Tex. Spec. Dist. Code § 9045.202
(a) Within the discretion of the board, bonds issued under this subchapter may be additionally secured by a deed of trust or mortgage lien on physical property of the district and franchises, easements, water rights and appropriation permits, leases, contracts, and all rights appurtenant to that property, vesting in the trustee:
(b) A purchaser under a sale under the deed of trust or mortgage lien, if one is given:
Added by Acts 2015, 84th Leg., R.S., Ch. 855 (S.B. 1162), Sec. 1.06, eff. April 1, 2017.