Any common sewer district organized and existing under sections 204.250 to 204.270, and any sewer district organized and existing under chapter 249, may be converted to a reorganized common sewer district under the provisions of sections 204.600 to 204.640. In addition, a reorganized common sewer district may be established as provided in sections 204.600 to 204.640. Once established, a reorganized common sewer district shall have all powers and authority of and applicable to a common sewer district organized and existing under sections 204.250 to 204.270 and applicable to a sewer district established under chapter 249 which are not inconsistent or in conflict with sections 204.600 to 204.640, provided that no domestic water services shall be provided within the boundaries of an existing public water supply district or within the certificated area of a water corporation as defined in section 386.020.