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Question
Mention the standards prescribed by BIS for quality of drinking water.
Answer in Brief
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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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