水質の測定基準

四万十川の水質を調べるため、2つの基準を利用してデータを収集しています。

河川の環境基準

国が定める水質汚濁の基準について

四万十川の清流基準

四万十川には独自の清流基準があります。

四万十川の排水について

四万十川流域での生活排水は最終的に川へ流れ込みます。
ここでは四万十川流域の排水についてまとめています。

排水処理の仕組み

さまざまな方法で排水を処理しています。

四万十川流域の排水処理状況(令和2年度)
詳細を見る
排水水質BoD

グラフと実測値

清流度の場所別推移
BODの場所別推移
データマップ

すべての実測値データ

年月日調査typeareanameDoE(km)気温水温色相臭気流速(m/秒)水深(m)採取位置pHSS(mg/L)T-N(mg/L)T-P(mg/L)色度(度)濁度(度)TOC(mg/L)EC(μS/cm)清流度:黒(m)清流度:白(m)BOD(mg/L)DO(mg/L)大腸菌群数 (MPN/100ml)水生生物id
2021-06-09高知県本流四万十川三堰79.123.620.4無色無臭0.210.5流心7.5<10.20.0150.4674.56.11
2021-08-31高知県本流四万十川三堰79.135.024.1無色無臭0.340.5右岸7.4<10.110.0092.20.60.4625.34.82
2021-11-16高知県本流四万十川三堰79.117.211.5無色無臭0.160.5右岸7.9<10.170.0042.00.20.3678.67.33
2022-03-09高知県本流四万十川三堰79.112.110.1無色無臭0.000.5流心7.510.170.011.90.80.5856.35.24
2021-06-09高知県本流四万十川十川42.432.023.5無色無臭0.590.5流心8.7<10.140.0120.6763.93.45
2021-08-31高知県本流四万十川十川42.439.027.4無色無臭0.840.5左岸8.4<10.130.0072.40.80.5796.34.16
2021-11-16高知県本流四万十川十川42.419.014.3無色無臭0.670.5左岸8<10.260.0063.31.00.6774.84.27
2022-03-09高知県本流四万十川十川42.419.510.9無色無臭0.540.5流心7.6<10.210.0121.90.90.61115.95.48
2021-06-11高知県本流四万十川具同9.023.022.3無色無臭0.630.5右岸7.710.150.010.6782.83.99
2021-09-01高知県本流四万十川具同9.033.026.8無色無臭0.760.5右岸8.110.10.0062.51.30.5784.94.610
2021-11-16高知県本流四万十川具同9.016.114.6無色無臭0.400.5右岸8.2<10.250.0072.61.10.6844.86.711
2022-03-09高知県本流四万十川具同9.015.011.9無色無臭0.380.5流心7.7<10.190.011.61.20.51044.15.612
2021-06-09高知県支流広見川川崎橋34.832.026.5無色無臭0.610.5流心9.210.160.0211.11073.34.713
2021-08-31高知県支流広見川川崎橋34.834.529.9無色無臭0.570.5左岸8.420.120.015.01.60.91103.84.914
2021-11-16高知県支流広見川川崎橋34.818.514.5無色無臭0.630.5左岸8.510.30.0094.50.61.01363.33.215
2022-03-09高知県支流広見川川崎橋34.816.612.8無色無臭0.670.5左岸7.710.320.0215.61.81.41563.33.716
2021-06-09高知県本流四万十川大正流量観測所54.232.322.5無色無臭0.720.5流心7.5<10.150.0130.5704.65.617
2021-08-31高知県本流四万十川大正流量観測所54.234.525.8無色無臭0.940.5右岸7.9<10.160.0082.51.00.5715.87.018
2021-11-16高知県本流四万十川大正流量観測所54.217.512.8無色無臭1.110.5右岸7.5<10.240.0063.00.40.5766.37.719
2022-03-09高知県本流四万十川大正流量観測所54.218.310.2無色無臭0.630.5右岸7.6<10.250.0132.01.00.61046.58.320
2021-06-09高知県支流梼原川田野々大橋54.730.822.7無色無臭0.540.5流心8.3<10.140.0080.5784.94.921
