Stone Lion Environmental LLC is a multi-faceted environmental services provider headquartered in Rio Rancho, New Mexico, specializing in environmental science, environmental restoration, and classified material demilitarization. It serves federal clients including the Department of Energy (DOE) and Department of Defense (DOD), providing services such as decontamination and decommissioning, landfill excavation management, hazardous and radioactive waste management, and health and safety oversight. The practice brings a direct-line management approach focused on rapid response and accountable project delivery.