Richard's answers are usually spot on, but I am afraid he missed the mark on this one. State law governs the POSSESSION of firearms, but local government can, and does, regulate where firearms can be discharged. Within city limits, state law says it is illegal to possess a loaded firearm in public, and most cities have regulations concerning whether firearms can be discharged in private places (restricting it to gun ranges, etc.).
State law does not prohibit possessing a loaded firearm outside of city limits UNLESS shooting has been restricted in such areas by the county. For example, Los Angeles County has many districts within which shooting is prohibited, and where it is consequently illegal to possess a loaded firearm.
My search of the El Dorado County Code (which is applicable only outside city limits) shows that shooting is restricted in the Lake Valley area (outside of a range you can only fire a shotgun with small caliber ammo--EDCC 9.44.060). You cannot shoot in or across a park. (EDCC 9.46.240.) You cannot shoot within 500 feet of an airport except at a range. (EDCC 9.44.050.) There do not appear to be any other general restrictions upon shooting, except that you cannot shoot over private land without the consent of the landowner (EDCC 9.44.040), and you cannot shoot from a boat or across a lake or reservoir, except for use of a shotgun to hunt waterfowl (EDCC 12.60.040).
Bottom line: as far as I can tell, so long as you are not within city limits or in the Lake Valley area, you should be able to discharge your firearm on your property. I would suggest checking with the local Sheriff to be sure.