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 Quarterly  Report of SJW Corp. (the "Company")
on Form 10-Q for the  quarterly  period  ended  March 31, 2006 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)
May 5, 2006