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 4. Number of wells sampled and number of wells with detections of coliform bacteria in samples collected in 22 study units of the National Water-Quality Assessment program, 1993–2004. (See table 2 for explanation of study-unit name abbreviations.)

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