Exhibit 99.906CERT



                            SECTION 906 CERTIFICATION


Pursuant to 18 U.S.C. ss. 1350, the undersigned officers of the BlackRock
California Insured Municipal Income Trust (the "Company"), hereby certifies, to
the best of their knowledge, that the Company's Report on Form N-CSR for the
fiscal year ended August 31, 2003 (the "Report") fully complies with the
requirements of Section 13(a) or 15(d), as applicable, of the Securities
Exchange Act of 1934 and that the information contained in the Report fairly
presents, in all material respects, the financial condition and results of
operations of the Company.


Date: October 29, 2003
      ----------------------------



/s/ Robert Kapito
- ----------------------------------
Name:  Robert Kapito
Title: Principal Executive Officer


/s/ Henry Gabbay
- ----------------------------------
Name:  Henry Gabbay
Title: Principal Financial Officer