ABSTRACT
This research evaluates the groundwater quality of wells in Nyanya and environs, FCTAbuja, north central Nigeria, using physiochemical parameters, pH, Electrical Conductivity (EC), Temperature, Total Dissolved Solid (TDS), Lead (Pb), Magnesium (Mg), Colour, Turbidity, Zinc (Zn), Iron (Fe) etc. The laboratory analytical results were quality evaluated using local and international prescribed threshold standards such as WHO, NSDQW, SON, NAFDAC. Results obtained from various analytical methods such as Piper, Durov, Gibbs and Water Quality Index reveal the water types, which is majorly Ca-Cl type in site 1, 2, 3, 4 and 6. CaHCO3 type in site 5 and mixed Ca-Mg type in site 7. Hydrogeochemical facies is majorly Ca + Mg + Cl + SO4 in site 1, 2, 3, 4 and 6. The hydrogeochemical facies of site 5 is Ca + Mg + HCO3 whereby site 7 has no dominant hydrogeochemical facies. Major processes controlling water quality of wells in the area is due to chemical weathering of rockforming minerals through the dissolution of host rock. Its unsuitability for consumption is due to high concentration of heavy metals according to weighted arithmetic water quality index of the study area.
