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Assessment of water quality of the Nyando River (Muhoroni-Kenya) using the water quality index (WQI) method

Author Affiliations

  • 1Maseno University, P.O. Box 333 - 40105, Maseno, Kenya
  • 2Kaimosi Friends University College, P.O. Box 385-50309, Kaimosi, Kenya
  • 3Multimedia University of Kenya, P.O. Box 15653-00503, Nairobi, Kenya
  • 4CSI International Ltd, P.O. Box 47846-00100, Nairobi, Kenya
  • 5The Technical University of Kenya, P.O. Box 52428-00200, Nairobi, Kenya

Int. Res. J. Environment Sci., Volume 8, Issue (2), Pages 27-33, April,22 (2019)


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.


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