Assessment of Spatio-temporal levels of pollution parameters due to dumpsite leachate in Lagos, Southwest Nigeria

This study is on the assessment of  spatio-temporal levels of physico-chemical parameters of groundwater in domesticwells located at points around some selected dumpsite due to dumpsite leachate on groundwater pollution. Three dumpsites: Orile (O); Solous 3 (S 3 ) and Solous 1 (S 1 ). Leachate from the respective dumpsites and water from the 10 select wells within 1 km radius of each dumpsites were sampled and analyzed in the laborator. .Spatial distribution maps of the parameters were generated using Geographic Information System and ArchMap 10.5. Laboratory results  revealed that water in domestic wells were deteriorated due to the percolation of  leachate. Spatial analysis revealed that pollution of groundwater was higher within a distance of 345 m from the dumpsites and decreases as the distance increases from the dumpsites. The leachate concentration of  Cl, SO 4 , COD and BOD 5 from O; TDS, and EC  from S 3 ; Cr and Pb  from S 1 dumpsites respectively were above WHO leachate disposal values. The study showed that O impacted more on  groundwater quality  than S 3 and S 1 . It is recommended that water from these wells should not used without treatment. Keywords: Leachate, dumpsite, groundwater, wells, pollution.