Tex. Water Code § 63.251: LEVY OF TAX.

After bonds have been voted, the commission shall levy a tax on all taxable property in the district sufficient to pay principal of and interest on the bonds and shall annually levy and have assessed and collected on the taxable property of the district an amount sufficient to pay for the expense of assessing and collecting the taxes.

Acts 1971, 62nd Leg., p. 110, ch. 58, Sec. 1, eff. Aug. 30, 1971.