Members of the public and business are encouraged to register themselves on the alerts.dc.police.uk website by providing their name, address, email address and other contact details.
They can specify which times of the day they wish to receive a message and which categories would be of interest.
There are numerous categories and interests to choose from. For example, watch schemes, education, community safety and flood warnings.
If they are unable to register online, they can fill in a registration form (print and email version) and return it to the DC Alert officers, who will manually add them to the system.
More information can be found on the Force website or on alerts.dc.police.uk.