The Commission shall consist of five commissioners from each signatory state, each of whom shall be a resident voter of the state from which he or she is appointed. The commissioners shall be chosen in the manner and for the terms provided by law of the state from which they shall be appointed. For each state there shall be on the Commission a member representing the state health department, a member representing the state water pollution control board (if such exists), and, except where a state in its enabling legislation decides that the best interests of the state will be otherwise served, a member representing municipal interests, a member representing industrial interests, and a member representing an agency acting for fisheries or conservation.