23452345 17 Environment 4251)Urban sewerage供用排水区域計Total plannedarea ofdistrictsunderseweragesystemTotal area ofdistrictsunderoperatingseweragesystem79.987,12776,39080.686,38774,81981.185,34176,21181.584,90175,86281.784,48074,304Rate of environmental standardachievementsLakes andpondsRivers3)(%) 1)2)89.294.150.088.893.549.788.393.153.687.892.450.389.293.852.6（単位 面積 ヘクタール）令和元年20192,008,6822,000,3461,604,9051,607,2131) 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.令和元年20191) 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End of fiscal year類型指定水域数年度河川湖沼海域公共下水道 Public sewerage供用排水区域計供用処理区域面積計画処理区域面積達成水域数供用処理場数整備率河川湖沼海域 整備率Planned areaof districtsunderseweragetreatmentTotal area ofdistricts underoperatingseweragesystemNumber of water zones whichachieved standardsLakes andpondsOcean andsea1885902,9891895702,9541925902,9651915902,9411925902,995Number ofoperatingseweragetreatmentplantsArea ofdistricts underseweragetreatment(%)1,2811,2731,2631,2331,232Lakes andpondsOcean andseaRivers2)3)2,420944752,400944602,3981034642,374964712,4161014771177--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（令和元～５年度）Achievement Rate of Environmental Standard for Water in the Public Water Zones (F.Y. 2019 to 2023)1177--88 下下水水道道のの状状況況（令和元～５年度）Coverage of Sewerage (F.Y. 2019 to 2023)(Area in hectares)都市下水路計画排水区域計環境基準達成率河川湖沼海域OperationalrateOperationalrate(%)87.786.689.389.488.0Ocean andsea3)3)80.580.778.679.880.8Total plannedarea ofdistricts underseweragesystem20202,013,4782,004,7621,622,3241,618,88120212,006,4051,992,7681,627,6451,620,78520221,987,8311,973,9581,619,7561,614,00420231,987,3921,965,2941,623,0341,619,417Number of water zones to be assessedFiscal yearRivers3,3502,57220203,3262,56720213,3592,57720223,3512,57020233,3592,576
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