Waste Industries Usa 10-K 2006 FY Annual report

EXHIBIT 32.2

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 on Form 10-K of Waste Industries USA, Inc. (the “Company”) for the period ended December 31, 2006 as filed with the Securities and Exchange Commission on or about the date hereof (the “Report”), the undersigned hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of, and for, the periods presented in the Report.

/s/ D. Stephen Grissom

Chief Financial Officer

March 16, 2007