California Code, Public Utilities Code - PUC § 142262

The authority, subject to the approval of the voters, may impose the retail transactions and use tax at a maximum rate of one-half of 1 percent under this chapter and Part 1.6 (commencing with Section 7251) of Division 2 of the Revenue and Taxation Code, and may state the maximum tax rate in terms of not to exceed one-half of 1 percent.