Abstract
Groundwater quality can be affected by human activities such as agriculture and improper sewage disposal facilities currently in use by some homeowners within Odeda local government, Ogun State Nigeria. Sixty groundwatersamples collected from hand-dug wellswere analysed for physicochemical and bacteriological parameters using standard procedures. Results were integrated with multivariate and hydrogeochemical analyses to assess groundwater quality and hydrogeologycal facies within the study area. The range of values for the measured parameters include: pH (5.91 – 7.4), EC (101- 1142 μScm-1), TDS (50 - 581 mg L-1), NO3-(3 - 18 mg L-1), Cl- (25 – 234 mg L-1 ), BOD (0.1 – 17.9) and E. Coli (ND - 45×10cfu mL-1). The piper trilinear plot shows that the dominant hydrochemical facies in the study area is the Ca2+– Cl− type. A correlation analysis and a principal component analysis reflect dissolutions from basal rocks and contamination from biological wastes possibly arising from surrounding septic tanks or municipal waste disposal sites. There is need for a continuous monitoring of groundwater by relevant regulatory authorities to safeguard the human health and environment within the study area.
Highlights
Availability and access to water that is fit for purpose is a daily challenge in developing countries such as Nigeria (USAID, 2018).Out of the various water sources available, ground water remains the largest available source of fresh water
Groundwater quality is threatened by organic and inorganic pollution arising from activities such as agriculture and waste disposal
Of major importance is the presence of organic pollution from the type of sewerage systems employed by the population (Kayode et al, 2018).Improperly built septic tanks currently in use by most homeowners within Odeda local government do not meet specification for sewage management and can serve as a medium for the spread of water borne diseases such as cholera, dysentery, schistosomiasis, lymphatic filariosis, parasitic and viral infections
Summary
Availability and access to water that is fit for purpose is a daily challenge in developing countries such as Nigeria (USAID, 2018).Out of the various water sources available, ground water remains the largest available source of fresh water. Of major importance is the presence of organic pollution from the type of sewerage systems employed by the population (Kayode et al, 2018).Improperly built septic tanks currently in use by most homeowners within Odeda local government do not meet specification for sewage management and can serve as a medium for the spread of water borne diseases such as cholera, dysentery, schistosomiasis, lymphatic filariosis, parasitic and viral infections. A detailed study on groundwater quality in relation to the use of these modified septic tanks units is essential within Odeda local government, Abeokuta. This will assist in determining the potential effects of this recent trend on ground water quality and the possible health risk the consuming population may be exposed to
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