| Parameterâ–º Location? | Cd (mg/l) | Cr (mg/l) | Mn (mg/l) | Fe (mg/l) | EC (ms/cm) | TDS (mg/l) |
| Kilowelo R | 0.06 | 0.07 | 0.8 | 2.53 | 104.2 | 45.4 |
| Mkuju R | 0.0 | 0.0 | 0.0 | 0.09 | 452.0 | 248.6 |
| Umbalilo R | 0.0 | 0.0 | 0.0 | 0.03 | 394.0 | 216.7 |
| Tanzanian/WHO Std* | 0.05 | 0.05 | 0.5 | 1 | 400 | 200 |