Ultimate biodegradability of Trichloroethylene used as degreaser (Rigwash and Aquabreak) was investigated in the laboratory using marine, brackish and fresh water systems. Total heterotrophic bacteria count decreases from day 1 to day 20 with the Rigwash contaminated marine sample having the highest count (9.6 x106, 9.3 x105, 6.8 x106, 3.0 x105, 2.1 x105) followed by Aquabreak (6.6 x106, 1.36 x106, 1.10 x106, 2.2 x105, 1.7 x105) and then control (1.47 x105, 7.0 x105, 6.9 x105, 2.0 x105, 1.6 x105). The following dreaser degrading bacterial genera were isolated; Pseudomonas, Bacillus, Micrococcus and Enterobacter, with Pseudomonas occurring most with the frequency of 35.7%, followed by Bacillus with the frequency of 30.7%, Micrococcus 15.4% and Enterobacter 15.4%. The study also revealed that overall degreaser utilizing bacteria value was high with Rigwash having 5.94±0.52 log10 cfu/ml while Aquabreak is 2.77±0.17 log10 cfu/ml. Evaluation of the ultimate biodegradation shows Rigwash to be more biodegradable than Aquabreak. At day 28, the percentage (%) ultimate biodegradation were as follows; Rigwash-brackish water (96.6%)> Aquabreak–brackish water (96.2%)> Aquabreak–marine water (67.5%)> Rigwash–marine water (53.4%)> Rigwash–fresh water (48.3%)> Aquabreak–fresh water (34.6%). Summarily, the study revealed that brackish water degrades Trichloroethylene used as degreaser faster, followed by marine water; then least in fresh water. Concequently, discharge of degreaser contaminated effluent into fresh water environment should be discouraged as it poses great threat to human life.