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The water chemical characteristics and age dating of springwater in Cheju island had been investigated. C1, C4, C7, C9 springwaters were not affected by seawater intrusion by TDS and electrical conductivity, relationship of Cl and tritium, Cl and HCO3 ratio, and total hardness and pseudo hardness. In this case only C7 springwater was evaluated tasty and healthy mineral springwater by Hahimoto's Mineral Balance Index. On the basis of the mean tritium content of rainfalls and springwater, the average residence time of it, were calculated. Considering the hydrogeologic and hydrochemical condition, completely mixed model seems to be very fit. It was obtained the result that C9 group springwater (C10, C12, C14) was 1.2 months, C7 springwater was 5.6 months, and deep groundwater C17 was 4 years.
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