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The stable isotope of the sulphur atom (34S) and the 18O of the sulphates (S 18O4) give information about the type of the mineralisation of the groundwater existing during the water seepage. The decrease of the concentrations in dissolved SO42− (meq/L) versus the increase of δ 18O (‰ vs. SMOW) of the sulphates (S 18O42−) confirms a partial reduction of the dissolved sulphates in the water. The Under-saturated waters versus the gypsum do not cause the precipitations of the sulphates. The study of δ 34S (‰ CD) vs. Cl− (mg/L) indicates high variations in δ 34S (‰ CD) for weak difference in the Cl− (mg/L) content, this is due to the reduction of the dissolved sulphates. Concerning the Jurassic water in Lebanon, an oxidation of the sulphide can take place.