Washtenaw County Fire & EMS Frequencies

This page lists the fire-service and EMS radio frequencies on file for Washtenaw County, Michigan, with the county seat at Ann Arbor and a local ZIP prefix that begins with 481xx. Whether you are a resident programming a new handheld scanner, a journalist chasing a working fire, a neighboring department monitoring mutual-aid traffic, or a ham operator on AUXCOMM duty, this is your starting point for the channels you actually need.

Dispatch traffic in the county moves on a small set of repeated channels: a primary fire dispatch repeater that carries the initial alarm, a fireground tactical channel that the assignment moves to once units arrive on scene, an EMS dispatch channel for ambulance assignments, and an EMS-to-hospital med channel where medics give entry notifications and consult medical control. Larger incidents — a working fire requiring mutual aid, a multi-vehicle highway crash with extrication, a wildland fire spreading into neighboring jurisdictions — escalate to the statewide channels documented on the Michigan page.

Radio traffic in Washtenaw County runs hot for an urban jurisdiction. Expect tightly packed dispatch, automatic-aid box alarms that pull engines from neighboring stations on the first round, and short, deliberate fireground transmissions because the channel rarely sits idle for long. Truck companies, engines, and command move quickly between dispatch and tac channels — the moment an assignment is delivered, units are encouraged to switch off the dispatch repeater so the next alarm can land on it without delay. Listening here you'll hear repeating patterns: structure-fire box alarms in the dense neighborhoods around Ann Arbor, EMS calls that share apparatus with fire (and therefore overlap on the air), and frequent mutual-aid moves to and from adjacent jurisdictions.

Most Washtenaw County departments have either fully migrated to the Michigan statewide trunked system or run hybrid plans where the conventional VHF or UHF channel is retained as a fallback. If you are programming a scanner and the agency has migrated to a trunked system, watch for the agency's talkgroup on the system rather than the historical conventional repeater, which may carry only fireground or cross-jurisdictional traffic now. The mutual-aid escalation path almost always lands on MPSCS before reaching the nationwide NIFOG bank.

The local agencies and the channels they typically run are listed below. From each agency page you can pull a deeper view of that department's individual fireground, tac, and EMS-side channels — useful when you want to monitor only one department rather than the whole county.