What you were hearing was likely "The Hill" - AKA Radio Center, AKA Monroe County Public Safety Communications. They're the organization that maintains the comms infrastructure for the County agencies. They have their own radio freqs, and I believe that may be one of them. They have the ability to run clear, encrypted, and IMBE on those freqs.
Last I knew, the Haz Mat team ran encrypted on VHF. That was a while ago, so I could be wrong.
Also, last I knew, they were going to reuse the existing frequencies for the new digital radio system. It should just be a matter of installing the new mobile and portable units and 'flipping the switch' as the existing repeater infrastructure already has the ability to support digital comms.