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 Thomas W. Schneider, President and Chief Executive Officer, and James A. Dowd, Vice President and Chief Financial Officer of Pathfinder Bancorp, Inc. (the "Company"), each certify in his/her capacity as an officer of the Company that he/she has reviewed the Quarterly Report of the Company on Form 10-K for the quarter ended December 31, 2002 and that to the best of his/her knowledge: 1. the report fully complies with the requirements of Sections 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. The purpose of this statement is solely to comply with Title 18, Chapter 63, Section 1350 of the United States Code, as amended by Section 906 of the Sarbanes-Oxley Act of 2002. March 28, 2003 /s/Thomas W. Schneider - -------------------------------------------------------------------------------- Date Thomas W. Schneider President and Chief Executive Officer March 28, 2003 /s/James A. Dowd - -------------------------------------------------------------------------------- Date James A. Dowd Vice President and Chief Financial Officer