The Regional Municipality of Durham

Public Service Announcement

Region of Durham testing Public Alerting System

WHITBY, ON October 10, 2017

Residents and businesses are advised that the Region of Durham will be conducting its annual fall testing of the Public Alerting System within the 10-kilometre area around the Darlington and Pickering Nuclear Generating stations.


Testing is scheduled to take place during regular daytime business hours on October 24 for indoor notification (automated emergency telephone dialing system), and on October 25 for outdoor siren activation. The outdoor sirens will sound for up to one minute.


The Public Alerting System is in place for the 10-kilometre area around the Darlington and Pickering Nuclear Generating stations. 


The Public Alerting System is designed to warn residents and businesses in the unlikely event of a nuclear emergency. It consists of two components—outdoor sirens installed within three kilometres of the nuclear generating station, and an automated emergency telephone dialing system for indoor notification within the 10-kilometre area. Households and businesses with a landline in this area, which includes the City of Oshawa and towns of Ajax and Whitby, will receive the indoor notification.

Testing of the Public Alerting System satisfies provincial requirements. It helps to ensure operation of the system, while increasing public awareness.  


Individuals near the Darlington or Pickering Nuclear Generating Station, who hear sirens or receive the indoor notification, are not required to take any action. This is only a test of the Public Alerting System.

The next testing is scheduled to occur in spring 2018.

For more information, please visit, or contact the Public Alerting Information Line at 1-866-551-5373.

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For more information, please contact Corporate Communications.