Each health district shall establish a fund to be designated as the "district health fund", in which shall be placed all sums received by the district from any source, and out of which shall be expended all sums disbursed by the district. In a district composed of more than one county the county treasurer of the county having the largest population shall be the custodian of the fund, and the county auditor of said county shall keep the record of the receipts and disbursements, and shall draw and the county treasurer shall honor and pay all warrants, which shall be approved before issuance and payment as directed by the board.
Each county which is included in the district shall contribute such sums towards the expense for maintaining and operating the district as shall be agreed upon between it and the local board of health in accordance with guidelines established by the state board of health.