EXHIBIT 31.1

                                 CERTIFICATIONS

I, W. Brent LaGere, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of Chandler (U.S.A.),
     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(s) 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 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(s) 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
     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: May 9, 2006


                                        /s/ W. Brent LaGere
                                        ---------------------------------------
                                        W. Brent LaGere
                                        Chairman of the Board and
                                        Chief Executive Officer

<PAGE>

                                                                  EXHIBIT 31.1
                                                                   (CONTINUED)

                                 CERTIFICATIONS

I, Mark C. Hart, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of Chandler (U.S.A.),
     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(s) 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 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(s) 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
     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: May 9, 2006



                                       /s/ Mark C. Hart
                                        ---------------------------------------
                                        Mark C. Hart
                                        Vice President - Finance,
                                        Chief Financial Officer
                                        and Treasurer