A combined local board of health is composed of at least five members. The number of combined local board of health members to be selected by each participating county or municipality shall be established by agreement of the participating counties or municipalities. No more than one half of the members of a combined local board of health may be personally licensed or certified in, engaged in, or actively participating in the same business, profession or occupation. The number of members of a combined local board of health belonging to the same political party may not exceed by more than one the number of members belonging to another political party. No member may be selected and appointed by and represent more than one participating county or municipality.

The county commission of each participating county may select and appoint by vote no fewer than one and no more than three persons to serve as the representatives of the county on the combined local board of health. Each member appointed as a county representative to the combined local board of health shall be a resident of the participating county. No more than two persons residing in the same magisterial district may be appointed by a participating county as members and no more than two members may be appointed by a participating county who are personally licensed or certified in, engaged in, or actively participating in the same business, profession or occupation.

The governing body of each participating municipality may select and appoint by vote no fewer than one and no more than three persons to serve as the representatives of the municipality on the combined local board of health. Each member appointed as a municipality's representative to the combined local board of health shall be a resident of the municipality. No more than two members who reside in the same municipal ward may be appointed and no more than two members may be appointed who are personally licensed or certified in, engaged in, or actively participating in the same business, profession or occupation.

Upon the formation of a combined local board of health and during the duration of its existence, there may be no separate county board of health or municipal board of health in any county or any municipality participating in the combined local board of health.