Emergency Response Planning Area (ERPA)
Emergency Response Planning Area (ERPA) : Disaster Management. The 10-mile Emergency Planning Zone (EPZ) is further divided into 51 Emergency Response Planning Areas, each identified by its own number. In an emergency, public safety officials will provide specific information for different ERPAs, so it's important to know the number of the ERPA you live in. To find your ERPA number, go the?Emergency Planning Zone page?and select the county you live in