City of Philadelphia – Department of Public Health | 13,907 followers on LinkedIn. Dedicated to serving the public’s health in Philadelphia | Our Mission The mission of the Department of Public Health is to protect the health of all Philadelphians and to promote an environment that allows us to lead healthy lives. We provide services, set policies, and enforce laws that support the dignity of every man, woman and child in Philadelphia. Public Health in Philadelphia The history of public health in Philadelphia reaches back to the city's beginnings.