Chemical and water isotope ratios data for grounwaters from Pozzo del Sale area in the Irpinia sector of the Southern Apennines are presented. The water chemistry of the acquifer system may initially be regarded as the result of easy and common, low temperature interaction between meteoric water and Late Messinian evaporit, wich produce Ca-bicarbonate and Na-chloride passing through Ca-sulfate waters. However, a closer inspection reveals a more complicated geochemical setting consisting of:(1) two further Na-sulfate and Ca(Mg)-sulfate waters; (2) the existence of different meteoric recharge areas; (3) the mixing between the different groundwaters and allochthonous fluids from terrestrial mud volcanoes
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