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Indian Standards of Drinking Water
The Bureau of Indian Standards has defined the level of solvents for safety purposes. The table below gives the common solvents in water and the permitted levels.
| Substance/ Test |
Unit |
Desirable Limit |
Maximum Permissible Limit* |
| Physical Turbidity |
NTU |
5 |
10 |
| Chemical pH |
Number |
6.5-8.5 |
No relaxation |
| Hardness |
As( CaCo)mg/l |
300 |
600 |
| Chloride |
(asCl)mg/l |
250 |
1000 |
| Iron |
(as Fe)mg/l |
0.3 |
1.0 |
| Nitrate |
(as No)mg/l |
45 |
No relaxation |
| Fluoride |
(as F) mg/l |
1.0 |
1.5 |
| Residual Chlorine |
Mg/l |
0.2-0.5 |
No relaxation |
| Arsenic |
(as A)mg/l |
0.05 |
No relaxation |
| Bacteriological Coliforms |
MPN/100ml |
10** |
No relaxation |
| E Coli |
MPN/100ml |
0 |
No relaxation |
* When there is no alternative source for drinking.
** Colitone organisms should not be detectable in 100ml of any two consecutive samples.
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