Cal. Rev. & Tax. Code § 2852
The procedure authorized by this chapter may be placed in effect in any county by resolution of the board of supervisors adopted on or before August 1st preceding the lien date of the taxes to which the provisions of this chapter are to apply or, at any time, by resolution of the board of supervisors, specifying the effective date, adopted pursuant to the request of the county assessor, county auditor, and county tax collector; provided, that prior to the adoption of such resolution an abstract list of all unpaid items on the delinquent rolls has been prepared and certified by the county auditor, is in use and will continue to be used by the tax collector.
After adoption of the procedure authorized by this chapter, the tax collector must insert in the abstract list or prepare an abstract list of unpaid items from the secured roll each year in the manner provided in Chapter 4, Part 7, Division 1 of the Revenue and Taxation Code.
Ca. Rev. and Tax. Code § 2852