The study area is located in the northern part of the Tlemcen Mountains. It contains very important underground hydraulic potentialities represented by the very karstified dolomitic formations of the Upper Jurassic and the sandstones of the Upper Miocene and Quaternary. The hydrogeochemical study allowed us to conclude that the water points that are saturated in carbonate formations undergo basic exchanges between calcium and sodium in the clay fraction of the aquifer, which led to the presence of a deficit of Ca2+ compared to either SO42-, or bicarbonates. On the other hand, water points which are undersaturated in carbonate formations have induced either an inverse base exchange between Na+ and Ca2+ or the dissolution of the carbonate formations, which has led to the predominance of Ca2+ or Mg2+ over sulphates or even a deficit of Na+ over chlorides. Analysis by Main Component and by the Ascending Hierarchical Component revealed the existence of a close correlation between the chemical elements (Cl-, SO42-, Na+, Mg2+, NO3-,K+ and SO42-), indicating the presence of pollution by irrigation water. A second correlation is initiated between Ca2+ and HCO3- indicating the dissolution of carbonate formations. Keywords: Tlemcen aquifers, Multi-variate statistical analysis, Hydrogeochemistry, Pollution.

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