Tex. Local Government Code § 42.045

(a) A political subdivision, one purpose of which is to provide services of a governmental or proprietary nature, may not be created in an industrial district designated under Section 42.044 by a municipality unless the municipality gives its written consent by ordinance or resolution. The municipality shall give or deny consent within 60 days after the date the municipality receives a written request for consent. Failure to give or deny consent in the allotted period constitutes the municipality's consent to the initiation of the creation proceedings.

(b) If the consent is obtained, the creation proceedings must be initiated within six months after the date of the consent and must be finally completed within 18 months after the date of the consent. Failure to comply with either time requirement terminates the consent for the proceedings.