Several of the towns within the county have "Parks" talkgroups listed on the Viper system talkgroup list. That would be the first place I'd expect to find a comparable county agency.
A visit to a county-run park, where you might see someone with a radio (and antenna), might confirm or rule out the presumption.
If they are on Viper, you will need to monitor them as a trunked system on your scanner.