Open dumpsite system is practiced in Bwari as in most cities in Nigeria. Decomposing wastes, soil samples and aerial samples were taken from the two major dumpsites in Bwari; Bwari Complex Dumpsite and Bwari Area Council Dumpsite (referred to dumpsites 1 and 2 respectively in this article). Sabouraud Dextrose, MacConkey and Nutrient agar plates in triplicates were exposed at a height of 2 M around the environment of the dumpsites. Control aerial samples were taken about 2 Km away from the dumpsites. Decomposing wastes and soil samples were collected from the dumpsites on ten consecutive days from different points of the dumpsites. These samples were cultured and incubated into nutrient agar and. Potato dextrose agar plates respectively using standard methods. The mean total bacterial count of the decomposing wastes and soil samples from the two dumpsites (1 and 2) were 7.4 x 106, 10.1 x 106 cfu/ml respectively and 5.5 x 105, 6.9 x 105 cfu/ml respectively. The mean total fungal count from the decomposing wastes and soil samples from the two dumpsites (1 and 2) were 4.2 x102 cfu/ml, 6.1 x102 cfu/ml respectively and 4.6 x102 cfu/ml, 4.8 x102 cfu/ml respectively. The mean total fungal count isolated from the aerial samples was 0.2 x101 cfuml and 0.3 x101 cfu/ml respectively. No bacterial growth occurred on the aerial