| Denomination |
1995 |
1996 |
1997 |
1998 |
1999 |
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
2009 |
2010 |
2011 |
2012 |
2013 |
2014 |
2015 |
2016 |
2017 |
2018 |
2019 |
2020 |
2021 |
2022 |
2023 |
| River DANUBE, sampling station Rajka |
| Stream flow, m³/s |
293.0 |
388.0 |
493.0 |
380.5 |
439.0 |
429.0 |
481.0 |
500.0 |
410.0 |
389.0 |
418.0 |
853.0 |
426.7 |
376.4 |
432.3 |
418.3 |
384.0 |
479.0 |
539.3 |
404.4 |
418.3 |
361.3 |
649.8 |
375.1 |
404.3 |
400.5 |
417.9 |
377.6 |
439.3 |
| Water temperature, °C |
11.2 |
9.5 |
10.7 |
11.8 |
10.7 |
11.8 |
11.1 |
11.0 |
11.8 |
10.1 |
11.0 |
9.8 |
11.7 |
11.9 |
10.8 |
10.2 |
11.3 |
11.0 |
11.3 |
11.4 |
11.3 |
11.5 |
11.0 |
12.4 |
10.8 |
11.9 |
11.3 |
12.4 |
12.4 |
| Acidity, pH |
8.0 |
8.2 |
8.3 |
8.2 |
8.1 |
8.1 |
8.2 |
8.1 |
8.0 |
8.2 |
8.0 |
7.9 |
8.0 |
8.0 |
8.0 |
8.2 |
8.2 |
8.2 |
8.2 |
.. |
.. |
.. |
.. |
.. |
.. |
8.1 |
8.2 |
8.2 |
8.1 |
| Dissolved oxygen, mg O2/l |
9.6 |
9.7 |
10.8 |
9.5 |
9.7 |
9.7 |
9.5 |
10.4 |
10.5 |
11.5 |
10.7 |
11.2 |
10.4 |
10.8 |
11.1 |
10.9 |
10.8 |
10.9 |
11.8 |
10.7 |
10.7 |
11.8 |
11.6 |
11.1 |
10.8 |
9.4 |
10.4 |
10.9 |
10.4 |
| Oxygen saturation, % |
87.0 |
84.0 |
98.0 |
88.0 |
86.0 |
89.0 |
86.0 |
93.3 |
96.5 |
102.9 |
95.9 |
97.1 |
94.5 |
99.5 |
99.1 |
96.2 |
96.6 |
97.3 |
106.6 |
96.7 |
96.5 |
107.4 |
103.3 |
102.4 |
101.3 |
89.5 |
93.5 |
99.0 |
97.6 |
| Biochemical oxygen demand, BOD5 (20°C, 5d), mg O2/l |
2.1 |
2.6 |
2.7 |
2.6 |
2.1 |
1.6 |
1.8 |
2.9 |
2.5 |
2.2 |
2.7 |
2.5 |
2.2 |
3.5 |
3.5 |
2.6 |
3.8 |
4.1 |
4.6 |
3.8 |
3.7 |
3.0 |
3.4 |
3.3 |
3.3 |
2.7 |
2.9 |
4.5 |
3.0 |
| Chemical oxygen demand, COD (K2Cr2O7), mg O2/l |
12.0 |
13.0 |
10.0 |
10.0 |
10.0 |
10.0 |
10.0 |
10.1 |
9.3 |
9.7 |
9.8 |
11.0 |
9.0 |
9.3 |
9.8 |
10.2 |
8.5 |
8.8 |
10.3 |
9.0 |
7.1 |
8.4 |
8.7 |
6.9 |
6.3 |
8.5 |
8.3 |
9.0 |
8.9 |
| Total suspended solid, mg/l |
42.0 |
29.0 |
42.0 |
17.0 |
34.0 |
36.0 |
27.0 |
26.9 |
17.5 |
18.6 |
33.6 |
69.0 |
29.0 |
19.1 |
35.0 |
34.4 |
20.2 |
38.1 |
61.1 |
42.3 |
17.3 |
25.0 |
35.6 |
21.8 |
29.9 |
10.6 |
22.8 |
29.7 |
22.3 |
| Chloride, mg/l |
252.0 |
274.0 |
254.0 |
244.0 |
261.0 |
248.0 |
289.0 |
263.4 |
248.9 |
268.5 |
262.2 |
284.7 |
242.4 |
236.7 |
248.3 |
291.9 |
274.9 |
230.9 |
261.9 |
265.4 |
261.7 |
255.9 |
258.8 |
237.1 |
233.6 |
.. |
