5.4.4. Main surface water quality parameters of Hungarian rivers (1995–)*(2/2)

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Denomination Unit 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
River DANUBE, sampling station Rajka
Stream flow m³/s 426.7 376.4 432.3 418.3 384.0 479.0 539.3 404.4 418.3 361.3 649.8 375.1
Water temperature °C 11.7 11.9 10.8 10.2 11.3 11.0 11.3 11.4 11.3 11.5 11.0 12.4
Acidity pH 8.0 8.0 8.0 8.2 8.2 8.2 8.2 .. .. .. .. ..
Dissolved oxygen mg O2/l 10.4 10.8 11.1 10.9 10.8 10.9 11.8 10.7 10.7 11.8 11.6 11.1
Oxygen saturation % 94.5 99.5 99.1 96.2 96.6 97.3 106.6 96.7 96.5 107.4 103.3 102.4
Biochemical oxygen demand, BOD5 (20°C, 5d) mg O2/l 2.2 3.5 3.5 2.6 3.8 4.1 4.6 3.8 3.7 3.0 3.4 3.3
Chemical oxygen demand, COD (K2Cr2O7) mg O2/l 9.0 9.3 9.8 10.2 8.5 8.8 10.3 9.0 7.1 8.4 8.7 6.9
Total suspended solid mg/l 29.0 19.1 35.0 34.4 20.2 38.1 61.1 42.3 17.3 25.0 35.6 21.8
Chloride mg/l 242.4 236.7 248.3 291.9 274.9 230.9 261.9 265.4 261.7 255.9 258.8 237.1
Total nitrogen µg N/l 2 431.7 2 433.3 2 746.7 3 287.5 2 909.2 2 453.3 2 568.3 2 354.2 2 271.7 2 126.7 2 125.8 2 148.3
Nitrates (NO3) µg NO3/l 7 746.3 7 510.1 7 635.6 9 710.0 8 630.0 6 852.5 8 092.5 7 917.5 8 311.7 7 833.3 7 684.2 7 241.7
Ammonium (NH4) µg N/l 34.2 25.8 39.2 50.0 40.0 32.3 75.8 50.0 57.5 66.7 42.5 60.0
Total phosphorus µg P/l 97.5 75.0 109.2 120.0 93.3 108.3 111.7 104.2 69.2 90.0 92.5 80.0
Orthophosphates µg P/l 41.1 32.1 45.3 37.7 30.4 48.3 127.5 115.8 120.0 104.2 105.8 110.8
Chlorophyll-a (summer) µg /l 16.4 19.1 3.4 6.4 5.5 3.4 10.0 9.9 4.3 4.5 6.5 5.8
Coliform-counts n/100 ml .. .. .. .. .. .. .. .. .. .. .. ..
River DRÁVA, sampling station Drávaszabolcs
Stream flow m³/s 338.0 483.5 627.9 633.4 442.4 528.3 638.5 714.9 459.2 269.7 359.7 446.4
Water temperature °C 13.2 13.1 12.4 12.5 11.8 12.7 12.5 13.2 15.4 12.2 12.8 15.8
Acidity pH .. .. .. .. .. 8.2 8.3 .. .. .. .. ..
Dissolved oxygen mg O2/l 9.8 9.6 9.1 9.1 10.0 9.9 9.6 9.6 9.6 8.5 9.7 8.1
Oxygen saturation % 92.1 89.8 84.5 83.4 90.3 92.1 88.9 91.2 95.7 77.7 90.2 79.8
Biochemical oxygen demand, BOD5 (20°C, 5d) mg O2/l 1.6 1.7 1.3 1.8 2.1 2.1 2.2 1.6 2.4 2.1 2.8 3.7
Chemical oxygen demand, COD (K2Cr2O7) mg O2/l 9.2 8.9 9.6 10.6 7.5 9.1 8.8 8.5 9.6 13.0 9.4 14.4
Total suspended solid mg/l 14.0 .. .. .. 9.3 16.6 17.5 20.8 13.9 11.2 11.7 19.0
Chloride mg/l .. .. .. .. 243.3 215.3 205.2 205.2 214.7 217.8 219.7 ..
