CA Gov't Code Section 26400.4

This chapter shall not be operative in any county until the board of supervisors, either at a general or a special election, shall submit to the electors of the county the question as to whether the board of supervisors shall be authorized to adopt the revenue-bond method of financing for the improvements referred to in this chapter. If a majority of the electors voting upon the question vote in favor of the revenue-bond method of financing the said improvements, the board of supervisors may proceed to undertake and finance the improvements as provided for herein. If a majority of the electors voting upon the question vote against the revenue-bond method of financing the said improvements, the board of supervisors shall not again submit the question to the electors until a period of at least six months has elapsed since the date of the last election at which the question was submitted.