ABSTRACT:The compost withdrawn from a composting toilet still contains pathogens and therefore requires a post-treatment unit to treat the compost prior to reuse. A quantitative microbial risk assessment Monte Carlo was conducted to evaluate the risk of infectious diseases and the length of time for the post-treatment. The accidental ingestion of compost (0.5-0.8 g) in a worst case scenario was evaluated. High temperature was efficient in reducing the risk of pathogens; however, the temperature distribution in the unit is not sufficient to reduce pathogens. Therefore, to efficiently reduce pathogens during the post-treatment, the unit requires an insulator to maintain the temperature.