Volumes 1 and 2 of the water resources data for the 1993 water year for Oklahoma consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes or reservoirs; and water levels of ground-water wells. This report contains discharge records for 135 gaging stations; stage and contents for 30 lakes or reservoirs; water quality for 58 gaging stations; 23 partial-record or miscellaneous streamflow stations and 28 ground-water sites. Also included are lists of discontinued surface-water discharge and water-quality sites. Volume 3 contains statewide miscellaneous water-quality data. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating State and Federal agencies in Oklahoma.