Riverside County offers an early warning notification service that sends phone messages to residents and businesses that are affected, threatened or might be endangered by an emergency event or disaster.
The system uses phone numbers in the region's 911 database to contact listed and unlisted parties. It is TYY/TDD capable. The system will leave a message if the phone is answered by a machine.
Because the system uses only land-line numbers, it is necessary to register numbers for other types of phones. You may do so on the emergency alert website.