(a) The attorney general, at the request of the commission, shall bring a civil action against a person who has violated or is violating this subchapter or a rule adopted or an order or permit issued under this subchapter for:
(1) injunctive relief to restrain the person from the violation;
(2) the assessment and recovery of a civil penalty for a violation; or
(3) both injunctive relief and a civil penalty.
(b) A civil penalty assessed under this section may not exceed $25,000 for each violation.
(c) Each day of a continuing violation may be considered a separate violation for the purpose of penalty assessment.
(d) The maximum penalty assessed for a related series of violations may not exceed $500,000.