| Station Name | N | Ca mg/l Mean (Std) | Mg mg/l Mean (Std) | TH mg/l Mean (Std) | Relative Ranking |
| DW supply | 26 | 90.3 (1.2) | 31.2 (3.3) | 359 (19) | - |
| S1 | 7 | 10.7 (4.2) | 12.3 (8.4) | 77.1 (42.3) | 2 |
| S2 | 7 | 5.3 (6.9) | 9.5 (6.3) | 45.7 (29.3) | 1 |
| S3 | 7 | 11.3 (2.4) | 13.9 (4.7) | 85.4 (13.8) | 3 |
| S4 | 7 | 16.8 (3.4) | 15.1 (8.1) | 104.0 (29.4) | 4 |
| S5 | 7 | 25.0 (14.5) | 18.2 (3.1) | 134.3 (33.1) | 5 |