A full-time county health department may be dissolved by resolution of the board of county commissioners, and a first or second class municipality may withdraw from such department by resolution of its governing body, at any time after one year from the establishment of the department, or merger therewith, as the case may be; provided that no dissolution or withdrawal shall occur during any fiscal year for which a budget has been approved therefor, and in no case until ninety days' prior written notice thereof has been given the county board of health.
SDCL 34-3-8