№
Water body
Monitoring point
IWP
Degree of water quality
1
The Chirchik River
Below the Tashkent city
5,72
V
– Dirty
2
Karasu Canal
Below the Tashkent city
0,62
II
– Clean
3
Bozsu Canal
Below the Tashkent city
0,82
II
– Clean
4
Salor Canal
Above the Tashkent city
1,06
III
– Moderately polluted
5
Bozsu Canal
Above the Tashkent city
0,78
II
– Clean
6
Zerafshan River
Above the Navoi city
0,70
II
– Clean
7
Zerafshan River
Above the Navoi city
0,98
II
– Clean
Criteria of water pollution based on the Index of Water Pollution and criteria for improvement (deterioration) of water quality
Degree of water quality
Textual description
Level of the IWP
Information on the possible use of water
I
Very clean
less than 0.3
II
Clean
from 0.3 to 1.0
III
Moderately polluted
from 0.3 to 1.0
IV
Polluted
from 2.5 to 4.0
V
Dirty
from 4.0 to 6.0
VI
Very dirty
from 6.0 to 10.0
VII
Extremely dirty
from 10.0 and high