Probably only the very large, advanced cities like Boldhome, Nochet, Pavis, and most Lunar cities would have a permanent, organized fire department. In areas where sorcery is practiced, like the empire, I bet that there's probably a few minor ones kept on call with water or rain spells. Cities like Pavis or Nochet which are by large bodies of water probably employ water email, and in Boldhome they may use rain or storm magic.