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 13. Distribution of the mean number of compounds detected in each sample for each of the three types of sites. Detections at any concentrationare included for all samples collected at all 58 sites during 1993-95. For each site, the mean number of compounds detected in each sample was determined for each month, and the mean of these monthly values was used as the value for that site. (See figure 5A and associated text for an explanation of boxplots.)

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