(a) Except as provided for in subsection (b) of this section, the selectboard of a town, the trustees of a village, the prudential committee of a fire or lighting district, or the mayor and board of aldermen of a city, shall constitute a board of sewage system commissioners.

(b) The legislative body of the municipality may vote to constitute a separate board of sewage system commissioners. Such board shall have not less than three nor more than seven members, who shall be legally qualified voters of the municipality. Members shall be appointed, and any vacancy filled, by the legislative body of the municipality. The term of each member shall be four years. Any member may be removed by the legislative body of the municipality for just cause after due notice and hearing. The legislative body may designate the board of sewage system commissioners as the board of sewage disposal commissioners provided for in section 3614 of this title. (Amended 1993, No. 91, § 1.)