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 3. Locations of wells in principal aquifers that tested positive for fecal-indicator bacteria (A) and wells where fecal-indicator bacteria were not detected in samples collected for the National Water-Quality Assessment program (B), 1993–2004.

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