EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

This certification is provided pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and accompanies the quarterly report on Form 10-Q (the “Form 10-Q”) for the period ended March 31, 2005 of MPW Industrial Services Group, Inc. (the “Issuer”) as filed with the Securities and Exchange Commission on this date hereof. I, Monte R. Black, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(i)

the Form 10-Q fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)); and

(ii)

the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: May 16, 2005

/s/ Monte R. Black

Monte R. Black

Chairman of the Board of Directors,

Chief Executive Officer and President

MPW INDUSTRIAL SERVICES GROUP INC 10-Q