Reverse 911

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Reverse 911 is a public safety communications system developed by Cassidian Communications, formerly PlantCML, a unit of Airbus Group, Inc.[1][2] It is used by public safety organizations in Canada and the United States to communicate with groups of people in a defined geographic area. The system uses a database of telephone numbers and associated addresses, which, when tied into geographic information systems (GIS), can be used to deliver recorded emergency notifications to a selected set of telephone service subscribers.[3]

Case studies

The system is used to notify residents in emergency situations. During the 2010 Boston water emergency, government agencies used the system to notify a large number of Boston-area residents in particular neighborhoods to boil water before drinking.[4] During the much more contained 2004 bulldozer rampage in Granby, Colorado, authorities used Reverse 911 to notify the approximately 1,500 residents of the town to evacuate from the bulldozer's path.[5] During the 2011 Tōhoku earthquake and tsunami, Seaside and Astoria, Oregon, residents were notified by Reverse 911 and sirens to evacuate low-lying areas.[6] When the improvised explosive devices in the Aurora, Colorado, apartment of 2012 Aurora shooting gunman James Holmes were detonated by police, Reverse 911 was used to notify nearby residents of the evacuation order.[7] On December 14, 2012, Reverse 911 was used to notify parents in the Sandy Hook community of Newtown, Connecticut, of the Sandy Hook Elementary School shooting incident.[8] During the manhunt for suspects involved in the Boston Marathon bombings, Reverse 911 was used to notify residents of Watertown, Massachusetts, to remain in their homes.[9] In October 2014, some Dallas, Texas, residents were notified of the city's second Ebola infection case by a Reverse 911 call.[10]


  1. Pierceall, Kimberly (February 17, 2010). "911 products to take on Temecula firm's brand". The Press-Enterprise. Retrieved June 8, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. Jackson, Donny (June 1, 2008). "EADS buys PlantCML". Urgent Communications. Retrieved June 8, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "What is Reverse 911?" (PDF). Retrieved April 10, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Henry, Derrick (May 2, 2010). "Ruptured Pipe Cuts Water in Boston". The New York Times. Retrieved November 18, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. "Bulldozer rampage gunman dead". June 5, 2004. Retrieved November 18, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. Mungeam, Frank (March 11, 2011). "Tsunami causes evacuations, damage at Ore. coast". Retrieved March 17, 2011.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. Aurora Police Department (July 21, 2012). "UPDATE: Peoria Street CLOSED..." Retrieved July 29, 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. Stoller, Gary; Strauss, Gary; Stanglin, Doug (December 14, 2012). "Gunman kills mom, 26 others in school shooting spree". USA Today. Archived from the original on December 14, 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. Kumar, Nikhil (April 19, 2013). "Boston Marathon bombing: How critically injured man's memory of 'man in the white cap' gave FBI vital clue". The Independent. Retrieved April 19, 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  10. Fantz, Ashley; Yan, Holly (October 13, 2014). "Questions remain about how Dallas nurse got Ebola". Retrieved October 13, 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>