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Question
Mention the standards prescribed by BIS for quality of drinking water.
Solution
Standard characteristics prescribed for deciding the quality of drinking water by BIS, in 1991 are shown in Table.
| S.No | Characteristics | Desirable limit |
| I. | Physico-chemical Characteristics | |
| i) | pH | 6.5 to 8.5 |
| ii) | Total Dissolved Solids (TDS) | 500 ppm |
| iii) | Total Hardness (as CaCO, | 300 ppm |
| iv) | Nitrate | 45 ppm |
| v) | Chloride | 250 ppm |
| vi) | Sulphate | 200 ppm |
| vii) | Fluoride | 1 ppm |
| II. | Biological Characteristics | |
| i) | Escherichia Coli (E.Coli) | Not at all |
| ii) | Coliforms | Not to exceed 10 (In 100 ml water sample) |
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