As an oil field matures, it produces larger quantities of produced water. Appropriate treatment levels and technologies depend on a number of factors such as disposal methods or reutilization aims, environmental impacts, and economics. In this study, a pilot plant of capacity 50 m3· day-1 was utilized to conduct flotation, filtration, and adsorption trials for produced water treatment at a crude oil gathering facility. The plant's flexible design allows for the testing of different combinations of these processes based on the requirements of the water to be treated. The subject water during this study was a complex and changing mixture of brine and oil from different oilfields. Induced gas flotation trials were conducted, with different coagulant (poly-aluminum chloride or PAC) addition rates from 0-820 mg·L-1. Inlet oil-in-water (OIW) concentrations were quite varied during the trials, ranging from 39-279 mg·L-1 (fluorescence analysis method) and 12-340 mg·L-1 (infrared analysis method). Turbidity also varied, ranging from 85-279 FTU. Through flocculation/coagulation and flotation, dispersed oils were removed from the water. PAC addition ranging from 60-185 mg·L-1 resulted in reduction of dispersed oil concentration to below 50 mg·L-1 in treated water. PAC addition ranging from 101-200 mg·L-1 resulted in reduction of dispersed oil concentration below 15 mg·L -1 in treated water. Turbidity was also reduced through flotation, trial average reductions ranging from 57-78%. Filtration further reduced turbidity at rates above 80% through the removal of any suspended solids remaining from flotation. Activated carbon adsorption reduced OIW concentrations of flotation/filtration treated water to 5 mg·L-1 through the removal of dissolved oil remaining in the water. Results confirmed that such adsorption treatment would be more practical for water with lower COD concentration, due to high COD concentrations in water drastically reducing the lifetime of activated carbon.