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Direct Research Journals
Direct Research Journal of Public Health and Environmental Technology:Vol.3 (6), pp. 73-80, October 2018
ISSN 4372-2603

Water Quality Index as a Tool for the Assessment of the Health of Usuma Reservoir, in FCT Abuja Nigeria
Article Number: DRJA5410738317

Original Research Article

*Echoke Joyce Chinyere, R. W. Nadana and R.T. Idowu

Department of Biological Sciences Faculty of Sciences University of Abuja, FCT, Nigeria.

*Corresponding Author E-mail:

date Received: October 7, 2018     date Accepted: October 30, 2018     date Published: October 31, 2018


This paper assessed the water quality index (WQI) of Usuma reservoir. The samples were collected within an annual hydrological season covering both wet and dry seasons between June 2016 and May 2017. Twelve core water quality parameters which are critical and basic determinants of water conditions were analyzed in 72 water samples. The samples parameters includes: water temperature, pH, dissolved oxygen, electrical conductivity, total dissolved solids, biochemical oxygen demand, nitrate, phosphate, sulphate, total alkalinity content, total hardness and total iron. Pearson correlation coefficients were calculated to assess the extent of relationship between the electrical conductivity, water temperature, TDS and total iron indicating that as pH increases, these parameters decreased in value. ANOVA showed a significant difference (p<0.05) in electrical conductivity, pH, TDS, Total Iron, total alkalinity, total hardness and turbidity in the reservoir. Electrical conductivity (67.3 -150.2 mg/l), pH (6.73 – 8.5), sulphate (0.5 -14 mg/), total dissolved solids (37.75 – 115.5 mg/l), total alkalinity (20 58 mg/l, total hardness (22 80 mg/l) had their maximum values within the WHO range while Biochemical oxygen demand (0.5 – 4.82 mg/l), Dissolved Oxygen (3.89 -12.24 mg/l),Nitrate (0.1 8.35 mg/l), Phosphate (0.11 – 5.28 mg/l), total Iron (0.07- 3.28 mg/l), Turbidity (3.09-69NTU) were out of the WHO range. The WQI for Usuma reservoir was found to be 65.83. This confers the status of ‘average’ on it based on WQI category.

Keywords: Water quality index; reservoir; physico-chemical variables