Pesticides in Streams of the United States--Initial Results from the National Water-Quality Assessment Program

By Steven J. Larson, Robert J. Gilliom, and Paul D. Capel

U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999

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Figure 29. Annual load of (A) herbicides and (A) insecticides in streams in relation to agricultural use in the drainage basin of a particular stream. Each value represents the load of a specific compound at one site. The diagonal lines represent theoretical percentages of the amount of pesticides used in the basin. For example, a point on the lowest diagonal line means that the estimated load of one pesticide at a specific sampling site was 0.01 percent of the amount of that pesticide applied agriculturally in the basin of that site. Agricultural-use data are from Gianessi and Anderson (1996).

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