Abstract
The purpose of this study, synthetic variable is led by using the multivariate analysis of the water quality of the water service classified into the taste about water service where the tap water source depends on the surface water of the river. Secondly, the actual condition of the water service beneficiary in four points is investigated in Tonegawa water system from the upper stream to the down stream region. The relation between a consideration evaluation value and a synthetic variable of investigation of actual conditions is verified. It proposes beneficiary's evaluation technique.