UNITED STATES
SECURITIES AND EXCHANGE COMMISSION 
WASHINGTON, D.C. 20549

Form 10-Q



|[X]   |    | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2002.     
|----- | -- | -------------------------------------------------------------------------------------------------------------------------------------------
|      | OR
|[   ] |    | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM _______ TO _______.





|QUESTAR GAS COMPANY                                   
|------------------------------------------------------
|                                                      
|(Exact name of registrant as specified in its charter)





|State of Utah(State or other jurisdiction of
incorporation or organization)                    |  | 87-0155877(IRS Employer Identification Number)
|---------------------------------------------------------------------------------------------- |  | ----------------------------------------------
|                                                                                               |  |                                               
|P.O. Box 45360
180 East 100 South
Salt Lake City, Utah(Address of principal executive offices) |  | 84145-0360(Zip code)                          

(801) 324-5555



|Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Yes   [X] |  | No   [  ]
|--------- |  | ---------



|Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.
|-----------------------------------------------------------------------------------------------------------------------------



|Class                         |  | Outstanding as of April 30, 2003
|----------------------------- |  | --------------------------------
|                              |  |                                 
|Common Stock, $2.50 par value |  | 9,189,626 shares                



|Registrant meets the conditions set forth in General Instruction H(a)(1) and (b) of Form 10-Q and is filing this Form 10-Q with the reduced disclosure format.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------

|                                      
|--------------------------------------
|                                      
|PART 1.  FINANCIAL INFORMATION        
|Item 1.  Financial Statements         
|QUESTAR GAS COMPANY                   
|STATEMENT OF INCOME                   
|(Unaudited)                           
|                                      
|                                      
|                                      
|                                      
|                                      
|                                      
|REVENUES                              
|                                      
|OPERATING EXPENSES                    
|Cost of natural gas sold              
|Operating and maintenance             
|Depreciation                          
|Other taxes                           
|                                      
|                                      
|TOTAL OPERATING EXPENSES              
|                                      
|                                      
|OPERATING INCOME                      
|                                      
|INTEREST AND OTHER INCOME             
|                                      
|DEBT EXPENSE                          
|                                      
|                                      
|INCOME BEFORE INCOME TAXES            
|AND CUMULATIVE EFFECT                 
|                                      
|INCOME TAXES                          
|                                      
|                                      
|                                      
|INCOME BEFORE CUMULATIVE              
|EFFECT                                
|                                      
|Cumulative effect of accounting change
|for asset retirement obligations, net 
|of income taxes of $204               
|                                      
|                                      
|NET INCOME                            
|                                      
|                                      
|                                      
|                                      



| | QUESTAR GAS COMPANY                             
| | ------------------------------------------------
| | CONDENSED BALANCE SHEET                         
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| | ASSETS                                          
| | Current assets                                  
| | Cash and cash equivalents                       
| | Notes receivable from Questar Corp.             
| | Accounts receivable, net                        
| | Inventories, at lower of average cost or market 
| | Gas stored underground                          
| | Materials and supplies                          
| | Prepaid expenses and other                      
| | Deferred income taxes - current                 
| |                                                 
| | Total current assets                            
| |                                                 
| | Property, plant and equipment                   
| | Less accumulated depreciation and amortization  
| |                                                 
| | Net property, plant and equipment               
| |                                                 
| | Regulatory and other assets                     
| | Goodwill                                        
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| | LIABILITIES AND SHAREHOLDER'S EQUITY            
| | Current liabilities                             
| | Checks outstanding in excess of cash balances   
| | Notes payable to Questar Corp.                  
| | Accounts payable and accrued expenses           
| | Purchased-gas adjustments                       
| | Current portion of long-term debt               
| |                                                 
| | Total current liabilities                       
| | Long-term debt, less current portion            
| | Deferred income taxes and investment tax credits
| | Other long-term liabilities                     
| | Common shareholder's equity                     
| | Common stock                                    
| | Additional paid-in capital                      
| | Retained earnings                               
| |                                                 
| | Total common shareholder's equity               
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| | See notes to the financial statements           



