Effects of Agriculture and Urbanization on Quality of Shallow Ground Water in the Arid to Semiarid Western United States, 1993

Scientific Investigations Report 2007–5179

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179

Figure - refer to figure caption for alternative text description

Figure 27. Relation of methyl tert-butyl ether (MTBE) detection frequency collected from (A) urban and (B) agricultural areas to dissolved-oxygen concentration within regional National Water-Quality Assessment Program study units in the arid to semiarid Western United States, 1993–2004. See figure 24C for percentage of agricultural and urban wells within each dissolved-oxygen category.

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