ISSN = 1980-993X – doi:10.4136/1980-993X www.ambi-agua.net E-mail:
[email protected] Tel.: (12) 3625-4212 Hydro-geochemical evaluation of groundwater quality in Akoko North West local government area of Ondo State, Nigeria (http://dx.doi.org/10.4136/ambi-agua.851) Temitope D. T. Oyedotun1; Opeyemi Obatoyinbo2 1Department of Geography and Planning Sciences, Faculty of Social Sciences, Adekunle Ajasin University, P. M. B. 001, Akungba-Akoko, Ondo State, Nigeria. e-mail:
[email protected]; 2Department of Geology, Faculty of Science, Adekunle Ajasin University, P. M. B. 001, Akungba-Akoko, Ondo State, Nigeria. e-mail:
[email protected] ABSTRACT A sudden geometric increase in population of Akoko North West Local Government Area of Ondo State has led to an increase in demand for water and harnessing of subsurface water reserve. A total of twenty six water samples obtained from both boreholes and hand-dug wells were analyzed for their physico-chemical characteristics with the aim of assessing their quality, usability and also to determine the level of their contamination in the local government which is dominated by granite gneisses, charnockites, and augen gneisses as the main rock types. The following physico-chemical properties were analyzed for in the samples collected: electrical conductivity (EC), pH, total alkalinity (TA), total dissolved solids (TDS), total suspended solids (TSS), acid neutralizing capacity (ANC) with major cations (Na+, 2+ 2+ 3- - 3- 2+ 2+ + + Mg , Ca ), anions (PO4 , HCO3 , SO4 ) and several heavy metals