This report presents the tritium, gross alpha, and gross beta data from the amchitka Island study area. These data were obtained from samples analyzed by the U.S. Geological Survey between October 1965 and November 1970. Analyses of water samples are tabulated by increasing latitude and decreasing longitude of sampling points. The study area from which samples are reported lies within lat 51°00' and 52°00' N., and long 179°30' and 178°30' E.