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 16. Total-coliform concentrations and depths of wells for all 16 principal aquifers combined on the basis of the median depths of sampled wells, from data collected in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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