17-8 下水道の状況（平成22～29年度）Coverage of Sewerage (F.Y. 2010 to 2017)（単位 面積 ヘクタール）(Area in hectares)公共下水道都市下水路Public sewerage 1)Urban sewerage年度末計画排水区域計計画処理区域面積供用排水区域計供用処理区域面積供用処理場数整備率計画排水区域計供用排水区域計整備率End of fiscal yearTotal plannedarea ofdistricts underseweragesystemPlanned areaof districtsunderseweragetreatmentTotal area ofdistricts underoperatingseweragesystemArea ofdistricts underseweragetreatmentNumber ofoperatingseweragetreatmentplantsOperationalrateTotal plannedarea ofdistrictsunderseweragesystemTotal area ofdistrictsunderoperatingseweragesystemOperationalrate(%)(%)(A)(B)(B/A)(C)(D)(D/C)平成22年20101,970,8331,966,8721,459,6371,460,9161,25074.1114,15594,00382.32720151,986,8891,981,7211,550,2981,545,5701,26778.091,72579,81087.02820161,986,0201,987,4051,557,8751,557,0851,27078.493,02679,83585.82920171,977,2131,972,9691,558,3511,556,8231,26578.888,11175,60785.81) 特定公共下水道を含む。 1) Including the specific public sewerage.資料 国土交通省「都市計画現況調査」Source: Ministry of Land, Infrastructure, Transport and Tourism. 17-9 公共用水域における水質の環境基準達成率（平成22～30年度）Achievement Rate of Environmental Standard for Water in the Public Water Zones (F.Y. 2010 to 2018)類型指定水域数達成水域数環境基準達成率Number of water zones to be assessed年度Fiscal year河川湖沼海域河川湖沼海域 河川湖沼海域RiversLakes andpondsOcean andsea RiversLakes andpondsOcean andseaRiversLakes andpondsOcean andsea2)3)3)(%) 1)2)3)3)平成22年20103,3372,5611865902,9302,3699946287.892.553.278.32720153,3402,5591895923,0422,45111148091.195.858.781.12920173,3412,5631885902,9742,41010046489.094.053.278.63020183,3422,5641885902,9952,42610246789.694.654.379.2資料 環境省「公共用水域水質測定結果」Source: Ministry of the Environment. 類型指定水域とは，国又は都道府県が，水域群（河川，湖沼及び海域）別に利水目的等に応じて環境基準の類型指定を行った水域をいう。 "Water zone to be assessed" refers to a demarcated water zone (rivers, lakes and sea) for which environmental standard isenforced by the national or prefectural government according to the type of usage.1) 環境基準達成率＝（達成水域数÷類型指定水域数）×100 2) 生物化学的酸素要求量（BOD） 3) 化学的酸素要求量（COD）1) Rate of environmental standard achievement = (number of water zones which achieved standard / number of water zonesto be assessed) x 100 2) Biochemical oxygen demand (BOD) 3) Chemical oxygen demand (COD)Rate of environmental standardachievementsNumber of water zones whichachieved standards17 Environment 403
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