Mont. Code Ann. § 7-34-2164

The order of dissolution shall be filed of record, and the dissolution shall be effective for all purposes 6 months after the date of filing said order of dissolution, provided that at or before such time the board of trustees of said district certifies to the board of county commissioners that all debts and obligations of the district have been paid, discharged, or irrevocably settled, together with legal proof thereof. Any assets of the district remaining after all debts and obligations of the district have been paid, discharged, or irrevocably settled shall become the property of the county.