| | QUESTAR GAS COMPANY                             
| | ------------------------------------------------
| | CONDENSED STATEMENTS OF CASH FLOWS              
| | (Unaudited)                                     
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| | OPERATING ACTIVITIES                            
| | Net income                                      
| | Depreciation                                    
| | Deferred income taxes and investment tax credits
| | Net (gain) loss from selling assets             
| | Cumulative effect of accounting change          
| |                                                 
| |                                                 
| | Change in operating assets and liabilities      
| |                                                 
| |                                                 
| | NET CASH PROVIDED FROM OPERATING                
| | ACTIVITIES                                      
| |                                                 
| | INVESTING ACTIVITIES                            
| | Purchase of property, plant and equipment       
| | Proceeds from disposition of assets             
| |                                                 
| |                                                 
| | NET CASH USED IN INVESTING                      
| | ACTIVITIES                                      
| |                                                 
| | FINANCING ACTIVITIES                            
| | Checks outstanding in excess of cash balance    
| | Issuance of long-term debt                      
| | Repayment of long-term debt                     
| | Increase in notes receivable from Questar Corp. 
| | Decrease in notes payable to Questar Corp.      
| | Payment of dividends                            
| |                                                 
| |                                                 
| | NET CASH USED IN FINANCIAL ACTIVITIES           
| |                                                 
| |                                                 
| | Change in cash and cash equivalents             
| | Beginning cash and cash equivalents             
| |                                                 
| |                                                 
| | Ending cash and cash equivalents                
| |                                                 
| |                                                 
| |                                                 
| |                                                 
| | See notes to the financial statements           



|QUESTAR GAS COMPANY                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|NOTES TO FINANCIAL STATEMENTS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|March 31, 2003                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|(Unaudited)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Note 1 - Basis of Presentation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|The interim financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented.  All such adjustments are of a normal recurring nature. Due to the seasonal nature of the business, the results of operations for the three- and twelve-month periods ended March 31, 2003, are not necessarily indicative of the results that may be expected for the year ending December 31, 2003.  The impact of abnormal weather on gas distribution earnings is mitigated by the operations of a weather-normalization adjustment.  For further information refer to the financial statements and footnotes thereto included in the Company's annual report on Form 10-K for the year ended December 31, 2002.                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Note 2 - New Accounting Standard                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|On January 1, 2003, Questar Gas adopted Statement of Financial Accounting Standards 143 (SFAS 143) "Accounting for Asset Retirement Obligations."  As a result, the Company recorded a $334,000 after tax charge for the cumulative effect of this accounting change and a $582,000 long-term asset retirement obligation (liability).  SFAS 143 addresses the financial accounting and reporting of the fair value of legal obligations associated with the retirement of tangible long-lived assets.  The new standard requires the Company to estimate a fair value of abandonment costs and to capitalize and depreciate those costs over the life of the related assets.  The provisions of SFAS 143 did not apply to a majority of the Company's long-lived distribution-system assets due to the lack of a legal obligation to abandon the assets or to an indefinite abandonment date.  The new accounting rules allow deferral of an obligation until the abandonment date is known.
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|A regulatory asset amounting to $6.6 million was recorded by Questar Gas reflecting a retroactive charge for the abandonment costs associated with gas wells operated on its behalf by Wexpro.  The regulatory asset will be amortized as the gas wells are plugged and abandoned.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|The asset retirement obligation is adjusted to a present value each period through an accretion process using a credit-adjusted risk-free interest rate.  Both the accretion expense associated with the liability and the depreciation associated with the capitalized abandonment costs are non-cash expenses until the asset is retired.  The ongoing accretion and depreciation expenses associated with SFAS 143 that will directly affect income are insignificant.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Note 3 - Financing                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|On January 24, 2003, Questar Gas issued $40 million of medium-term notes with an effective interest rate of 5.02% and a ten-year life.  The proceeds were used to redeem $41 million of debt with a coupon rate of 8.4%.  A $1.7 million call premium was paid.  This issue completed a Form S-3 shelf registration for issuance of up to $100 million of medium-term notes filed by Questar Gas in the third quarter of 2001.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|On February 27, 2003, Questar Gas filed a shelf registration statement for the issuance of up to $70 million of medium-term notes.  In March 2003, Questar Gas sold $70 million of 15-year notes with a coupon rate of 5.31%.  On April 24, 2003, proceeds from the offering were used to replace $64 million of higher-cost debt issued in 1992 and 1993 with a weighted-average interest rate of 8.11%.  A call premium of $2.6 million was paid.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Note 4 - Reclassifications                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Certain reclassifications were made to the 2002 financial statements to conform with the 2003 presentation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  



|Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
|---------------------------------------------------------------------------------------------
|                                                                                             
|QUESTAR GAS COMPANY                                                                          
|March 31, 2003                                                                               
|(Unaudited)                                                                                  
|Operating Results                                                                            
|Following is a summary of financial and operating information for the Company:               
|                                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|FINANCIAL RESULTS - (In Thousands)                                                           
|Revenues                                                                                     
|From unaffiliated customers                                                                  
|From affiliates                                                                              
|                                                                                             
|Total revenues                                                                               
|Cost of natural gas sold                                                                     
|                                                                                             
|Margin                                                                                       
|                                                                                             
|                                                                                             
|                                                                                             
|Operating income                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|Income before cumulative effect                                                              
|Cumulative effect of accounting change                                                       
|                                                                                             
|Net income                                                                                   
|                                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|OPERATING STATISTICS                                                                         
|Natural gas volumes (in thousands of                                                         
|Decatherms)                                                                                  
|Residential and commercial sales                                                             
|Industrial sales                                                                             
|Transportation for industrial customers                                                      
|                                                                                             
|Total industrial                                                                             
|                                                                                             
|Total deliveries                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|                                                                                             
|Natural gas revenue (per Decatherm)                                                          
|Residential and commercial                                                                   
|Industrial sales                                                                             
|Transportation for industrial customers                                                      
|Heating degree days                                                                          
|colder (warmer) than normal                                                                  
|Average temperature-adjusted usage per                                                       
|Customer (Decatherms)                                                                        
|Number of customers at March 31,                                                             
|Residential and commercial                                                                   
|Industrial                                                                                   
|                                                                                             
|Total                                                                                        
|                                                                                             
|                                                                                             
|                                                                                             



|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Revenues less cost of gas sold (margin)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Questar Gas's margin was 8% higher in the first quarter of 2003 compared with the first quarter of 2002 due to a general rate increase, customer additions and higher usage per customer. Effective December 30, 2002, the Public Service Commission of Utah (PSCU) issued an order approving an $11.2 million general rate increase for Questar Gas using an 11.2% return on equity.  The rate increase also reflects year-end 2002 usage per customer and costs.  The number of customers increased year over year by 18,212 or 2.5%.   Temperature adjusted usage per customer increased 2.4% in the first quarter of 2003 compared with the first quarter of 2002.
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|The margin for the 12 months ended March 31, 2003, was 11% higher when compared with the same period of 2002 due to the factors discussed for the first quarter.  In addition, the 2003 period benefited from the one-time recovery in August 2002 of $3.8 million of gas costs previously denied.  In addition, beginning in 2002, the PSCU authorized Questar Gas to recover the gas-cost portion of bad debt expense in pass-through gas costs. Starting in 2003, contributions in aid of construction were recorded as a reduction in rate base rather than revenue as required by the Utah general rate case.                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|While warmer temperatures in 2003 resulted in a decrease in the gas volumes delivered, the financial effect was mitigated by a weather-normalization adjustment (WNA) in the Company's rates.  The WNA has the same leveling effect when temperatures are colder than normal.  Generally under the WNA, rates are designed to recover non-gas costs based on normal temperatures.                                                                                                                                                                                                                                                                                     
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Gas volumes delivered to industrial customers were 16% lower in the first quarter and 13% in the 12 months ended March 31, 2003, due to a decrease of gas used to generate electricity and in manufacturing processes.                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Operating and maintenance expenses were 7% higher in the 3-month period and 2% higher in the 12-month period ended March 31, 2003, when compared to the same periods in the previous year, primarily due to higher labor-related costs.  Labor-related expenses have increased primarily because of higher costs of pension and other long-term benefit programs and less capitalization of labor costs.  Higher depreciation expense in the 2003 periods reflects increased investment in computer equipment and software, which are depreciated over a shorter life than other assets.                                                                              
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Debt expense was higher in the first quarter comparison due to debt refinancing.  Debt expense was accrued on both the new debt and the debt to be replaced during the 30-day call period.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|The effective income tax rate for the first quarter was 39.9% in 2003 and 39.0% in 2002.  An income tax credit for non-conventional fuel credits expired for gas and oil produced after December 31, 2002.  However, the lost revenue was considered in setting rates in Questar Gas's general rate increase effective December 30, 2002.  The Company realized $.4 million of non-conventional fuel tax credits in the first quarter of 2002.                                                                                                                                                                                                                        
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Cumulative effect of change in accounting method                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|On January 1, 2003, the Company adopted a new accounting rule, SFAS 143, "Accounting for Asset Retirement Obligations" and recorded a cumulative effect that reduced net income by $334,000.  Another $6.6 million, before income taxes, was recorded as a regulatory asset representing the accumulated SFAS 143 costs incurred by Wexpro for gas wells operated on behalf of Questar Gas.  This asset will be amortized as the wells are plugged and abandoned.  The ongoing accretion and depreciation expenses associated with SFAS 143 that will directly affect income are insignificant.                                                                       





