California Code, Revenue and Taxation Code - RTC § 2325.1

In the event that the Controller determines that an error has occurred in establishing a property tax rate levied pursuant to any provision of this chapter, he shall immediately notify the local agency of such error and the local agency shall reduce its property tax rate by an appropriate amount for the next succeeding fiscal year. In the event that a local agency fails to make such a reduction in its property tax rate, the Controller shall request the Attorney General to bring an action under Chapter 2 (commencing with Section 1084) of Title 1 of Part 3 of the Code of Civil Procedure to force a reduction in the rate.