Exhibit 5 August 5, 1996 Questar Corporation 180 East First South P. O. Box 45433 Salt Lake City, Utah 84145-0433 Gentlemen: Re: Questar Corporation Dividend Reinvestment and Stock Purchase Plan Registration Statement on Form S-3 I am Vice President, Corporate Secretary, and Senior Corporate Counsel of Questar Corporation, a Utah corporation (the "Company"). In such capacity, I am acting as counsel for the Company in connection with the filing of the above-captioned Registration Statement on Form S-3 relating to 1,000,000 additional shares of the Company's common stock, without par value (the "Common Stock"), for issuance pursuant to the terms of the Company's Dividend Reinvestment and Stock Purchase Plan ("Plan") and of the common stock purchase rights ("Rights") that are attached to and trade with the shares of the Company's Common Stock issued pursuant to the terms of such Plan. I have examined the Restated Articles of Incorporation of the Company as amended; the Bylaws of the Company, as amended; the Registration Statement; the Plan as amended; the resolution adopted by the Company's Board of Directors on February 13, 1996, reserving the shares for issuance pursuant to the terms of the Plan; and such other documents, certificates and corporate or other records as I have deemed necessary or appropriate as a basis for the opinion set forth herein. In my examination, I have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to me as originals, the conformity to the original documents of all documents submitted to me as originals or photostatic copies, and the authenticity of the originals of such latter documents. As to any facts material to the opinion expressed herein which were not independently established or verified, I have relied upon statements and representations of officers and other representatives of the Company and others. I am admitted to the Bar of the State of Utah, and I express no opinion as to the laws of any other jurisdiction except the laws of the United States of America. Based upon the foregoing, I am of the opinion that: (1) the Company is a corporation duly organized and existing under the laws of the State of Utah; (2) the 1,000,000 additional shares of Common Stock, together with the remaining 682,526 shares previously reserved and registered, to be issued pursuant to the terms of the Plan, when paid for and issued, will be validly issued and lawfully outstanding, fully paid and non-assessable shares of the Common Stock. I hereby consent to the filing of this opinion as Exhibit 5 to the Registration Statement on Form S-3 filed with the Securities and Exchange Commission by the Company for the registration of 1,000,000 shares of the Company's Common Stock, together with the Rights, that may be issued pursuant to the terms of the Plan. I further consent to the reference made to me under the heading "Legal Opinion" in the Prospectus forming a part of the Registration Statement. Sincerely, /s/ Connie C. Holbrook