Montana Title 75. Environmental Protection § 75-10-726. Citizens suit

(1) Any person may commence a civil action to compel compliance by any liable or potentially liable person under 75-10-715 alleged to be in violation of a rule, notice letter, order, or department-approved remedial action required pursuant to a notice letter or order under this chapter.

(2) At least 60 days before commencing the action, the person shall give notice of intent to sue to all liable or potentially liable persons under 75-10-715 who are contemplated to be defendants in the proposed action.

(3) An action may not be commenced under subsection (1) if the liable or potentially liable person is diligently coming into compliance with the rule, notice letter, order, or department-approved remedial action plan or if the department has commenced and is diligently prosecuting an action to require compliance with the rule, notice letter, order, or department-approved remedial action plan.