Phoenix Police Scanner Deep Dive: A Valley Divided
The Phoenix metro area—home to 4.5 million people—is split down the middle. America's 5th largest city and the nation's 4th largest sheriff's department both still run dispatch in the clear, alongside open fire and highway patrol traffic. But the East Valley suburbs—Mesa, Tempe, Scottsdale—have fully encrypted, and the openness that remains in the core is one council vote away from disappearing.
Phoenix Metro: A Region Split in Two
The combined Phoenix metro is one of America's fastest-growing regions. Its core agencies still broadcast dispatch in the clear—but its suburbs show how quickly that can end.
Understanding Phoenix's System: The RWC
Phoenix and about 19 member agencies operate on the Regional Wireless Cooperative (RWC), a Phoenix-operated 700 MHz P25 trunked radio system with 7 simulcast cells, currently migrating from Phase I to Phase II. It is a separate network from TOPAZ — the TOPAZ Regional Wireless Cooperative (TRWC) is the Mesa-operated East Valley system serving Mesa, Gilbert, Apache Junction, and Queen Creek. The structure of the RWC determines exactly what you can and can't hear.
RWC Simulcast System
The Regional Wireless Cooperative is a P25 digital trunked system covering the Phoenix metro. Multiple agencies share the infrastructure, each with their own talkgroups. Heavy simulcast means you'll want an SDS-class scanner—see our Phoenix scanner guide.
"A" Talkgroups: Precinct Dispatch (In the Clear)
Phoenix PD precinct dispatch talkgroups remain in the clear on the RWC. Every precinct's primary dispatch channel is open—this is substantial, ongoing access, carried live on Broadcastify feed 12145.
"B"/"C" Talkgroups: Encrypted
Major incident and operations traffic moves to the "B" and "C" talkgroups, which are encrypted. When significant incidents occur, communication shifts to channels unavailable to the public.
Tactical/Chase/Detective: Encrypted
Hot pursuit, tactical operations, and detective communications are encrypted across most Phoenix-area agencies. The most newsworthy police activity is invisible.
The Dispatch Exception
Phoenix PD keeps precinct dispatch in the clear on the "A" talkgroups. But when a serious call comes in, radio traffic moves to encrypted channels. Scanner listeners hear the routine calls and go silent on everything that escalates—open dispatch with an encrypted ceiling.
Maricopa County: The 4th Largest Sheriff Keeps Dispatch Open
The Maricopa County Sheriff's Office is the fourth largest sheriff's department in the country. Its dispatch remains publicly monitorable across a massive unincorporated area—a major piece of transparency worth protecting.
Scale of Coverage
MCSO serves over 4 million residents across 9,224 square miles—an area larger than New Jersey. The sheriff patrols unincorporated communities, provides contract policing, and handles county facilities.
Dispatch in the Clear
MCSO district dispatch talkgroups (1000-1009) are in the clear on the Maricopa County P25 system. Tactical and investigative channels are restricted, but day-to-day district traffic remains publicly monitorable.
Federal oversight history
MCSO has faced federal civil rights investigations spanning more than a decade. Open dispatch is one of the few remaining layers of independent public monitoring for a department with a documented accountability record—and a key reason to oppose any move toward full encryption.
Public Crime Mapping
MCSO partnered with BAIR Analytics to provide RAIDS Online crime mapping—but delayed, processed data is no substitute for real-time scanner awareness.
Phoenix Metro Agency Encryption Status
The metro splits cleanly: core agencies keep dispatch open while the East Valley has gone fully dark.
| Agency | Status | Population | Notes |
|---|---|---|---|
| Phoenix Police Department | Partial | 1.6M | Precinct ("A") dispatch in the clear on RWC; tactical/chase/ops encrypted |
| Maricopa County Sheriff | Partial | 4.5M | Nation's 4th largest sheriff; district dispatch 1000-1009 in the clear, tactical restricted |
| Arizona DPS (State Patrol) | Open | Statewide | Highway patrol dispatch in the clear; analog UHF multicast with AZWINS |
| Mesa Police Department | Encrypted | 510K | Fully encrypted ~2023 on the Mesa-run TOPAZ (TRWC) system |
| Chandler Police Department | Partial | 280K | East Valley; dispatch in the clear, tactical encrypted |
| Gilbert Police Department | Partial | 270K | Fast-growing suburb; mostly encrypted, emergency traffic in the clear |
| Scottsdale Police Department | Encrypted | 250K | Resort city; fully encrypted January 2024 |
| Tempe Police Department | Encrypted | 185K | ASU area; fully encrypted April 2023 |
| Glendale Police Department | Partial | 250K | West Valley; mixed — some traffic clear, some encrypted |
| Phoenix Fire Department | Open | 1.6M | Regional dispatch for ~20 Valley departments in the clear; only K-4/SWAT-support encrypted |
El Mirage PD, Goodyear PD, Buckeye PD, Avondale PD, Peoria PD, Queen Creek PD, Pinal County Sheriff, and multiple tribal police departments have also gone encrypted, and Surprise PD is mostly dark.
Tucson: Southern Arizona Mirrors the Phoenix Core
Arizona's second largest city allows partial monitoring, much like Phoenix proper. The real contrast is between the dispatch-open cities and the fully encrypted East Valley.
