National Water-Quality Assessment (NAWQA) Project
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Figure 12. When an organic contaminant was detected in both source and finished water, concentrations generally were similar, especially for nonblended finished water. As expected, the variability in concentrations between source water and finished water (scatter around the 1:1 line) was greater for blended finished water, which includes water from other wells that were not sampled. Data are shown for 22 organic contaminants that each were detected in more than 10 percent of source-water samples; data for disinfection by-products are not shown. Data are from 94 public wells from which source and finished water were sampled.