Assessing the Ground Water Quality in Sagamu Town, Ogun State, South West Nigeria

Abstract

An assessment of the groundwater quality of well and bore holes was carried out in Sagamu Town, Ogun State. Sagamu Local Government Area of Ogun State, a semi-urban settlement, southwest Nigeria and falls under the rain forest agro-ecological zone. The study was aimed at examining the various sources of groundwater, the potential pollutants in the groundwater and the quality of the groundwater as it relates to public health. The study identified two sources of groundwater supply namely, boreholes and wells. Groundwater samples (12) were taken from boreholes and wells and subjected to physical, chemical and biological analysis. The results were compared with WHO standards. The results from the laboratory analysis revealed evidences of pollution from both chemical and biological sources. These were evident from high levels of nitrite (4.46 to 7.08 mg/l), lead (0.004 to 0.026 mg/l), copper (0.011 to 0.098 mg/l), nickel (0.009 to 0.042 mg/l) and iron (0.089 to 3.461), and the presence of bacteria, coliforms and fungi. It was further established that the boreholes and wells were more polluted in areas nearer farms and sanitation units than the areas further away from them. Improper sanitation management and improper education for farmers on farming skills could be the major problem for groundwater quality of the study areas. Also, relevant agencies should make continuous effort to control, regulate and educate the people and those using the water on indiscriminate waste disposal from laundry, domestic and agriculture within the study area.