| Perceived quality | Misungwi | Magu | Lamadi | All | Chi-square value |
| Clean | 89 (52.7) | 73 (60.3) | 76 (59.8) | 238 (57.1) | χ2 = 56.631 df = 10 p = 0.000 |
| Has sand in it | 7 (4.1) | 5 (4.1) | 5 (3.9) | 17 (4.1) | |
| Has small particles | 26 (15.4) | 39 (32.2) | 40 (31.5) | 105 (25.2) | |
| Has some taste | 16 (9.5) | 3 (2.5) | 4 (3.1) | 23 (5.5) | |
| Has odour | 7 (4.1) | 1 (0.8) | 0 (0.0) | 8 (1.9) | |
| Others | 24 (14.2) | 0 (0.0) | 2 (1.6) | 26 (6.2) |