As part of the U.S. Geological Survey Water Resources Division 's objective of presenting impartial, accurate data and scientific analyses equally to all interested parties, current activities in Pennsylvania are described by a listing of project location, cooperator(s), period of project, project chief, headquarters office, problem, objective, approach, progress and plans. The basic data programs for surface water, groundwater, and water quality are described. Also included is an extensive listing of selected literature on water resources in Pennsylvania and information on obtaining these publications. A brief description of the Water Resources mission of the U.S. Geological Survey and a list of cooperators and types of funding is included and also a description of U.S. Geological Survey data bases and information sources. (USGS)