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Tracing Back through the History of Sewerage in Tokyo

1884 Construction the Kanda-sewer using brick lined culverts
1908 "The Tokyo City Sewerage Plan" is announced (April)
1913 Stage 1 construction of the Tokyo Sewerage System Plan begins with District 2 (present-day Mikawashima treatment district)
1922 Mikawashima Sewer Treatment Plant starts operations (March)
1943 Start collecting sewerage service charges
1952 Term "sewer treatment plant" changed to "wastewater treatment plant (WWTP)"
1961 Sludge treatment facility starts operations (in Shibaura)
1962 Bureau of Sewerage is founded (April)
1964 "The Tokyo Urban Sewerage Plan" is changed so sewer planning includes all 23 Wards (February)
Ochiai WWTP starts operations. World's first park on top of a treatment facility opens (March)
Mikawashima WWTP starts reusing treated water for industrial purposes (August)
1968 Tokyo Metropolitan Government starts construction on the Tama Regional Sewerage system, with service determined by the Tokyo Bureau of Sewerage and Metropolitan Government (June)
1970 Sewerage Law amended (statement on contributing to the water quality preservation in public water districts included)
1983 Nanbu Sludge Plant starts operations (October)
1984 Flow of "Nobidome Yosui" is restarted using advanced wastewater treatment water from the Tamagawa-Jouryu WWTP (August)
Shinjuku Subcenter District Water Recycling Center starts operations using advanced wastewater treatment water from the Ochiai WWTP (October)
1986 Sewerage Mapping and Information System (SEMIS) starts (April)
1987 Wastewater heat recycling system (Urban heat) started at the Ochia WWTP (January)
Advanced wastewater treatment facility (high-rate filtration) starts at the Ochiai WWTP (April)
1988 Tokyo Rainfall Radar System for Tokyo Area (Tokyo Amesh 500) opens (June)
1992 "The Master Plan for the Second-Generation Sewerage" is enacted (July)
1994 "Kanda sewer" is designated as a Tokyo historical remains (March)
District air conditioning started in the Koraku 1 Chome area of Bunkyo Ward (July)
1995 Sewered population in the Wards reaches approx. 100%.(March)
Flow of the 3 urban channels are restarted using advanced wastewatertreatment water from the Ochiai WWTP (March)
1996 "Sludgelight" light-weight aggregate material production facility starts operations at Nanbu Sludge Plant (April)
1998 Sewerage Service Charges are revised (June)
2001 "Sewerage vision 2001" is enacted (March)
2002 Tokyo Amesh internet site opens (April)
2003 Former main pump house at the Mikawashima WWTP is designated as a Tokyo Cultural asset.(March)
2004 The term "Wastewater Treatment Plant" is changed to "Water Reclamation Center" (April)
2005 SEMIS data is published to the internet (April)
2006 Connecting pipes between Tamagawa-Jouryu and Hachioji Water Reclamation centers is completed (April)
2010 Earth Plan 2010 is enacted (February)
2011 To help rebuild the sewerage facilities after the Great East Japan earthquake support teams were sent to Sendai in Miyagi prefecture, Urayasu and Katori in Chiba prefecture (From March onwards)
2013 "Management Plan 2013" is enacted (February)
Starting to open Important cultural property "Old Mikawashima Sewage Disposal Facilities" to the public (April)

Renewal opening of "Tokyo Sewerage Museum Rainbow" (April)

Opening of "Sewerage Training Center" (October)

Commencement of operation of connection pipe(s) between Kita-Tama No.1 and Minami-Tama Water Reclamation Centers (October) 

Formulating "Sewerage Emergency Plan as Storm Rainfall Counter-measures" (December)


Completing construction of pump house at Nishi Nippori Line, Higashi Ogu Purification Center (May)

Formulating "Smart Plan 2014" (June)


Grand opening of "Shinagawa Season Terrace" which is a private commercial building in Shibaura Water Reclamation Center (May)

Starting incorporation of Kitano treatment area in Hachioji public sewerage system in the separate sewer area to Akikawa regional sewerage treatment area (July)


"Management Plan 2016" was developed (February)

Completion of Daini Tameike Trunk sewer (March)

Dispatch of staff to Kumamoto City to support restoration of sewer facilities due to the Kumamoto Earthquake (April)

Commencement of operation of connection pipe(s) between Kita-Tama No.2 and Asakawa Water Reclamation Centers (April)

Formulation of “Technical Research and Development Promotion Plan 2016” (December)


Formulation of “Earth Plan 2017”(March)

Release of smart phone edition of “Tokyo Amesh” (April)
2018 Published the Tokyo Sewerage PR Action Plan 208 (March) 
Signed a memorandum of understanding for collaborative research on Water Surface Control Device with the German company Steinhardt GmbH (May)
The 11th IWA World Water Congress and Exhibition was held in Tokyo (September)


50th anniversary of the regional sewerage in Tokyo (April)

news paper

Planning Diagram of the Tokyo sewer (1908)

Taisho period

Manhole and pipe construction in a sewer pipe behind Asakusa Park during the Taisho period (1912 to 1925).

World's first ever park on top of a Wastewater Treatment Plant picture

World's first ever park on top of a Wastewater Treatment Plant (Ochiai WWTP) (1964)

World's first ever park on top of a Wastewater Treatment Plant picture

"Kanda Sewer" designated as a Tokyo historical remains (1994)

Completion of stormwater storage pipe in the Nakamura district of Nerima Ward picture

Grand opening of “Shinagawa Season Terrace” in Shibaura Water Reclamation Center (2015)

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