Md. Code, Pub. Util. § 17-102

(a) The Commission consists of: (1) three commissioners from Prince George’s County, appointed by the County Executive subject to the confirmation of the County Council; and (2) three commissioners from Montgomery County, of whom: (i) two are appointed by the County Executive subject to the confirmation of the County Council; and (ii) one is the Director of the Montgomery County Department of Environmental Protection, or the Director’s designee. (b) (1) Each commissioner from Prince George’s County shall be a resident of the sanitary district. (2) (i) Except for the commissioner who also serves as the Director of the Montgomery County Department of Environmental Protection, or is the Director’s designee, each commissioner from Montgomery County shall be a registered voter of Montgomery County. (ii) Each commissioner from Prince George’s County shall be a registered voter of Prince George’s County. (c) (1) Except as provided in subsection (a)(2)(ii) of this section, an individual may not be appointed or continue in office as a commissioner if the individual holds any other position of profit or trust under the Constitution or laws of the State or any political subdivision of the State. (2) Not more than two commissioners from Montgomery County may be of the same political party. (d) (1) This subsection does not apply to the commissioner who also serves as the Director of the Montgomery County Department of Environmental Protection, or the Director’s designee. (2) The term of a commissioner is 4 years and begins on June 1 of the year of appointment. (3) The terms of commissioners are staggered as required by the terms provided for commissioners on July 1, 1982. (4) At the end of a term, a commissioner continues to serve until a successor is appointed and takes the oath of office. (5) A commissioner who is appointed after a term has begun serves only for the rest of the term and until a successor is appointed and takes the oath of office. (e) A vacancy on the Commission does not impair the right of the remaining commissioners to exercise all the powers of the Commission. (f) A member of the Commission who also serves as the Director of the Montgomery County Department of Environmental Protection, or is the Director’s designee: (1) serves as a voting member of the Commission; and (2) may serve as the chair or vice chair of the Commission.