The advisory committee appointed pursuant to Section 13631 shall consist of the following:
(a) Two persons from a statewide organization representing waste water treatment plant operators and supervisors, who shall be employed in a waste water treatment plant as an operator or supervisor.
(b) Two persons from statewide organizations representing municipalities, including counties or private utility waste water treatment plants.
(c) Two persons from statewide organizations representing local sanitation agencies, other than agencies specified in subdivision (b).
(d) One person who is a professional engineer specializing in sanitary engineering.
(e) One person from a university or a state university school or division of engineering.
(f) One person who is a member of an organized labor union which represents waste water treatment plant operators.