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Trends in acetochlor concentrations in surface waters of the White River Basin, Indiana, 1994–96

August 1, 1997

Corn herbicides are used extensively in the White River Basin and account for about 70 percent of the total agricultural pesticide use in the basin. Acetochlor, a corn herbicide registered for use in 1994, is expected to reduce the total amount of corn herbicides used because of its broad-spectrum weed control and low use rates. Acetochlor is considered to be a probable human carcinogen, and its continued registration is contingent on concentrations in surface and ground water not exceeding target levels. During 1994, acetochlor was detected in only trace concentrations near the mouth of the White River and not at all in a small stream (93-square-mile drainage) in the northern part of the basin. By 1996, peak concentrations were about 2 and 3 micrograms per liter near the mouth of the White River and in the small stream, respectively. The estimated annual average concentration of acetochlor near the mouth of the White River in 1996 was 0.15 micrograms per liter, well below the 2 micrograms per liter criterion for surface-water supplied community-water systems.

Citation Information

Publication Year 1997
Title Trends in acetochlor concentrations in surface waters of the White River Basin, Indiana, 1994–96
DOI 10.3133/fs05897
Authors Charles G. Crawford
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Fact Sheet
Series Number 1997–0058
Index ID fs05897
Record Source USGS Publications Warehouse
USGS Organization Indiana Water Science Center