Altitude and configuration of the water table and depth to water were determined for an area near the southwestern corner of Francis E. Warren Air Force Base which is adjacent to the city limits of Cheyenne, Wyoming. Water levels in the Ogallala Formation, of late Miocene age, generally are less than 20 ft below land surface in this area where there are many private residences on small-acreage lots. Landowners rely on their own wells for water supply and have installed their own septic systems.