All residents/businesses are encouraged to sign up for AlertOC.

AlertOC is a mass notification system designed to keep Costa Mesa and Orange County residents and businesses informed of emergencies and certain community events.

By registering with AlertOC, time-sensitive voice messages from the County or City in which you live or work may be sent to your home, cell or business phone.

Text messages may also be sent to cell phones, e-mail accounts and hearing impaired devices.

AlertOC is operated by the County of Orange in collaboration with local cities.

To register go to: www.alertoc.com