1995年和1996年，对伊利诺伊河175英里（282公里）的河段进行了研究，以评估洪水对泵送地下水质量的潜在影响。分析了从四口市政供水井抽水（抽水速率为140-500 gpm[0.009-0.03 m3/s]）。其中三口井为垂直井，在正常蓄水期，距离河流边缘175-220英尺（53-67米）。第四口井是一口径向臂集水井，分支延伸至河床下方。本文描述了地表水和泵送地下水中硝酸盐、阿特拉津、总溶解固体和选定的无机化学成分的浓度，并讨论了对供水的影响。包括25个参考文献、表格和图表。

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.