Tex. Water Code § 36.1086

Districts located within the same management areas or in adjacent management areas may contract to jointly conduct studies or research, or to construct projects, under terms and conditions that the districts consider beneficial. These joint efforts may include studies of groundwater availability and quality, aquifer modeling, and the interaction of groundwater and surface water; educational programs; the purchase and sharing of equipment; and the implementation of projects to make groundwater available, including aquifer recharge, brush control, weather modification, desalination, regionalization, and treatment or conveyance facilities. The districts may contract under their existing authorizations including those of Chapter 791, Government Code, if their contracting authority is not limited by Sections 791.011(c)(2) and (d)(3) and Section 791.014, Government Code.