highest value

in blank
Raised reporting limit

(5 * blank value)
Lowest detected
Anthropogenic organic compounds in unfiltered water, in micrograms per liter (field blank)
Cholesterol E 0.62 3.1 E 0.8
3-beta-Coprostanol E 0.58 2.9 E 0.63
4-Nonylphenol monoethoxylate (sum of all isomers) [NP1EO] E 0.22 1.1 E 0.32
para-Nonylphenol (total) E 0.42 2.1 E 0.4
Phenol E 0.19 0.95 E 0.18
Halogenated compounds on solids, in nanograms (field, filter, and set blanks)
Dechlorane plus 0.21 1.1 0.19
Hexachlorobenzene (HCB) 0.22 1.1 1.0
PBDE-47 2.7 14 22
PBDE-99 0.84 4.2 2
PBDE-100 0.25 1.3 0.54
PCB-194 0.11 0.55 0.06
Pentachloroanisole 0.11 0.55 0.09
Triclosan 8.4 42 6.2
Polycyclic aromatic hydrocarbons (PAHs), in micrograms per liter (field blanks)
1,4-Dichlorobenzene E 0.014 0.07 E 0.015
Diethyl phthalate E 0.155 0.78 E 0.22
Dimethyl phthalate E 0.029 0.15 E 0.016
Trace elements in unfiltered and filtered water, in micrograms per liter (field blanks)
Lead in unfiltered water E 0.053 0.27 0.18
Chromium in filtered water E 0.084 0.42 E 0.075
Mercury and methylmercury in unfiltered water, in nanograms per liter (field blanks)
Total mercury in unfiltered water 0.24 1.2 1.9

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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