This paper aims to develop the theoretical framework and the applicative implementation of a new analysis method, which has the purpose of determining and classifying mineral waters in Romania and Europe, with the use of mathematical modelling and fuzzy logic. Firstly, the article underlines the properties of mineral waters in terms of curative effects, particularly the role of Ca2+ and Mg2+ upon the human metabolism. The values of these two chemical elements will constitute an index, a basis for creating a comparative database, which will embed a limited number of samples, with statistical value; in brief, a mathematical model that determines the mineral water spring (or springs) has been implemented, which in the same time illustrates graphically the membership degree of an unknown water sample to a specific spring, making use only of the Ca2+ and Mg2+ concentration indexes.