Two or more adjacent counties and municipalities of the first class located therein may, by mutual agreement of their governing boards, establish and maintain a full-time district health department. When municipalities of the first class desire to cooperate in the maintenance of a full-time district health department, they shall contribute financially in such amount as may be agreed upon by the governing board of the municipality concerned and the county commissioners for the county in which such municipality is located. Such municipality funds shall be considered as contributing to the county's proportionate share of the total district health department budget.
SDCL 34-3-9