| Water quality grade | EC (dS/m) | (TDS mg/L) |
| Non-saline water | <0.7 | <500 |
| Saline water | 0.7 - 42 | 500 - 3000 |
| Slightly saline | 0.7 - 3.0 | 5000 - 2000 |
| Medium saline | 3 - 6 | 2000 - 4000 |
| Highly saline | >6.0 | >4000 |
| Very saline | >14 | >9000 |
| Brine | >42 | >30,000 |