Assessment of Groundwater Quality in Ilorin, North Central Nigeria
Growth in human population and anthropogenic activities has increased the rate of groundwater pollution in the world. This study assessed the quality of water samples collected from open wells from eight different locations in Ilorin, North Central, Nigeria between December 2014 and June 2015. The physicochemical parameters of water samples were analyzed using standard methods. Total bacterial count and total coliform count were determined by standard plate method and membrane filtration technique respectively. Identification of isolated bacteria was done using Bergey’s Manual of Determinative Bacteriology and confirmed by sequencing the DNA of the isolates. The physicochemical values of the water samples ranged as follows: temperature (28.20±0.440C to 27.50±0.370C), pH (7.22±0.06 and 6.80±0.04), conductivity (577.80±41.28 µS/cm), turbidity (6.31±0.21 to 2.69±0.40NTU), total suspended solids (6.20±2.60 to 47.50±1.70mg/l), total dissolved solids (295.40±37.12 to 208.40±31.19 mg/l), dissolved oxygen (9.81±0.37 to 7.04±0.40mg/l), biochemical oxygen demand (6.25±1.31 to 4.38±0.28mg/l), total hardness (294.20±3.81 to 278.10±7.14mg/l), nitrate concentration (23.80±1.61 to 17.47±3.58mg/l) and sulfate concentration (30.58±2.43 to 25.35±1.16mg/l). The water sources were found to have a total bacterial count and total coliform counts above the recommended national and international guidelines. The contamination of the water sources by E. coli and other pathogenic bacteria implies that they are not fit for human consumption.