Okla. Stat. tit. 19 § 898.2
The board of directors of any county sewer improvement district, or the resident citizens liable to pay a majority of the taxes assessed, as shown by the last preceding tax roll of the county, on real property situated within the boundaries of such county sewer improvement district, may ask of the city council or other governing board of any adjacent city, or the board of trustees of any adjacent town, for a consolidation, setting forth the terms of such consolidation which shall include assumption by the district property of the legal bonded indebtedness of the city or town and the assumption by the city or town of the legal public sewer bonded debt of the district. It shall be lawful for the said city council or other governing board of the city or board of trustees of the town so addressed (after first requesting the board of directors of the county sewer improvement district and it does submit the question of such consolidation and the terms and conditions thereof including assumption of each other's legal bonded debt, to a vote of the qualified voters of the county sewer improvement district affected and a majority thereof having voted in favor of such consolidation) by ordinance to consolidate such adjacent county sewer improvement district upon the terms and conditions so submitted.
Okla. Stat. tit. 19, § 898.2