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The FY 2008 Dissemination Status of Wastewater Treatment Facilities

August 20, 2009

The Ministry of Agriculture, Forestry and Fisheries, the Ministry of Land, Transportation and Infrastructure and the Ministry of the Environment (referred to as the "three Ministries") have compiled a report on the state of the population served by wastewater treatment facilities across the nation as of the end of FY 2008 (March 31, 2009).

The three Ministries agreed to examine the population served by wastewater treatment facilities including sewage, agricultural effluent treatment facilities, johkasoh (an on-site treatment system for domestic wastewater), and community wastewater treatment plants as an indicator describing the state of the dissemination of wastewater treatment facilities. The data on the state of their dissemination at the end of a fiscal year was firstly published in FY 1996.

In line with the "Prefectural Plan" which stipulates areas, methods and time-lines for the improvement and construction of wastewater treatment facilities, local government has been effectively and efficiently carrying out projects in regard to the development of such facilities.

The number of the people served by wastewater treatment facilities across Japan as of the end of FY 2008 is 107.74 million, an increase of 1.39 million compared to FY 2007. The dissemination rate, which is the ratio of the number of people served by wastewater treatment facilities to the total population, is 84.8% (83.7% as of March 31, 2008). However, there is a large gap between the population served by wastewater treatment facilities in big cities and medium and small towns and villages. That is to say, the dissemination rate in small towns with population under 50 thousand is only 69.3%.

The breakdown of the number of people served by wastewater treatment facilities by facility types is: 92.41 million served by sewage, 3.74 million by agricultural effluent treatment facilities, 11.27 million by johkasoh, and 310 thousand by community wastewater treatment plants.

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