Field surveys were undertaken in five (5) government-operated landfills in Lagos. Areas of Badagry with marginal human activities and at a theoretical distance of infinity from waste-streams were also sampled as control. Sampling of the transfer loading station (TLS) areas at Oshodi was done to estimate contributions extraneous to municipal solid wastes (MSW) activities. The geology of the sampled areas is essentially that of the Oligocene to Pleistocene Coastal Plain Sands except for those of Epe and Badagry which are Recent Deposits. landfill related groundwater from some of the boreholes...