Tex. Spec. Dist. Code § 3001.117
(a) The district may:
(1) enter into an agreement with any person for any district purpose, including an agreement:
(b) The district, county, and any other political subdivision, without further authorization, may contract to implement a project or assist the district in providing a service authorized by this chapter. A contract under this subsection may provide:
Acts 2003, 78th Leg., ch. 1277, Sec. 1, eff. April 1, 2005.