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 The undersigned officers of Chester Valley Bancorp Inc. (the "Company") hereby certify that the Company's Quarterly Report on Form 10-Q for the three months ended December 31, 2002 (the "Report") fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that as of the date of this statement, the information contained in the Report fairly presents, in all in material respects, the financial condition and result 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. Date: February 13, 2003 /s/ Donna M. Coughey ----------------------------------- Donna M. Coughey President & Chief Executive Officer Date: February 13, 2003 /s/ Albert S. Randa ----------------------------------- Albert S. Randa Chief Financial Officer & Treasurer