The facility has 2.2 million cubic yards of hazardous waste and 415 contaminated facilities and structures. There are 1.5 million cubic meters of solid waste and 88 million gallons of liquid waste at the facility. There are 5 trichloroethylene contaminated plumes underground that contaminate groundwater and surface water on-site.
The Department of Energy's Office of Environmental Management began an environmental cleanup program at the site in 1989. In 2005, the Department of Energy initiated deactivation of the Portsmouth facility. In 2010, a $2.1 billion contract was awarded to Fluor-B&W to conduct decontamination and decommissioning activities at the facility for over 10 years. The project is expected to end in 2024. The environmental cleanup program is continued today by the U.S. and Ohio Environmental Protection Agencies. Since this project is still being enacted many field trips are taken to this site. During these field trips, the kids learn details about this plant and what is being done to it.
The Portsmouth Gaseous Diffusion Plant has many different buildings and facilities on site. These include process buildings, feed, and sampling facilities, a mechanical testing building, an electrical switchyard, a steam plant, and a shipping and receiving facility. The site also has a cafeteria, administrative building, and a hospital once used for the employees of the plant.