Physiochemical assessment of leachate in three open dumpsites in Oluku, Uselu and New Benin inBenin City was carried out in this study using standard methods. The pH of leachate sample from Oluku dumpsite was ultra-acidic (3.4) with electrical conductivity of 1650 µS/cm. However pH of leachate samples (7.4 and 8.6) collected from Uselu Market dumpsite and New Benin dumpsite were in the alkaline range with electrical conductivity of 8600 and 9800 µS/cm. The aforementioned approach was employed at distances of 2m and 5m from the mid-sections of these dumpsites and pH of leachate at a distance of 5m from the three were observed to be in the neutral range. The physiochemical analysis indicated the hazards of open waste dumping, as leachate in these dumping sites contains ammonia, calcium carbonate, nitrate, sulphate and other heavy metals which can percolate and contaminate surface water and ground water thereby, causing negative effects on public health safety and the environment.