Exhibit 32.1

           CHIEF EXECUTIVE OFFICER CERTIFICATION PURSUANT TO 18 U.S.C.
                SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002

The certification set forth below is hereby made solely for the purpose of
satisfying the requirements of Section 906 of the Sarbanes-Oxley Act of 2002 and
may not be relied upon or used for any other purposes.

In connection with the Annual Report of Waters Corporation (the "Company") on
Form 10-K for the year ended December 31, 2004, as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Douglas A. Berthiaume,
Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that
to my knowledge: (1) the Report fully complies with the requirements of Section
13(a) or 15(d) 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.

A signed original of this written statement required by Section 906 or other
document authenticating, acknowledging or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906 has been provided to the Company and will be retained by
the Company and furnished to the Securities and Exchange Commission or its staff
upon request.



Date: March 15, 2005

                                             By: /s/ Douglas A. Berthiaume
                                             -----------------------------------
                                             Douglas A. Berthiaume
                                             Chief Executive Officer