# **Exhibit 31**

 

**CERTIFICATIONACCOMPANYING PERIODIC REPORT**

**PURSUANT TO SECTION302**

**OF THE SARBANES-OXLEYACT OF 2002**

**(18 U.S.C. 1350)**

 

I, W. Brian Matsuyama, certify that:

 

1.     I have reviewed this quarterlyreport on Form 10-Q of Cascade Natural Gas Corporation;

 

2.     Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this report;

 

3.     Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the registrant as of, and for, the periods presented in thisreport;

 

4.     The registrant’s othercertifying officer(s) and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) for the registrant and have:

 

a.     Designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision, toensure that material information relating to the registrant, including itsconsolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;

 

b.     Evaluated the effectiveness of the registrant’s disclosurecontrols and procedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end of

the period covered by thisreport based on such evaluation; and

 

c.     Disclosed in this report any change in the registrant’s internalcontrol over financial reporting that occurred during the registrant’s mostrecent fiscal quarter (the registrant’s fourth fiscal quarter in the case of anannual report) that has materially affected, or is reasonably likely tomaterially affect, the registrant’s internal control over financial reporting;and

 

5.     The registrant’s other certifyingofficer(s) and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the registrant’s auditors and theaudit committee of the registrant’s board of directors (or persons performingthe equivalent functions):

 

a.     All significant deficiencies and material weaknesses in thedesign or operation of internal control over financial reporting which arereasonably likely to adversely affect the registrant’s ability to record,process,

summarize and reportfinancial information; and

 

b.     Any fraud, whether or not material, that involves management orother employees who have a significant role in the registrant’s internal controlover financial reporting.

 

 
| Date:  | August 12,  2003                       |
|--------|----------------------------------------|
|   |                                   |
| By:    | /s/  W. Brian Matsuyama           |   |
|   | W. Brian  Matsuyama                    |
|   | President  and Chief Executive Officer |
|   | (Principal  Executive Officer)         |

 

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I, J. D. Wessling, certify that:

 

1.     I have reviewed this quarterly reporton Form 10-Q of Cascade Natural Gas Corporation;

 

2.     Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this report;

 

3.     Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the registrant as of, and for, the periods presented in thisreport;

 

4.     The registrant’s other certifyingofficer(s) and I are responsible for establishing and maintaining disclosurecontrols and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the registrant and have:

 

a.     Designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision, toensure that material information relating to the registrant, including itsconsolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;

 

b.     Evaluated the effectiveness of the registrant’s disclosurecontrols and procedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end of

the period covered by thisreport based on such evaluation; and

 

c.     Disclosed in this report any change in the registrant’s internalcontrol over financial reporting that occurred during the registrant’s mostrecent fiscal quarter (the registrant’s fourth fiscal quarter in the case of anannual report) that has materially affected, or is reasonably likely tomaterially affect, the registrant’s internal control over financial reporting;and

 

5.     The registrant’s other certifyingofficer(s) and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the registrant’s auditors and theaudit committee of the registrant’s board of directors (or persons performingthe equivalent functions):

 

a.     All significant deficiencies and material weaknesses in thedesign or operation of internal control over financial reporting which arereasonably likely to adversely affect the registrant’s ability to record,process,

summarize and reportfinancial information; and

 

b.     Any fraud, whether or not material, that involves management orother employees who have a significant role in the registrant’s internalcontrol over financial reporting.

 

 
| Date:  | August 12,  2003                                                  |
|--------|-------------------------------------------------------------------|
|   |                                                              |
| By:    | /s/  J. D. Wessling                                          |   |
|   | J. D.  Wessling                                                   |
|   | Senior Vice  President – Finance and Chief Financial Officer |
|   | (Principal  Financial Officer)                                    |

 

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