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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Water supply and sanitation in Japan ： ウィキペディア英語版 Water supply and sanitation in Japan Water supply and sanitation in Japan is characterized by numerous achievements and some challenges. The country has achieved universal access to water supply and sanitation; has one of the lowest levels of water distribution losses in the world; regularly exceeds its own strict standards for the quality of drinking water and treated waste water; uses an effective national system of performance benchmarking for water and sanitation utilities; makes extensive use of both advanced and appropriate technologies such as the ''jōkasō'' on-site sanitation system; and has pioneered the payment for ecosystem services before the term was even coined internationally. Some of the challenges are a decreasing population, declining investment, fiscal constraints, ageing facilities, an ageing workforce, a fragmentation of service provision among thousands of municipal utilities, and the vulnerability of parts of the country to droughts that are expected to become more frequent due to climate change. ==Access and service quality== Access to an improved water source is universal in Japan. 97% of the population receives piped water supply from public utilities and 3% receive water from their own wells or unregulated small systems, mainly in rural areas.〔Ministry of Health, Labor and Welfare:(Coverage ), retrieved on January 6, 2011〕 Access to improved sanitation is also universal, either through sewers or on-site sanitation. All collected waste water is treated at secondary-level treatment plants. All effluents discharged to closed or semi-closed water bodies, such as Tokyo Bay, Osaka Bay, or Lake Biwa, are further treated to tertiary level. This applies to about 15% of waste water. The effluent quality is remarkably good at 3–10 mg/l of BOD for secondary-level treatment, well below the national effluent standard of 20 mg/l.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Water supply and sanitation in Japan」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.