Tex. Water Code § 54.203

A district is authorized to purchase, construct, acquire, own, operate, maintain, repair, improve, extend, or establish a municipal solid waste collection and disposal system, including recycling, inside and outside the district and make proper charges for it. A district may require use of such services as a condition for receiving other district services. A district may enter into an exclusive contract with a private entity to provide such services to all land and persons within its boundaries.