Dehydration negatively impacts geriatric hospitalization outcomes. The purpose of this study was to investigate the hydration status of psychogeriatric inpatients and explore possible factors for dehydration. A descriptive, retrospective chart review of patients discharged from a psychogeriatric unit was completed. Clinical and biochemical information was collected at three time points (admission, mid-point, and discharge). Results were consistent with clinical observations that less hydrated patients seem to do worse clinically. It is important to closely monitor hydration status in psychogeriatric inpatients to reduce morbidity. Further studies are needed to develop strategies to prevent dehydration and its complications in this population.