Tex. Spec. Dist. Code § 8509.0308
(a) District bonds, including refunding bonds, that are not payable wholly from ad valorem taxes may be additionally secured, at the board's discretion, by a deed of trust or mortgage lien on the district's physical property and all franchises, easements, water rights and appropriation permits, leases, and contracts and all rights appurtenant to the property, vesting in the trustee power to:
(b) A purchaser under a sale under the deed of trust lien, if one is given:
Added by Acts 2019, 86th Leg., R.S., Ch. 468 (H.B. 4172), Sec. 1.03, eff. April 1, 2021.