An action or other proceeding for injury or threatened injury to property or person in a reciprocating jurisdiction caused by pollution originating or that may originate in this state may be brought in this state.
Mont. Code Ann. § 75-16-103, under Uniform Transboundary Pollution Reciprocal Access Act.
Mont. Code Ann. § 75-16-103
An action or other proceeding for injury or threatened injury to property or person in a reciprocating jurisdiction caused by pollution originating or that may originate in this state may be brought in this state.