Evaluation Of Physiochemical Properties And Contaminant Index In Selected River Water Around Ewekoro

This research work is aimed at evaluating the concentration of physiochemical parameters and contamination levels in selected rivers in Ewekoro area. Physiochemical parameters were investigated in twelve (12) water samples collected from three different rivers with proximity to the limestone mining and industrial sites in the study area using atomic absorption spectrophotometer. A heavy metal pollution index (HMPI) was computed in determining the contamination levels and concentrations result was compared with both national and international standard. The result shows the presence of concentration of all analysed parameters in all the water samples except nickel and arsenic. The concentrations of copper, zinc, calcium, cadmium, EC, pH, TDS, and DO were within the permissible limit of WHO, FOEN, and NAFDAC. Meanwhile the concentration of Fe, Pb, TH and Alkalinity were above the national and international standard. The calculated HMP index varies from 1.13505 to 6.69082, indicating low metal contamination in the selected rivers. In conclusion, while the overall water quality appears generally acceptable based on the HMPI analysis, the exceedances of specific parameters highlight the need for ongoing vigilance. To ensure long-term water resource safety and sustainability, a multi-faceted approach incorporating regular monitoring, targeted remediation, and source control measures is recommended. Keywords: Heavy metals, Contamination level, Pollution indices, mining, limestone