Data collected for this study include ground water chemical analysis, drillers" logs of water wells, geohydrologic and geologic information. Published chemical analysis were compiled from Witcher, 1981; Swanberg and others, 1977; Muller and others, 1973; Dutt and McCreary, 1970; and Hem, 1950. Additional analysis from an area near Buena Vista were obtained from a University of Arizona Master's thesis on a sub-economic mineral deposit (Yarter, 1981). Knechtel (1938) published several analysis from the area in a U.S. Geological Survey Water Supply Paper. Knechtel"s data were not included in our data base because they were relatively incomplete. Unpublished chemical analyses were obtained from files of the city of Safford"s engineers" office and from files of the U. S. Geological Survey, Water Resources Division, Tucson. Because available published and unpublished chemical analysis usually had no aluminum, boron, or lithium analysis and because reliability of pH and alkalinity data were generally unknown, field collection of an additional 42 chemical analysis of ground water was performed. Drillers' logs and geohydrologic information were obtained from Knechtel, 1938; Witcher, 1982; and from files of the Arizona Department of Water Resources, Phoenix and the U. S. Geological Survey, Water Resources Division, Tucson.