Sumida City: Mayor Toru Yamamoto

Surrounded by rivers, Sumida City has long been closely connected with water and rain. As a result, the local culture has been nurtured and built on its relationship with water,

While rainwater, especially heavy rainfall over a short period of time, may cause urban floods, it can transform into a multipurpose water resource through proper storage. Our city promotes collecting and recycling rainwater in our daily lives. The rainwater storage system is installed at not only the city facilities, but also the Tokyo Skytree®, a popular landmark in the city, and is even widely spread in general households. The collected rainwater is utilized in toilets, sprinklers and fire extinguishing equipment. .

Because the city has demonstrated advancement in rainwater usage, we will continue to promote effective rainwater utilization in our town development and emphasize its advantages to as many people as possible. Please visit us if you are interested in using rainwater effectively.



Overview of Sumida City


Population: 260,078 (as of June 1, 2015)

Situated in the eastern part of Tokyo, Sumida City is surrounded by waterfronts and bordered by the Sumida and Arakawa Rivers. It is characterized by its land use which promotes harmony and coexistence between residences, industries, and commercial centers.

Cultivated by Edo history and culture, Sumida is a city of manufacturing that still retains the friendly atmosphere of shitamachi, the low-lying area of Tokyo with small-scale independent shops and factories. The reliable techniques and elegant forms of entertainment developed by long traditions are still very much alive in the city, as are the city’s many spots of scenic and historic interest. Furthermore, by bringing together the essence of modern cutting-edge technology, the Tokyo Skytree® was built and is currently the world’s tallest stand-alone communication tower. Thus, Sumida is moving forward to become an international tourist city that combines manufacturing with tourism.



In October 2009, Sumida made the “Sumida Eco-City Declaration.” . Since then, it has taken environmental measures, including global warming mitigation measures, as part of its efforts to develop into an environmentally friendly city. In particular, it has a long history of rainwater use. In order to take preventive measures against the consequences of heavy rainfall such as urban floods, backflow, , the city government requested the Ryogoku Kokugikan hall to use rainwater when it was built in 1982. From then on, it has actively installed rainwater use equipment in its facilities, including the city government offices. ICLEI highly evaluated this project to promote rainwater use, awarding This led the city government to open the Sumida Kankyo-Fureaikan, an environmental communication hall and rainwater library in order to communicate the utility of rainwater use to the rest of the world.

From now on, Sumida City will continue to work with its residents, business operators, and visitors to implement measures such as rainwater use, in order to ultimately realize an environmentally friendly city.   



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