California Constitution Article XI, Section 14

A local government formed after the effective date of this section, the boundaries of which include all or part of two or more counties, shall not levy a property tax unless such tax has been approved by a majority vote of the qualified voters of that local government voting on the issue of the tax. (Sec. 14 added Nov. 2, 1976, by Prop. 10. Res.Ch. 59, 1976.)