I was told its not correct that they are dmr. Still working on finding out for sure. Why they would be nxdn when everyone else around them are dmr or conventional is beyond me.
According to their license, WPPY555, they are licensed for NXDN, but not for DMR.
FCC Callsign WPPY555 (UNION CITY, TOWN OF)
www.radioreference.com
It's possible that, if they chose NXDN instead of DMR like their 'neighbors', they wanted to have a system that was less likely to be monitored.
Which scanner do you have? You should be able to program the frequency as DMR, and set it for 'search' to find what color code is in use, if they actually ore DMR, which they are not licensed to use.