CERTIFICATION


I, Warren L. Robinson, certify that:

  1. I have reviewed this quarterly report on Form 10-Q of MDU
     Resources Group, Inc.;

  2. Based on my knowledge, this 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 report;

  3. Based on my knowledge, the financial statements, and other
     financial information included in this 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 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-15(e) and 15d-15(e)) for the registrant and have:

       (a) Designed such disclosure controls and procedures, or
       caused such disclosure controls and procedures to be
       designed under our supervision, 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 report is being prepared;

       (b) Evaluated the effectiveness of the registrant's
       disclosure controls and procedures and presented in this
       report our conclusions about the effectiveness of the
       disclosure controls and procedures, as of the end of the
       period covered by this report based on such evaluation;
       and

       (c) Disclosed in this report any change in the
       registrant's internal control over financial reporting
       that occurred during the registrant's most recent fiscal
       quarter (the registrant's fourth fiscal quarter in the
       case of an annual report) that has materially affected,
       or is reasonably likely to materially affect, the
       registrant's internal control over financial reporting;
       and

  5. The registrant's other certifying officer and I have
     disclosed, based on our most recent evaluation of internal
     control over financial reporting, to the registrant's
     auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent
     functions):

       (a) All significant deficiencies and material weaknesses
       in the design or operation of internal control over
       financial reporting which are reasonably likely to
       adversely affect the registrant's ability to record,
       process, summarize and report financial information; and

       (b) Any fraud, whether or not material, that involves
       management or other employees who have a significant role
       in the registrant's internal control over financial
       reporting.

Date:  November 13, 2003


/s/ Warren L. Robinson
Warren L. Robinson
Executive Vice President,
  Treasurer and Chief Financial Officer