Japan Platform for Redesign: Sustainable Infrastructure (JPRSI)

JPRSI Online Pavilion

Decentralized Wastewater Treatment Plant

Technology / Service Summary

Johkasou is an on-site plant which treats domestic wastewater from toilets, baths, kitchen sinks and washrooms. Johkasou purifies domestic wastewater and discharges the purified water into drains and rivers. Johkasou contributes to the improvement of the water environment in the areas.




Johkasou is a Japanese original wastewater treatment plant, and various know-hows on domestic wastewater treatment are packaged in one tank. Johkasou can show its Effectiveness on water environment improvement especially in suburbs and rural areas where sewerage systems are not to be developed.
Kubota has installed more than 20 thousands of Johkasou in mainly Southeast Asian countries and also other countries in the world. Kubota Johkasou is “Made in Japan”, thus it provides stable quality and performance. Johkasou can achieve the BOD of the effluent of 20 mg/L or less. Furthermore, Kubota can provide advanced treatment plants by combining Kubota’s proprietary membrane bioreactor system.
Kubota Johkasou has a wide variety of models from small to large (500m3/day). Therefore, Kubota can provide the best products for every kind of buildings such as houses, hotels, stores, restaurants, hospitals, etc.
In addition, Johkasou can be utilized without long construction time. Specifically, the installation of a small-size Johkasou can be completed in about one week, and even the installation of a large-size Johkasou can be completed in about three months. Therefore, Johkasou is suitable for immediate domestic wastewater treatment as well as urgent water environment improvement projects.



Controlled Substance

Applicable Regions / Countries

  • Japan
  • Southeast Asia
  • Central/South Asia
  • China/ East Asia
  • Middle East
  • Africa
  • Oceania
  • Europe
  • ASEAN countries

    Indonesia,Cambodia,Singapore,Thailand,Philippines,Brunei Darussalam,Viet Nam,Malaysia,Myanmar,Lao PDR


Kubota has installed more than 20 thousands of Johkasou in China, Vietnam, Myanmar, Sri Lanka as well as other countries in East Asia, Oceania and others.

Related SDGs Goals

  • 3. Good Health and Well-being
  • 6. Clean Water and Sanitation
  • 11. Sustainable Cities and Communities
  • 15. Life on Land

Decentralized Wastewater Treatment Plant