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 26. Monthly median concentrations of selected compounds at 11 urban indicator sites during a 1-year period. Each value represents the median concentration for 1 month. The annual median for each site is shown in red. Monthly median concentrations less than the detection limit are shown on the x-axis. For sites at which all 12 monthly values were less than the detection limit, the annual median value is plotted on the x-axis. The order of sites, from left to right, is approximately east to west and is in the same order as presented in table 1. Site codes are defined in table 1.

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