An incinerator discharges effluents into the environment in three states: solid, liquid, and gaseous. The sources of these effluents are the processes of combustion, gas cleaning, and residue quenching. Any determination of the pollution contribution to the environment by incineration must be concerned with all these effluents. The Bureau of Solid Waste Management has initiated a program to characterize the performance of incinerators of different designs and configurations. The primary objectives of this program are to produce basic information that identifies the results of the incineration process and to develop reliable sampling methodology. The Weber County Incinerator at Ogden, Utah is designed to handle 300 tons per 24 hour day of solid waste with a gross heating value of 5000 Btu per pound. During the period of this study the furnaces burned an average of 5.7 tons of solid waste per hour per furnace or 91 percent of the design rate.