Tex. Natural Resources Code § 85.207

The amendment, repeal, or expiration of a rule or order of the commission adopted under the provisions of this chapter that were formerly a part of Chapter 76, General Laws, Acts of the 44th Legislature, Regular Session, 1935, as amended, or the provisions of Title 102, Revised Civil Statutes of Texas, 1925, as amended, including provisions of this code formerly included in that title, shall not have the effect of releasing or discharging from liability, penalty, or forfeiture any person violating the rule or order before the effective date of the amendment, repeal, or expiration. Prosecutions and suits for these violations, liabilities, penalties, and forfeitures shall be instituted and proceeded with in all respects as if the rule or order had not been amended or repealed, or had not expired.