|Liquidity and Capital Resources                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Operating Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Net cash provided from operating activities in the first quarter of 2003 was $44.4 million less than was provided during the first quarter of 2002, primarily due to changes in operating assets and liabilities.  The change in the over-collected purchased-gas adjustment account was $24.7 million less in the first quarter of 2003.  In addition, a warmer winter in 2003 led to reduced gas withdrawals from storage of $16 million.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Investing Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Capital expenditures were $9.9 million for the first quarter of 2003 and are estimated to reach $79.5 million for calendar year 2003.  Questar Gas' forecasted capital investment in 2003 includes approximately $20 million to replace an aging Customer Information System.  Questar Gas intends to include these costs in a future general rate case.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Financing Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Net cash provided from operating activities in the first quarter allowed the Company to finance capital expenditures, pay dividends, eliminate short-term debt and loan excess cash to Questar Corp.  Capital expenditures for the remainder of 2003 are expected to be financed from net cash flow provided from operating activities.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Questar Gas issued $110 million of medium-term notes in the first quarter of 2003 and used the proceeds to replace existing medium-term notes that had higher coupon rates.  The $64 million current portion of long-term debt at March 31, 2003 reflects a 30-day call notification period that extended past March 31, 2003.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Forward-Looking Statements                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|This report includes "forward-looking statements" within the meaning of Section 27(A) of the Securities Act of 1933, as amended, and Section 21(E) of the Securities Exchange Act of 1934, as amended.  All statements other than statements of historical facts included or incorporated by reference in this report, including, without limitation, statements regarding the Company's future financial position, business strategy, budgets, projected costs and plans and objectives of management for future operations, are forward-looking statements.  In addition, forward-looking statements generally can be identified by the use of forward-looking terminology such as "may," "will," "could," "expect," "intend," "project," "estimate," "anticipate," "believe," "forecast," or "continue" or the negative thereof or variations thereon or similar terminology.  Although these statements are made in good faith and are reasonable representations of the Company's expected performance at the time, actual results may vary from management's stated expectations and projections due to a variety of factors.
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Important assumptions and other significant factors that could cause actual results to differ materially from those expressed or implied in forward-looking statements include:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Changes in general economic conditions;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Changes in prices and supplies;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Changes in rate-regulatory policies;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Regulation of the Wexpro agreement;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Rate of inflation and interest rates;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Weather and other natural phenomena;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|The effect of environmental regulation;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Changes in customers' credit ratings and their ability to pay for gas consumed;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Competition from other forms of energy;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|The effect of accounting policies issued periodically by accounting standard-setting bodies;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Adverse repercussion from terrorist attacks or acts of war;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Adverse changes in the business or financial condition of the Company; and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Lower credit ratings.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Item 4.  Controls and Procedures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|a. Evaluation of Disclosure Controls and Procedures.  The Company's Chief Executive Officer and Chief Financial Officer have evaluated the effectiveness of the Company's disclosure controls and procedures (as such term is defined in Rules 13a-14(c) and 15d-14(c) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as of a date within 90 days prior to the filing date of this quarterly report (the "Evaluation Date").  Based on such evaluation, such officers have concluded that, as of the Evaluation Date, the Company's disclosure controls and procedures are effective in alerting them on a timely basis to material information relating to the Company, including its consolidated subsidiaries, required to be included in the Company's reports filed or submitted under the Exchange Act.                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|b.  Changes in Internal Controls.  Since the Evaluation Date, there have not been any significant changes in the Company's internal controls or in other factors that could significantly affect such controls.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Part II 
OTHER INFORMATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         



