(a) In addition to other authority specifically granted to the commission under this chapter, the commission may enforce this chapter or any rule, order, or permit of the commission adopted under this chapter in the manner and subject to the conditions provided in Chapters 81 and 85 of this code, including the authority to seek and obtain civil penalties and injunctive relief as provided by those chapters.
(b) If the enforcement authority in Section 81.054, Natural Resources Code, is used to institute a civil action alleging a violation of an NPDES permit issued under this chapter, the attorney general may not oppose intervention by a person who has standing to intervene as provided by Rule 60, Texas Rules of Civil Procedure.