How to Sign Up for San Diego County Emergency Alerts - and Why Your Address Matters
How do I sign up for emergency alerts in San Diego County?
San Diego County residents can register for emergency alerts through AlertSanDiego, the county's official notification platform. Sign up at readysandiego.org, where you'll enter your address and preferred contact methods - phone, cell, or email. Registration is free, and you can add multiple addresses to one account to monitor a home, workplace, or family member's location.
Will I get emergency alerts on my cell phone automatically without signing up?
Cell phones in an affected area automatically receive Wireless Emergency Alerts through FEMA's national system, which requires no registration. However, those alerts target wherever your phone is located, not your home address. Registering with AlertSanDiego links your contact information to a specific address, so you'll receive alerts for your neighborhood even if you're not physically there.
What is the difference between an Evacuation Warning and an Evacuation Order in San Diego County?
In San Diego County, an Evacuation Warning means a potential threat exists and residents should prepare to leave immediately - gather medications, documents, pets, and emergency supplies. An Evacuation Order means leave the area now; re-entry is restricted. AlertSanDiego notifications specify which level applies and typically identify the affected area by street name or zone boundary.
Does SDG&E notify customers about power shutoffs separately from AlertSanDiego?
Yes. San Diego Gas and Electric operates its own notification system for Public Safety Power Shutoffs, which are planned outages during high fire-risk weather. That registration is separate from AlertSanDiego and is managed directly through SDG&E at sdge.com. Residents in fire-prone parts of San Diego County are encouraged to sign up for both systems.
What if I moved or changed my phone number - do I need to update my AlertSanDiego registration?
Yes. AlertSanDiego does not automatically update when you move or change contact information. If your address or phone number has changed since you first registered, log back into your account at readysandiego.org and update your information. Outdated registrations are a common reason residents miss alerts that were sent for their specific area.
San Diego County has one of the more complex emergency-alert systems in California, partly because the county spans everything from coastal neighborhoods to back-country fire corridors, and not every alert reaches every resident the same way. Knowing how the system actually works - and what you need to do to make sure you're in it - can make a real difference when a fire or flood moves fast.
Related: How to Sign Up for Wildfire Evacuation Alerts in California - and Why Your County System Matters More Than You Think · How to Sign Up for Los Angeles County Emergency Alerts Before the Next Disaster
How the County's Alert System Is Set Up
San Diego County uses a platform called AlertSanDiego for its emergency notifications. The system is managed through the county's Office of Emergency Services and uses a combination of phone-based geographic targeting and voluntary registration to reach residents. Cell phones in an affected area can receive Wireless Emergency Alerts automatically through FEMA's national system - those are the loud, intrusive alerts your phone makes without any opt-in. But AlertSanDiego goes further than that baseline. It can send calls, texts, and emails to people who've registered, and it can reach landlines tied to addresses in affected zones without any registration at all. The gap it's filling is for people who rely on cell phones as their only contact and who may not be physically present at a registered address when an emergency hits.
Why You Should Still Register Manually
The national Wireless Emergency Alert system delivers to wherever your phone is pinging a cell tower, which sounds ideal but has real limitations. It doesn't know your home address, so it can't tell you about a mandatory evacuation order for your specific neighborhood if you happen to be across town when it issues. AlertSanDiego registration ties your contact information to a specific address - your home, a family member's house, a school, wherever you want to monitor. You can register multiple addresses under one account. That matters a lot in San Diego County, where fire evacuations are frequently neighborhood-specific, and where the difference between a Watch, a Warning, and an Evacuation Order can mean very different instructions for streets just blocks apart.
Registration is free. The county's registration portal asks for your name, address, and contact methods - phone, cell, and email are all options. You can specify which types of incidents you want to be notified about, though for most residents, leaving all alert categories enabled is the practical choice.
How to Actually Sign Up
Go to the AlertSanDiego registration page, which is accessible through the county's Office of Emergency Services website at readysandiego.org. That site is the county's official public-facing emergency preparedness hub and links directly to the registration portal. You'll create an account or log in if you've registered before, then enter your address or addresses and your preferred contact information. The process takes a few minutes.
If you've moved recently, it's worth logging back in to update your address - the system won't automatically follow you. Same if you've changed your cell number. Outdated registrations are one of the most common reasons people miss alerts that were actually sent for their area.
For residents who speak languages other than English, the county's emergency communications include Spanish-language notifications, and readysandiego.org has multilingual information. If you have a neighbor who is elderly, doesn't use a cell phone, or relies on a landline, their address may already be in the system through that landline database, but walking them through the registration process adds a redundant layer that's worth the few minutes.
What the Different Alert Levels Mean in San Diego County
San Diego County uses three tiers for fire and other evacuation-related emergencies, and the names are more intuitive than the older color-coded systems some counties use. An Evacuation Warning means conditions in your area pose a potential threat and you should prepare to leave - it's the moment to gather documents, medications, pets, and your go-bag. An Evacuation Order means leave now, and re-entry is restricted until officials lift it. A Shelter-in-Place order means the opposite: stay inside with windows and doors closed, usually because of a hazardous materials situation or air quality emergency. AlertSanDiego notifications will specify which tier applies and, when possible, will define the geographic boundaries by street name or zone.
See also: How Alpine County Residents Can Sign Up for Emergency and Wildfire Alerts · How to Sign Up for Sierra County Emergency Alerts and What to Expect When a Warning Goes Out
The county also posts real-time evacuation maps and zone information at sdcounty.ca.gov during active emergencies, and the county's Office of Emergency Services maintains social media accounts that push updates during incidents. Those channels supplement but don't replace direct alerts, since social media requires you to be actively checking it.
Other Notification Systems Worth Knowing About
AlertSanDiego handles county-level emergencies, but some cities within the county operate additional local systems. The city of San Diego, for instance, also uses AlertSanDiego as its platform, so registration through the county portal covers both. Smaller incorporated cities may have their own supplemental notification tools; check with your specific city if you live in one of the county's incorporated municipalities and want to confirm what's in place locally.
San Diego Gas and Electric also runs a separate notification system for Public Safety Power Shutoffs - planned outages the utility initiates during high fire-risk conditions. That registration is through SDG&E directly at sdge.com and is separate from AlertSanDiego. Both are worth having if you live in a fire-prone part of the county.
This is general information, not legal or emergency-management advice. Alert systems and registration processes can change; verify current sign-up steps and alert zone information with the San Diego County Office of Emergency Services at readysandiego.org or sdcounty.ca.gov/oes.