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 14. Annual mean detection frequencies for all 46 target compounds for each of the three types of sites during a 1-year period. Each bar represents the mean of the annual detection frequencies for a specific compound at all sites in the group during a 1-year period. Detection frequencies are based on a common reporting level of 0.01 microgram per liter for all compounds.

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