A DUI in California can cost you upwards of $10,000 when all is said and done. The base fine for a first offense DUI is $390, but that doesn't include things like towing fees, license reinstatement fees, alcohol education classes, and other mandatory penalties. If your blood alcohol content was above .08% or if you refused to submit to a chemical test, you'll also be facing mandatory minimum penalties that can add hundreds or even thousands of dollars to your overall costs. And if you caused an accident or injured someone while driving under the influence, you could be facing much higher fines, jail time, and other serious penalties. In short, a DUI in California is not a cheap proposition.