California Code, Revenue and Taxation Code - RTC § 7284.9

(a) It is the intent of the Legislature to regulate the imposition and collection of taxes and other charges on groceries comprehensively and to occupy the field to the exclusion of local action except as specifically provided in this chapter.

(b) That the promotion of uniformity in the taxation of groceries is a matter of statewide concern and, therefore, is not a municipal affair as that term is used in Section 5 of Article XI of the California Constitution.