DAS/In-Building Coverage Overview

There are over 700 properties in King County that have public safety Distributed Antenna Systems (DAS) that rebroadcast the emergency radio system within their properties to support first responders. Public safety DAS is needed because the size, building materials, design elements, or other aspects of a property could impact emergency radio communications. Properties with DAS in King County tend to have been built in the last ten years, are greater than 100,000 square feet, and/or use energy-efficient insulation, such as mixed-use residential buildings, tall office buildings, schools, hospitals, and corporate campuses. In 2022 – 2023, first responders in King County began using PSERN and with this change, properties with public safety DAS are legally required to take action to remain compliant. Properties with public safety DAS have been contacted directly to guide them through this change, but more information can be found here:

If you have any questions regarding DAS/In-Building Coverage or if you need to update property contact information, please contact the DAS Coordinator, Creighton Watley, at das@psern.org.