Emergency medical technicians (N = 65) participated in a study on work environment characteristics, work-related stress, and psychological distress. Data were collected at baseline and 6 months. Work-related stress was associated with lower work group support and poor supervisory behavior. Work-related stress was strongly related to psychological distress. Changes in work-related stress were significantly related to changes in psychological distress. Findings support the work-related stress, psychological distress model.