2 2（単位 面積 ヘクタール）平成22年20101,970,8331,966,8721,459,6371,460,91620151,986,8891,981,7211,550,2981,545,570令和元年20192,008,6822,000,3461,604,9051,607,21320201,998,3271,984,7381,608,8081,607,8071) 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. 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.平成22年20102015令和元年201920201) 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)資料 環境省「公共用水域水質測定結果」Source: Ministry of the Environment.計画排水区域計年度末27類型指定水域数Number of water zones to be assessed年度河川湖沼海域RiversLakes andponds2717-8 下水道の状況（平成22年度～令和２年度）Coverage of Sewerage (F.Y. 2010 to 2020)供用整備率処理場数Operational河川湖沼海域 RiversLakes andponds3)都市下水路Urban sewerage供用排水区域計計画排水区域計環境基準達成率Rate of environmental standardachievements河川湖沼海域RiversLakes andponds3)整備率End of fiscal year17-9 公共用水域における水質の環境基準達成率（平成22年度～令和２年度）Achievement Rate of Environmental Standard for Water in the Public Water Zones (F.Y. 2010 to 2020)Total plannedPlanned areaof districtsarea ofdistricts underseweragesystemFiscal year3,3373,3403,3503,3262,5612,5592,5722,567Total area ofdistricts underArea ofunderoperatingseweragesystemdistricts underseweragetreatmentseweragetreatmentOcean andsea1861891881895905925905702,9303,0422,9892,954公共下水道 Public sewerage計画処理区域面積供用排水区域計供用処理区域面積達成水域数Number of water zones whichachieved standardsNumber ofoperatingseweragetreatmentrateplants(%)74.178.079.980.51,2501,2671,2811,266Ocean andsea2)2,3692,4512,4202,4009911194944624804754601)Total plannedTotal area ofarea ofdistrictsunderdistrictsunderoperatingseweragesystemseweragesystem114,15591,72587,12784,80094,00379,81076,39073,5663)2)(%) 1)92.595.894.193.553.258.750.049.787.891.189.288.817 Environment 407(Area in hectares)Operationalrate(%)82.387.087.786.8Ocean andsea3)78.381.180.580.7
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