Certain Utah drunk driving penalties apply when you get convicted or plead guilty under dui charges. The state of Utah has enacted zero tolerance policy for under-21 drivers. While in other states, the permissible BAC limit for under-21 drivers is 0.02, Utah do not permit a single drop of alcohol. It means even if the BAC level is 0.001, an under-21 driver can be arrested on dui charges. For other drivers, the BAC limit is still 0.08 (for commercial drivers, it is 0.04).