Each of the sirens throughout the zone will be tested individually for a few seconds. The early warning system sirens were installed and are maintained as one of the requirements related to operating the Diablo Canyon nuclear power plant.
During any major local emergency where there is a need to alert large numbers of people the siren system can be used to make the public aware of actions the may need to take.
The early warning system sirens cover an area extending from Cayucos to the north to the Nipomo Mesa area to the south. This includes the northern Nipomo Mesa, the Five Cities Area, Avila Bay, See Canyon and Squire Canyon areas, Price Canyon area, Baywood Park/Los Osos, San Luis Obispo, Morro Bay and Cayucos.