(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 same manner and subject to the same conditions provided by Chapters 81 and 85 of this code, including the authority to seek and obtain civil penalties and injunctive relief under 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 or the failure to obtain 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.