Exhibit No. 32.

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 report of Questar Gas Company (the Company) on Form 10-Q for the period ended September 30, 2008, as filed with the Securities and Exchange Commission on the date hereof (the Report), Ronald W. Jibson, President and Chief Executive Officer of the Company, and S. E. Parks, Vice President and Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

(1)

The Report fully complies with the requirements of Section 13(a) or Section 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.

QUESTAR GAS COMPANY

November 7, 2008

/s/Ronald W. Jibson

Ronald W. Jibson

President and Chief Executive Officer

November 7, 2008

/s/S. E. Parks

S. E. Parks

Vice President and Chief Financial Officer