Water Resources Data for the 1975 water year for Pennsylvania consist of records of stage, discharge, and water quality of streams; stage, contents and water quality of lakes and reservoirs; and water levels and water quality in wells and springs. This report contains discharge records for 89 gaging stations; stage and contents for 14 lakes and reservoirs; water quality for 2 gaging stations, 46 partial-record flow stations, and water levels for 20 observation wells. Also included are data for 12 crest-stage partial-record stations and 27 low-flow partial-record stations. Additional data were collected at various sites, not part of the systematic data collection program, and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Pennsylvania.