2021-08-31高知県支流梼原川田野々大橋54.733.826.3無色無臭0.360.5右岸7.9<10.130.0072.71.20.4764.44.022
2021-11-16高知県支流梼原川田野々大橋54.717.812.9無色無臭0.660.5右岸7.610.260.0063.31.00.6834.03.223
2022-03-09高知県支流梼原川田野々大橋54.716.29.6無色無臭0.280.5流心7.3<10.150.0112.20.80.51214.84.424
2021-06-01高知県支流黒尊川合流前25.528.520.2無色無臭1.040.5流心7.5<10.170.0082.00.30.34713.613.525
2021-09-13高知県支流黒尊川合流前25.524.423.0無色無臭0.820.5流心7.6<10.20.0051.90.30.35013.014.126
2021-11-17高知県支流黒尊川合流前25.59.012.9無色無臭0.310.5流心8.4<10.20.0021.50.10.25418.223.527
2022-03-10高知県支流黒尊川合流前25.522.511.9無色無臭0.300.5流心7.6<10.170.0031.20.10.25718.724.728
2021-06-09高知県支流目黒川合流前31.527.522.8無色無臭0.570.5流心8.1<10.220.0070.5564.67.229
2021-08-31高知県支流目黒川合流前31.530.826.6無色無臭0.780.5流心8.1<10.210.0042.80.50.5567.27.230
2021-11-16高知県支流目黒川合流前31.515.912.8無色無臭0.300.5流心8.210.210.0032.50.20.4638.811.931
2022-03-09高知県支流目黒川合流前31.515.79.7無色無臭0.310.5流心7.8<10.250.011.90.30.46911.111.532
2021-06-09高知県支流吉見川合流前72.026.521.0無色無臭0.380.5流心7.4<10.670.0660.8892.12.133
2021-08-31高知県支流吉見川合流前72.034.524.9無色無臭0.700.5流心7.3<10.510.0353.61.50.7904.03.634
2021-11-16高知県支流吉見川合流前72.018.213.6無色無臭0.730.5流心7.410.730.0483.71.00.5982.82.335
2022-03-09高知県支流吉見川合流前72.016.310.6無色無臭0.640.5流心7.211.110.134.42.21.41502.41.836
2021-06-09高知県本流四万十川用井カヌー館前33.832.123.6無色無臭0.390.5流心8.8<10.130.0110.5774.04.537
2021-08-31高知県本流四万十川用井カヌー館前33.836.028.6無色無臭0.620.5左岸8.3<10.120.0072.51.00.5815.54.638
2021-11-16高知県本流四万十川用井カヌー館前33.818.513.9無色無臭0.320.5左岸8.310.240.0053.40.50.6785.55.339
2022-03-09高知県本流四万十川用井カヌー館前33.817.311.3無色無臭0.480.5流心7.610.230.0142.11.10.81235.15.140
2020-08-31高知県本流四万十川三堰79.135.024.1無色無臭0.340.5右岸7.4<10.110.0092.20.60.4625.34.841
2002-01-01高知県本流四万十川鍛冶屋瀬橋75.56.8~8.21 0.39 0.013 5.00.710600242
2002-01-01高知県本流四万十川大正流量観測所54.26.7~8.41 0.26 0.010 6.70.710930143
2002-01-01高知県本流四万十川32.26.5~8.31 0.29 0.010 5.50.89.7450244
2002-01-01高知県本流四万十川具同9.07.2~7.91 0.25 0.010 4.50.59.91000245
2002-01-01高知県支流仁井田川合流前74.66.8~8.31 1.17 0.056 3.01.1101700246
2002-01-01高知県支流吉見川合流前72.00.96 0.070 2.5547
2002-01-01高知県支流梼原川田野々大橋54.77.0~8.41 0.20 0.007 7.90.710410148
2002-01-01高知県支流広見川川崎橋34.80.44 0.020 2.7149
2002-01-01高知県支流目黒川合流前31.50.31 0.006 7.9150
2002-01-01高知県支流黒尊川合流前25.50.23 0.006 13.4151
