Scientific Investigations Report 2006–5290

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290

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Figure 12. Percentage of wells testing positive for coliform bacteria (A), and concentrations of coliform bacteria by class of water use (B) in samples collected in major aquifer study (MAS) and source-water quality assessment (SWQA) wells in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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