AWWA JAW48182

A 175-mi (282-km) stretch of the Illinois River was studied during 1995 and 1996 to assess the potential effects of flooding on the quality of pumped groundwater. Water pumped from four municipal water supply wells (pumping rates, 140-500 gpm [0.009-0.03 m3/s]) was analyzed. Three of these wells were vertical wells located 175-220 ft (53-67 m) from the river's edge at normal pool stages. The fourth well was a radial-arm collector well with laterals extending beneath the river bed. This article describes the concentrations of nitrate, atrazine, total dissolved solids, and selected inorganic chemical constituents in the surface water and pumped groundwater and discusses implications for water supplies. Includes 25 references, tables, figures.