Any municipality not exempt from the jurisdiction of a county department of health in accordance with section 14¹. of this act which lies partly within a county which has established or joined in establishing a county department of health and partly within a county which has not established or joined in establishing a county department of health shall be treated as follows: That part of the municipality which lies within the county which has established or joined in establishing a county department of health shall be subject to the jurisdiction of such department. In the remaining part of the municipality, the State Department of Health shall, at its own expense, take over or continue the local administration of health laws.

Whenever all the counties in which such municipality lies have established or joined in establishing county departments of health, each part of the municipality shall be subject to the jurisdiction of the respective county department of health.