Water-quality data were collected at 34 sites in the vicinity of the Y-12 Plant, Oak Ridge, Tennessee, on April 12 and 13, 1984. Concentrations of dissolved major and trace constituents were determined; field determinations of specific conductance, pH temperature, alkalinity, and dissolved oxygen were made. Gross alpha and beta activity were determined for 10 of the 34 sites, and dissolved organic carbon and oil and grease concentrations were determined for 11 of the sites sampled on June 3, 1984.