| Year | Mg/Ca | Cl/HCO3 | CEV |
| 2012 | 0.42 | 0.57 | 0.30 |
| 2013 | 0.28 | 0.43 | 0.26 |
| 2014 | 0.33 | 0.34 | 0.10 |
| 2015 | 0.29 | 0.37 | 0.10 |
| Min | 0.28 | 0.34 | 0.10 |
| Max | 0.42 | 0.57 | 0.30 |