Continuous low-level seismic activity was found to occur at Lake Jocassee after the impoundment of the reservoir in 1975. In addition to monitoring seismic activity we bagan (in January 1976) a series of geochemical measurements in an effort to search for precursors to M1~2--2.5 events. Discrete water samples were collected from wells and a spring, and their radon content was determined by scintillation counting. These data were comparable to those obtained from a continuous Rn monitor in the spring using an ionization chamber. Soil Rn measurements in track etch cups were started in 1977. The results of the data collected so far indicate (1) that long-term fluctuations occur in the radon concentrations in the spring water with a period of ~44 weeks (the radon content being 50--100% lower in summer and fall). (2) that anomalous changes in the radon concentrations have occurred both before and after earthquakes, the timing of the anomaly beigh dependent on the distance of the epicenter to the radon sample site, (3) theat both high and low anomalous radon values occur, and (4) that the soil randon method using track etch cups is useful in determining areas of high and low Rn concentration but not for a study of short-term temporal changes.