Cal. Gov. Code § 29100.6
On or before December 1 of each year, each county auditor shall file with the Controller in such form as the Controller directs, a statement of the amounts of exempt values granted for the homeowners' property tax exemption under subdivision (k) of Section 3 and Section 25 of Article XIII of the Constitution for the county, each city and school district or portion thereof within the county, each special district or subdivision or zone thereof or portion thereof within the county, for which a tax levy is carried on the county assessment roll. The auditor shall therein compute and show the total amount of ad valorem tax loss to the county and the cities and districts resulting from the exemption and the statement shall claim such amount against the state for payment of reimbursement.
Ca. Gov. Code § 29100.6