"The Department of Emergency Management consists of two divisions. The Division of Emergency Communications (DEC) provides 9-1-1 emergency dispatch services for Police, Fire, and the Emergency Medical System. The Division of Emergency Services (DES) coordinates disaster preparation and response planning in partnership with City agencies, non-profit entities, schools and the private sector. DES also houses the Emergency Medical Services Agency (EMSA), which coordinates all of the components of the City's prehospital care system."
City and County of San Francisco