249.8 |
.. |
241.0 |
| Total nitrogen, µg N/l |
3,100.0 |
3,320.0 |
2,653.0 |
4,456.0 |
3,882.0 |
3,850.0 |
3,600.0 |
3,506.3 |
2,912.8 |
3,260.9 |
2,356.9 |
2,726.2 |
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 |
1,950.8 |
1,283.3 |
2,524.2 |
2,090.0 |
1,868.0 |
| Nitrates (NO3), µg NO3/l |
9,228.5 |
11,464.9 |
8,981.5 |
8,431.3 |
9,390.3 |
8,510.0 |
8,300.0 |
9,060.5 |
8,523.3 |
8,637.4 |
8,276.3 |
8,581.2 |
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 |
6,833.3 |
4,342.0 |
8,540.0 |
6,980.0 |
6,510.0 |
| Ammonium (NH4), µg N/l |
90.0 |
86.0 |
78.0 |
74.0 |
72.0 |
80.0 |
63.8 |
80.7 |
52.3 |
64.1 |
46.5 |
46.2 |
34.2 |
25.8 |
39.2 |
50.0 |
40.0 |
32.3 |
75.8 |
50.0 |
57.5 |
66.7 |
42.5 |
60.0 |
.. |
26.0 |
33.8 |
50.0 |
40.0 |
| Total phosphorus, µg P/l |
95.0 |
92.0 |
107.0 |
99.0 |
119.0 |
105.0 |
115.0 |
135.2 |
83.5 |
105.1 |
151.9 |
253.8 |
97.5 |
75.0 |
109.2 |
120.0 |
93.3 |
108.3 |
111.7 |
104.2 |
69.2 |
90.0 |
92.5 |
80.0 |
95.8 |
40.0 |
85.0 |
126.3 |
123.8 |
| Orthophosphates, µg P/l |
74.0 |
71.0 |
43.0 |
44.0 |
37.0 |
50.0 |
40.0 |
42.7 |
29.4 |
37.7 |
43.5 |
95.5 |
41.1 |
32.1 |
45.3 |
37.7 |
30.4 |
48.3 |
127.5 |
115.8 |
120.0 |
104.2 |
105.8 |
110.8 |
91.7 |
90.0 |
98.3 |
140.0 |
110.0 |
| Chlorophyll-a (summer), µg/l |
11.4 |
19.8 |
22.2 |
30.5 |
23.4 |
16.6 |
20.9 |
17.7 |
15.1 |
22.5 |
22.6 |
14.8 |
16.4 |
19.1 |
3.4 |
6.4 |
5.5 |
3.4 |
10.0 |
9.9 |
4.3 |
4.5 |
6.5 |
5.8 |
4.2 |
5.1 |
5.9 |
5.4 |
4.0 |
| Coliform-counts, n/100 ml |
1,150.0 |
1,293.0 |
469.0 |
1,796.0 |
902.0 |
580.0 |
850.0 |
1,485.5 |
436.7 |
401.7 |
460.0 |
600.0 |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
| River DRÁVA, sampling station Drávaszabolcs |
| Stream flow, m³/s |
479.0 |
598.0 |
437.0 |
513.0 |
588.0 |
549.0 |
464.0 |
410.6 |
348.8 |
501.6 |
474.1 |
326.7 |
338.0 |
483.5 |
627.9 |
633.4 |
442.4 |
528.3 |
638.5 |
714.9 |
459.2 |
269.7 |
359.7 |
446.4 |
259.8 |
535.5 |
478.4 |
319.1 |
636.0 |
| Water temperature, °C |
12.1 |
11.9 |
12.5 |
12.6 |
12.7 |
13.1 |
13.3 |
13.6 |
13.9 |
12.3 |
12.6 |
5.8 |
13.2 |
13.1 |
12.4 |
12.5 |
11.8 |
12.7 |
12.5 |
13.2 |
15.4 |
12.2 |
12.8 |
15.8 |
12.9 |
12.8 |
12.5 |
14.1 |
13.6 |
| Acidity, pH |
8.2 |
8.2 |
8.2 |
8.1 |
8.1 |
8.2 |
8.2 |
8.1 |
8.0 |
8.0 |
8.0 |
7.9 |
.. |
.. |
.. |
.. |
.. |
8.2 |
