| Site | Number of samples | Minimum | Maximum | Mean ± std |
| M/kwerekwe | 4 | ND | 0.02 | 0.015 ± 0.007 |
| Magogoni | 4 | 0.009 | 0.02 | 0.015 ± 0.006 |
| Kwamchina | 5 | 0.01 | 0.03 | 0.020 ± 0.010 |
| Mshelishelini | 5 | 0.01 | 0.04 | 0.022 ± 0.013 |
| Fuoni | 7 | 0.02 | 0.04 | 0.029 ± 0.007 |