Tex. Water Code § 26.035
The executive director with the approval of the commission or the executive administrator with the approval of the board, as applicable under this code or other laws, may execute agreements with the United States Environmental Protection Agency or any other federal agency that administers programs providing federal cooperation, assistance, grants, or loans for research, development, investigation, training, planning, studies, programming, and construction related to methods, procedures, and facilities for the collection, treatment, and disposal of waste or other water quality control activities. The commission or board may accept federal funds for these purposes and for other purposes consistent with the objectives of this chapter and may use the funds as prescribed by law or as provided by agreement.
Tex. Water Code § 26.035