Va. Code § 62.1-67
The Commission shall consist of three members as follows: one legislative member of the Commission on Intergovernmental Cooperation who resides in the Potomac River drainage basin, appointed by the Joint Rules Committee; one nonlegislative citizen member at large who resides in the Potomac River drainage basin, appointed by the Governor; and the executive director of the State Water Control Board. Appointments to fill vacancies shall be made for the respective unexpired terms. One of the members shall be designated by the Governor as chairman. The Governor and the Joint Rules Committee shall appoint alternate members for their appointees to the Commission, who shall reside in the Potomac River drainage basin, and each alternate shall have power to act in the absence of the person for whom he is alternate. The legislative member and executive director of the State Water Control Board shall serve terms coincident with their terms of office and the member appointed by the Governor shall serve a term of four years. The terms of each alternate shall run concurrently with the term of the member for whom he is alternate. All members may be reappointed.
Va. Code § 62.1-67