2002-01-01高知県支流後川後川橋9.57.0~8.020.42 0.048 2.71.310340052
2002-01-01高知県支流後川秋田橋13.0153
2002-01-01高知県支流中筋川坂本橋7.97.0~7.480.70 0.061 1.11.28.82700054
2002-01-01高知県支流中筋川五反田橋21.0455
2003-01-01高知県本流四万十川鍛冶屋瀬橋75.57.1~8.3<10.30 0.008 7.40.711520256
2003-01-01高知県本流四万十川大正流量観測所54.26.9~8.2<10.280.0096.80.811510157
2003-01-01高知県本流四万十川32.26.9~8.010.31 0.012 5.50.7102500158
2003-01-01高知県本流四万十川具同9.07.3~7.810.290.0095.90.79.98000159
2003-01-01高知県支流仁井田川合流前74.67.0~8.221.40 0.054 2.31.4112700260
2003-01-01高知県支流吉見川合流前72.01.010.0592.7561
2003-01-01高知県支流梼原川田野々大橋54.76.9~8.210.20 0.007 8.00.711250162
2003-01-01高知県支流広見川川崎橋34.80.530.0263.6163
2003-01-01高知県支流目黒川合流前31.50.28 0.006 10.2164
2003-01-01高知県支流黒尊川合流前25.50.220.00514.2165
2003-01-01高知県支流後川後川橋9.57.1~8.220.38 0.023 2.20.8102500066
2003-01-01高知県支流後川秋田橋13.0167
2003-01-01高知県支流中筋川坂本橋7.97.0~7.980.74 0.053 0.81.38.32700068
2003-01-01高知県支流中筋川五反田橋21.0469
2004-01-01高知県本流四万十川鍛冶屋瀬橋75.56.6~8.210.24 0.009 7.20.710.6770270
2004-01-01高知県本流四万十川大正流量観測所54.27.4~7.9<10.190.0096.90.910.21100171
2004-01-01高知県本流四万十川32.27.1~7.810.27 0.009 5.80.89.92700272
2004-01-01高知県本流四万十川具同9.07.2~7.710.270.0125.30.610.13100273
2004-01-01高知県支流仁井田川合流前74.66.6~8.161.19 0.048 2.61.310.54800374
2004-01-01高知県支流吉見川合流前72.00.690.0522.8575
2004-01-01高知県支流梼原川田野々大橋54.77.4~8.0<10.16 0.006 7.70.810.5590176
2004-01-01高知県支流広見川川崎橋34.80.370.0193.7177
2004-01-01高知県支流目黒川合流前31.50.26 0.006 10.3178
2004-01-01高知県支流黒尊川合流前25.50.20.00514.3179
2004-01-01高知県支流後川後川橋9.57.0~7.820.39 0.037 1.9<0.59.9850080
2004-01-01高知県支流後川秋田橋13.0181
2004-01-01高知県支流中筋川坂本橋7.96.6~7.4120.54 0.560 1.11.791400082
2004-01-01高知県支流中筋川五反田橋21.0483
2005-01-01高知県本流四万十川鍛冶屋瀬橋75.57.4~8.110.33 0.013 5.00.510.43400284
2005-01-01高知県本流四万十川大正流量観測所54.27.7~8.110.230.0095.50.610.2720185
2005-01-01高知県本流四万十川32.27.9~8.310.32 0.010 5.10.69.4900186
2005-01-01高知県本流四万十川具同9.07.2~8.210.30.0094.80.59.71600287
2005-01-01高知県支流仁井田川合流前74.67.4~8.031.14 0.057 2.40.810.44100388
2005-01-01高知県支流吉見川合流前72.00.840.0681.3589
2005-01-01高知県支流梼原川田野々大橋54.77.7~8.1<10.19 0.006 7.30.610710190
2005-01-01高知県支流広見川川崎橋34.80.480.0213.4291
2005-01-01高知県支流目黒川合流前31.50.34 0.006 8.5192
2005-01-01高知県支流黒尊川合流前25.50.280.00515.5193
