Microbial Quality of the Nation’s Ground-Water Resources, 1993

Scientific Investigations Report 2006–5290

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

Figure - refer to figure caption for alternative text description

Figure 6. Percentage of wells testing positive for coliform bacteria (A), and significantly different (p-value <0.0006) detection frequencies of total coliform bacteria (B) by principal aquifer from data collected in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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