Texas Education Code - EDUC § 13.103. Initiation of Detachment

(1) give the metes and bounds of the proposed new district;

(2) be signed by at least 10 percent of the registered voters residing in the proposed area to be detached from an existing district;  and

(3) be addressed to the commissioners court of the county in which the territory of the proposed district is located or, if the territory is in more than one county, to the commissioners court of each county in which the territory is located.