The Operational Definition of a Functional Local Health Department (Brochure) was developed by the National Association of County and City Health Officials (NACCHO) in 2005 to describe and promote the emerging trend of standards-based public health. Throughout the document, the basic responsibilities that every local public health agency should follow are described, including the core functions and the ten essential public health services that local public health agencies should strive for when working with state public health, communities, and governing bodies, so that public health is standard throughout every jurisdiction.
Operational Definition Brochure from NACCHO [1]
More information on the NACCHO Web site [2]
[3] 
[4]
Links
[1] https://www.training-source.org/sites/default/files/boh/documents/OperationalDefinitionBrochure.pdf
[2] http://www.naccho.org/toolbox
[3] https://prepareiowa.training-source.org/section-i-what-public-health
[4] https://prepareiowa.training-source.org/training/toolkits/local-boards-health-toolkit-2016