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 period ended December 31, 2003 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.   ss.1350,   as  adopted  pursuant  to  ss.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.  ss.78m  or
      ss.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 12, 2004

/s/ Dr. 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.  ss.1350  subject to the knowledge  standard  contained
therein, and not for any other purpose.