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 25. Distribution of annual mean detection frequencies of compounds consistently detected more frequently at urban indicator sites than at most agricultural indicator sites. Each box represents the distribution of detection frequencies for a specific compound among the sites in each group for a 1-year period. A common reporting level of 0.01 microgram per liter was used for calculation of detection frequencies for all compounds. (See figure 5A and associated text for an explanation of boxplots.)

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