California Code, Government Code - GOV § 53727

(a) Neither this Article, nor Article XIII A of the California Constitution, nor Article 3.5 of Division 1 of Title 5 of the Government Code (commencing with Section 50075) shall be construed to authorize any local government or district to impose any general or special tax which it is not otherwise authorized to impose; provided, however, that any special tax imposed pursuant to Article 3.5 of Division 1 of Title 5 of the Government Code prior to August 1, 1985 shall not be affected by this section.

(b) Any tax imposed by any local government or district on or after August 1, 1985, and prior to the effective date of this Article, shall continue to be imposed only if approved by a majority vote of the voters voting in an election on the issue of imposition, which election shall be held within two years of the effective date of this Article. Any local government or district which fails to seek or obtain such majority approval shall cease to impose such tax on and after November 15, 1988.