|
Sl.
No.
|
Parameters
|
Units
|
Drinking
Water
IS:
10500 - 1991
|
|
Desirable
|
Maximum
|
|
1.
|
Colour
|
Hazen
units
|
5
|
25
|
|
2.
|
Odour
|
-
|
Unobjectionable
|
-
|
|
3.
|
Taste
|
-
|
Agreeable
|
-
|
|
4.
|
Turbidity
|
NTU
|
5
|
10
|
|
5.
|
pH
value
|
-
|
6.5
to 8.5
|
No
relaxation
|
|
6.
|
Total
hardness (as CaCO3)
|
mg/l
|
300
|
600
|
|
7.
|
Iron
|
mg/l
|
0.3
|
1.0
|
|
8.
|
Chlorides
|
mg/l
|
250
|
1000
|
|
9.
|
Residual,
free Chlorine
|
mg/l
|
0.2
|
-
|
|
10.
|
Dissolved
Solids
|
mg/l
|
500
|
2000
|
|
11.
|
Calcium
|
mg/l
|
75
|
200
|
|
12.
|
Copper
|
mg/l
|
0.05
|
1.5
|
|
13.
|
Manganese
|
mg/l
|
0.1
|
0.3
|
|
14.
|
Sulphate
|
mg/l
|
200
|
400
|
|
15.
|
Nitrate
|
mg/l
|
50
|
No
relaxation
|
|
16.
|
Fluoride
|
mg/l
|
1.0
|
1.5
|
|
17.
|
Phenolic
compounds
|
mg/l
|
0.001
|
0.002
|
|
18.
|
Mercury
|
mg/l
|
0.001
|
No
relaxation
|
|
19.
|
Cadmium
|
mg/l
|
0.01
|
No
relaxation
|
|
20.
|
Selenium
|
mg/l
|
0.01
|
No
relaxation
|
|
21.
|
Arsenic
|
mg/l
|
0.05
|
No
relaxation
|
|
22.
|
Cyanide
|
mg/l
|
0.05
|
No
relaxation
|
|
23.
|
Lead
|
mg/l
|
0.05
|
No
relaxation
|
|
24.
|
Zinc
|
mg/l
|
5
|
15
|
|
25.
|
Anionic
detergents
|
mg/l
|
0.2
|
1.0
|
|
26.
|
Chromium
|
mg/l
|
0.05
|
No
relaxation
|
|
27.
|
Polynuclear
aromatic Hydrocarbons
|
mg/l
|
-
|
-
|
|
28.
|
Mineral
oil
|
mg/l
|
0.01
|
0.03
|
|