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To qualify in Class C category the pH range should be within 6.5- 8.5
(IS- 2296-1982)
As per Indian Standards (IS- 2296- 1982)
| Class |
pH range |
| A |
6.5- 8.5 |
| B |
6.5- 8.5 |
| C |
6.5- 8.5 |
| D |
6.5- 8.5 |
| E |
6- 8.5 |
| Below E |
Not Meeting A, B, C, D & E Criteria |
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Source: Central Pollution Control Board
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