| Type of water | TDS value (mg/l) |
| Sweet waters | 0 - 1000 |
| Brackish waters | 1000 - 5000 |
| Moderately saline waters | 5000 - 10,000 |
| Severely saline waters | 10,000 - 30,000 |
| Seawater | More than 30,000 |