Before Palmetto 800 switched to full P25 in 2017, they were big users of Palmetto 800. They have now switched to a new system that has not yet been identified.
When I was at the coast last week, I noted a DMR control channel on a frequency licensed to SCANA Services, Inc. Search the FCC database for FRN #0010037752. As an example, WQBG831 is a callsign for a sight in Gaston, Lexington Co. I suspect this is a new DMR system that they are using now.
If you can gather any data regarding the system type and system ID, I can work to add it to the database.
There is also this thread from earlier:
https://forums.radioreference.com/south-carolina-radio-discussion-forum/361077-sce-g-where-you.html