John K. Stamer and Michael E. Wieczorek
Journal American Water Works Association, v. 88, no. 11, November 1996, p. 79-87.
Distributions of concentrations of 46 pesticides were documented from May
1992 through March 1994 for Maple Creek near Nickerson, Neb., and Platte River
at Louisville, Neb. As their source of public water supplies, Lincoln and the
western part of Omaha withdraw groundwater from the adjacent alluvium near the
Platte River site, which is hydraulically connected to the Platte River.
Organonitrogen herbicides dominated the pesticide distributions at each site.
Variations in the distributions of pesticides at the two sites partly reflect
differences in land use and land management practices. Diazinon, an
insecticide used in urban areas, was commonly detected at the Platte River
site but not at the Maple Creek site. Of the 46 pesticides analyzed at the
Platte River site, the herbicides atrazine and alachlor were more likely to
exceed their respective maximum contaminant levels of 3.0 and 2.0 micrograms
per liter; cyanazine was more likely to exceed the health advisory level of
1.0 micrograms per liter.