2005-01-01高知県支流後川後川橋9.57.0~8.150.38 0.035 1.20.69.51900094
2005-01-01高知県支流後川秋田橋13.0195
2005-01-01高知県支流中筋川坂本橋7.97.2~7.960.75 0.061 0.91.29.61100096
2005-01-01高知県支流中筋川五反田橋21.0397
2006-01-01高知県本流四万十川鍛冶屋瀬橋75.57.8~8.510.33 0.010 9.50.810500298
2006-01-01高知県本流四万十川大正流量観測所54.27.8~8.3<10.280.0067.30.89.8240299
2006-01-01高知県本流四万十川32.27.5~7.910.29 0.008 7.00.79.416002100
2006-01-01高知県本流四万十川具同9.07.1~8.010.330.0064.30.69.84202101
2006-01-01高知県支流仁井田川合流前74.67.4~8.421.63 0.062 2.81.89.817003102
2006-01-01高知県支流吉見川合流前72.01.350.1342.45103
2006-01-01高知県支流梼原川田野々大橋54.77.8~8.6<10.15 0.005 9.819.82202104
2006-01-01高知県支流広見川川崎橋34.80.440.0133.51105
2006-01-01高知県支流目黒川合流前31.50.36 0.005 18.02106
2006-01-01高知県支流黒尊川合流前25.50.250.00520.21107
2006-01-01高知県支流後川後川橋9.57.0~7.920.58 0.052 4.10.79.828000108
2006-01-01高知県支流後川秋田橋13.01109
2006-01-01高知県支流中筋川坂本橋7.97.2~7.671.04 0.550 1.01.19.219000110
2006-01-01高知県支流中筋川五反田橋21.04111
2007-01-01高知県本流四万十川鍛冶屋瀬橋75.57.0~7.010.18 0.004 13.30.99.912002112
2007-01-01高知県本流四万十川大正流量観測所54.27.2~8.4<10.190.00511.61.19.52201113
2007-01-01高知県本流四万十川32.27.8~8.210.18 0.004 11.30.69.48102114
2007-01-01高知県本流四万十川具同9.07.3~8.210.190.00510.10.69.916003115
2007-01-01高知県支流仁井田川合流前74.66.9~7.531.37 0.032 2.71.61074003116
2007-01-01高知県支流吉見川合流前72.01.250.1092.86117
2007-01-01高知県支流梼原川田野々大橋54.77.2~8.2<10.12 0.005 10.50.9104502118
2007-01-01高知県支流広見川川崎橋34.80.310.0063.91119
2007-01-01高知県支流目黒川合流前31.50.28 0.003 10.41120
2007-01-01高知県支流黒尊川合流前25.50.220.00321.41121
2007-01-01高知県支流後川後川橋9.57.2~7.820.55 0.061 7.10.79.744000122
2007-01-01高知県支流後川秋田橋13.01123
2007-01-01高知県支流中筋川坂本橋7.97.4~7.770.76 0.108 2.31.29.534000124
2007-01-01高知県支流中筋川五反田橋21.03125
2008-01-01高知県本流四万十川鍛冶屋瀬橋75.57.1~7.710.35 0.007 9.60.79.68903126
2008-01-01高知県本流四万十川大正流量観測所54.27.5~8.410.240.00811.70.89.72203127
2008-01-01高知県本流四万十川32.27.3~8.210.35 0.007 7.50.71035001128
2008-01-01高知県本流四万十川具同9.07.3~8.020.290.0077.90.51019003129
2008-01-01高知県支流仁井田川合流前74.66.4~7.721.78 0.053 4.319.770001130
2008-01-01高知県支流吉見川合流前72.01.210.1023.05131
2008-01-01高知県支流梼原川田野々大橋54.77.8~8.310.26 0.008 7.80.89.92801132
2008-01-01高知県支流広見川川崎橋34.80.530.0154.51133
2008-01-01高知県支流目黒川合流前31.50.26 0.004 14.21134
