In most of the larger incorporated areas of the state such as Sacramento, the fire departments have taken over 911 ambulance services. Primarily (and sadly) because of the amount of revenue the departments can pull in from a single transport. However, in Sacramento there are some AMR units still providing 911 ALS ambulance service to the county because of prior contracts with the county of Sacramento. These ambulances (AMR 23 and 54 to name two) post within the area of those fire stations, and the crew of these ambulances live out of that ambulance for the duration of their shift. Other areas such as in Stockton have contracted with private ambulance companies to provide 911 ambulance services.
The private ambulance companies provide inter-facility transports, to and from transports, and most of the time even wheelchair vans and other non-emergency services. These ambulances are all code 3 equipped in case their patient happens to go down hill in the middle of a transport. There are BLS, ALS, and CCT ambulances. BLS would consist of a crew of only EMT's. ALS would be atleast one paramedic, and CCT (critical care transport) would have atleast a paramedic and a nurse or doctor).
These companies also provide "medical stand-by's" at high school football games and other sporting events, however in Sacramento County, they could only provide care until the first in FD operated ambulance showed up on scene to transport.
Anyone can call a private ambulance company to give them a ride to the hospital, or for an inter-facility transport, however it has to be non-emergency. If it is an emergency the person would be instructed to call 911