Idaho Code § 39-411.1

For those districts comprised of less than eight (8) counties, the district board of health shall consist of seven (7) members to be appointed by the boards of county commissioners within each district acting jointly, and each board of county commissioners may appoint a board member. For those districts comprised of eight (8) counties, the district board of health shall consist of not less than eight (8) members nor more than nine (9) members and each board of county commissioners may appoint a board member. Each member of the district board of health shall be a citizen of the United States, a resident of the state of Idaho and the public health district for one (1) year immediately last past, and a qualified elector. One (1) member of the district board, if available to serve, shall be a physician licensed by the Idaho state board of medicine and no more than one (1) member shall be appointed from any professional or special interest group. All members shall be chosen with due regard to their knowledge and interest in public health and in promoting the health of the citizens of the state and the public health district. Representation shall be assured from rural as well as urban population groups. All appointments to the district board shall be confirmed by a majority vote of all the county commissioners of all the counties located within the public health district. Any member of the district board may be removed by majority vote of all the county commissioners of all the counties located within the district. The members of the district board, each year, shall select a chairman, a vice-chairman and a trustee. The trustee shall represent the district board as a member of the board of trustees of the Idaho district boards of health. The board of trustees of the Idaho district boards of health shall have authority to allocate appropriations from the legislature to the health districts. The board of trustees shall develop and administer a formula for the allocation of legislative appropriations.