|Item 5.  Other Information.
          D. N. Rose, age 58, resigned as a director of Questar Gas Company ("Questar Gas" or 
the "Company") effective May 1, 2003, concurrently with his retirement as an employee and resignation as the Company's President and Chief Executive Officer.  Mr. Rose had served as a director of Questar Gas since May of 1984 and as its President and Chief Executive Officer since October of 1984.
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|As previously announced, Alan K. Allred, age 52, was appointed to succeed Mr. Rose as the Company's President and Chief Executive Officer.  During his 25 years of service with Questar Gas and its affiliates, Mr. Allred has served in a number of key leadership roles including Manager of Regulatory Affairs (October 1997 to November 2000), Vice President, Business Development (November 2000 to March 2002), Senior Vice President (March 2002 to November 2002,) and Executive Vice President and Chief Operating Officer (November 2002 to May 2003).  He will also be elected to serve as a director of the Company at its annual meeting scheduled for May 20, 2003.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Item 6.  Exhibits and Reports on Form 8-K.
          a.   The following exhibits are being filed as part of this report.
|------------------------------------------------------------------------------------------------------------------------



|Exhibit No. | Exhibit                                      
|----------- | ---------------------------------------------
|            |                                              
|99.1        | Certification of A. K. Allred and S. E. Parks



|b.   Questar Gas did not file any Current Reports on Form 8-K during the quarter.
|---------------------------------------------------------------------------------



|SIGNATURES
|----------



|Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|             |  | QUESTAR GAS COMPANY
   (Registrant)                                
|------------ |  | -------------------------------------------------------------------
|             |  |                                                                    
|May 14, 2003 |  | /s/ A. K. Allred                                                   
|             |  |                                                                    
|             |  | A. K. Allred
President and Chief Executive Officer                 
|             |  |                                                                    
|             |  |                                                                    
|May 14, 2003 |  | /s/S. E. Parks                                                     
|             |  |                                                                    
|             |  | S. E. Parks
Vice President, Treasurer, and 
Chief Financial Officer
|             |  |                                                                    







|CERTIFICATION
|-------------



|I, A. K. Allred, certify that:
|------------------------------



|1. | I have reviewed this quarterly report on Form 10-Q of Questar Gas Company;
|-- | --------------------------------------------------------------------------



|2. | Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. | Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. | The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|a) | designed such disclosure controls and procedures to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|b) | evaluated the effectiveness of the registrant's disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the "Evaluation Date"); and
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|c) | presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | The registrant's other certifying officer and I have disclosed, based on our most recent evaluation, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent function):
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|a) | all significant deficiencies in the design or operation of internal controls that could adversely affect the registrant's ability to record, process, summarize and report financial data and have identified for the registrant's auditors any material weaknesses in internal controls; and
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal controls;
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------





|6. | The registrant's other certifying officer and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|             |  |                     
|------------ |  | --------------------
|May 14, 2003 |  | By:  /s/A. K. Allred
|             |  |                     
|Date         |  |                     
|             |  |                     









|CERTIFICATION
|-------------



|I, S. E. Parks, certify that:
|-----------------------------



|1. | I have reviewed this quarterly report on Form 10-Q of Questar Gas Company;
|-- | --------------------------------------------------------------------------



|2. | Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. | Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. | The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|a) | designed such disclosure controls and procedures to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|b) | evaluated the effectiveness of the registrant's disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the "Evaluation Date"); and
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|c) | presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | The registrant's other certifying officer and I have disclosed, based on our most recent evaluation, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent function):
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|a) | all significant deficiencies in the design or operation of internal controls that could adversely affect the registrant's ability to record, process, summarize and report financial data and have identified for the registrant's auditors any material weaknesses in internal controls; and
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal controls;
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------





|6. | The registrant's other certifying officer and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|             |  |                    
|------------ |  | -------------------
|May 14, 2003 |  | By:  /s/S. E. Parks
|             |  |                    
|Date         |  |                    
|             |  |                    









|List of Exhibits:
|-----------------





|Exhibit No. | Exhibit                                      
|----------- | ---------------------------------------------
|            |                                              
|99.1        | Certification of A. K. Allred and S. E. Parks







|Exhibit 99.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|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 Quarterly Report of Questar Gas Company (the "Company") on Form 10-Q for the period ending March 31, 2003, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), A. K. Allred, President and Chief Executive Officer of the Company, and S. E. Parks, Vice President, Treasurer 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.                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|May 14, 2003                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|May 14, 2003                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         





|                                                                                                                                                                                                                           
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.



|This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of  Section 18 of the Securities Exchange Act of 1934, as amended.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|