One hundred and fifty-five different Spanish mineral water analysis have been assessed in order to study the hydrochemical facies and ground-water patterns of evolution. After identifying which type of aquifer belongs each one of the analyses, these have been classified in six lithological groups. The analysis of this data base indicates the following conclusions: 1) as was to be expected, salinity is related to the solubility of aquifer lithology, but the set of maximum values of total dissolved solid is found in C02-rjch waters, 2) it does not seem to exist chloride-sulphate hydrochemical facies with low bicarbonate concentration, neither sodium-magnesium fades with calcium equivalents lower than 20 % and 3) the pathway of chemical evolution for ground water is not sp simple as the classic series of Chevotarev, or at least, they appear several different patterns in function of the lythological groups; thus, gro.und water in hard rocks changes from calcium-bicarbonate water to sodium-chloride facies, or there are two independent patterns of change in the lythological group formed by. gypsum and salt
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