If so provided in the transfer agreement, the area served by the system shall, upon completion of the transfer, be deemed annexed to and become a part of the water-sewer district acquiring the system. The county shall provide notice of the hearing by the county legislative authority on the ordinance executing the transfer agreement under RCW
36.94.330 as follows: (1) By mailed notice to all ratepayers served by the system at least fifteen days prior to the hearing; and (2) by notice in a newspaper of general circulation once at least fifteen days prior to the hearing.
In the event of an annexation under this section resulting from the transfer of a system of sewerage, a system of water, or combined water and sewer systems from a county to a water-sewer district, the water-sewer district shall operate the system or systems under the provisions of Title
57 RCW.