3 317 Environment 407（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2年20202,013,4782,004,7621,622,3241,618,88120212,006,4051,992,7681,627,6451,620,7851) 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2年202020211) 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 andponds271177--88 下下水水道道のの状状況況（平成22年度～令和３年度）1177--99 公公共共用用水水域域ににおおけけるる水水質質のの環環境境基基準準達達成成率率（平成22年度～令和３年度）Achievement Rate of Environmental Standard for Water in the Public Water Zones (F.Y. 2010 to 2021)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 yearTotal plannedPlanned areaof districtsarea ofdistricts underseweragesystemFiscal year3,3373,3403,3263,3592,5612,5592,5672,577Coverage of Sewerage (F.Y. 2010 to 2021)Total area ofdistricts underArea ofunderoperatingseweragesystemdistricts underseweragetreatmentseweragetreatmentOcean andsea1861891891925905925705902,9303,0422,9542,965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(%)74.178.080.681.11,2501,2671,2731,263Ocean andsea2)2,3692,4512,4002,39899111941034624804604641)Total plannedTotal area ofarea ofdistrictsunderdistrictsunderoperatingseweragesystemseweragesystem114,15591,72586,38785,34194,00379,81074,81976,2113)2)(%) 1)92.595.893.593.153.258.749.753.687.891.188.888.3(Area in hectares)Operationalrate(%)82.387.086.689.3Ocean andsea3)78.381.180.778.6
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