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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 11. Estrogenicity in wastewater-treatment-plant effluent samples, instantaneous loadings, and calculated concentrations in the Columbia River, Columbia River Basin, Washington and Oregon, December 2008.

[Station names are shown in table 2. Slight, estrogenic response was observed above the 99 percent confidence limits, but below a measurable threshold. A 7Q10 flow is not available for Umatilla, so 78,000 ft3/s is used for these calculations. Abbreviations: EEQ, estimated estradiol equivalents; ng E2/L, nanograms of 17β-estradiol per liter; ng E2/g, nanograms of 17β-estradiol per gram; Mgal/d, million gallons per day; 7Q10, the lowest streamflow for 7 consecutive days that occurs on average every 10 years; ft3/s, cubic foot per second; g/d, gram per day; –, not detected]

Analyte Wenatchee Richland Umatilla The Dalles Hood River Portland Vancouver
(a.m.) (noon) (p.m.)
EEQ in filtered water (ng E2/L) 550 760 91 230 55 1,200 1,800 1,400 780
EEQ in solids filtered from water (ng E2/g) Slight Slight Slight Slight
Daily plant discharge for sampling date (Mgal/d) 3.1 5.44 0.545 1.7 0.893 49 49 49 10
Columbia River 7Q10 flow (ft3/s) 51,557 52,700 78,000 80,637 74,000 79,436 79,436 79,436 79,436
Instantaneous load (g/d) 6.5 16 0.19 1.5 0.19 223 334 260 30
EEQ in Columbia River (ng E2/L) 0.051 0.12 0.0010 0.0075 0.0010 1.1 1.7 1.3 0.15

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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