The purpose of this report is to describe in general the occurrence, source, movement, and use of ground water in Wisconsin in order that present problems of ground-water development may be understood and to point out the need for study and evaluation of the potential ground water available. Areas with specific problems are described as are other areas that are used as examples. For the sake of brevity complete reports of studies completed or under way are not included, but the general results of such studies are the basis for the report.