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Water quality of different locations in River state, Nigeria was evaluated using Water Quality Index (WQI) approach to assess the suitability of water from three local government areas in Rivers State. The study revealed that WQI was determined by the following parameters: pH, Temp, EC, BOD, Chloride, Sulphate, Calcium, Magnesium, Phosphate, Total Hardness, Nitrate, Pb Calcium, Cd, Cu, and Fe. The result obtained indicated that the water quality index of borehole water exceeded the status of water quality in all sampling locations due to groundwater contamination, making the water unsafe for human and animal consumption. Residents within the State should be enlightened on the adverse effect of drinking polluted water and the need for water treatment before consumption.

Water Quality Index for the Assessment of Selected Borehole Water Quality in Rivers State