Okla. Stat. tit. 16 § 16.1
Within thirty (30) days after the effective date of this act or after the formation of a new special improvement, protection, or conservancy district, the clerks and secretaries of all such districts shall record in the office of the county clerk of the county in which any part of the district is located a certified copy of the ordinance, resolution, or order of the court creating the district, and a plat of all parcels or tracts of land included in said district. If thereafter the boundaries of the district are enlarged or diminished by the creating authority, the clerk shall record a certified copy of the ordinance, resolution, or order of the court so enacted in the office of the county clerk within thirty (30) days after said enactment. The county clerk shall record the plat of the special district at such fees as provided by law for recording plats, and indicate the land affected on the numerical index. Liens for assessments levied thereafter by any such district shall not attach to the lands within the district until such ordinance, resolution, or order of the court is recorded. Provided that nothing herein shall be construed as affecting any liens or assessments existing prior to the effective date of this act.
Okla. Stat. tit. 16, § 16.1