National Water-Quality Assessment (NAWQA) Program

 Go to:      NAWQA Home

Pesticide National Synthesis Project

Home Publications National Statistics Data Pesticide Use Water-Quality Benchmarks PNSP Internal

Temporal Trends of Selected Agricultural Chemicals in Iowa's Groundwater, 1982-95: Are Things Getting Better?

Dana W. Kolpin, Debra Sneck-Fahrer, George R. Hallberg, and Robert D. Libra

Adapted from original article published in the Journal of Environmental Quality, v. 26, 1997.


The use of brand names in this paper is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.
ABSTRACT
INTRODUCTION
METHODS
Field
Laboratory
Project Design
RESULTS
DISCUSSION
CONCLUSION
ACKNOWLEDGMENTS
REFERENCES
TABLES
Table 1. Estimated use of selected agricultural chemicals in Iowa, 1982-95.
Table 2. Summary of results for groundwater samples collected for the Iowa Ground Water Monitoring Program during the months of April to September (1982-95) for selected agricultural chemicals.
Table 3. Temporal patterns in frequency of detection for selected agricultural chemicals in Iowa groundwater (1,019 wells). A P value ± 0.05 is not considered statistically significant.
Table 4. Temporal patterns in frequency of detection for selected agricultural chemicals in Iowa groundwater (1,019 wells) by well depth group.
Table 5. Temporal patterns in frequency of detection for selected agricultural chemicals in Iowa groundwater (1,019 wells) by aquifer type.

FIGURES (45 K)
Figure 1. Location of the 1,1019 Iowa municipal wells used for this study.
Figure 2. Location of the 89 Iowa municipal wells having the longest record of agricultural-chemical data available for this study.
Figure 3. Statistical summary of the concentration differential for selected agricultural chemicals.
Figure 4. Statistical summary of the concentration differential for selected agricultural chemicals by well depth.
Figure 5. Statistical summary of the concentration differential for selected agricultural chemicals by aquifer type.
Figure 6. Summation of alachlor + atrazine + cyanazine + metolachlor (SUM) for the 89 Iowa municipal wells having the longest record of agricultural-chemical data available for this temporal study.


Dana W. Kolpin dwkolpin@usgs.gov
U.S. Geological Survey,
400 S. Clinton St., Box 1230, Iowa City, IA 52244;
(319)-358-3614 (voice); (319)-358-3606 (fax)

Debra Sneck-Fahrer, U.S. Geological Survey, 400 S. Clinton St.,
Box 1230, Iowa City, IA 52244

George R. Hallberg, University of Iowa Hygienic Laboratory,
102 Oakdale Campus #H101 OH, Iowa City, IA_52242

Robert D. Libra, Iowa Department of Natural Resources,
Geological Survey Bureau, 123 N. Capital, Iowa City, IA 52242


Next: Abstract

Accessibility FOIA Privacy Policies and Notices

Take Pride in America home page. FirstGov button U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/nawqa/pnsp/pubs/jeq26/index.html
Page Contact Information: gs-w_nawqa_whq@usgs.gov
Page Last Modified: Tuesday, 04-Mar-2014 14:44:28 EST