Prepared by the Task Committee on Ground Water Protection of the Water Resources Engineering Division of ASCE. This report presents general hydrogeologic information on the occurrence of contamination in groundwater that applies nationwide, as well as specific examples of approaches to groundwater protection used in various regions of the United States. Because management and regulation of resources by regional authorities is one of the most important approaches to groundwater protection, the majority of this report considers the approaches tried by different state and local authorities. The great variety of strategies adopted by these agencies indicates the uniqueness of each aquifer and the need to adjust any strategy to account for site-specific factors.