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Ayumi of the sewer
Last Updated February 22, 2019
| Beginning | Two years after the opening of the port, 1861, a gutter was built for the first time along with the improvement of the road at the settlement, and the drainage channel of the landfill was built with stone walls in the following two years. In 1869, pottery pipes were buried throughout the Kannai settlement under the design and supervision of Blanton, an Englishman hired by the Lighthouse Bureau since 1869, completed in 1879. During the Meiji 14-20, this was completely remodeled into brick egg-shaped tubes. In addition, sewers such as Kannai and Motomachi, which are adjacent to Yamate and Kannai Settlement, have been developed. In 1882 Kanagawa Prefecture established the Sewage Structure Regulations, and the sewage of each house in the city should be a ceramic pipe in principle. The total sewer length of the settlement transferred to the city at the time of the return of the settlement in 1899 was 88,247m, but other urban areas are unknown. |
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| 1937 | The city planning sewerage survey, which has been pending since 1923, has been completed, but has not been started due to the Sino-Japanese War and World War II. |
| 1950 | In the first phase of sewerage business, we started the public sewerage business with the approval of the construction of the Shiota area of Tsurumi Ward Shiota, Heian and Market districts. Started to improve the surface of the northern processing zone. |
| 1951 | Collection of sewerage usage fees associated with the enforcement of sewerage regulations. |
| 1953 | Sewerage fee revision. |
| 1955 | Operation of Shiota Pumping Station started. |
| 1957 | For the first time, we started construction of a sewer system including a wastewater treatment plant. Started construction of main lines and surfaces in the Chubu Processing Zone. |
| 1959 | Started operation of the market pumping station. |
| 1961 | Started the main line of northern and southern processing zones. |
| 1962 | Launched a loan and subsidy program for flush toilet remodeling and popularization. Started operation of Chubu Sewage Treatment Plant. |
| 1963 | With the enactment of the Emergency Measures Law for Improvement of Living Environment Facilities, a five-year plan (FY1938-42) was formulated with a total project cost of 17 billion yen. Started to improve the surface of the southern processing zone. |
| 1964 | The corporate accounting method is applied to the sewerage business due to a partial revision of the Local Public Enterprise Law. Sueyoshi Pumping Station started operation. |
| 1965 | Started operation of the Southern Sewage Treatment Plant. Operation of Isogo Pumping Station. |
| 1966 | Kikuna pumping station started operation. Started the main line of Kanagawa Processing Zone and Kanazawa Processing Zone. |
| 1967 | The second five-year plan (Showa 42-46) was approved by the Cabinet based on the Sewerage Improvement Emergency Measures Law, and the city has also formulated a second five-year plan of 46.5 billion yen. Operation of the Komaoka Pump Station started. Started the main line of Kohoku Processing Zone. |
| 1968 | Sewerage fee revision - Treatment area fee revision. Started operation of No. 1 Sewage Treatment Plant. |
| 1969 | The area has been expanded to the entire area, and the construction of sewerage systems in the surrounding area has begun. Started the main line of Tozuka Processing Zone. |
| 1970 | Sakuragi Pumping Station started operation. Started to improve the surface of the Kohoku Processing Zone. |
| 1971 | Formulated the third five-year plan (150 billion yen) with fiscal 1971 as the first year. |
| 1972 | Started operation of Tozuka Sewage Treatment Plant and Kohoku Sewage Treatment Plant Operation of Tsurumi pumping station and Kita-Tsunashima pumping stations started. Started maintenance of the main line of the green treatment zone and the Tozuka processing area. |
| 1973 | Started operation of the wastewater treatment plant at Torihama Plant. New Sewerage Ordinance was established - Additional sewerage fee collection started. Operation of Rokuura Pumping Station started. |
| 1975 | Sewerage usage fee revision - adopts a gradual increase rate system. |
| 1976 | Formulated the 4th Five-Year Plan (313.5 billion yen) with 1976 as the first year. Started to improve the surface of Kanagawa Processing Zone. |
| 1977 | Started operation of green sewage treatment plant. Started to improve the surface of the green treatment zone. |
| 1978 | Sewerage fee revision. Kanagawa Sewage Treatment Plant started operation. Started operation of the Shinhawa pumping station and Hodogaya pumping station. Started to improve the surface of the Kanazawa Processing Zone, the main line of the western processing zone. |
| 1979 | Operation of Kanazawa Sewage Treatment Plant started. Tozuka pumping station started operation. |
| 1981 | Formulated the fifth five-year plan (739.0 billion yen) with 1981 as the first year. Established Sewerage Business Study Group. Sewerage usage fee revision-5% of capital cost for general wastewater. Started operation of the northern second sludge incineration facility. Started operation of Kanazawa Pump Station Started to improve the surface of the western processing zone. |
| 1982 | Operation of Kasama Pumping Station started. |
| 1983 | Started operation in western sewage treatment plant. |
| 1984 | Started operation of Northern No. 2 Sewage Treatment Plant and Totsuka Daiichi Sewage Treatment Plant |
| 1985 | Sewerage fee revision. [Capital cost ratio: 30%, average revision rate: 46%] Takada Pumping Station started operation. |
| 1986 | Formulated the 6th Five-Year Plan (610 billion yen) with the first year of 1986. Started operation of the Chubu Sewage Treatment Plant. Kamoi and Kawamukai pumping station started operation. |
| 1987 | Established Sewerage Business Study Group. Started operation of the northern sludge treatment center. Operation of Kamisueyoshi pumping station and Mansei pumping station. |
| 1989 | Started operation of the Southern sludge treatment center. |
| 1991 | Formulated the 7th Five-Year Plan (612.0 billion yen) with fiscal 1991 as the first year. Egasaki pumping station started operation. |
| 1993 | Sewerage fee revision. [Capital expenses accounted for 60%, average revision rate: 22.7%] Hiranuma pumping station started operation. |
| 1995 | Egawa murmuring service started. |
| 1996 | Sewerage fee revision. [Capital cost accounting rate: 78.4%, average revision rate: 13.1%] Takinogawa murmuring service started. |
| 1997 | Start of Yumehama 2010 Plan (Heisei 9-13) |
| 1999 | Sewerage usage fee revision [Capital cost accounting rate 90%, average revision rate 9.0%] Formulation of water environment master plan. Operation of Isogo No.2 pumping station started. |
| 2000 | Started operation of the third pumping station at Chubu Sewage Treatment Plant. |
| 2002 | Start of the Medium-Term Policy Plan (Heisei 14-18) |
| 2003 | Operation of Kusu Pump Station started. |
| 2004 | Started operation of the second pump facility in Northern No. 2 Sewage Treatment Plant |
| 2005 | The lower Water Works Bureau, the Green Administration Bureau and the Environmental Conservation Bureau will be merged into Environmental Planning Bureau. Each treatment plant was renamed the water recycling center, and the sludge treatment center was renamed the sludge recycling center. |
| 2006 | Yokohama City Sewerage Business Medium-Term Management Plan 2007. |
| 2007 | The junction improvement facility "Yamashita Pump Station Rainwater Reservoir" is in operation. |
| 2008 | Sewer Exhibition '08 Yokohama. (Nationwide scale) |
For inquiries to this page
Sewage Works Management Division, Environmental Planning Bureau Sewerage Planning Coordination Department
Phone: 045-671-2840
Phone: 045-671-2840
Fax: 045-664-0571
Email address: ks-jigyomanagement@city.yokohama.jp
Page ID: 367-641-929
