The sanitary commission of each single county district consists of the following numbers of sanitary commissioners, each appointed by the governing body of the member county: Allegany County – 7; Dorchester County – 6; Somerset County, except as provided in paragraph (2) of this subsection – 5; Worcester County – 5; and Other counties – 3. In a single county district in Somerset County, if there are more than 5 service areas in the single county district, the sanitary commission consists of: One sanitary commissioner from each service area; and If there is an even number of service areas, one additional sanitary commissioner. In a single county district in Somerset County, the sanitary commission consists of: A sanitary commissioner from each service area who is a resident of that service area; and If there is an even number of service areas, one additional sanitary commissioner who is a resident of the county at large. In other counties, each sanitary commissioner shall be a resident of the county. The term of a sanitary commissioner in a single county district is as follows: In Dorchester County, 6 years expiring on July 1 of the appropriate year. In Allegany County, 6 years expiring on June 1 of the appropriate year. In Somerset County, 6 years expiring, as required by the terms of the sanitary commissioners on July 1, 1982, on June 1 or January 1 of the appropriate year. In any other county, 6 years expiring on January 1 of the appropriate year. The terms of sanitary commissioners in a single county district are staggered as required by the terms provided for sanitary commissioners on July 1, 1989. The terms of the first sanitary commissioners appointed in a single county district created after June 30, 1982 are as follows: For one sanitary commissioner, 2 years expiring on the second January 1 after the single county district is created. For one sanitary commissioner, 4 years expiring on the fourth January 1 after the single county district is created. For one sanitary commissioner, 6 years expiring on the sixth January 1 after the single county district is created. At the end of a term, a sanitary commissioner in a single county district continues to serve until a successor is appointed and qualifies. A sanitary commissioner in a single county district who is appointed after a term has begun serves only for the rest of the term and until a successor is appointed and qualifies. At least 1 month before the term of a sanitary commissioner in a single county district expires, the governing body of the member county shall appoint a successor.