International Science Community Association International Research Journal of Environmental Sciences 2319-1414 8 2 2019 04 22 Assessment of water quality of the Nyando River (Muhoroni-Kenya) using the water quality index (WQI) method 27 33 EN Adesina Femi P. 1 Department of Biology, Federal University of Technology, Akure, Ondo State, Nigeria Ashamo M. Olufemi 2 Department of Biology, Federal University of Technology, Akure, Ondo State, Nigeria Ahamefule Augustus Kelechi 1 Department of Biotechnology, Federal University of Technology, Owerri (FUTO), Nigeria Ezeji Ethelbert Uchechukwu 2 Department of Biotechnology, Federal University of Technology, Owerri (FUTO), Nigeria Zabiullah Ansari 1 Department of Geology, Aligarh Muslim University, Aligarh, UP, India Sarfaraz Ahmad 2 Department of Geology, Aligarh Muslim University, Aligarh, UP, India George O. Achieng 1 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Victor O. Shikuku 2 Kaimosi Friends University College, P.O. Box 385-50309, Kaimosi, Kenya Dickson M. Andala 3 Multimedia University of Kenya, P.O. Box 15653-00503, Nairobi, Kenya George M. Okowa 4 CSI International Ltd, P.O. Box 47846-00100, Nairobi, Kenya James J. Owuor 5 The Technical University of Kenya, P.O. Box 52428-00200, Nairobi, Kenya > Research Paper 2018 11 2 2019 04 22 The quality of a river water is described by the levels of physico-chemical and microbiological parameters. The aim of the present work was to determine the water quality of NyandoRiver water from four sampling stations (Muhoroni, Homalime, Kipchui and Wasao) in Muhoroni sub-catchment area and calculate the water quality index (WQI). Physicochemical and microbiological parameters were determined in water samples following standard protocols. The findings were compared with the allowable limits as stipulated by the World Health Organization (WHO) and Kenya Standard (KS) for drinking water. The calculated Water Quality Indices (WQI) ranged from 51.88 to 101.13 lying between "poor water quality" and "unsuitable for drinking". It is determined that TVC, Fe and Mn represent the most effective water quality parameters for calculation of WQI in Nyando River. Copyright@ International Science Community Association