Division is the Incident Command System (ICS) terminology (pdf) for an organizational structure that partitions operation based on geography or topography. Encinitas CERT is divided into seven Divisions, A through G, and per ICS terminology, each is led by a Division Supervisor.

The Divisions are defined by this map. Note that the division boundaries correspond to major streets, with the exception of the boundary between Divisions C and D. Most of that boundary corresponds to a steep bluff that is not passable by most vehicles, creating a natural separation.