Physicochemical and Geo-electrical Evaluation of Groundwater Quality in Ojo Community, Lagos State, Nigeria

Authors: Majolagbe, A.O., Adegbola, R.B. And Whetode, J.M.

DOI Info: http://doi.org/10.5281/zenodo.8093967

ABSTRACT

The growth and development of a community are influenced importantly by the quality of water supply aside from the quantity needed for drinking, irrigation, industries, and recreation. Thus, the quality of the main source of water in Ojo community, Lagos State, Nigeria was established through physicochemical assessment, the use of a water quality index, and geoelectrical techniques. Water samples were collected from fifteen (15) different water sample points for chemical analyses and twenty (20) vertical electrical sounding (VES) points using Schlumberger electrode arrangement for possible groundwater potentials. Water quality index (WQI), exceedance, sodium adsorption ratio, and Na/Cl, Ca/Cl ratio were used to further analyze the water data. Only about 93% of the water samples investigated are suitable for irrigation for health reasons. WQI reveals the status of water investigated as excellent (6.7%), and good (20 %), poor (60%) and very poor (13.3 %). The geo-electric results show all 20 VES points to have low resistivity values which is an indication of them being fully, or partially contaminated. In contrast, VES 9 and 10 have high to moderate resistivity values, which diagnoses them as not being contaminated. Continuous monitoring needs to be done to protect the health and sustainability of the environment in line with sustainable development goals (SDG).

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