Shibaura Water Reclamation Center has built Japan’s first reclaimed wastewater treatment facility that use ceramics in filtering reclaimed wastewater treatment. The coming into operation of this facility will make it possible to meet the needs for toilet water in office buildings and water for sprinkling the streets in the Nagatacho-Kasumigaseki and Yashio-East Shinagawa areas.

How does it work?

Tokyo's water supply serves about 5 million m3 of water everyday to 12million citizens in Tokyo. The water is supplied by four rivers Tone, Ara, Tama and Sagami, which flow into the Metropolitan area. The untreated water is taken from these rivers and purified through three processes - coagulation, sedimentation and filtration at local plants. It is then pressurised and supplied to customers as tap water through underground pipelines. The total length of distribution pipes is about 25,262 km in 2005.


  • Obtains a quality of treated water that is as good as that produced by conventional filtering.
  • A robust system with excellent chemical resistance and long service life (10 years or longer).
  • Used filter materials can recycled into new ceramic products.


Stable daily supply of 7,000 m3 reclaimed wastewater

Next steps

Ensure a stable supply of reclaimed wastewater, improve its quality and raise the demand for it.


This facility can be applied to other cities.