2008-01-01高知県支流黒尊川合流前25.50.260.00418.11135
2008-01-01高知県支流後川後川橋9.57.1~7.820.43 0.031 6.40.61016000136
2008-01-01高知県支流後川秋田橋13.01137
2008-01-01高知県支流中筋川坂本橋7.97.2~8.060.83 0.025 1.91.51034000138
2008-01-01高知県支流中筋川五反田橋21.03139
2009-01-01高知県本流四万十川鍛冶屋瀬橋75.57.3~8.010.37 0.004 5.30.69.71903140
2009-01-01高知県本流四万十川大正流量観測所54.27.6~7.9<10.320.0027.90.79.83501141
2009-01-01高知県本流四万十川32.27.9~8.210.22 0.001 12.20.6104801142
2009-01-01高知県本流四万十川具同9.07.3~8.220.190.00210.20.59.839003143
2009-01-01高知県支流仁井田川合流前74.67.0~7.731.71 0.029 5.31.19.55102144
2009-01-01高知県支流吉見川合流前72.01.360.1042.86145
2009-01-01高知県支流梼原川田野々大橋54.77.7~8.110.20 0.001 13.30.69.94701146
2009-01-01高知県支流広見川川崎橋34.80.350.0017.31147
2009-01-01高知県支流目黒川合流前31.50.30 0.002 17.11148
2009-01-01高知県支流黒尊川合流前25.50.190.00122.22149
2009-01-01高知県支流後川後川橋9.57.1~8.230.26 0.013 6.60.51015000150
2009-01-01高知県支流後川秋田橋13.02151
2009-01-01高知県支流中筋川坂本橋7.97.1~8.460.67 0.041 2.91.5107100152
2009-01-01高知県支流中筋川五反田橋21.03153
2010-01-01高知県本流四万十川鍛冶屋瀬橋75.57.5~8.010.33 0.010 9.50.69.92602154
2010-01-01高知県本流四万十川大正流量観測所54.27.9~8.310.280.0067.30.7102802155
2010-01-01高知県本流四万十川32.27.7~8.510.29 0.008 7.00.61016002156
2010-01-01高知県本流四万十川具同9.07.4~8.310.330.0064.30.6108402157
2010-01-01高知県支流仁井田川合流前74.67.0~7.921.63 0.062 2.811043003158
2010-01-01高知県支流吉見川合流前72.07.1~7.611.350.1342.41.99.5190005159
2010-01-01高知県支流梼原川田野々大橋54.77.7~8.410.15 0.005 9.80.7104802160
2010-01-01高知県支流広見川川崎橋34.88.0~8.930.440.0133.50.91124001161
2010-01-01高知県支流目黒川合流前31.50.36 0.005 18.02162
2010-01-01高知県支流黒尊川合流前25.50.250.00520.21163
2010-01-01高知県支流後川後川橋9.57.0~7.920.58 0.052 4.10.5102800164
2010-01-01高知県支流後川秋田橋13.01165
2010-01-01高知県支流中筋川坂本橋7.97.1~8.851.04 0.055 1.01.1112700166
2010-01-01高知県支流中筋川五反田橋21.04167
2011-01-01高知県本流四万十川鍛冶屋瀬橋75.57.3~8.010.24 0.007 6.50.6108503168
2011-01-01高知県本流四万十川大正流量観測所54.27.0~8.3<10.30.0086.40.6107003169
2011-01-01高知県本流四万十川32.27.3~8.110.24 0.008 5.70.69.92903170
2011-01-01高知県本流四万十川具同9.07.3~7.910.310.0494.70.7108003171
2011-01-01高知県支流仁井田川合流前74.67.1~7.621.12 0.055 2.60.99.78003172
2011-01-01高知県支流吉見川合流前72.07.3~7.520.640.0353.11.59.6320005173
2011-01-01高知県支流梼原川田野々大橋54.77.2~8.6<10.23 0.004 6.70.6102102174
