Group A (facies bicarbonate - calcic)

Only a few samples belong to the facies-calcic type. This consists of waters drawn in correspondence of springs and superficial wells in the internal areas of the island, concerning perched water tables. The low temperature (from 18 to 25°C) (Figure 2) and conductibility values (from 831 to 1789 mS/cm) (Figure 3), when compared to the remaining standardisations are proof of the presence of relatively superficial and fast circuits, with minimum water-rock interaction.


Group B (Bicarbonate-alkaline)

These are bicarbonate-alkaline waters. They are characterised by high temperature values (from 40 to 90°C) and relatively contained conductibility (from 1800 to 6700 mS/cm), when compared to those in groups C and D. These waters were generally sampled in the internal areas of the island, particularly near the marginal faults of Mount Epomeo, at the top and at the foot of the same.