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Approximately, 1,300 sq mi of surficial outwash deposits underlie the Big Sioux River basin of eastern South Dakota. Areal differences in the quality of water in the outwash deposits are determined largely by contact time between groundwater and limestone, dolomite, gypsum, and weathering products of those minerals rather than by differences in the mineralogy of the outwash. Water from the surficial outwash deposits in the basin has dissolved-solids concentrations ranging from 220 to 3,050 mg/L. Dominant ions in the water are calcium, magnesium, sulfate, and bicarbonate. The relation between dissolved solids and specific conductance is curvilinear because of generally large concentrations of sulfate. No relations between hydrogeology and water quality constituents were observed. Spatial relations among aquifers in the northern, central, and southern portions of the Big Sioux River also were absent. Water samples from one of the seven outwash units examined in the study had concentrations of nearly all chemical constituents that were significantly larger than those in samples from the other six outwash units. Nitrate-nitrogen concentrations in the water approached and commonly exceeded the maximum contaminant level of 10 mg/L for drinking water established by the US Environmental Protection Agency. Nitrate-nitrogen concentrations were found to be related inverselymore » to several major cations and anions.« less

Quality of water from surficial-outwash aquifers in the Big Sioux River basin, eastern South Dakota