There are about 3,000 local health departments in the United States

Health departments in the United States. Government departments responsible for health issues and health services in the United States exist at Federal, State and local levels. ... Health departments began to be set up in States in the mid-19th century and there is now one in every State.

The mandated services that a local health department must provide are:
Food, lodging, and institutional sanitation.
Individual on-site water supply.
Sanitary sewage collection, treatment, and disposal.
Communicable disease control.
Vital records registration.