Tracing Back through the History of Sewerage in Tokyo
| 1884 | Construction the Kanda-sewer using brick lined culverts |
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| 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) | |
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Renewal opening of "Tokyo Sewerage Museum Rainbow" (April) |
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Opening of "Sewerage Training Center" (October) |
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Commencement of operation of connection pipe(s) between Kita-Tama No.1 and Minami-Tama Water Reclamation Centers (October) |
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Formulating "Sewerage Emergency Plan as Storm Rainfall Counter-measures" (December) |
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| 2014 |
Completing construction of pump house at Nishi Nippori Line, Higashi Ogu Purification Center (May) |
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Formulating "Smart Plan 2014" (June) |
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| 2015 |
Grand opening of "Shinagawa Season Terrace" which is a private commercial building in Shibaura Water Reclamation Center (May) |
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Starting incorporation of Kitano treatment area in Hachioji public sewerage system in the separate sewer area to Akikawa regional sewerage treatment area (July) |
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| 2016 |
"Management Plan 2016" was developed (February) |
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Completion of Daini Tameike Trunk sewer (March) |
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Dispatch of staff to Kumamoto City to support restoration of sewer facilities due to the Kumamoto Earthquake (April) |
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Commencement of operation of connection pipe(s) between Kita-Tama No.2 and Asakawa Water Reclamation Centers (April) |
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Formulation of “Technical Research and Development Promotion Plan 2016” (December) |
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| 2017 |
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) | |
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2019 |
50th anniversary of the regional sewerage in Tokyo (April) |
Planning Diagram of the Tokyo sewer (1908)
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 (Ochiai WWTP) (1964)
"Kanda Sewer" designated as a Tokyo historical remains (1994)
Grand opening of “Shinagawa Season Terrace” in Shibaura Water Reclamation Center (2015)