A county board of health is composed of five members selected and appointed by vote of the county commission. Each member appointed to the county board of health shall be a resident of the county. No more than two members who reside in the same magisterial district 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. No more than three members of a county board of health may belong to the same political party.