Categories of Water Quality in Distribution System -
| Sl.no | Quality of supply | Results from routine samples(cells /100ml) | |
| Total coliform | E.coli | ||
| 1. | Excellent | 0 | 0 |
| 2. | Satisfactory | 1-3 | 0 |
| 3. | Intermediate | 4-9 | 0 |
| 4. | Unsatisfactory | 10 and /or | >1 |
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