Essential Characteristics |
BIS Requirement |
BIS Permissible Limit |
WHO Guidelines |
Colour (In Hazen Units) |
5 |
25 |
15 |
Odour |
Unobjectionable |
- |
- |
Taste |
Agreeable |
- |
- |
Turbidity |
5 |
10 |
5 |
pH |
6.5-8.5 |
6.5-8.5 |
- |
Total Hardness (as CACO3) |
300 |
600 |
- |
Iron (as Fe) |
0.3 |
1.0 |
0.3 |
Chlorides (as Cl) |
250 |
1000 |
250 |
Residual Free Chlorine |
0.2 |
- |
- |
Desirable Characteristics |
|
|
|
Dissolved Solids |
500 |
2000 |
1000 |
Calcium |
75 |
200 |
- |
Copper |
0.05 |
1.5 |
2 |
Manganese |
0.1 |
0.3 |
0.5 |
Sulphate |
200 |
400 |
250 |
Nitrate |
45 |
100 |
50 |
Flouride |
1.0 |
1.5 |
1.5 |
Phenolic Compounds |
0.001 |
0.002 |
- |
Mercury |
0.001 |
0.001 |
0.001 |
Cadmium |
0.01 |
0.01 |
0.003 |
Selenium |
0.01 |
0.01 |
0.01 |
Arsenic |
0.05 |
0.05 |
0.01 |
Cyanide |
0.05 |
0.05 |
0.07 |
Lead |
0.05 |
0.05 |
0.01 |
Zinc |
5 |
15 |
3 |
Anionic Detergents |
0.2 |
1.0 |
- |
Chromium |
0.05 |
0.05 |
0.05 |
Polynuclear aromatic hydrocarbons |
- |
- |
- |
Mineral Oil |
0.01 |
0.03 |
|
Pesticides |
Absent |
0.001 |
- |
Alkalinity |
200 |
600 |
- |
Aluminium |
0.03 |
0.2 |
0.2 |
Boron |
1 |
5 |
0.3 |
Radioactive Materials |
- |
|
|
- Alpha emitters
- Beta emitters
|
- |
0.1
1 |
0.1
1 |
