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  September  30,  2005 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)


November 4, 2005