International Science Community Association International Research Journal of Environmental Sciences 2319-1414 13 1 2024 01 22 Effect of seasonal variability on the physico-chemical quality of surface and groundwater of the Mbe plateau in Pool-north (Republic of Congo) 37 45 EN S.O. Utor 1 LoS Water Engineering Nig Ltd, Suit DO5 J-Pius Plaza, 38 Jimmy Carter Street Asokoro Abuja, Nigeria O.S. Enokela 2 Joseph Sanwuan Tarka University Makurdi, Nigeria J.O. Awulu 3 Joseph Sanwuan Tarka University Makurdi, Nigeria Shrestha Sushila Devi 1 Central Department of Botany, Tribhuvan University, Kirtipur, Kathmandu, Nepal Garkoti Satish Chandra 2 School of Environmental Science, Jawaharlal Nehru University, New Delhi, India Yadav Sudesh 3 School of Environmental Science, Jawaharlal Nehru University, New Delhi, India Verma Anju 4 School of Environmental Science, Jawaharlal Nehru University, New Delhi, India Rajput Mukesh Kumar 5 School of Environmental Science, Jawaharlal Nehru University, New Delhi, India Babu Umesh 6 School of Environmental Science, Jawaharlal Nehru University, New Delhi, India I.C. Davies 1 Department of Fisheries, Faculty of Agriculture, University of Port Harcourt, P.M.B. 5323, Port Harcourt, Nigeria. D.K. Nkeeh 2 Department of Environmental Technology and Management, World Bank Africa Centre of Excellence, Centre for Oil Field Chemicals Research, University of Port Harcourt, P.M.B. 5323, Rivers State, Nigeria O. Efekemo 3 Department of Chemical Sciences, Biochemistry Option, Faculty of Science, Edwin Clark University, Kiagbodo, Delta State, Nigeria Kumar Brinder 1 School of Bioscience, RIMT University, Mandi Gobindgarh, Punjab, India Saroa Ruchika 2 Department of Zoology, GGM Science College Jammu, J&K, India Kotwal Sanjay 3 Zoology Department, Govt. Degree College Paloura, Jammu, J&K, India Obami-Ondon Harmel 1 Mechanical, Energy and Engineering Laboratory, Ecole Nationale Supérieure Polytechnique (Marien Ngouabi University), BP 69 - Brazzaville, Republic of Congo Tchoumou Martin 2 Department of Chemistry, Faculty of Science and Technology (Marien Ngouabi University), BP 69 - Brazzaville, Republic of Congo Adolphe Kempena 3 Department of Geology, Faculty of Science and Technology (Marien Ngouabi University), BP 69 - Brazzaville, Republic of Congo Tathy Christian 4 Mechanical, Energy and Engineering Laboratory, Ecole Nationale Supérieure Polytechnique (Marien Ngouabi University), BP 69 - Brazzaville, Republic of Congo Mabiala Bernard 5 Mechanical, Energy and Engineering Laboratory, Ecole Nationale Supérieure Polytechnique (Marien Ngouabi University), BP 69 - Brazzaville, Republic of Congo > Research Paper 2023 11 30 2024 01 22 Water is a vital resource for humanity. The quality of this resource is essential for the preservation of ecosystems and human health. This study examines the effect of seasonal variability on the physicochemical quality of surface and groundwater in the Mbe Plateau region of Pool-Nord in the Republic of Congo. One hundred and twenty (120) water samples from eight different water sources, including one well, four boreholes and three rivers, between November 2017 and August 2018 were studied. Laboratory analyzes of these samples make it possible to characterize the physicochemical elements of the water. These results are processed using a hydrochemical method, using the diagrams of: Piper, Schoeller Berkaloff, Stiff, and Wilcox. The results show that the values obtained after the analysis of the water samples do not present any significant variation and all comply with the WHO standards for drinking water, except for the temperature which is slightly higher than normal, with values between 24.1 and 27.1°C. The electrical conductivity values range from 5.14 to 16.3 μS/cm and do not show significant seasonal variation. The pH of the waters varies from 4.02 to 6.4, indicating an acidity that does not follow seasonal variation, confirming the acidic nature of the water in the study region. The values of the other physicochemical parameters of the water do not vary significantly depending on the seasons. The waters of the region belong to the calcic chloride facies. The dry season revealed the presence of a second calcic bicarbonate facies. The waters are weakly mineralized and belong to the excellent group on the Wilcox diagram, indicating their drinkability. Copyright@ International Science Community Association