This investigation aims to evaluate the groundwater quality of El-Dakhla oasis, New Valley governorate, Egypt and assess its suitability for irrigation. About 144 groundwater samples were collected from wells distributed in eleven transects that represent the study area. The obtained results indicated that 63 samples were under the C₁S₁ indicating category low sodium and low salinity hazards. Meanwhile, 72 samples in the C₂S₁ category showing low sodium and medium salinity hazards and 9 samples exhibited a C₃S₁ type resulting in low sodium and high salinity hazards.
According to Wilcox diagram, 93.75% of the water samples had an excellent quality for irrigation and 4.86% of them were considered as a permissible class.
The results also revealed that 49.31% of these samples gave positive chloro-alkaline index (CAI) values. However, the remaining samples (50.69%) showed negative CAI.

With respect of the corrosivity ratio(CR), 140 groundwater samples (97.22%) were safe to transport in mineral pipes whereas only 4 samples (2.78%) were corrosive in nature and need non-corrosive pipe to transport and lift these groundwaters.