Event: Catalyzing Innovations and Digitization for Safe, Sustainable, Resilient, and Inclusive Water Management: Launch of e-Marketplace and Publications Johkasou: Japan's Decentralized Wastewater Treatment System 19 March 2021 View File In Japan, when building a house or building in the area where the sewer networks are not in place, a Packaged Aerated Wastewater Treatment Plant (PAWTP – ‘Johkasou’ in Japan), the standard on-site system in Japan, must be installed in order to treat all the wastewater generated in the house or building before discharging it to the public water bodies. Disclaimer The views expressed on this website are those of the authors and do not necessarily reflect the views and policies of the Asian Development Bank (ADB) or its Board of Governors or the governments they represent. ADB does not guarantee the accuracy of the data included in this publication and accepts no responsibility for any consequence of their use. By making any designation of or reference to a particular territory or geographic area, or by using the term “country” in this document, ADB does not intend to make any judgments as to the legal or other status of any territory or area. Download Topics Water ICT