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To qualify for Class C category the BOD should be 3 mg/l or less (IS-
2296-1982)
| Class |
Required BOD value |
| A |
2 mg/l or less |
| B |
3 mg/l or less |
| C |
3 mg/l or less |
| D |
2.2 mg/l or less |
| E |
NA |
| Below E |
Not meeting above criteria |
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Source: Central Pollution Control Board
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