Concentrations of As, Cd, Cu, Cr, Ni and Pb in water and leachate around three designated municipal solid waste dumpsites and a control site within Port Harcourt and its environs were examined. The results show that heavy metals concentrations in leachates ranged between 0.001 and 0.55mg/l at the East-West road dumpsite and 0.001 and 0.08mg/l at the Eastern bypass dumpsite. The heavy metal concentrations in water ranged from 0.002 - 0.09mg/l and 0.001 - 0.50mg/l in borehole water. Filtration reduced the concentrations of metals in leachates. The seasonal variations of heavy metals showed no regular pattern and the difference between the dry and wet seasons was not significant. In both leachates and water, only the concentrations of Cr (0.55mg/1) at the (old) East-West road dumpsite exceeded the permissible limit of 0.05mg/1. The wastes do not for now, adversely affect the groundwater as metal concentrations in the river and borehole water were very low. However, pollution through run-off is greater in rivers than in boreholes. There was minimal leaching of metals from the waste dumps.