EXHIBIT 32.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Perma-Fix Environmental Services, Inc. ("PESI") on Form 10-K for the year ended December 31, 2006 as filed with the Securities and Exchange Commission on the date hereof (the "Form 10-K"), I Dr. Louis F. Centofanti, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Sections.1350, as adopted pursuant to Sections.906 of the Sarbanes-Oxley Act of 2002, that: (1) The Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C.Sections. 78o or Sections. 78o(d)); and (2) The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company. Dated: March 29, 2007 /s/ Louis F. Centofanti - ----------------------- Dr. Louis F. Centofanti President and Chief Executive Officer This certification is furnished to the Securities and Exchange Commission solely for purpose of 18 U.S.C. Sections. 1350 subject to the knowledge standard contained therein, and not for any other purpose.