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Effects of herbicide usage on water quality of selected streams in Wyoming

Open-File Report 80-1110

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Abstract

During 1977 and 1978 the Wyoming Department of Agriculture, in conjunction with county weed and pest control districts, conducted a noxious-weed-control program in Wyoming. The herbicides primarily used were picloram, 2,4-D, and dicamba. The U.S. Geological Survey, in cooperation with the Wyoming Department of Agriculture, sampled and analyzed water from selected streams for these herbicides plus silvex; 2,4,5-T; and 2,4-DP. This report contains data for samples collected during 1977 and 1978. The most commonly detected herbicides in water samples were 2,4-D with 41% nonzero values and picloram with 34.5% nonzero values. Herbicide occurrence in bottom-material samples was uncommon; dicamba was found with 9% nonzero values. The maximum herbicide concentration in water was 1.1 micrograms per liter of 2,4-D, and the maximum herbicide concentration in bottom material was 8.0 micrograms per kilogram of 2,4-D. Based on available toxicity data and water-quality criteria, these herbicide concentrations do not constitute dangerous or harmful concentrations to humans or to the environment. (USGS)

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Effects of herbicide usage on water quality of selected streams in Wyoming
Series title:
Open-File Report
Series number:
80-1110
Edition:
-
Year Published:
1980
Language:
ENGLISH
Description:
v, 17 leaves (some folded) : maps ; 29 cm.