Local Government Code §43.065

(a) Before the publication of the notice of the first hearing required under Section 43.063 , the governing body of the municipality proposing the annexation shall direct its planning department or other appropriate municipal department to prepare a service plan that provides for the extension of full municipal services to the area to be annexed. The municipality shall provide the services by any of the methods by which it extends the services to any other area of the municipality. (b) Sections 43.056 (b)-(o) apply to the annexation of an area to which this subchapter applies.