2011-01-01高知県支流広見川川崎橋34.87.5~8.520.50.0193.50.71080001175
2011-01-01高知県支流目黒川合流前31.50.25 0.002 12.62176
2011-01-01高知県支流黒尊川合流前25.50.190.00215.42177
2011-01-01高知県支流後川後川橋9.57.1~8.030.34 0.024 2.70.5105000178
2011-01-01高知県支流後川秋田橋13.02179
2011-01-01高知県支流中筋川坂本橋7.97.0~7.890.60 0.061 1.21.39.810000180
2011-01-01高知県支流中筋川五反田橋21.05181
2012-01-01高知県本流四万十川鍛冶屋瀬橋75.57.3~7.710.39 0.012 4.30.710150002182
2012-01-01高知県本流四万十川大正流量観測所54.27.1~7.9<10.270.0124.70.61136004183
2012-01-01高知県本流四万十川32.27.6~8.110.27 0.005 4.40.71110003184
2012-01-01高知県本流四万十川具同9.07.2~8.510.270.0043.90.61018003185
2012-01-01高知県支流仁井田川合流前74.67.2~7.511.08 0.064 2.60.81020004186
2012-01-01高知県支流吉見川合流前72.07.0~7.510.940.0652.41.59.8140004187
2012-01-01高知県支流梼原川田野々大橋54.77.3~8.1<10.24 0.003 6.20.5113702188
2012-01-01高知県支流広見川川崎橋34.87.8~8.330.40.0182.10.81165002189
2012-01-01高知県支流目黒川合流前31.50.32 0.003 6.92190
2012-01-01高知県支流黒尊川合流前25.50.280.00311.94191
2012-01-01高知県支流後川後川橋9.57.2~7.820.39 0.026 3.40.5103900192
2012-01-01高知県支流後川秋田橋13.02193
2012-01-01高知県支流中筋川坂本橋7.97.0~7.880.67 0.061 0.90.710194
2012-01-01高知県支流中筋川五反田橋21.03195
2013-01-01高知県本流四万十川鍛冶屋瀬橋75.57.2~8.510.39 0.017 5.00.71122001196
2013-01-01高知県本流四万十川大正流量観測所54.27.0~8.1<10.250.015.70.91029001197
2013-01-01高知県本流四万十川32.27.6~8.310.27 0.005 4.70.59.717002198
2013-01-01高知県本流四万十川具同9.07.1~8.010.270.0064.60.51019002199
2013-01-01高知県支流仁井田川合流前74.66.6~7.830.79 0.133 2.8110120002200
2013-01-01高知県支流吉見川合流前72.07.0~7.820.920.0962.72.69.7160003201
2013-01-01高知県支流梼原川田野々大橋54.77.4~8.1<10.24 0.003 7.00.8113301202
2013-01-01高知県支流広見川川崎橋34.87.8~8.320.410.0222.30.710170001203
2013-01-01高知県支流目黒川合流前31.50.33 0.003 10.61204
2013-01-01高知県支流黒尊川合流前25.50.260.00315.61205
2013-01-01高知県支流後川後川橋9.57.0~8.020.32 0.024 2.90.5104900206
2013-01-01高知県支流後川秋田橋13.02207
2013-01-01高知県支流中筋川坂本橋7.97.1~7.680.76 0.074 1.11.31014000208
2013-01-01高知県支流中筋川五反田橋21.03209
2014-01-01高知県本流四万十川三堰79.16.6~8.210.17 0.005 7.219.835001210
2014-01-01高知県本流四万十川大正流量観測所54.26.5~8.210.250.0096.10.91012002211
2014-01-01高知県本流四万十川十川42.40.20 0.006 4.71212
2014-01-01高知県本流四万十川用井カヌー館前33.87.7~8.2<10.270.0054.30.59.721001213
2014-01-01高知県本流四万十川具同9.07.1~7.810.20 0.007 5.20.5105701214
