**EXHIBIT31.1**

**CERTIFICATION**

I, Henry J. Boucher, Jr.,President and Chief Executive Officer of IWT Tesoro Corporation, certify that:

1.     I have reviewed this report on Form 10-Qof IWT Tesoro Corporation for the quarter ended March 31, 2006;

2.     Based on my knowledge, this report does notcontain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered 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 certifying officerand I am responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e) andinternal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and15d-15(f)) for the registrant and we have:

a) Designed such disclosure controls and procedures,or caused such disclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to the registrant,including its consolidated subsidiaries, is made known to us by others withinthose entities, particularly during the period in which this report is beingprepared;

b) Paragraph omitted pursuant to SEC Release Nos. 33-8238and 34-47986;

c) Evaluated the effectiveness of the registrant’sdisclosure controls and procedures presented in this report our conclusionsabout the effectiveness of the disclosure controls and procedures, as of theend of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in theregistrant’s internal control over financial reporting that occurred during theregistrant’s most recent fiscal quarter that has materially affected, or isreasonably likely to materially affect, the registrant’s internal control overfinancial reporting; and

5.     The registrant’s other certifying officer(s) andI have disclosed, based on our most recent evaluation of internal control overfinancial reporting, to the registrant’s auditors and the audit committee ofregistrant’s board of directors (or persons performing the equivalentfunction):

a) All significant deficiencies in the design oroperation of internal controls which could adversely affect the registrant’sability to record, process, summarize and report financial data and haveidentified for the registrant’s auditors any material weaknesses in internalcontrols; and

b) Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in the registrant’sinternal controls over financial reporting.

 
| Date: June 15, 2006 |   | By:    |   | /s/ Henry  J. Boucher, Jr.       |   |   |
|--------------------------|--------|--------|--------|---------------------------------------|--------|--------|
|                     |   |   |   | Henry J. Boucher, Jr.,           |   |   |
|                     |   |   |   | President and Chief Executive Officer |   |   |

 

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