This study examines the geologic and hydrostratigraphic framework of the aquifers in Lee County, and assesses water level and water quality variations in these aquifers. The report consists of three parts. Part 1 is an interpretive text that describes in detail all the major elements of the study. Part 2 is a hydrogeologic atlas consisting of 28 plates. Part 3 contains appendices that give data used in the preparation of the maps or referred to in the text.