County alerts and phone alerts are two different layers

First, check the emergency-alert settings on your phone. Then use CalAlerts to sign up for county systems. Add the places you care about, such as home, work, or school. You may also be able to add a relative’s neighborhood. Each local program has its own form and coverage, so follow that county’s steps.

Wireless Emergency Alerts are a separate layer. They do not need a signup. They may reach a compatible phone in a targeted area. Delivery still depends on the device, carrier, location, settings, and network conditions. County systems use the phone numbers, email addresses, or locations that their forms accept. Keep those details current.

Any alert channel can miss a person or an update. Use more than one source. Read the newest message from local public safety officials. If you see immediate danger, do not wait for a phone alert. The same is true if you receive an evacuation order another way.