In order to be eligible for state aid, under this title, each municipality shall employ a full-time local commissioner of health or public health director to supervise the provision of public health services for that municipality, subject to the following exceptions:

1. 1. such person may serve as the head of a merged agency or multiple agencies, if the approval of the commissioner is obtained; and
2. 2. such person may serve as the local commissioner of health or public health director of additional counties, when authorized pursuant to section three hundred fifty-one of this chapter.