What can happen if I am driving intoxicated and wreck injuring 3 passengers and myself?

You turn the claims over to your carrier and hopefully get them out of the way of the criminal process so they wont put pressure on the DA. If this is your first offense you will pay a fine and court costs, several hundred dollars and you will lose your license for a year. your insurance will go sky high If you have a chance to beat it, hire you the best traffic court lawyer in town. He might win your case on some technicality and if not he might get you a limited driving permit so you can drive to work.

The charges you might face depend on specific facts and on the jurisdiction. Most states make it a crime to drive under the influence and thereby cause personal injury to people. Each has different penalties, but none would let you off very easily. You should very promptly consult a criminal lawyer in your jurisdiction.

In South Carolina the charge would be felony DUI. I do not know the sentence off the top of my head but I believe you can get up to 10 years if it is serious injury.