| Sampling site | Arsenic (mg/L) | Iron (mg/L) | Manganese/(mg/L) | Lead (mg/L) |
| Dunkwa | 0.004 ± 0.00 | 0.358 ± 0.04 | 0.031 ± 0.00 | 0.047 ± 0.02 |
| Praso | 0.003 ± 0.00 | 0.689 ± 0.07 | 0.101 ± 0.05 | 0.231 ± 0.01 |
| Akim | 0.026 ± 0.00 | 0.338 ± 0.01 | 0.049 ± 0.06 | 0.065 ± 0.02 |
| Barekese | 0.002 ± 0.00 | 0.141 ± 0.01 | 0.051 ± 0.01 | 0.033 ± 0.05 |
| Brenase | 0.044 ± 0.01 | 0.229 ± 0.08 | 0.086 ± 0.10 | 0.159 ± 0.08 |
| Adiembra | 0.015 ± 0.00 | 4.835 ± 0.50 | 0.032 ± 0.01 | 0.042 ± 0.04 |
| Deboase | 0.009 ± 0.00 | 0.553 ± 0.42 | 0.048 ± 0.02 | 0.072 ± 0.02 |
| Shama | 0.006 ± 0.00 | 0.398 ± 0.29 | 0.075 ± 0.01 | 0.179 ± 0.24 |
| WHO | 0.01 | 0.3 | 0.5 | 0.01 |