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AlertSF is a text-based notification system for San Francisco's residents and visitors.

AlertSF will send alerts regarding emergencies disrupting vehicular/pedestrian traffic, watches and warnings for tsunamis, flooding, and Citywide post-disaster information to your registered wireless devices and email accounts. Registrants can also sign up to receive English-language automated information feeds and/or alerts targeted to specific areas of the City.

Registration for AlertSF is free. Text message charges may apply depending on your wireless carrier and plan. These charges will not be reimbursed by the City and County of San Francisco. When registering your cellular device, make sure it is capable of receiving email generated text messages.