Tex. Water Code § 54.742
The application submitted by an owner of land proposed for inclusion shall set forth that the owner of the new land assumes the payment of all taxes, assessments, and fees levied on the land and assessed by the district after the date the land is included in the district. The application shall also set forth an agreement by the owner of the land proposed for inclusion that the land will be subject to future taxes for bond tax and other assessments and fees levied and assessed by the district and be subject to the same liens and provisions and statutes governing all other lands in the district as though the land had been incorporated originally in the district. The application for inclusion shall be verified and acknowledged in a recordable form as conveyances of real property.
Tex. Water Code § 54.742