8.3 |
.. |
.. |
.. |
.. |
.. |
.. |
8.2 |
8.0 |
8.2 |
8.2 |
| Dissolved oxygen, mg O2/l |
9.8 |
10.6 |
10.1 |
9.8 |
9.8 |
9.5 |
9.8 |
9.8 |
10.8 |
9.9 |
9.9 |
11.6 |
9.8 |
9.6 |
9.1 |
9.1 |
10.0 |
9.9 |
9.6 |
9.6 |
9.6 |
8.5 |
9.7 |
8.1 |
7.5 |
10.8 |
9.0 |
8.1 |
9.5 |
| Oxygen saturation, % |
91.0 |
97.0 |
93.0 |
91.0 |
91.0 |
89.0 |
93.0 |
92.8 |
103.9 |
90.5 |
90.9 |
92.2 |
92.1 |
89.8 |
84.5 |
83.4 |
90.3 |
92.1 |
88.9 |
91.2 |
95.7 |
77.7 |
90.2 |
79.8 |
72.5 |
99.4 |
85.2 |
77.6 |
91.4 |
| Biochemical oxygen demand, BOD5 (20°C, 5d), mg O2/l |
3.5 |
3.1 |
3.3 |
3.0 |
2.9 |
2.9 |
2.6 |
2.3 |
3.0 |
2.4 |
2.1 |
3.6 |
1.6 |
1.7 |
1.3 |
1.8 |
2.1 |
2.1 |
2.2 |
1.6 |
2.4 |
2.1 |
2.8 |
3.7 |
4.6 |
4.0 |
2.3 |
3.1 |
3.5 |
| Chemical oxygen demand, COD (K2Cr2O7), mg O2/l |
9.0 |
11.0 |
9.0 |
9.0 |
11.0 |
8.0 |
7.0 |
7.1 |
8.4 |
7.7 |
8.8 |
10.0 |
9.2 |
8.9 |
9.6 |
10.6 |
7.5 |
9.1 |
8.8 |
8.5 |
9.6 |
13.0 |
9.4 |
14.4 |
15.5 |
8.1 |
8.1 |
9.2 |
9.1 |
| Total suspended solid, mg/l |
25.0 |
21.0 |
15.0 |
22.0 |
30.0 |
17.0 |
14.0 |
12.6 |
11.5 |
9.7 |
18.3 |
11.0 |
14.0 |
.. |
.. |
.. |
9.3 |
16.6 |
17.5 |
20.8 |
13.9 |
11.2 |
11.7 |
19.0 |
14.1 |
32.8 |
13.3 |
17.2 |
29.3 |
| Chloride, mg/l |
230.0 |
211.0 |
240.0 |
232.0 |
298.0 |
.. |
.. |
180.0 |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
243.3 |
215.3 |
205.2 |
205.2 |
214.7 |
217.8 |
219.7 |
.. |
.. |
238.0 |
.. |
.. |
.. |
| Total nitrogen |
2,600.0 |
2,594.0 |
1,989.0 |
2,241.0 |
1,975.0 |
1,710.0 |
1,630.0 |
1,697.5 |
1,638.9 |
1,684.3 |
1,700.0 |
2,330.0 |
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 |
1,360.0 |
2,000.9 |
1,350.0 |
1,609.1 |
1,481.8 |
| Nitrates (NO3), µg NO3/l |
8,180.0 |
7,240.0 |
6,060.0 |
6,300.0 |
6,500.0 |
5,370.0 |
5,000.0 |
5,241.7 |
5,029.1 |
5,865.4 |
6,316.7 |
6,320.4 |
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 |
2,725.0 |
7,418.0 |
4,430.0 |
4,340.0 |
5,250.0 |
| Ammonium (NH4), µg N/l |
70.0 |
53.0 |
67.0 |
55.0 |
47.0 |
60.0 |
50.0 |
75.8 |
79.6 |
43.5 |
50.8 |
56.9 |
39.1 |
39.2 |
52.5 |
50.0 |
50.0 |
49.1 |
76.7 |
107.3 |
70.5 |
65.2 |
69.2 |
78.1 |
.. |
34.0 |
52.5 |
84.5 |
60.0 |
| Total phosphorus, µg P/l |
129.0 |
156.0 |
135.0 |
120.0 |
143.0 |
119.0 |
95.0 |
97.1 |
82.7 |
83.5 |
85.4 |
84.3 |
74.3 |
86.3 |
90.8 |
41.9 |
72.0 |
83.2 |
70.4 |
