Spatial Groundwater Quality Assessment by WQI and GIS in Ogbia LGA of Bayelsa State, Nigeria

An integrated approach to investigate the spatial groundwater quality in Ogbia LGA in Bayelsa State using WQI and GIS was made. Results from 10 (ten) physicochemical parameters (pH, conductivity, TDS, sulphate, nitrate, sodium, calcium, chloride, magnesium, hardness, iron) analysed on each of the 50 (fifty) groundwater samples from shallow boreholes across the area was used to compute WQI using WHO 2006 as a standard for potable water. Based on calculated WQI, boreholes were classified into excellent, proper, weak, very poor, unsuitable for drinking. Kriging method was then used to generate a digitised WQI map of Ogbia communities based on WQI classes. The map showed excellent to good water was accessible in some parts of Onuebum, Otuasega, Otuoke, Otuogila, Elebele, Emeyal and Oloibiri, whereas, very poor to unfit water occurred at some parts of Ewol, Opume, Akipli and Otuabagi.