Many U.S. prisons are located near sources of pollution that are known to negatively impact human health. Inmates can resultantly develop a range of chronic health issues that can be attributable in part to the environmental risks and hazards external to the prisons. My research examines whether U.S. prisons are disproportionately located in Census Block Groups with above-average environmental risks and hazards. I utilize data from EJSCREEN, the U.S. EPA’s environmental justice screening and mapping tool, to quantitatively measure the environmental indicators ranging from particulate matter to hazardous waste proximity present in Census Block Groups. My research also explores the factors contributing to this possible correlation between prison sites and environmental risks and hazards such as the prison siting process. A further understanding of how the prison system can worsen health risks experienced by inmates is important towards addressing environmental injustices.