83.8 |
.. |
.. |
.. |
.. |
.. |
90.0 |
.. |
.. |
.. |
| Orthophosphates, µg P/l |
58.0 |
50.0 |
46.0 |
60.0 |
59.0 |
60.0 |
45.0 |
39.5 |
30.2 |
45.0 |
44.9 |
41.2 |
40.0 |
36.8 |
37.5 |
72.8 |
128.7 |
46.0 |
113.3 |
115.5 |
108.4 |
173.3 |
101.5 |
328.1 |
121.0 |
94.0 |
73.3 |
87.2 |
80.0 |
| Chlorophyll-a (summer), µg/l |
8.6 |
19.2 |
13.3 |
10.9 |
8.7 |
10.4 |
14.9 |
15.8 |
32.9 |
8.8 |
10.6 |
9.3 |
12.8 |
7.0 |
5.2 |
8.0 |
7.2 |
7.8 |
6.9 |
3.6 |
10.5 |
8.2 |
6.9 |
9.1 |
31.8 |
7.9 |
7.8 |
10.0 |
8.6 |
| Coliform-counts, n/100 ml |
3,070.0 |
3,539.6 |
1,248.3 |
724.8 |
790.8 |
1,450.0 |
390.0 |
395.9 |
1,215.0 |
203.8 |
793.3 |
140.0 |
78.0 |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
| River TISZA, sampling station Tiszabecs |
| Stream flow, m³/s |
286.0 |
173.0 |
204.0 |
288.0 |
212.0 |
161.0 |
375.0 |
256.2 |
109.2 |
232.7 |
190.5 |
223.6 |
215.0 |
258.0 |
172.0 |
272.0 |
142.0 |
135.0 |
176.0 |
111.7 |
141.0 |
160.8 |
190.8 |
156.7 |
165.1 |
174.0 |
187.8 |
192.0 |
216.8 |
| Water temperature, °C |
9.9 |
9.2 |
9.4 |
9.7 |
10.1 |
10.5 |
10.4 |
10.4 |
10.1 |
10.0 |
9.5 |
10.5 |
13.9 |
10.9 |
12.2 |
11.0 |
11.3 |
13.1 |
13.0 |
13.3 |
13.4 |
13.2 |
11.9 |
13.3 |
14.1 |
14.3 |
11.4 |
11.3 |
12.1 |
| Acidity, pH |
7.9 |
7.9 |
7.8 |
7.8 |
7.6 |
7.8 |
7.8 |
7.8 |
7.7 |
7.7 |
7.6 |
7.6 |
7.6 |
7.6 |
8.0 |
8.0 |
7.9 |
7.8 |
7.8 |
.. |
.. |
.. |
.. |
.. |
.. |
8.0 |
8.1 |
8.1 |
8.1 |
| Dissolved oxygen, mg O2/l |
11.3 |
11.1 |
12.6 |
12.1 |
12.7 |
14.0 |
14.2 |
14.5 |
17.4 |
12.8 |
12.0 |
9.9 |
10.1 |
11.7 |
10.6 |
11.1 |
12.0 |
.. |
13.7 |
13.6 |
8.9 |
10.4 |
10.8 |
10.5 |
9.9 |
10.4 |
10.7 |
10.4 |
10.5 |
| Oxygen saturation, % |
98.0 |
95.0 |
110.0 |
105.0 |
112.0 |
126.0 |
128.0 |
129.6 |
152.0 |
113.7 |
105.7 |
89.4 |
94.7 |
99.2 |
97.7 |
99.8 |
100.5 |
.. |
99.0 |
93.5 |
81.9 |
95.2 |
98.4 |
99.2 |
101.6 |
100.3 |
100.9 |
98.7 |
100.3 |
| Biochemical oxygen demand, BOD5 (20°C, 5d), mg O2/l |
1.9 |
1.5 |
2.0 |
2.6 |
3.6 |
2.8 |
3.6 |
2.8 |
2.9 |
3.4 |
3.5 |
4.1 |
2.8 |
2.5 |
2.6 |
1.9 |
3.2 |
.. |
.. |
.. |
1.2 |
1.6 |
1.4 |
1.4 |
1.1 |
1.4 |
2.1 |
1.9 |
2.1 |
| Chemical oxygen demand, COD (K2Cr2O7), mg O2/l |
8.0 |
5.0 |
7.0 |
10.0 |
12.0 |
9.0 |
13.0 |
10.3 |
10.0 |
12.2 |
12.0 |
13.4 |
18.0 |
18.3 |
14.4 |
11.5 |
10.3 |
11.9 |
9.4 |
5.0 |
11.0 |
