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Ground-water-quality-monitoring program in Iowa; nitrate and pesticides in shallow aquifers

Water-Resources Investigations Report 88-4123

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Abstract

The Iowa groundwater-quality-monitoring program began in 1982. The program is operated by the U.S. Geological Survey in cooperation with the University of Iowa Hygienic Laboratory and the Iowa Department of Natural Resources. The objectives are to describe and assess the long-term chemical quality of the principal aquifers in Iowa and to direct water quality assessment and sampling toward regional groundwater-quality concerns. Six percent of the water samples collected from 515 individual shallow wells had nitrate concentrations larger than the maximum contaminant level for public drinking water of 10 mg/L as nitrogen. Eighteen percent of the samples had concentrations of nitrate between 5 and 19 mg/L as nitrogen. Water samples from 355 individual municipal wells less than 200 ft deep have been analyzed for pesticides at least once. Detectable concentrations of at least one pesticide, either alachlor, atrazine, cyanazine, dicamba, metolachlor, or metribuzine were detected in 20% of the samples. Atrazine was the most prevalent pesticide, detected in 18% of the samples. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Ground-water-quality-monitoring program in Iowa; nitrate and pesticides in shallow aquifers
Series title:
Water-Resources Investigations Report
Series number:
88-4123
Edition:
-
Year Published:
1989
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
vi, 31 p. :ill., maps ;28 cm.