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 Islands Bancorp (the "Company") on Form 10-QSB for the three months ended March 31, 2003 as filed with the Securities and Exchange Commission on or about the date hereof (the "Report"), the undersigned, William B. Gossett, principal executive, financial and accounting officer of the Company, does hereby certify, 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 my knowledge: 1. The Report fully complies with the requirements of section 13(a) 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. /s/ William B. Gossett - ------------------------------------- William B. Gossett President and Chief Executive Officer May 15, 2003 - ------------------- Date