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Scientific Investigations Report 2012–5091


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Reconnaissance of Land-Use Sources of Pesticides in Drinking Water, McKenzie River Basin, Oregon


Table 10. Correlation results for analysis of total concentration and number of pesticides detected (as proportion of analyses conducted) with precipitation sums from 7 days prior to sample collection.


[Abbreviaton: n.s., not statistically significant]


Site type Median
precipitation
(inches)		 Number of
samples		 Total
concentration		 Number of
pesticides
detected
Agriculture 3.88 5 n.s. n.s.
Forestry 2.27 38 n.s. 0.68 (p<0.0001)
Urban 0.62 41 n.s. -0.33 (p=0.03)
EWEB intake 1.36 17 n.s. 0.55 (p=0.02)

First posted May 30, 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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