To effectively acquire accomplishments of water environment and skills of problem resolution and communication which are obtained from PBL (Project Based Learning) style class, we conducted the PBL style practice of Education for Sustainable Development (ESD) with using the Water Environmental Soundness Index (original WESI) which was developed by Ministry of the Environment, and examined its leaning effectiveness. Firstly, the field investigation of waterfront environment using the original WESI was carried out. Then, students conducted the extraction of some problems of the original WESI, the discussion about improving plans, and the developing their revised WESI in the group-working. In our PBL style practice, students could understand more details about water environment situations and problems through the process for discussing the some indicator of original WESI. Furthermore, we confirmed that an original WESI could develop interests and fondness for river and riverside environment to the higher education students. WESI can also become a great tool for the PBL style practice of ESD.