Exhibit 5 CONNER &WINTERS OKLAHOMA CITY ATTORNEYS & COUNSELORS AT LAW Irwin H. Steinhorn James E. Green, Jr. Conner & Winters, LLP Anne B. Sublett Vicki Bronson* John W. Funk Martin R. Wing J. Ryan Sacra Todd P. Lewis* Jared D. Giddens John W. Ingraham 1700 One Leadership Square Jason S. Taylor P. Joshua Wisley Kiran A. Phansalkar Andrew R. Turner Katy Day Inhofe -------------------- Mitchell D. Blackburn Gentra Abbey Sorem 211 North Robinson Charles E. Scharlau* Mark H. Bennett R. Kevin Redwine Stephan A. Wangsgard Bryan J. Wells Tony W. Haynie Oklahoma City, Julia Forrester-Sellers WASHINGTON, D.C. Laura McCasland Holbrook Bruce W. Freeman Oklahoma 73102 7101 Melinda L. Kirk John E. Gatliff II David R. Cordell 405-272-5711 P. Bradley Bendure G. Daniel Miller* J. Dillon Curran John N. Hove Kathryn J. Kindell -------------------- William M. Lewis C. Raymond Patton, Jr. Fax 405-232-2695 Amy M. Santee Henry Rose* L. Belynn Whatley Paul E. Braden Cara M. Hair Erica L. Summers* - ------------------------ Robert J. Melgaard www.cwlaw.com Alissa A. Hurley Peter B. Bradford P. Scott Hathaway ----------- Heather Holt Bilderback HOUSTON, TEXAS Shelia M. Darling Lawrence A. Hall Debra R. Stockton Timothy T. Trump Shelley L. Carter Pamela H. Stabler* TULSA Mark E. Dreyer Jed W. Isbell Nancy E. Vaughn ------------------------ JACKSON, WYOMING Henry G. Will Gregory D. Renberg William G. von Glahn Joseph J. McCain, Jr. Mark D. Berman Bob F. McCoy Randolph L. Jones, Jr. Lynnwood R. Moore, Jr. Katherine G. Coyle John E. Barry Robert A. Curry Beverly K. Smith James R. Ryan SANTA FE, NEW MEXICO Steven W. McGrath Melodie Freeman-Burney Russell H. Harbaugh, Jr. D. Richard Funk R. Richard Love III David O. Cordell Douglas M. Rather Randolph L. Jones, Jr. Robert D. James J. Ronald Petrikin Stephen R. Ward NORTHWEST ARKANSAS --------------------- Larry B. Lipe Jeffrey R. Schoborg John R. Elrod* Greg S. Scharlau Benjamin C. Conner Terri Dill Chadick 1879-1963 John M. Winters, Jr. 1901-1989 *Not Admitted in Oklahoma
May 5, 2005 Perma-Fix Environmental Services, Inc. 1940 Northwest 67th Place Gainesville, Florida 32606 Re: Perma-Fix Environmental Services, Inc.; Form S-8 Registration Statement; 2004 Stock Option Plan; Our File No. 07034.0001 Gentlemen: We are delivering this opinion to you in connection with the preparation and filing with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the "Act"), of the Registration Statement on Form S-8 (the "Registration Statement") of Perma-Fix Environmental Services, Inc., a Delaware corporation (the "Company"), for the registration of 2,000,000 shares of the Company's Common Stock, $.001 par value (the "Common Stock"), issuable by the Company pursuant to the Company's 2004 Stock Option Plan (the "Plan"). In connection with this opinion, the undersigned has examined and relied upon such corporate records, certificates, other documents and questions of law, as we have considered necessary or appropriate for the purposes of this opinion, including, but not limited to, the following: (a) the Company's Restated Certificate of Incorporation, as amended; (b) the Company's Bylaws; (c) the Plan; and (f) the Registration Statement. Perma-Fix Environmental Services, Inc. May 5, 2005 Page 2 In our examination, we have assumed the genuineness of all signatures, the legal capacity of all persons, the authenticity of all documents submitted as originals, the conformity with the original documents of all documents submitted as certified or photostatic copies, and the authenticity of the originals of such copies. We have further assumed that each recipient of shares of the Company's Common Stock under the Plan is eligible to participate in the Plan and that any shares of the Company's Common Stock to be issued pursuant to the Plan will have been registered in accordance with the Act, absent the application of an exemption from registration, prior to the issuance of such shares. In reliance upon, and based on, such examination and review, we are of the opinion that the 2,000,000 shares of Common Stock issuable pursuant to the Plan will constitute, when issued pursuant to the terms of the Plan, duly authorized, validly issued, fully paid and nonassessable shares of Common Stock of the Company. We hereby consent to the filing of this opinion as Exhibit 5 to the Registration Statement. Very truly yours, CONNER & WINTERS, LLP