The department is authorized, with the consent of the boards of health and the county authorities of the counties involved, to establish health districts composed of one or more counties. To further the purposes of this Code section, county boards of health may contract with each other for the provision of multicounty services and also exercise any additional powers as authorized by paragraph (7) of subsection (a) of Code Section 31-3-4; and in the performance of such contracts a county board of health may utilize its employees in other counties.
OCGA § 31-3-15