Productivity is one of the most important factors in every organization, including those engaged in the social sector, especially rescue teams or commonly known as disaster social workers. Indonesia as a disaster-prone country assigns disaster social workers under two organizations, namely from the government as National SAR Agency (BASARNAS) and the private sector which oversees the volunteers. Currently, there is a growing concern regarding social workers' productivity. This concern is due to work environment, which has high exposure to high mental workload and traumatic situation. Therefore, it is important to assess the disaster workers' condition in terms of cognitive and work stress factor in order to maintain productivity. Work stress problems are suffered by disaster social workers in Indonesia. The assessment can be used to propose a recommendation for handling risk and preventing mental disorders that can affect performance and productivity. Two main factors which are cognitive is assessed as a variable of empathy with four sub-scales. Work stress factors are assessed as variables of post-traumatic stress responses (PTSR) and general psychological distress (GPD). These three variables are rated using three types of questionnaires and then evaluated. This study aims to determine relationships of cognitive factor and demographic attributes that have a significant effect on work stress factors. Three types of data analyses are performed to support the results of this research. Results show a relationship of cognitive between work stress. Finally, research findings can be used as a reference for improvement for both organizational and individual systems. Recommendations are proposed for disaster social workers to increase productivity by anticipating the risk of work stress.