Fire in Maricopa County is generally not an issue with most agencies under Regional Wireless Cooperative [founded by Phoenix], others under Topaz Wireless [founded by Mesa], some Rural Metro and a tiny handful of volly FDs [Wittman VFD]. RWC K-Deck four is encrypted, but that is used mostly for police shootings and agency assist for tactical operations.
Police? I used to be one in the Metro area and have no interest in listening to it now. Someone else can probably help with current operations in that venue.
There is no Statewide FD, short of wildland operations and it is a joint venture by State and Feds, depending on locations and resources.
This is the website to what some here call "The Big Board" [an irreverent tribute to Dr. Strangelove and George C. Scott]. It shows general FD calls in much of Maricopa County [EMS calls are excluded, ops involving the police, and some other calls are not shown]. See link:
ArcGIS Dashboards [Agency and units are available via the link at the top of the page. Printing it as a reference is a good idea until you get familiar with the units].
Phoenix FD publishes their operations orders online and you can find out about aircraft operations, HAZMAT, EMS, commercial operations, etc.
If you have a relatively modern Windows or Mac computer, you can download Sentinel and program your BCD/SDS scanner yourself.