(a) The district may issue, without an election, bonds, notes, and other obligations secured by revenue or contract payments from any source other than ad valorem taxes.
(b) The district must hold an election in the manner provided by Chapters 49 and 54, Water Code, to obtain voter approval before the district may impose an ad valorem tax or issue bonds payable from ad valorem taxes.

(c) The district may not issue bonds payable from ad valorem taxes to finance a road project unless the issuance is approved by a vote of a two-thirds majority of the district voters voting at an election held for that purpose.