Hydrogeochemical investigations were carried out with an objective to identify the processes affecting the chemistry of groundwater in part of the Middle Benue Trough. Fifty-three groundwater samples were collected from wells, boreholes and springs for chemical analysis. Groundwater types identified from Chadha’s plot are four hydrochemical facies: Na-Cl, Ca-Mg-Cl, Na-HCO3, and Ca-Mg-HCO3. Processes result in the distribution of elements in groundwater are about 90% natural using Gibbs plots. Gibbs diagrams identified rock–water interaction as an important geochemical process in the study area. Evaporation, ion exchange, silicate weathering and dissolution of carbonate minerals were identified as other important hydrogeochemical processes from the Chadha’s plot and Gibbs diagrams which influence the groundwater chemistry of the study area.