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The impact of dumpsites on the water quality characteristics of adjacent ground water sources has been well researched and documented in the literature.Decay and corrosion of garbage usually release a lot of pollutants(organic,inorganic and microbial)which can easily percolate down to underground aquifer.Consequently,this research was carried out to assess the impact of nine different dumpsites on the water quality of adjacent wells in Sokoto metropolis.METHODS Water samples were collected in clean plastic containers from nine wells that are very close to dumpsites in the metropolis.The sampling locations were coded.Standard procedures were used in analyzing the physico-chemical parameters.Heavy metal analyses were conducted using a Shimadzu Atomic Absorption Spectrometer(AAS)and the result was posted in milligram of pollutant per litre of water(mg/l).RESULTS.The result showed these ranges(in mg/l)for the followings,BOD 12.50-28.90; DO 3.10-5.90; Cl-11.00-93.00; CO32-0.05-0.20; HCO32-0.40-1.45; NO3-0.01-0.08; PO43-0.17-0.22; SO42-0.60-52.60.The ranges for the heavy metals investigated includes Cr ND-1.830; Cu ND-0.360; Fe 1.323-1.944; Mn 2.114-6.799; Ni 1.693-1.826; Pb1.796-2.047; Zn 1.774-2.341.CONCLUSION.Many of the parameters investigated are well above the WHO maximum permissible limits in drinking water(ie,Pb,whose limit is 0.01mg/l).Thus,there is the need for a strong legislation and control for locating a dumpsite in a particular area.Also,wells should not be dug at will without getting clearance from community health workers.