eng Science and Education Publishing American Journal of Water Resources 2333-4819 2023-10-13 11 4 142 148 10.12691/ajwr-11-4-3 AJWR20231143 article Agbessi Koffi Sodomon bienvenuesodomon@gmail.com 1 Seyf-Laye Alfa-Sika Mande 1 2 3 4 Lall¨¦bila Tampo 4 4 5 Kossitse Venyo Akpataku 5 5 6 Moudassirou Sedou 6 Kossi Jorge Komlan 6 Department of Chemistry, Faculty of Sciences and Techniques, University of Kara, Togo Groundwater is the most important source of water supply in Tchamba prefecture. Groundwater quality contaminations have emerged in many geographical areas due to natural environmental processes and human intervention in the geosystems. Hydrochemical evolution of groundwater quality in the study area was investigated. The physicochemical parameters such as major ions were determined. Factor analysis was used to identify key parameters that described groundwater quality in the study area. The first two factors were considered: Factor 1 explained 53.43% of the total variance and translates the natural rainwater recharge and water-soil/rock interaction process. The second factor (F2) explained 22.05% of the total variance and expresses the anthropogenic pressure such as domestic sewage, uncontrolled landfill waste, fertilizers, and wastewater. The results showed that silicate mineral dissolution and cation exchange in aquifers play an important role in groundwater chemistry evolution. http://pubs.sciepub.com/ajwr/11/4/3/ajwr-11-4-3.pdf groundwater hydrochemical mineral dissolution factor analysis