This study describes the geochemical processes controlling the quality of groundwater in waterlogged parts of Muktsar district of southwest Punjab, India. The order of cations remains the same for pre- and postmonsoon samples, i.e. Na⁺ > Ca²⁺ > Mg²⁺ > K⁺, while anion order changes from SO₄^2- >HCO₃^- ≅ Cl^- > NO₃^- in premonsoon to HCO₃^- >> SO₄^2- > Cl - > NO₃^-      in postmonsoon. Significant number of samples (57%) belongs to Na-Cl type in premonsoon indicating dissolution of evaporates present in unsaturated zone, which in postmonsoon represent mixed Ca-Na-HCO₃ type. Calcite, dolomite and gypsum were found to be major contributors to alkaline earth metals, while silicate weathering and ion exchange contribute alkali metals to groundwater. This study also helps in differentiating the geochemical behaviour of groundwater in waterlogged regions as well as unaffected regions.