Perma-Fix Environmental Services Gets Final Dangerous Mixed Waste Permit Renewal For Its Perma-Fix Northwest Mixed Waste Facility In Richland, Washington By Washington Department Of Ecology

Perma-Fix Environmental Services, Inc. (NASDAQ:PESI) (the "Company") today announced that it has received a final Dangerous Mixed Waste Permit Renewal for its Perma-Fix Northwest (PFNW) Mixed Waste Facility (MWF) located in Richland, Washington. The permit, issued by the Washington Department of Ecology (Ecology), became effective January 1, 2026.

The renewed permit updates PFNW's original 1999 permit to reflect the facility's current treatment units, infrastructure, safety systems, and operating practices, and represents a significant milestone for the Company's nuclear services platform. PFNW has continued to operate safely under its prior permit while the renewal process was underway and also maintains separate radioactive material licenses from the Washington Department of Health.

As part of the permitting process, Ecology conducted a 64-day public comment period from January 27, 2025, through March 31, 2025, which included a public meeting and engagement with stakeholders. In addition, a Final Supplemental Environmental Impact Statement (SEIS) was issued on November 19, 2025, incorporating updated information related to waste streams, transportation logistics, and treatment processes not addressed in the original 1998 environmental review.