Tex. Water Code § 51.706
The owner of the new land to be added shall submit an application setting forth that the owner of the new land assumes the payment of all taxes to be levied on his land by the district after the date the land is added to the district. The application also shall set forth an agreement by the owner of the new land that the land will be subject to future taxes for bond tax and flat rate and all other assessments levied and assessed by the district as though the land had been incorporated originally in the district. The application also shall contain an agreement by the owner of the new land that the land will be subject to the same liens and provisions as all other land in the district and subject to the statutes governing all other land in the district.
Tex. Water Code § 51.706