53 Pa. Stat. § 68002
A board of health appointed under this article shall be composed of five members, at least one of whom shall be a licensed physician with not less than two years' experience in the practice of his profession. The members of the board of health shall be appointed by the board of supervisors. Upon the creation of a board of health, one member shall be appointed to serve for one year, one for two years, one for three years, one for four years and one for five years, and after that one member shall be appointed each year to serve for five years. Upon the creation of a board of health in a township which has an existing sanitary board, the board of supervisors may continue the incumbent members of the sanitary board as members of the board of health. The members of the board of health shall serve without compensation but shall be reimbursed for actual and necessary expenses incurred in the performance of their duties.
53 P.S. § 68002