| Value | Category | Cases | |
|---|---|---|---|
| 1 | Soft: < 60 mg/L | 770 |
27.7%
|
| 2 | Moderately hard: 60-180 mg/L | 1060 |
38.2%
|
| 3 | Hard: 180-300 mg/L | 451 |
16.2%
|
| 4 | Very hard: >300 mg/L | 497 |
17.9%
|
| Sysmiss | 1910 |