PJH,
Waterford is the system used by Waterford and New London. They added East Lyme in for future use. I believe the chiefs and Marshals have portables, but no one else. East Lyme fire is dispatched by East Lyme, police by the State Police and these calls are not talk-around conversations, they are dispatch calls for medical, MVA, report of smoke, nothing mutual aid.
I completely understand how regional systems work, but East Lyme and Waterford are both clear that the talk groups are for future use only. East Lyme, Waterford and New London are considering combining dispatch centers, but that is a long way off. These calls are dispatched often in clusters, there no mutual aid component and L&M Medics are dispatched on their own VHF frequency, although they also pop up at times on the Waterford 800 system under their own talk-group. If it happened regularly that would be one thing, but they are not, which is why i am curious if anyone has first hand knowledge of the rhyme or reason, if one exists, why these transmissions exist on that system.