A board of trustees shall be appointed from those residing within the area of the proposed abatement district to govern the abatement district. The trustees appointed shall at the first meeting of each year elect a president, secretary, and treasurer to serve during the ensuing year. The officers of the board shall be bonded to the extent of five hundred dollars ($500) to five thousand dollars ($5,000) each as set by the county commissioners. The members of the board shall be appointed by the county commissioners of the county they are to represent. When two (2) or more counties or portions thereof comprise an abatement district, the selection of trustees will be made by mutual agreement of the county commissioners concerned. A board of trustees may have three (3) or five (5) members, as determined by the county commissioners. Each trustee shall be a resident property owner and a registered voter. Trustees shall be appointed for four (4) years on staggered appointments. To initiate the board, at least one (1) member shall be appointed for two (2) years, one (1) for three (3) years, and one (1) for four (4) years. Subsequent appointments shall be for four (4) years. Trustees shall serve without compensation but will be reimbursed for necessary expenses involved with the performance of their official duties. The county health officer and the county agent shall be ex officio members of the board. Whenever two (2) or more counties or portions thereof are included in the district, the health officer and county agent for each county shall be ex officio members of the board. The directors or heads of the following state departments or their designated representatives shall be considered ex officio members of the board and may be called upon for their advice and assistance in the handling of abatement problems affecting their direct interests: agriculture, fish and game, lands, transportation, water resources, and health and welfare.