(a) In districts organized prior to July 1, 1961, where there is only one such municipality, 3 trustees shall be appointed from such municipality, and one trustee shall be appointed from the area within the district outside of such municipality, and one trustee shall be appointed at large. In districts organized on and after July 1, 1961, where there is only one such municipality one trustee shall be appointed from such municipality, and one trustee shall be appointed from each county in the district, except that where the district is wholly contained within a single county, one trustee shall be appointed from that county and one additional trustee shall be appointed from the municipality, and, in any case, 2 trustees shall be appointed at large. A trustee appointed from a county in the district shall be appointed from the area outside any such municipality. If the district is located wholly within the corporate limits of such municipality, 3 of the trustees of the district shall be appointed from such municipality, and 2 trustees shall be appointed at large. In a district wholly contained within a single county of between 60,500 and 70,000 population and having no more than one municipality of 5,000 or more population, regardless of the date of organization, 3 trustees shall be appointed from that municipality, 2 trustees shall be appointed from the district outside that municipality, and 2 trustees shall be appointed at large. No more than 2 appointments by each appointing authority may be from the same political party. In the case of the Saline Valley Conservancy District, in addition to the other trustees as provided in this subsection (a), the mayor of each municipality with a population of 2,000 to 4,999 that purchases water from the District may appoint one member to the Board of Trustees beginning July 1, 2023 for a 5-year term, and the member shall serve until the trustee's successor is appointed and qualified or the municipality no longer purchases water from the District. A vacancy shall be filled by the mayor of the municipality for the remainder of the term.