EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS ---------------------------------- We herby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-11443) of SIS Bancorp, Inc. of our report dated January 22, 1998 appearing on page 76 of this Form 10-K. /s/ Price Waterhouse Price Waterhouse LLP Boston, Massachusetts March 30, 1998