Looks like Union county is on N.C. Viper. Check here-
https://www.radioreference.com/apps/db/?sid=7118. It shows 3 sites for Union Co.and these talkgroups-
45500 b1bc D UNIONCOM Union County Common Multi-Talk
45501 b1bd D UNIONEM Union County Emergency Management Multi-Talk
45502 b1be D UNIONEMS Union County EMS EMS Dispatch
45503 b1bf D UNIONEMSALER Union County EMS Alert EMS Dispatch
45504 b1c0 D UNIONFDALERT Union County Fire Dept Alert Fire Dispatch
45505 b1c1 D UNIONFIRE Union County Fire Fire Dispatch
45506 b1c2 D UNIONMAID Union County Mutual Aid Interop
45507 b1c3 D UNIONSO Union County Sheriff Law Dispatch
45508 b1c4 D UNIONSOCID Union County Sheriff CID Law Tac
45509 b1c5 D UNIONSONARC Union County Sheriff NARC Law Tac
45510 b1c6 D UNIONTAC Union County TAC Multi-Tac
45511 b1c7 D UNIONTAC2 Union County TAC 2 Multi-Tac
45512 b1c8 D UNIONTAC3 Union County TAC 3 Multi-Tac
45513 b1c9 D UNIONTAC4 Union County TAC 4 Multi-Tac
45514 b1ca D UNIONTAC5 Union County TAC 5 Multi-Tac
45515 b1cb D UNIONTAC6 Union County TAC 6 Multi-Tac
45525 b1d5 D MONROFDADMN Monroe FD Admin Fire-Talk
45526 b1d6 D MONROFDALERT Monroe FD Alert Fire Dispatch
45527 b1d7 D MONROFDDISP Monroe FD Dispatch Fire Dispatch
45528 b1d8 D MONROPDDISP Monroe PD Dispatch Law Dispatch