CountyWide Integrated Radio System (CWIRS)

header-title-decorationCountyWide Integrated Radio System (CWIRS)

CountyWide Integrated Radio System (CWIRS) – LA County Departments only


The County of Los Angeles operates an 800 MHz, trunked, simulcast radio system. With the exception of the county fire department and the Sheriff, all county departments participate. To communicate with Fire and Sheriff, there exists a bridging interface. In the event of a declared emergency Los Angeles County departments can communicate with each other and free up the other communication channels.

Emergency Medical Services coordinates CWIRS for the Health Services. In addition to training on the use of the radio, EMS coordinates maintenance and repair of all end user equipment and maintains an inventory of all issued radios. EMS conducts a bi-annual inventory of all CWIRS Radios. Everyone who is issued a portable radio and Facility Representatives who oversee the hospital base radios must complete a Radio Inventory Form. Facilities must also update the CWIRS Directory each time a radio changes hands. Failure to update the biannual inventory may cause disruption of service and a reactivation fee.

On the second Thursday of each month EMS conducts a CWIRS roll call of selected Department of Health Service radios. The goal of the test are to:

  • Test the radios at Emergency Medical Services Headquarters.
  • Verify end user radio equipment.
  • Validate that the users know how to use their radios.
  • Provide end users radio “air” time.

Additional Information

CWIRS End User Training Manual 2015
CWIRS Inventory Form
CWIRS Directory by Last Name
CWIRS Directory by Assignment
CWIRS Directory by LID