Glimpse: To evaluate the hydrogeochemical processes and groundwater quality in the Komadugu-Yobe basin, this study used hydrogeochemical analysis, geospatial analysis, and the groundwater quality index. According to the World Health Organization’s drinking water guidelines, certain physicochemical properties of the groundwater samples were found to surpass the maximum permissible limits, as indicated by the hydrochemical results. According to Gibbs diagrams, the main mechanisms affecting the chemistry of groundwater are rock-water interaction and rock weathering processes. Ca2+-Mg2+-HCO-3 is the most common water type found in groundwater, making up 59% of the groundwater samples examined. According to the groundwater quality index (GWQI), 27% and 63 percent of the groundwater samples were classified as good or excellent water types for drinking, respectively.