Are you willing and pysically able to do fire if so I know Riverside Co is expecting to start taking reserve applications in July not sure yet of how they utilize their reserve people or how much they would be treating patients. San Bernardino county seems to always be looking for paid call people. OCFA also if I remember correctly runs a reserve program and of course you have a hand full of departments that utilize AO's which would limit your exposure to the fire line if that concearns you.
You could also give the forums over at firehouse.com a try they have a state specific forum for Cali,even if your not interested in fire you could probably find some useful information.