The model was developed to help users understand the fate and treatability of pollutants in wastewaters discharged to conventional activated sludge Publically Owned Treatment Works (POTWs). It aids the user in evaluating whether pollutants in an influent to a POTW are sorbed onto sludge, are volatilized off into the atmosphere, or are biodegraded. The software also will estimate the amount of the pollutant in each process end point of the model, as well as percent total removal from the wastewater influent stream. The FATE model has the capability to evaluate the treatability of both inorganic and organic pollutants discharged to a POTW. Since inorganic and organic compounds are removed by different physical and chemical processes in a POTW, FATE consists of separate models for organic fate analysis and inorganic fate analysis. The calibration and validation of the FATE model is based on actual plant data from a recent nation-wide survey of domestic POTWs. Plant performance data used in the calibration and validation was obtained from actual measurements of the influents and effluents of the surveyed POTWs. A detailed description of the uses and components of the FATE Model is included with the CERCLA Site Discharges to POTWs Treatability Manual.