I have looked there (before asking) and did not find the district listed. I know they use the regional system. I just do not see the district listed. they are still lisenced on the Sac County Primary Fire channel like Wilton and the other southern districts. Does their district use the metro tg's?
FIRE A groups primarily in their district and surrounding fire districts when on mutual aid incidents. Unless it's a city of Sacramento inciicent then it will be Fire B group. Best bet put Fire A, B and maybe C although C rarely gets used except on extremely busy incident days. Cosumnes Fire is Battalion 10 (BC-10), and has stations 71, 72, 73, 74, 75, 76 with the respective apparatus numbers assigned to them (engine 71, truck 74, engine 373, etc.). 78 as well although no apparatus assigned, only used when units are at training facility off of Grant Line/East Stockton.
Battalion 37 is also Cosumnes fire for the Galt area and has 45 and 46 although no BC-37 (uses BC-10 primarily).
Cosumnes Fire and Elk Grove PD are my primary listens.