                                                                    Exhibit 32.1



                      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 Annual Report of SJW Corp.  (the "Company") on Form 10-K
for the year ended  December 31, 2003 as filed with the  Securities and Exchange
Commission on the date hereof (the "Report"),  I, W. Richard Roth, President and
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.



/s/ W. Richard Roth
---------------------
W. RICHARD ROTH
President and Chief Executive Officer
(Principal executive officer)
March 12, 2004


