With the population falling and the super-aged society rushing in, measures for regional sustainability are urgent issues. A broad range of efforts for sustainability is needed, as seen in the 17 goals of the SDGs. An area cannot be maintained without urban facilities that supports activities. Urban facilities have a meaning of existence that extends to their broader functions as shared property in the region, as well as the meaning of existence that means their original functions. The questionnaire surveys of water treatment facilities and waste treatment facilities showed that many of them play an educational role in the area. We think that urban facilities have museum-like functions. The significance of the museum-like functions of city facilities is as follows. The first is the role of disaster prevention education and environmental education for a wide range of citizens. The second is to convey local memories and lessons learned from ancestors and history. The third role is to provide a place for communication between citizens and city facility managers. Education is emphasized in some sustainability assessment, indicators such as the SDGs, but the evaluation index is based only on school education. The contribution of urban facilities to local sustainability should be appropriately assessed by sustainability indicators. We need to consider assessing the contribution of urban facilities to local sustainability through museum-like functions.