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Three areas, chosen to represent a range of agricultural practices and applied pesticides, were studied to document whether agricultural pesticides are being transported into the soil and shallow ground water in irrigated areas of Montana. Analytical scans for triazine herbicides, organic-acid herbicides, and carbamate insecticides were performed on soil and shallow ground-water samples. The results indicate pesticide residue in both types of samples. All detectable concentrations of pesticides in ground water were less than healthadvisory limits established by the U.S. Environmental Protection Agency. At the Havre Agricultural Experiment Station, three coreholes and eight wells were used to collect data at two sites. All four soil samples and two of four water samples collected after application of pesticides contained detectable concentrations of atrazine or dicamba. In an area where seed potatoes are grown near Ronan, eight wells were installed at two privately owned sites. Pesticides were not detected after an initial application of pesticides and irrigation water. After a second application of irrigation water, the site was resampled. Aldicarb metabolites were detected in four of five soil samples and in one of five water samples. At the Huntley Agricultural Experiment Station, five wells were installed in a no-tillage corn field where atrazine was applied in 1987. Soil and water samples were collected in June and July 1988; pesticides were not detected in any samples. Although pesticides were detected in several water samples, the wells sampled were completed in the shallowest available ground water. Most nearby domestic wells were several hundred feet deeper. The presence of residue of two pesticides in soil samples and three soluble pesticides in ground-water samples indicates that irrigated agricultural areas of Montana might be susceptible to the transport of soluble pesticides through permeable soils, to the shallow ground-water system.

Pesticides in soils and ground water in selected irrigated agricultural areas near Havre, Ronan, and Huntley, Montana