| Water quality parameter | Gambier Limestone aquifer sub-unit | Overall unconfined aquifer (n = 33) | Dilwyn confined aquifer (n = 8) | |||
| Unit 1 (n = 11) | Unit 3 (n = 9) | Unit 4 (n = 4) | Camelback (n = 9) | |||
| Ca (mg∙L−1) | 58.3 ± 11.4 | 64.2 ± 19.8 | 68.5 ± 25.9 | 56.4 ± 12.9 | 61 ± 16.3 | 73.5 ± 7.8 |
| Mg (mg∙L−1) | 28.9 ± 9.4 | 32.6 ± 5.1 | 24.4 ± 16.6 | 24.5 ± 14.4 | 28.1 ± 11.1 | 29.7 ± 2 |
| K (mg∙L−1) | 13.7 ± 7.4 | 13.3 ± 9.6 | 5.9 ± 2.7 | 9 ± 10.3 | 11.4 ± 8.7 | 7.6 ± 1 |
| Na (mg∙L−1) | 73.9 ± 24.9 | 75.3 ± 25.9 | 67.3 ± 19.7 | 59.4 ± 18.7 | 69.5 ± 23 | 111.9 ± 12.7 |
| Cl (mg∙L−1) | 83.9 ± 38.1 | 85 ± 43.5 | 83.3 ± 19.5 | 84.8 ± 29.6 | 84.3 ± 34.1 | 160.5 ± 16 |
| SO4 (mg∙L−1) | 32.6 ± 30.1 | 21.1 ± 11.5 | 20.9 ± 18.3 | 14 ± 5.1 | 23.1 ± 20.7 | 18.9 ± 1.8 |
| HCO3 (mg∙L−1) | 208.9 ± 72 | 256.4 ± 79.6 | 217.8 ± 117.7 | 242.2 ± 89 | 231.3 ± 83.6 | 334.8 ± 62.6 |
| Free CO2 (mg∙L−1) | 17.1 ± 13.5 | 21.9 ± 7.6 | 11.5 ± 8.7 | 17.7 ± 9.8 | 17.8 ± 10.7 | - |
| EC (μS∙cm−1) | 848 ± 243.3 | 899.4 ± 293.6 | 843 ± 310 | 697 ± 221.5 | 820.5 ± 260 | 11650 ± 62.6 |
| pH | 7.4 ± 0.2 | 7.2 ± 0.2 | 7.6 ± 0.2 | 7.4 ± 0.2 | 7.4 ± 0.2 | 7.4 ± 0.1 |