Tex. Water Code § 54.745
If the board finds that all the conditions provided for the exclusion of land and inclusion of other land in the district exist and that it is in the best interest of the district to grant such applications, it may adopt and enter in its minutes a resolution and order excluding all or part of the land proposed for exclusion and including all or part of the land proposed for inclusion. Prior to the effective date of the exclusion and inclusion of lands, the district shall have received payment of all fees, charges, assessments, taxes, together with any associated penalties and interest due or overdue in respect to the lands excluded, and if no ad valorem taxes or fees have yet been established by the district for the current year, an amount determined by the district to equal the estimated ad valorem taxes and standby fees to be established by the district for the current year, prorated to the date of exclusion with respect to such excluded lands, shall also be paid.
Tex. Water Code § 54.745