2014-01-01高知県支流吉見川合流前72.06.9~7.520.790.0453.31.89.2170004215
2014-01-01高知県支流梼原川田野々大橋54.77.1~8.110.20 0.005 5.70.81125001216
2014-01-01高知県支流広見川川崎橋34.87.8~8.410.340.0163.30.710130001217
2014-01-01高知県支流目黒川合流前31.50.28 0.002 7.71218
2014-01-01高知県支流黒尊川合流前25.50.23<0.00112.91219
2015-01-01高知県本流四万十川三堰79.16.6~7.610.24 0.007 4.70.69.825002220
2015-01-01高知県本流四万十川大正流量観測所54.27.3~8.110.220.0084.10.81027002221
2015-01-01高知県本流四万十川十川42.40.23 0.007 3.63222
2015-01-01高知県本流四万十川用井カヌー館前33.87.6~9.010.260.0073.40.7113501223
2015-01-01高知県本流四万十川具同9.07.1~7.610.21 0.007 5.80.61013003224
2015-01-01高知県支流吉見川合流前72.06.5~7.710.730.0523.20.99.5150003225
2015-01-01高知県支流梼原川田野々大橋54.77.3~8.210.23 0.005 4.20.71015001226
2015-01-01高知県支流広見川川崎橋34.87.5~9.120.330.0222.51.51111002227
2015-01-01高知県支流目黒川合流前31.50.30 0.003 4.61228
2015-01-01高知県支流黒尊川合流前25.50.180.00113.41229
2016-01-01高知県本流四万十川三堰79.16.8~7.5<10.19 0.005 8.10.61012002230
2016-01-01高知県本流四万十川大正流量観測所54.26.8~7.810.170.00410.10.7116601231
2016-01-01高知県本流四万十川十川42.40.18 0.004 6.72232
2016-01-01高知県本流四万十川用井カヌー館前33.87.2~8.610.170.0036.20.7109101233
2016-01-01高知県本流四万十川具同9.07.2~8.020.20 0.004 10.00.61014002234
2016-01-01高知県支流吉見川合流前72.06.9~7.610.660.0524.719.882003235
2016-01-01高知県支流梼原川田野々大橋54.76.7~7.910.15 0.001 8.60.7116201236
2016-01-01高知県支流広見川川崎橋34.87.0~8.910.330.0143.50.71011002237
2016-01-01高知県支流目黒川合流前31.50.23 0.001 9.61238
2016-01-01高知県支流黒尊川合流前25.50.17017.41239
2017-01-01高知県本流四万十川三堰79.16.4~7.520.19 0.004 8.40.59.921001240
2017-01-01高知県本流四万十川大正流量観測所54.26.8~8.110.190.00311.30.6117601241
2017-01-01高知県本流四万十川十川42.40.19 0.002 7.42242
2017-01-01高知県本流四万十川用井カヌー館前33.86.8~8.610.170.0017.50.69.95001243
2017-01-01高知県本流四万十川具同9.07.1~8.610.23 0.005 9.70.6105702244
2017-01-01高知県支流吉見川合流前72.06.7~7.410.840.062.90.910260002245
2017-01-01高知県支流梼原川田野々大橋54.77.1~8.210.17 0.001 9.10.5115101246
2017-01-01高知県支流広見川川崎橋34.86.7~8.820.380.0163.90.6119801247
2017-01-01高知県支流目黒川合流前31.50.24 0.000 11.21248
2017-01-01高知県支流黒尊川合流前25.50.19019.41249
2018-01-01高知県本流四万十川三堰79.17.0~7.910.16 0.003 8.30.69.713001250
2018-01-01高知県本流四万十川大正流量観測所54.26.8~8.310.160.0056.70.5104901251
2018-01-01高知県本流四万十川十川42.40.16 0.004 6.42252
