If the government of each county and municipality included within the proposed district approves and executes the joint powers agreement or amendment establishing the district or adjusting its boundaries within forty-five days after the public hearing held pursuant to § 46A-10B-5, the drainage basin utility district is established or its boundaries are adjusted. The district's governing body shall file with the secretary of state a true copy of the agreement establishing the district or adjusting its boundaries.
SDCL 46A-10B-7