5.6 |
5.8 |
5.4 |
5.8 |
6.2 |
5.1 |
6.4 |
4.9 |
| Total suspended solid, mg/l |
54.0 |
46.0 |
54.0 |
58.0 |
36.0 |
53.0 |
163.0 |
55.4 |
27.3 |
41.2 |
68.7 |
45.9 |
26.8 |
93.9 |
54.6 |
32.9 |
59.7 |
109.3 |
44.8 |
15.3 |
100.0 |
26.6 |
29.4 |
28.8 |
51.5 |
51.8 |
45.5 |
34.0 |
35.7 |
| Chloride, mg/l |
232.0 |
261.0 |
177.0 |
182.0 |
210.0 |
224.0 |
216.0 |
219.5 |
268.8 |
240.2 |
327.4 |
313.9 |
207.0 |
207.6 |
163.6 |
165.3 |
148.3 |
137.4 |
142.2 |
146.3 |
147.8 |
150.3 |
150.8 |
164.3 |
184.6 |
167.3 |
168.5 |
145.9 |
142.3 |
| Total nitrogen |
1,030.0 |
884.0 |
828.0 |
1,000.0 |
870.0 |
860.0 |
870.0 |
1,026.2 |
880.8 |
811.5 |
758.1 |
740.4 |
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 |
920.0 |
918.2 |
808.3 |
800.0 |
808.3 |
| Nitrates (NO3), µg NO3/l |
4,100.0 |
3,410.0 |
2,920.0 |
3,390.0 |
2,840.0 |
2,660.0 |
2,770.0 |
3,500.0 |
2,940.0 |
3,103.8 |
2,819.2 |
2,750.0 |
2,316.1 |
2,586.3 |
.. |
.. |
.. |
.. |
.. |
.. |
2,692.3 |
2,830.0 |
2,716.7 |
2,208.3 |
2,100.0 |
2,740.0 |
2,650.0 |
2,180.0 |
2,310.0 |
| Ammonium (NH4), µg N/l |
20.0 |
32.0 |
80.0 |
60.0 |
68.0 |
60.0 |
40.0 |
55.4 |
79.2 |
53.5 |
58.5 |
52.1 |
98.5 |
66.7 |
0.1 |
0.0 |
0.1 |
39.2 |
.. |
.. |
109.2 |
53.0 |
45.0 |
30.0 |
.. |
32.0 |
44.1 |
30.0 |
.. |
| Total phosphorus, µg P/l |
67.0 |
84.0 |
71.0 |
21.0 |
66.0 |
50.0 |
128.0 |
75.3 |
61.7 |
117.0 |
75.4 |
82.1 |
.. |
.. |
44.1 |
45.3 |
52.6 |
220.3 |
90.0 |
40.0 |
206.5 |
41.8 |
62.8 |
68.6 |
82.1 |
66.0 |
88.6 |
50.5 |
73.0 |
| Orthophosphates, µg P/l |
45.0 |
49.0 |
54.0 |
13.0 |
49.0 |
29.0 |
50.0 |
40.8 |
31.7 |
31.9 |
30.2 |
30.3 |
11.8 |
25.0 |
13.0 |
17.6 |
16.8 |
37.3 |
12.3 |
8.5 |
42.7 |
38.2 |
24.2 |
25.9 |
25.6 |
24.0 |
54.4 |
41.0 |
40.0 |
| Chlorophyll-a (summer), µg/l |
23.4 |
4.4 |
3.6 |
2.7 |
2.6 |
2.0 |
2.0 |
1.9 |
3.6 |
1.9 |
2.6 |
1.7 |
3.6 |
1.8 |
1.8 |
1.9 |
3.6 |
3.5 |
3.5 |
1.7 |
3.1 |
2.6 |
1.6 |
1.9 |
4.3 |
0.8 |
.. |
.. |
1.5 |
| Coliform-counts, n/100 ml |
845.0 |
525.7 |
40,271.7 |
2,863.3 |
4,471.4 |
2,040.0 |
1,390.0 |
917.5 |
1,834.3 |
1,440.0 |
646.0 |
792.5 |
725.0 |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
.. |
Source: General Directorate of Water Management, and National Environmental Protection Information System (OKIR).
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