Abstract: CFC (cholorofluorocarbon) gases of atmospheric origin have been used as groundwater age-indicators since the late 1980s. CFCages of groundwater samples from Aladağ karstic aquifer have been determined to range between 7-8 to 25 years. Comparison ofcalculated CFC ages with the physical and chemical properties of groundwater indicates a strong positive correlation. Moreover, thetritium and CFC composition of groundwater along the regional flow path have been found to vary harmoniously.