Water qualities of spring and groundwater were investigated in the foot of Mt.Fuji. The pH values of the waters at the eastern region of the mountain were more than 8 and those of other regions were mostly neutral. The electric conductivities of the spring water at the side of the mountain were relatively low, under 100μS/cm, while those of other regions mostly ranged from 100 to 200μS/cm. The value becomes higher with the distance from the top of the mountain, it is considered to reflect the residence time of groundwater. Furthermore, some of the groundwater were above 200μS/cm to be influenced by human activities. The type of water quality was dominated by Ca-HCO3 type, and it tended to change to Na・Ca-HCO3 type with the flow or the residence time. As the results of the principal component analysis, the groundwater quality showed the distribution in the direction of the first principal component with the increase of the total amount of ions. It is considered that this direction indicates that of the evolution of the groundwater quality.