Total nitrogen µg N/l 1 741.4 1 620.8 1 700.8 .. 1 378.7 1 332.7 1 579.2 1 416.3 1 364.2 1 275.9 1 349.2 1 376.3
Nitrates (NO3) µg NO3/l 5 111.5 4 588.0 5 404.3 5 650.0 4 610.0 4 372.7 5 079.2 4 018.2 4 431.6 3 883.3 4 553.8 3 462.5
Ammonium (NH4) µg N/l 39.1 39.2 52.5 50.0 50.0 49.1 76.7 107.3 70.5 65.2 69.2 78.1
Total phosphorus µg P/l 74.3 86.3 90.8 41.9 72.0 83.2 70.4 83.8 .. .. .. ..
Orthophosphates µg P/l 40.0 36.8 37.5 72.8 128.7 46.0 113.3 115.5 108.4 173.3 101.5 328.1
Chlorophyll-a (summer) µg /l 12.8 7.0 5.2 8.0 7.2 7.8 6.9 3.6 10.5 8.2 6.9 9.1
Coliform-counts n/100 ml 78.0 .. .. .. .. .. .. .. .. .. .. ..
River TISZA, sampling station Tiszabecs
Stream flow m³/s 215.0 258.0 172.0 272.0 142.0 135.0 176.0 .. .. .. .. ..
Water temperature °C 13.9 10.9 12.2 11.0 11.3 13.1 13.0 13.3 13.4 13.2 11.9 13.3
Acidity pH 7.6 7.6 8.0 8.0 7.9 7.8 7.8 .. .. .. .. ..
Dissolved oxygen mg O2/l 10.1 11.7 10.6 11.1 12.0 .. 13.7 13.6 8.9 10.4 10.8 10.5
Oxygen saturation % 94.7 99.2 97.7 99.8 100.5 .. 99.0 93.5 81.9 95.2 98.4 99.2
Biochemical oxygen demand, BOD5 (20°C, 5d) mg O2/l 2.8 2.5 2.6 1.9 3.2 .. .. .. 1.2 1.6 1.4 1.4
Chemical oxygen demand, COD (K2Cr2O7) mg O2/l 18.0 18.3 14.4 11.5 10.3 11.9 9.4 5.0 11.0 5.6 5.8 5.4
Total suspended solid mg/l 26.8 93.9 54.6 32.9 59.7 109.3 44.8 15.3 100.0 26.6 29.4 28.8
Chloride mg/l 207.0 207.6 163.6 165.3 148.3 137.4 142.2 146.3 147.8 150.3 150.8 164.3
Total nitrogen µg N/l 1 409.0 1 880.0 793.1 850.0 1 530.0 971.4 .. .. 1 000.0 880.0 872.7 1 100.0
Nitrates (NO3) µg NO3/l 2 316.1 2 586.3 .. .. .. .. .. .. 2 692.3 2 830.0 2 716.7 2 208.3
Ammonium (NH4) µg N/l 98.5 66.7 0.1 0.0 0.1 39.2 .. .. 109.2 53.0 45.0 30.0
Total phosphorus µg P/l .. .. 44.1 45.3 52.6 220.3 90.0 40.0 206.5 41.8 62.8 68.6
Orthophosphates µg P/l 11.8 25.0 13.0 17.6 16.8 37.3 12.3 8.5 42.7 38.2 24.2 25.9
Chlorophyll-a (summer) µg /l 3.6 1.8 1.8 1.9 3.6 3.5 3.5 1.7 3.1 2.6 1.6 1.9
Coliform-counts n/100 ml 725.0 .. .. .. .. .. .. .. .. .. .. ..
*Source: VITUKI Kht. Arithmetic mean values.  Revised data 

© Hungarian Central Statistical Office, 2011