Texas Local Government Code - LOC GOV'T § 43.0681. Authority to Annex

(1) the municipality obtains consent to annex the area through a petition signed by more than 50 percent of the registered voters of the area; and

(2) if the registered voters of the area do not own more than 50 percent of the land in the area, the petition described by Subdivision (1) is signed by more than 50 percent of the owners of land in the area.