Followings are the results of this research, 1) 72.0% of the people answered that water quality in Onga River is "relatively dirty" or "dirty". 2) 70.4% of the whole region worried about quality of water supply cause of the aggravation of the water quality in Onga River. And people worried more about water quality in lower basin region (79.2%) and rather more about ecology in upper basin region (25.1%). 3) As reasons for aggravation of the water quality 76.3% of the whole region pointed the drainage from the human life. 4) Improvement of the water quality in BOD from 5.0mg/L to 1.0mg/L was contingent-valued as 10,150 yen to each answerer. 5) 59.0% of the answerers require providing the water facilities integrated in the whole river basin region. Water facilities should be provided after the sphere of river basin region considering the natural circulatory system.
