This paper proposes a framework to evaluate the environmental impact potential of existing solid waste disposal sites in Japan based on characteristics of themselves and their environment. This evaluation method has two characteristics. One is to set up suitable evaluation scenarios severally based on plural standards of the evaluation, and the other is to introduce the indexes to evaluate the impact on downstream regions. We showed the case studies on solid waste disposal sites in the river system of the Lake Biwa and the River Yodo in Shiga, Kyoto and Osaka Prefectures, and We set up three evaluation scenarios;(1) it is water utility that regarded as major importance, (2) living conditions around solid waste disposal sites, (3) nature.
According to the results of evaluation based on both the characteristics of themselves and their environment, the average score of the sites in Shiga Prefecture, which have the geographical features that they are located in upstream regions of the river system of the Lake Biwa and the River Yodo, are not better than the average score of the sites in each of Kyoto and Osaka Prefectures. And we show the necessary to manage solid waste disposal sites in teams of river basins.