East Valley (Fully Encrypted)
- Mesa PD fully encrypted (~2023)
- Tempe PD fully encrypted (April 2023)
- Scottsdale PD fully encrypted (January 2024)
- Queen Creek, El Mirage, Pinal County dark
- Over a million residents with no scanner access
Phoenix Core & Tucson (Dispatch Open)
- Phoenix PD precinct dispatch in the clear
- MCSO district dispatch in the clear
- AZ DPS Highway Patrol dispatch open
- Tucson PD and Pima County partial access
- Phoenix Fire regional dispatch open
Phoenix, MCSO, and Tucson prove every day that open dispatch coexists with officer safety. The East Valley chose darkness anyway.
Arizona Encryption Timeline
Impact on Phoenix Communities
Arizona Republic & local media
Phoenix newsrooms can still monitor precinct dispatch and MCSO district traffic in real time — a working model other metros have abandoned. But major incidents shift to encrypted talkgroups, and in Mesa, Tempe, and Scottsdale reporters get nothing at all.
Extreme heat emergencies
Phoenix sees deadly heat waves every year. Because Phoenix Fire's regional dispatch stays in the clear, residents and reporters can still track EMS responses during heat events — exactly the kind of access full encryption would erase.
Wildfire coordination
Arizona has significant wildfire exposure. Fire channels are mostly open, but law enforcement tactical coordination during evacuations moves to encrypted talkgroups — a gap that grows with every agency that fully encrypts.
New residents with no baseline
The metro keeps adding population. Newcomers in Mesa, Tempe, or Scottsdale have never had scanner access and have no reference point for what their neighbors in Phoenix proper can still hear.
Sports and large events
Phoenix hosts Super Bowls, the Final Four, and other major events. Security communications at State Farm Stadium, Chase Field, and other venues are encrypted.
Federal coordination
Phoenix-area agencies routinely coordinate with federal law enforcement on border and immigration operations. None of that coordination is visible to the public.
What Remains Accessible
A substantial amount of Phoenix-area traffic is still in the clear. The metro's P25 Phase II trunking and heavy simulcast mean a capable scanner matters — our Phoenix scanner buying guide covers what actually works here.
Phoenix PD precinct dispatch
Precinct ("A") dispatch talkgroups on the RWC are in the clear, carried live on Broadcastify feed 12145. Major incidents move to encrypted "B"/"C" talkgroups, but day-to-day dispatch across every precinct is open.
MCSO district dispatch
Maricopa County Sheriff district dispatch talkgroups 1000-1009 are in the clear on the county P25 system — public monitoring across 9,224 square miles of patrol area.
Phoenix Fire Department
Phoenix Fire runs regional dispatch for roughly 20 Valley fire departments in the clear. Only K-4 (VIP visits, SWAT support) is encrypted. Fire and EMS monitoring remains possible across most of the metro.
AZ DPS, Chandler, and Gilbert
DPS Highway Patrol dispatch is in the clear on analog UHF (multicast with AZWINS) — even analog scanners receive it. Chandler PD dispatch is open with tactical encrypted, and Gilbert keeps emergency traffic in the clear.
Broadcastify feeds
Scanner enthusiasts maintain Broadcastify feeds covering Phoenix PD, MCSO, and fire dispatch. One Maricopa County Sheriff feed operator notes they "reserve the right to disable channels for officer safety" — a reminder that even this access isn't guaranteed.
What Arizonans Can Do
- Phoenix PD dispatch, MCSO district dispatch, DPS, and fire communications are still accessible. Use these feeds and document incidents where open access makes a difference — those examples are your best advocacy material.
- Phoenix, MCSO, Tucson, and Pima County all run open or partially open dispatch today. They're the counterexample Arizona lawmakers need to see when East Valley departments claim encryption is inevitable.
- Flagstaff and rural counties are still open. If you're in those communities, engage local officials now, before encryption proposals appear on the agenda.
- Arizona has no state law requiring radio access. Push your state representatives for legislation requiring public process before any agency encrypts.
- Phoenix, Mesa, and other city councils set police policy. Public comment periods are real — show up and make the case.
- Arizona public records laws cover radio communications. Request documentation of encryption decisions and any internal cost-benefit analyses.
- Subscribe to outlets doing police accountability work. When scanner access is gone, investigative journalism is the fallback, and it needs support to function.
- Document specific incidents where encryption delayed public information. Concrete examples move legislators faster than abstract arguments.
Take Action for Transparency
Your voice matters. Here are concrete ways to advocate for open police communications in your community.
Contact Your Representatives
Use our templates to email your local officials about police radio encryption policies.
Get StartedRead Case Studies
See how encryption has affected real communities - from Highland Park to Chicago.
View CasesSpread Awareness
Share evidence about police radio encryption with your network and community.
Public Testimony
Learn how to speak effectively at city council and public safety meetings.
Prepare to SpeakRelated Resources
Sources & Further Reading
- RadioReference.com: Maricopa County, Arizona scanner frequencies and encryption status
- RadioReference Forums: "Encryption in the Phoenix AZ area" community discussions
- Broadcastify: Phoenix Metro Public Safety live audio feeds
- Maricopa County Sheriff's Office: RAIDS Online public crime mapping
- Regional Wireless Cooperative (RWC) system documentation
- Arizona Department of Public Safety encryption announcements
- Phoenix Police Department communications policies