Hydrochemical peculiarities and groundwater quality assessment of the Birimian and Tarkwaian aquifer systems in Bosome Freho District and Bekwai Municipality of the Ashanti Region, Ghana

Abstract The Birimian and Tarkwaian aquifer systems are the main sources of water supply for Bosome Freho District Bekwai Municipality inhabitants in Ashanti region Ghana. A hydrogeochemical assessment was carried out to ascertain natural baseline chemistry groundwaters factors influencing groundwater these two areas. multivariate statistical tool consisting principal component analysis (PCA) hierarchical cluster (HCA) together with hydrochemical graphical plots applied on 64 samples. Q–mode HCA results were used explain changes along flow paths where three spatial zones types delineated. first type consists Ca–Mg–HCO 3 freshwater (recharge zone), which transitions into Ca–Na–HCO or Na–Ca–HCO mixed waters (intermediate zone) finally evolves third Na–Ca–Mg–HCO –Cl (discharge zone). study also reveals that process is groundwater–rock interaction from carbonate silicate weathering/dissolution, aided by carbonic acid precipitation releases concentration Na + , Ca 2+ Mg HCO ? significantly. chloro-alkaline indices reveal cation exchange as factor controls area. Inverse geochemical modelling shows dissolution primary minerals such dolomite, plagioclase, halite, gypsum, calcite chlorite path. Anthropogenic activities have little influence chemistry. quality suitable irrigational use drinking consumption. obtained so far will contribute research paucity area serve a guide decision-makers improved resources management.