An exploratory well (Hawaii State well number 3-3406-13) was drilled about 1.6 miles south of the town of Haleiwa. The well is located on agricultural land within the Waialua ground-water area. The well penetrates about 20 feet into a basalt aquifer to an elevation of -10 feet. Well construction information and logs of drilling notes and geologic descriptions for the samples are presented for the well. The well is one of 12 exploratory wells drilled in the north-central Oahu area between July 1993 and May 1994 in cooperation with the Honolulu Board of Water Supply.