Sodium (%) | Water class | Range (% samples) |
<20 | Excellent | 7.29 - 19.82 (54.05% sample) |
20 - 40 | Good | 22.02 - 39.11 (24.32% sample) |
40 - 60 | Permissible | 41.27 - 57.87 (8.11% sample) |
60 - 80 | Doubtful | 60.09 - 78.90 (10.82% sample) |
>80 | Unsuitable | 2.70% sample) |