Water Code §36.201

(a) The board may annually levy taxes to pay the bonds issued by the district that are payable in whole or in part by taxes. (b) The board may annually levy taxes to pay the maintenance and operating expenses of the district at a rate not to exceed 50 cents on each $100 of assessed valuation. (c) The board may not levy a tax to pay the maintenance and operating expenses of the district under this section until the tax is approved by a majority of the electors voting at an election in the district held for that purpose. The district may: (1) hold an election for approval of the tax at the same time and in conjunction with an election to authorize bonds, following the procedures applicable to a bond election; or (2) hold a separate election for approval of the tax in accordance with Subsection (d). (d) An order calling a separate election for approval of a tax under this section must be issued at least 15 days before the date of the election, and the election notice must be published at least twice in a newspaper of general circulation in the district. The first publication of the notice must be at least 14 days before the date of the election.