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Emergency Alert and Notification

The primary tool to notify the public is an Outdoor Warning Siren System placed at various locations in the 10-mile Emergency Planning Zone. Upon activation, the sirens will sound for approximately three minutes with a steady, high-pitched sound. Residents should turn on radios or televisions to receive Emergency Alert System (EAS) warning messages. County officials use the Emergency Alert System to provide emergency information and instructions. EAS stations are listed below:

  • KTAR 620 (AM) and 92.3 (FM)
  • KMVP 98.7 (FM)
  • Phoenix National Weather Service forecast office transmits via the National Oceanic and Atmospheric Administration (NOAA) Weather Radio South Mountain transmitter, KEC 94 (FM) on 162.55 Mhz.

All radio and television stations serving the affected area(s) will be asked to broadcast emergency information as a public service.

Should a siren(s) fail the Maricopa County Sheriff's Office will provide warning by telephone, door to-door contact or loudspeakers mounted on patrol or other vehicles as necessary.


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Maricopa County presents this information as a service to the public. It has made every effort to ensure that the information contained here is accurate. It makes no warranties or guarantees, nor may anyone assume any warranties or guarantees regarding the accuracy or reliability of its content or of other information to which there is a link. Assessing accuracy and reliability of information is the sole responsibility of the user. Maricopa County shall not be liable for errors contained here or for any damages in connection with the use of the information contained here. Maricopa County does not endorse the content found on non-Maricopa County websites accessed via hyperlink. Further, the e-mail address and any other information found here shall not be used for unsolicited advertising, marketing, or other commercial purposes.
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