Texas Water Code - WATER § 26.343. Regulated Substances

(1) a substance defined in Section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (42 U.S.C. Section 9601 et seq.), but does not include a substance regulated as a hazardous waste under the federal Solid Waste Disposal Act (42 U.S.C. Section 6921 et seq.);

(2) petroleum, including crude oil or a fraction of it, that is liquid at standard conditions of temperature and pressure;  and

(3) any other substance designated by the commission.