There are 2 kinds of permits: A Class 12 Permit or Mixologist’s Permit is required to work behind the bar, mix drinks, pour tap beer or wine, or manage an establishment which serves alcohol for on premise consumption. A Class 12 permit holder may act solely as a server. You must be at least 21 years of age to possess a class 12 permit or alcohol permit in Washington. A Class 13 Permit or Server’s Permit will allow you to take orders for and deliver alcoholic beverages for on site consumption. A server may open and pour beer or wine into a glass at a customer’s table, but may not mix or pour from a tap, or manage a facility which serves alcohol for on site consumption. A server must be at least 18, 19 or 20 years of age.