2018-01-01高知県本流四万十川用井カヌー館前33.87.4~8.310.150.0046.00.6106902253
2018-01-01高知県本流四万十川具同9.07.5~8.110.20 0.004 6.00.69.65002254
2018-01-01高知県支流吉見川合流前72.07.1~7.721.040.092.70.99.9380003255
2018-01-01高知県支流梼原川田野々大橋54.76.8~8.3<10.14 0.003 6.30.5109002256
2018-01-01高知県支流広見川川崎橋34.86.8~8.520.40.0123.30.71016001257
2018-01-01高知県支流目黒川合流前31.50.25 0.001 9.31258
2018-01-01高知県支流黒尊川合流前25.50.150.00116.31259
2019-01-01高知県本流四万十川三堰79.17.6~7.810.18 0.007 5.0<0.5118301260
2019-01-01高知県本流四万十川大正流量観測所54.27.5~8.210.20.0065.50.5107001261
2019-01-01高知県本流四万十川十川42.40.22 0.004 4.12262
2019-01-01高知県本流四万十川用井カヌー館前33.87.8~8.010.20.0044.2<0.51010002263
2019-01-01高知県本流四万十川具同9.07.5~7.910.21 0.004 3.70.59.59902264
2019-01-01高知県支流吉見川合流前72.07.3~7.520.770.0652.90.510490003265
2019-01-01高知県支流梼原川田野々大橋54.77.8~8.310.16 0.002 5.5<0.51116001266
2019-01-01高知県支流広見川川崎橋34.87.9~8.320.310.0122.90.51052001267
2019-01-01高知県支流目黒川合流前31.50.30 0.002 6.42268
2019-01-01高知県支流黒尊川合流前25.50.180.00114.71269
2020-01-01高知県本流四万十川三堰79.17.5~7.910.24 0.009 4.6<0.51012001270
2020-01-01高知県本流四万十川大正流量観測所54.27.7~8.4<10.20.0094.9<0.51114001271
2020-01-01高知県本流四万十川十川42.40.19 0.006 4.31272
2020-01-01高知県本流四万十川用井カヌー館前33.87.8~8.210.230.0083.90.614201273
2020-01-01高知県本流四万十川具同9.07.3~8.310.20 0.007 3.50.519402274
2020-01-01高知県支流吉見川合流前72.07.2~7.720.860.0782.60.7292003275
2020-01-01高知県支流梼原川田野々大橋54.77.8~8.4<10.18 0.005 4.3<0.5<110001276
2020-01-01高知県支流広見川川崎橋34.88.1~8.720.310.0172.30.6218001277
2020-01-01高知県支流目黒川合流前31.50.26 0.004 7.51278
2020-01-01高知県支流黒尊川合流前25.50.180.00311.81279
2019-05-31東洋技研本流四万十川鍛冶屋瀬橋75.522.019.60.5流心7.610.240.011<0.59.8790.00280
2019-07-24東洋技研本流四万十川鍛冶屋瀬橋75.531.820.60.5流心7.6<10.190.009<0.59.7281
2019-09-25東洋技研本流四万十川鍛冶屋瀬橋75.529.222.20.5流心7.610.240.007<0.59.51,300.00282
2019-11-06東洋技研本流四万十川鍛冶屋瀬橋75.518.815.50.5流心7.6<10.16<0.003<0.510.21,100.00283
2020-01-22東洋技研本流四万十川鍛冶屋瀬橋75.58.88.00.5流心7.6<10.210.004<0.512.9140.00284
2020-03-05東洋技研本流四万十川鍛冶屋瀬橋75.55.89.30.5流心7.6<10.47<0.003<0.511.3285

出典:高知県HP「水質環境の公表」https://www.pref.kochi.lg.jp/soshiki/030801/mizu-public.html、高知県HP「四万十川条例第23条に基づく『清流基準』について」https://www.pref.kochi.lg.jp/soshiki/030701/2017100600014.html

その他資料提供:高知県