The maximum permissible limit of sulphate (as SO4) concentration present in drinking water in the absence of an alternate source of water as per IS code 10500-2012 is:
400 mg/l
Sulphate Concentration in Drinking Water
Understanding the permissible limits of various chemical parameters in drinking water is crucial for ensuring public health. The Indian Standard (IS) code 10500-2012, titled "Drinking Water - Specification (Second Revision)", provides guidelines for the quality of drinking water in India. This standard specifies two types of limits for many parameters: an acceptable limit and a maximum permissible limit in the absence of an alternate source.
Drinking Water Standards for Sulphate
For sulphate (as \(\text{SO}_4\)) concentration in drinking water, IS code 10500-2012 sets specific standards. Sulphate is naturally present in water and can also originate from industrial discharges and domestic waste. High concentrations can have a laxative effect, especially when combined with magnesium.
- The acceptable limit for sulphate concentration in drinking water, under normal circumstances, is 200 mg/l. This is the recommended limit for palatability and general consumer acceptance.
- However, in situations where there is no alternative source of water available, the standard allows for a higher concentration up to a certain maximum permissible limit.
Maximum Permissible Sulphate Limit
As per IS code 10500-2012, the maximum permissible limit of sulphate (as \(\text{SO}_4\)) concentration in drinking water, specifically when an alternate source of water is not available, is 400 mg/l. This higher limit is permitted only under dire circumstances to ensure access to water, even if it is slightly less desirable in taste or has mild effects compared to water meeting the acceptable limit.
The following table summarizes the sulphate limits as per the IS code 10500-2012:
| Parameter | Acceptable Limit (\(\text{mg/l}\)) | Maximum Permissible Limit (in absence of alternate source) (\(\text{mg/l}\)) |
|---|---|---|
| Sulphate (as \(\text{SO}_4\)) | 200 | 400 |
Therefore, for drinking water, when no alternative water source is present, the highest allowable concentration of sulphate (as \(\text{SO}_4\)) is \(\text{400 mg/l}\).
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