– ICLEI Japan Member Information –

Sumida City

Message from the Mayor of Sumida City 

Tooru Yamamoto

Surrounded by rivers, Sumida has had a deep connection with rain and water since ancient times. The city has nurtured this connection through a variety of relationships and is dotted with historical sites such as shrines and monuments related to rain and water. 

Rainwater causes urban flooding due to typhoons and torrential rains, but it can also be reclaimed as a water resource through effective use. In our city, we are promoting the storage and use of rainwater. In addition to the city office and other city facilities, rainwater harvesting tanks have been installed in the Tokyo Sky Tree®, and are also widely used in ordinary houses for flushing toilets, sprinkling water on plants, and water for fire prevention. 

As an advanced location for rainwater harvesting, Sumida will continue to promote urban development using rainwater and will make efforts to publicize the benefits of rainwater harvesting to as many people as possible. If you are interested in rainwater harvesting, please come visit Sumida City! 

Overview of Sumida City 

Sumida City is located in the eastern part of Tokyo and is surrounded by the Sumida River, the Arakawa River, and many other bodies of water. It is characterized by a harmonious mix of residential, industrial, and commercial land use. 

It is a manufacturing town but has a downtown atmosphere nurtured by the history and culture of the Edo period. There are many famous places, traditional arts, and historic sites as well as technology. Furthermore, Tokyo Sky Tree®, the world’s tallest freestanding radio tower, was built with the best of modern technology, and the city is on its way to becoming an international tourist city that fuses manufacturing and tourism. 

Basic Information

288,556

Population
(As of 1 July 2025) 

13.77

Area

Sumida City Website

Environmental Initiatives 

In October 2009, Sumida declared itself as the Sumida Environmental District, and has been implementing environmental measures against global warming to realise an environmentally friendly city. The city has a particularly long history of rainwater utilization, starting with a request for rainwater utilization during the construction of the Ryogoku Kokugikan in 1982 to prevent urban flooding caused by the backflow of sewage during heavy rains. These rainwater utilization promotion projects were highly evaluated by ICLEI, and Sumida received the International Municipal Environment Award in 2000.

In the future, Sumida will continue to work together with its residents and businesses to realize an environmentally friendly city, including rainwater harvesting. 

Sumida Environmental Policy Division Website

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