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The study aimed to understand the quality of groundwater in the Laayoune-Dakhla region, in southern Sahara Morocco. Groundwater samples from 30 wells were collected and analyzed for their physical and chemical properties were collected and carefully studied for their physical and chemical properties (T, pH, EC, NO₃^-, Cl^-, HCO₃^-, SO₄^2-, Ca²⁺, Mg²⁺, K⁺ and Na⁺). Based on the data analyzed, we classified the water and calculated some parameters such as sodium adsorption (SAR), the sodium percentage (%Na), the residual sodium carbonate (RSC) and the Magnesium adsorption (%Mg) for each water sample in order to know the suitability for drinking and irrigation. The results showed high levels of salts for most of the water samples studied, where the EC values ranged from 1290 to 6895 µS/cm. According to the water classification based on TDS, 80% of the samples showed very high mineralization. 96.66% of the samples studied were very hard and unfit for human consumption. Also, estimated parameters such as Na% and SAR were within appropriate levels for irrigation, while EC and Cl^- values for most samples were within limits inappropriate for irrigation. According to the Piper diagram 86.66% of the waters are characterized by a sodium chloride facies and 13.33% sulphated calcium. Principal component analysis (PCA) shows that the mineralization of the waters of Laâyoune-Dakhla is of natural origin.